Top 60 Companies at the Forefront of Smart Grid Technology (2024 Patent Data)

Smart grid technology is rapidly evolving, driven by the urgent need for cleaner, more efficient, and resilient energy systems. The convergence of renewable energy sources, digital technologies, and advanced analytics is ushering in a new era of power management.

This report delves into the intellectual property landscape of smart grid technology, examining the patents held by industry leaders who are at the forefront of innovation. By analyzing these patents, we gain insights into the latest developments in areas such as:

  • Microgrid technologies: As seen in patents held by Bloom Energy, the ability to operate independently from the main grid is becoming increasingly crucial for ensuring power reliability and resilience.
  • Renewable energy integration: Companies like SMA Solar and Huawei are leading the charge in developing technologies to optimize the integration of solar and wind power into the grid.
  • Energy storage solutions: The efficient storage of renewable energy is a key challenge. Patents from various companies are exploring innovative approaches to address this issue.

This report serves as a roadmap for navigating the complex landscape of smart grid innovation. Let’s dive in! 

#1 BLOOM ENERGY CORPORATION

Headquarters: San Jose, California, USA

Bloom Energy is a leader in providing innovative, clean, and reliable energy solutions using fuel cell technology. The company focuses on helping organizations reduce their carbon footprint and achieve energy independence.

Key Patents in Smart Grid Technology

Managing power output from fuel cell systems in microgrid applications (US20210152016A1)

Managing power output from fuel cell systems in microgrid applications to address degradation of fuel cell power supplies. The technique involves connecting multiple fuel cell clusters in parallel to a common bus, using bidirectional DC-DC converters between each cluster and the bus. This allows load balancing and power transfer between clusters as fuel cell degradation occurs. The converters can shift electrical power output from a degraded cluster to another cluster to maintain overall power output.

Managing fuel cell microgrid power systems (US11258294B2)

Managing fuel cell microgrid power systems to address degradation of fuel cell microgrid power supply. The method involves connecting the fuel cell modules in parallel using bidirectional DC/DC converters instead of master-slave architecture. This allows flexibility in allocating power between modules as degradation occurs. The converters shift power from degraded modules to healthy ones to maintain overall system output. The converters are connected in parallel to a central bus, or in a ring configuration. This allows automatic or manual power transfer between modules as needed. The converters can also compensate for reduced power output from degraded sources. This reduces redundancy and cost compared to dedicated DC/DC converters for each module.

Microgrid system with bi-directional inverters (US11637507B2)

Microgrid system with bi-directional inverters to balance power supply from parallel clusters. The microgrid has multiple fuel cell clusters connected in parallel to a load. Bi-directional inverters selectively connect the clusters’ DC busses to an AC bus. If a cluster’s DC output is low, an inverter imports AC from the bus to rectify. If a cluster’s DC output is high, an inverter exports AC to invert. This balances cluster power and avoids underutilization.

Microgrid system that manages power output (US20210359623A1)

Microgrid system that manages power output from paralleled fuel cell clusters to address degradation and imbalance. Bi-directional AC/DC inverters selectively connect the fuel cell clusters to the main AC bus. When a cluster’s DC output falls below a threshold, it imports AC from the bus to meet demand. When excess AC is available, it charges an auxiliary storage. This balances power between clusters and prevents under/over supply.

Grid-independent fuel cell system architecture (US20190263277A1)

A fuel cell system architecture that enables grid-independent operation using external uninterruptible power modules (UPMs). The system includes separate housings for fuel cell power modules, input/output (IOM) inverters, and UPMs, allowing parallel operation with or without grid connection. This setup ensures reliable power supply even during grid outages.

Fuel cell power system with separate modules (US10596919B2)

A power system architecture featuring separate modules for power conditioning, input/output, and uninterruptible power supply. The fuel cell stack module provides DC power, while the IOM converts DC to AC for grid connection. The UPM converts DC to AC independently, allowing seamless operation without grid synchronization issues, facilitating integration into existing systems.

#2 SMA SOLAR TECHNOLOGY AG

Headquarters: Niestetal, Germany

SMA Solar Technology is a leading global specialist in photovoltaic system technology, offering a range of solar inverters and energy management solutions for residential, commercial, and utility-scale applications.

Key Patents in Smart Grid Technology

Stabilizing voltage in low short-circuit AC grids (US20200274459A1)

Stabilizing voltage in low short-circuit AC grids when feeding power from a photovoltaic system. The method involves operating one inverter as a voltage source and the others as current sources. The voltage source inverter has a larger DC capacitance to provide enough power for grid stabilization. This allows feeding power into grids with low short-circuit ratios without voltage issues.

Control method for an inverter device (US20200212825A1)

Control method for an inverter device with integrated grid-connected, off-grid, and emergency Solar Power from Space (SPS) functionality. The method involves using different control modes based on grid conditions. In normal grid power, a unipolar H5 PWM mode is used for grid-connected operation. For grid faults or short outages, a unipolar H5 PWM constant-voltage mode is used for off-grid operation. For long grid outages, an H5-1 PWM constant-voltage mode is used for emergency SPS operation. This allows seamless transition between grid, off-grid, and SPS modes without power interruption.

Control method for an inverter with integrated functions (US11451165B2)

Control method for an inverter with integrated grid-connected, off-grid, and emergency power functions using an H5 topology. It involves switching between three control modes based on grid conditions. In normal grid power, a unipolar H5 PWM mode is used for grid-connected generation. During grid abnormalities or short outages, a unipolar H5 PWM constant voltage mode is used for off-grid operation. For long grid outages, an H5-1 PWM constant voltage mode is used for emergency space solar power generation.

Method for operating an inverter in a PV system (US10097107B2)

Method for operating an inverter in a photovoltaic (PV) system to reduce voltage stress on components connected to the AC grid. The method involves selecting an appropriate modulation method for the inverter based on the potential difference between the positive and negative terminals of the PV generator with respect to ground. This helps reduce voltage stress on components on the AC side of the inverter when connected to the grid via a transformer. By choosing a modulation method based on the PV generator polarity, it can reduce voltage spikes and harmonics that could damage grid-connected components.

#3 NEWORLD.ENERGY LLC

Headquarters: Indiana, USA

NEWORLD.ENERGY LLC specializes in microgrid solutions, enabling facilities to operate independently from the main grid using local renewable energy sources. The company’s technology focuses on grid isolation and efficient energy management to ensure continuous power supply during outages.

Key Patents in Smart Grid Technology

Microgrid system with local renewable energy sources (US20210006073A1)

A microgrid system that disconnects from the main grid and operates independently using local renewable energy sources like solar panels or batteries. The system includes an adapter that isolates the facility from the grid during outages, allowing efficient use of stored energy by converting frequencies of local power sources to match facility loads.

Microgrid system with variable frequency power (US10951036B2)

A microgrid system designed to operate independently from the grid during outages, using a microgrid adapter to manage grid-tied solar and battery systems. The system provides optimal efficiency by adjusting frequency and prioritizing renewable energy use, reducing greenhouse gas emissions.

Microgrid system with safety features (US11476666B1)

A microgrid system that can operate independently from the electrical grid, featuring variable frequency power conversion and grid isolation. It includes safety features to prevent backfeeding, ensuring reliable power supply during grid outages and compliance with grid standards.

#4 Wobben Properties GmbH

Headquarters: Aurich, Germany

Wobben Properties GmbH focuses on wind energy technology and grid services, providing solutions for efficient power integration and grid stability. The company leverages advanced inverter management and control systems to optimize wind farm operations.

Key Patents in Smart Grid Technology

Efficient power feeding into the grid (US11705737B2)

A method for efficiently feeding electrical power into a grid using wind farms or storage systems by dynamically managing inverters. The technique optimizes efficiency and reactive power capability, preventing overloading by monitoring variables like voltage and temperature.

Operating wind farms for grid services (US20200176993A1)

A method for operating wind farms to provide grid services like voltage support and frequency regulation while minimizing curtailment. The system uses voltage-impressing and current-impressing units to maintain grid stability and provide fast responses to grid events.

Wind farm operation for grid stabilization (US11108238B2)

A system for operating wind farms to stabilize the electrical grid by using voltage-influencing and current-influencing units. The system allows rapid adjustment of wind farm voltage in response to grid disturbances, ensuring smooth power adjustments as needed.

#5 CISCO TECHNOLOGY, INC.

Headquarters: San Jose, California, USA

CISCO TECHNOLOGY, INC. is a global leader in networking and technology solutions, offering integrated power distribution systems for residential and commercial buildings. The company’s innovations focus on combining renewable energy sources with conventional AC power to enhance energy efficiency and safety.

Key Patents in Smart Grid Technology

Integrated power distribution system (US20210226450A1)

An integrated power distribution system that combines renewable energy sources, AC power, and safe higher voltage DC power for consumer buildings. The system prioritizes power allocation based on load demand, ensuring critical circuits remain operational during power shortages.

Residential integrated power system (US11621565B2)

A power distribution system for residential buildings, integrating solar panels, wind turbines, and batteries with AC power. The system uses pulse DC power for data transmission and prioritizes essential circuits, turning off less critical circuits to conserve energy.

Power distribution for residential and commercial buildings (US20230033244A1)

A system that integrates AC power from the grid, DC power from renewable sources, and PoE (Power over Ethernet) data transmission. It dynamically allocates power based on availability and priority, ensuring essential circuits remain active as renewable sources fluctuate.

#6 Huawei Digital Power Technologies Co., Ltd.

Headquarters: Shenzhen, Guangdong, China

Huawei Digital Power Technologies Co., Ltd. specializes in digital power and energy solutions, focusing on maximizing power extraction from renewable sources. The company develops advanced technologies for photovoltaic systems, optimizing energy efficiency and integration with power grids.

Key Patents in Smart Grid Technology

Maximizing power extraction from solar panels (US11824496B2)

A system for maximizing power extraction from solar panels using multiple optimizers and a central inverter. Each panel has a local controller that adjusts the optimizer’s mode based on the panel’s maximum power point, ensuring efficient system voltage regulation.

Power generation system for high-power DC sources (US20230163597A1)

A system connecting multiple high-power direct current (DC) sources like solar arrays to the power grid. It uses DC switches and inverters to manage the connection and isolation of sources, allowing scalable integration with the grid.

Distributed photovoltaic systems with AC optimizers (US11515709B2)

A system for configuring distributed photovoltaic (PV) systems with multiple AC optimizers. The optimizers independently track maximum power points, and their outputs are combined for grid connection, reducing filter size and costs.

#7 Siemens Aktiengesellschaft

Headquarters: Munich, Germany

Siemens Aktiengesellschaft is a global leader in electrification, automation, and digitalization. The company provides innovative solutions for infrastructure and industry, focusing on intelligent infrastructure for buildings, distributed energy systems, and industrial automation.

Key Patents in Smart Grid Technology

Electrical power system for microgrids (US20230283071A1)

A system designed for microgrids like those on ships, featuring a segmented DC bus with dual rectifiers. It includes a diode rectifier for one segment and a switchable rectifier for the other, allowing separate feeding and isolation of segments. The system optimizes rectifier type selection based on load requirements, enabling the use of different rectifier types without parallel connection, enhancing flexibility and efficiency.

Variable DC voltage grid for wind farms (US20220045508A1)

A grid system for wind farms that adjusts DC voltage dynamically to manage power flow and stability. The system features an actuator that varies the DC voltage according to source capacity, storage charge, and load demand. This provides a responsive grid that optimizes operation and stability by reflecting the actual grid state.

DC voltage grid with dynamic adjustment (US11894675B2)

A DC voltage grid system that dynamically adjusts based on energy sources, storage units, and consumer states. The system uses an actuator to alter grid voltage, providing direct feedback to components for stabilization. This method enhances grid reliability and efficiency by allowing local responses to imbalances, improving overall system stability.

#8 COMMISSARIAT A L’ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES

Headquarters: Paris, France

The Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA) is a French public research organization focused on nuclear and renewable energy, advanced materials, and information technologies. The CEA aims to contribute to energy transition through innovative research and development.

Key Patents in Smart Grid Technology

Optimized electrical architecture for linear PV installations (US20230198265A1)

An electrical architecture designed for connecting long-distance photovoltaic installations to existing networks. The system features a DC network with parallel solar panel groups, converters for AC connection, and a control system for power flow balancing. This architecture supports high solar output, AC stability, reactive power compensation, congestion management, voltage regulation, black start capability, frequency regulation, and autonomous operation.

Electrical architecture for solar grid connection (US20230198264A1)

A system for connecting linear solar installations to the grid, featuring parallel-connected solar panels to a DC bus and two voltage source converters (VSCs) for AC grid nodes. The control system allocates solar power injection between the VSCs based on grid needs, reducing losses and enhancing stability compared to direct solar-grid connections.

#9 Solaredge Technologies Ltd.

Headquarters: Herzliya, Israel

Solaredge Technologies Ltd. specializes in smart energy solutions, including solar inverters, storage, and monitoring systems. The company is known for its innovative power optimizers and inverters that enhance solar energy harvesting and efficiency.

Key Patents in Smart Grid Technology

Distributed power generation with micro-inverters (US20200119632A1)

A system using multiple micro-inverters to connect photovoltaic panels to the grid. Each micro-inverter controls the input DC power and has a bypass path for faults. The panels are connected to micro-inverters, which convert DC to lower AC voltage and form a serial string. This setup allows individual inverter faults without affecting overall output, ensuring synchronization with grid voltage and reliable operation.

Reliable distributed power generation system (US20220077757A1)

A system employing multiple micro-inverters connected in parallel to photovoltaic panels. The micro-inverters convert DC output to lower AC voltage, forming a series output synchronized to grid voltage. The system includes bypass paths for external currents, enhancing reliability and preventing failure isolation. A central control monitors grid voltage and ensures proper synchronization.

#10 Zyntony, Inc.

Headquarters: Utah, USA

Zyntony, Inc. focuses on innovative photovoltaic systems optimized for rooftops with limited space and shading constraints. The company’s technology maximizes solar power generation by using short-string optimizers for efficient energy conversion and utilization.

Key Patents in Smart Grid Technology

Short-string optimized photovoltaic system (US11082003B2)

A system designed for maximizing power generation from solar panels in space-constrained or shaded environments. It uses a series connection of solar panels with dedicated optimizers for each short string. These optimizers track the maximum power point and output DC power to a common bus, allowing flexible panel placement and independent optimization, mitigating shading issues.

Optimized short-string photovoltaic system (US20180294770A1)

A photovoltaic system featuring short-string optimizers that minimize system costs and reduce failure points. The system includes a solar panel, power inverter, and short-string optimizer, designed to efficiently convert solar energy into electrical power while being resilient to individual component failures.

#11 Smart Wires Inc.

Headquarters: Durham, NC, USA

Smart Wires Inc. provides innovative solutions for grid optimization and power flow control. The company’s technologies enable utilities to enhance grid capacity, stability, and efficiency by managing power flows across transmission and distribution networks.

Key Patents in Smart Grid Technology

Power flow control system for distribution grids (US20230216301A1)

A system designed to optimize power flow and stability in distribution grids with renewable energy sources. It utilizes active filters connected in series and a full-bridge shunt inverter with batteries. The system selectively sources power from renewables, batteries, or the transmission grid, stabilizing voltage and preventing blackouts.

Grid-forming capability for distribution systems (US20230109775A1)

A capability that allows power distribution systems to operate independently and stabilize when disconnected from the main grid. The system uses a shunt inverter with a controller and battery/power source, providing reactive power, voltage support, and stability during grid disconnection, preventing voltage collapse and blackouts.

#12 ABB Schweiz AG

Headquarters: Zurich, Switzerland

ABB Schweiz AG is a leading technology company specializing in electrification, robotics, automation, and motion. The company develops innovative solutions for energy efficiency, sustainability, and industrial automation.

Key Patents in Smart Grid Technology

Inverter system for photovoltaic panels (US20190190272A1)

An inverter system designed to recover degraded photovoltaic panels by disconnecting the negative pole from the DC link during recovery mode. This prevents potential induced degradation (PID) and isolates the panel’s negative pole from the inverter and grid potential. The system maintains DC link voltage and allows recovery without grounding the negative pole, enhancing system durability.

Large-scale solar power plant design (US20210135455A1)

A design for large-scale solar power plants using modular multilevel converters (MMCs). The system connects multiple photovoltaic clusters to a common low voltage bus, with each cluster having string optimizers and a DC/DC converter. The MMCs convert DC to AC for grid connection, reducing costs and improving efficiency compared to traditional central inverters.

#13 Hamilton Sundstrand Corporation

Headquarters: Windsor Locks, Connecticut, USA

Hamilton Sundstrand Corporation, a unit of Collins Aerospace, specializes in aerospace and industrial systems, including advanced power generation and control systems. The company focuses on providing reliable, efficient, and innovative solutions for aviation and other industries.

Key Patents in Smart Grid Technology

Generator system with improved voltage regulation (US11502617B2)

A generator system featuring local feedback from output lines for voltage regulation and protection. The system uses a controller connected to output lines with local sense leads to receive feedback, which is used to regulate the inverter output. This decentralized feedback approach enhances harmonic correction and voltage regulation compared to traditional centralized systems.

Generator system with harmonic mitigation (US10715029B1)

A generator system employing local feedback and point of reference (POR) feedback for voltage regulation and harmonic mitigation. The system’s controller receives feedback from output and load input lines, using local feedback for accurate voltage regulation and POR feedback for harmonic correction. This design improves system stability and efficiency, reducing voltage drop and overvoltage issues.

#14 NATIONAL TECHNOLOGY & ENGINEERING SOLUTIONS OF SANDIA, LLC

Headquarters: Albuquerque, New Mexico, USA

National Technology & Engineering Solutions of Sandia, LLC, operates Sandia National Laboratories, a multidisciplinary research and development organization focused on national security, energy technologies, and global security.

Key Patents in Smart Grid Technology

Power Packet Networks for Wave Energy Converter Arrays (US11725622B1)

Power packet networks for wave energy converter arrays that maximize energy capture while minimizing installation and operational costs. The system leverages the physical location of the wave energy converters with respect to the incoming wave front to increase power capture and improve power quality. By phasing the inputs on a collection bus, the system minimizes the energy stored by the storage system to maintain constant bus voltage.

Wind Farm Power Phase Control with a DC Collection Bus (US20230283079A1)

Wind farm power phase control using a DC collection bus and energy storage system to enable stable voltage regulation for wind farms with multiple turbines. The phase of the DC current generated by each turbine is controlled relative to others to minimize the required energy storage capacity for regulating the overall DC bus voltage. This reduces the size and cost of the energy storage system compared to a centralized storage system for the entire wind farm.

#15 SUNGROW POWER SUPPLY CO., LTD.

Headquarters: Hefei, Anhui, China

Sungrow Power Supply Co., Ltd. is a leading global provider of inverter solutions for photovoltaic systems and energy storage systems. They focus on developing innovative products that enhance the efficiency and reliability of renewable energy systems.

Key Patents in Smart Grid Technology

Medium-voltage grid-connected photovoltaic inverter system (US20230163600A1)

Medium-voltage grid-connected photovoltaic inverter system that allows connecting to the grid without external voltage sensors. The system uses a medium-voltage switch integrated with voltage sensors to detect line voltages at the input and output sides. An inverter controller switches the medium-voltage switch based on the detected voltages to connect/disconnect the inverter to the grid. This eliminates the need for external voltage sensors, reducing size and cost compared to traditional grid-connected systems.

Medium-voltage grid-connected photovoltaic inverter system with integrated current sensor (US20230134016A1)

Medium-voltage grid-connected photovoltaic inverter system with integrated current sensor for short circuit protection. The system connects the photovoltaic inverter to a medium-voltage grid via a medium-voltage switch with an integrated current sensor. Before connecting to the grid, the inverter stops and the switch opens if the grid current is too high, indicating a short circuit. This prevents inverter damage from grid faults. The sensor integrated into the switch eliminates the need for external grid current sensing.

Medium and high voltage energy conversion system (US10978964B2)

Medium and high voltage energy conversion system for grid-connected photovoltaic power plants with simplified control, reduced cost, and improved reliability compared to conventional systems. The system uses a modular architecture with isolated DC/DC converters, cascade modules, filters, and controllers. The converters convert input voltage to an instruction related to the common bus voltage. 

The system controller calculates the grid control signal based on bus voltage. This allows independent converter control without coupling. The cascade modules connect in series. The filters connect the outputs. This eliminates the need for complex coupling control. The isolated converters can be identical modules with simplified control. The system reduces cost, complexity, and improves reliability compared to cascading converters with coupling control.

Grid-connected photovoltaic inverter system without ring main units (US20230113216A1)

Grid-connected photovoltaic inverter system for medium voltage grids that eliminates the need for ring main units. The system has a photovoltaic inverter, medium voltage transformer, switchgear, and grid-connected controller. The inverter connects to the low voltage side of the transformer, the transformer connects to the switchgear, and the switchgear connects directly to the medium voltage grid. This forms a ring network without a separate ring main unit.

#16 NAVIA ENERGY INC.

Headquarters: Los Angeles, California, USA


Navia Energy Inc. specializes in advanced energy systems that provide resilient and adaptive power solutions, focusing on integrating renewable energy sources with smart grid technologies to enhance energy reliability and efficiency.

Key Patents in Smart Grid Technology

Energy system with grid or off-grid operation (US20240146070A1)

An energy system that can provide power to the grid or continue supplying power during grid failures. The system converts power from a renewable source into AC grid-synchronized output. In normal grid conditions, it feeds power back to the grid. But during grid outages, it keeps supplying power to the loads directly, avoiding downtime. This is achieved by an AI agent that predicts grid failures and switches to off-grid mode. The AI uses historical data and real-time monitoring to make the decision. The system also has an alternate power path through a separate output.

Energy system with AI control for grid failures (US20220109305A1)

Energy system that can operate both connected to the power grid and disconnected during grid failures. The system converts renewable energy into synchronized AC power that can be fed back to the grid during normal operation. But it can also provide power to connected loads during grid outages by switching to an off-grid mode. This is achieved using a control system with artificial intelligence to manage the transition between grid-connected and standalone operation. The system can detect grid failures and seamlessly switch to off-grid mode without downtime. This allows uninterrupted power supply from renewable sources during grid outages.

#17 XFLOW ENERGY COMPANY

Headquarters: Seattle, USA

XFlow Energy Company focuses on enhancing the integration of renewable energy sources with grid systems by developing innovative solutions for energy transfer and utilization, particularly through advanced inverter technologies.

Key Patents in Smart Grid Technology

Use of solar inverters in non-solar renewable systems (US11791634B2)

Enabling use of solar inverters in non-solar renewable energy systems by providing a solution to connect AC generators and variable frequency drives (VFDs) to the grid using a solar inverter. The solution involves adding power transfer capability from the grid to the DC bus during initialization, allowing the solar inverter to provide power to the DC bus when needed. This enables using solar inverters in non-solar renewable energy systems that require bi-directional power flow on the DC bus. It also allows connecting the grid directly to the DC bus through the solar inverter, bypassing the VFD, for applications like using induction generators or motoring turbine rotors. This leverages the grid connection capabilities of solar inverters, which are already certified to grid standards, for non-solar renewable energy systems.

Using a solar inverter with a variable frequency drive (US20240097451A1)

Using a solar inverter with a variable frequency drive (VFD) to transfer power from an AC generator to the grid. The solar inverter is connected between the VFD and the grid, with the VFD controlling the generator’s rotation speed. This allows leveraging the solar inverter’s grid certification and robustness while using the VFD to manage the generator’s operation. The VFD provides stable DC voltage to the solar inverter, preventing damage from variable DC voltages. The solar inverter can also provide power to the DC bus during initialization. This enables using a solar inverter for non-solar renewable sources like wind, water, wave, hydrokinetic, and potential energy storage.

#18 BATTELLE MEMORIAL INSTITUTE

Headquarters: Columbus, Ohio, USA

Battelle Memorial Institute is a global leader in research and development, providing solutions in areas such as national security, energy, and health. They focus on developing advanced technologies to address critical challenges and improve the quality of life.

Key Patents in Smart Grid Technology

Improving frequency stability of islanded power grids (US11515704B2)

Improving frequency stability of islanded power grids using distributed power electronics devices like grid-edge voltage regulators. The method involves adjusting the voltage setpoints of these devices in response to line frequency variations to stabilize the grid frequency without tripping loads. This is done autonomously by the devices without external commands. It leverages the sensitivity of loads to voltage changes to counteract frequency transients. The devices can also coordinate frequency regulation through their voltage setpoints.

Transactive energy for distribution grid resiliency (US20220084139A1)

A method for using transactive energy to improve distribution grid resiliency by engaging distributed energy resources (DERs) to support switching operations during outages. The method involves incentivizing DERs to adjust their voltage output to reduce differences across grid switching device terminals. This allows more switch closures during restoration. A transactive algorithm converts DER supply bids into voltage bids based on network sensitivity to capture locational value. Utilities request voltage changes from DERs to balance grid constraints.

#19 TIGO ENERGY, INC.

Headquarters: California, USA

Tigo Energy, Inc. is an innovative company specializing in smart module technology and energy management solutions for solar power systems, focusing on optimizing energy production and system performance.

Key Patents in Smart Grid Technology

Balancing power output from solar arrays with multiple strings (US20230084452A1)

Balancing power output from solar arrays with multiple strings to improve overall performance. The balancing is done by independently controlling the duty cycles of DC-DC converters connected to each solar module. By adjusting module duty cycles based on measurements, weak modules can be balanced with strong modules in a string and weak strings can be balanced with strong strings in the array. This allows using maximum power point tracking (MPPT) for the array as a whole. The balancing iteratively converges module currents and string voltages.

Balancing power output from solar arrays by individually adjusting module operating points (US20230369851A1)

Balancing power output from solar arrays by individually adjusting the operating points of each module to optimize string and array performance. The method involves using local management units (LMUs) connected to each module to independently control its current and voltage. The LMUs monitor module parameters and adjust duty cycles to maximize module power points. The LMUs also communicate to balance string voltages and find the MPP for the entire array. This allows weak modules and strings to be compensated without affecting strong ones.

Energy Collection from Variable Sources (US10454275B2)

A method for collecting energy from variable sources like wind and solar farms using static inverters. The method includes converting DC to AC with string converters, then to grid-compatible AC with a static inverter, and optionally using PWM inverters for high voltage DC transmission.

#20 KOHLER CO.

Headquarters: Kohler, Wisconsin, USA

Kohler Co. is a global leader in manufacturing plumbing products, engines, and power systems. They are known for their innovative solutions in both residential and commercial sectors, focusing on high-performance and efficient power systems.

Key Patents in Smart Grid Technology

Isolated Inverter Circuits for Power Systems with Multiple Isolated Power Sources (US20220140749A1)

Isolated inverter circuits designed for power systems with multiple isolated power sources. The circuits feature isolated DC buses for each source, preventing current flow between sources. This setup enhances efficiency by allowing the sources to be balanced without affecting performance due to loading differences. Additionally, the circuits include dynamic anti-shoot-through delay adjustment to reduce excessive switching currents during simultaneous switch conduction.

Isolated Inverter Circuit for Power Conversion Applications (US20190190401A1)

An inverter circuit that eliminates the need for isolated DC buses and transformers by using a rotating shaft in an alternator. This design stores energy absorbed from the load during reverse conduction, preventing excessive voltage on the DC bus and enabling the inverter to operate with reduced cost, size, and complexity.

#21 STATE GRID JIANGSU ELECTRIC POWER COMPANY RESEARCH INSTITUTE

Headquarters: Jiangsu, China

STATE Grid Jiangsu Electric Power Company Research Institute focuses on advanced research and development in power grid technology, emphasizing efficiency and reliability in power systems.

Key Patents in Smart Grid Technology

Method and Apparatus for Improving Efficiency of DC-Coupled PV Systems (US20230283070A1)

A method and apparatus designed to enhance the efficiency of DC-coupled photovoltaic systems by switching between maximum power point tracking (MPPT) and voltage regulation modes. The approach involves controlling the PV cells in MPPT mode and periodically adjusting the controllable power source between MPPT and voltage regulation to optimize system power.

#22 AMPT, LLC

Headquarters: Colorado, USA

AMPT, LLC specializes in advanced DC-DC converter technology to optimize solar power conversion. Their innovative solutions improve the efficiency and reliability of solar energy systems.

Key Patents in Smart Grid Technology

Maximizing Efficiency of Converting Solar Power into AC Electricity (US20190296555A1)

A system that enhances the efficiency of converting solar power to AC electricity by coordinating the DC-DC converter and DC-AC inverter. This system allows for independent optimization of both converters’ operating points, using duty cycle switching to maintain optimal input voltage while maximizing solar power extraction and protecting the inverter from overvoltage.

#23 CYBOENERGY, INC.

Headquarters: California, USA

CyboEnergy, Inc. develops advanced off-grid solar power systems that integrate with existing grid sources, offering flexible and reliable energy solutions for various applications.

Key Patents in Smart Grid Technology

Off-Grid Solar Power System with Grid Integration (US11258267B1)

An off-grid solar power system that operates independently without batteries and integrates with an existing grid power source. The system uses a specialized inverter to convert DC power from solar panels directly to AC power for off-grid use, while also sensing and switching to grid power when available for uninterrupted operation.

#24 WATTIUM OY

Headquarters: Espoo, Finland

Wattium OY focuses on developing efficient off-grid power systems with dynamic control features to optimize power consumption and enhance system performance.

Key Patents in Smart Grid Technology

Efficient Off-Grid Power System with Dynamic Inverter Control (US20240154416A1)

An off-grid power system featuring dynamic inverter control that adjusts based on AC load demand. The system uses internal measurements and a controller to select the appropriate inverter mode (low-level or high-level), optimizing efficiency and avoiding idle current when the demand is low.

#25 SOUTHWIRE COMPANY, LLC

Headquarters: Carrollton, Georgia, USA

Southwire Company, LLC is a leading manufacturer of wire and cable products, focusing on innovation and efficiency in electrical systems and power transmission.

Key Patents in Smart Grid Technology

Solar Power Generation System with Distributed Power Converter Nodes (US11251621B1)

A solar power generation system utilizing distributed power converter nodes to convert DC power from solar modules into a deadband DC waveform. This waveform is transmitted to a centralized grid interface box, which converts it into AC for grid connection. This approach enhances module-level efficiency, reduces costs, and improves reliability compared to centralized inverters.

Cable Integrated Solar Inverter System (US11387775B2)

A cable-integrated solar inverter system that converts DC power from solar panels to AC power for grids. The system uses power converter cartridges integrated into the trunk cable connecting the solar panels, with serially connected cartridges and a grid interface unit to rectify and clean the output waveform. The system combines serial communication and synchronization signals onto one wire for efficient signaling.

#26 FAITH TECHNOLOGIES, INC.

Headquarters: Menasha, Wisconsin, USA

Faith Technologies, Inc. is a leader in electrical and technology solutions, specializing in integrating local renewable energy sources with the electric utility grid while optimizing power systems.

Key Patents in Smart Grid Technology

Power System for Local Renewable Energy Sources (US20220399722A1)

A power system that allows local renewable energy sources to connect to the grid without the risk of the grid extracting power from the local system. The system uses a unidirectional AC-to-DC power supply, ensuring that the local system can provide power without being required to offer grid services or face curtailment issues.

#27 THE GOVERNMENT OF THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY OF THE NAVY

Headquarters: Washington, D.C., USA

The Secretary of the Navy represents the U.S. Department of the Navy, which focuses on advancing naval technologies and ensuring national security through research and development.

Key Patents in Smart Grid Technology

Controlling a Photovoltaic-Enabled Distribution Grid (US11368024B2)

A method for controlling a photovoltaic-enabled distribution grid to mitigate voltage fluctuations and power losses during unexpected high power loads. The system uses a model predictive controller and an optimal steady-state feedback controller to stabilize grid frequency and reduce power loss, enhancing overall grid performance.

#28 ENPHASE ENERGY, INC.

Headquarters: California, USA

Enphase Energy, Inc. specializes in microinverter technology and energy management solutions, providing advanced systems for residential and commercial solar power applications.

Key Patents in Smart Grid Technology

Microinverter with Integrated Neutral Forming Function (US20230216309A1)

A microinverter with an integrated neutral forming function designed for off-grid power systems. The microinverter includes an AC output connected to a three-line connector with a neutral line, providing neutral forming functionality for both single-phase and split-phase grids without the need for separate transformers or relays.

#29 EDGE ELECTRONS LIMITED

Headquarters: Melbourne, Australia

Edge Electrons Limited specializes in innovative solutions for electrical distribution networks, focusing on stabilizing voltage and optimizing energy distribution in complex environments.

Key Patents in Smart Grid Technology

Voltage Regulation in Low Voltage Networks (US20190363536A1)

A system designed to mitigate voltage fluctuations in low voltage electrical distribution networks caused by distributed energy generation devices. The system employs Energy Process Units (EPU) along distribution sections to regulate voltage precisely at user premises, even with wide variations in input voltage. This ensures stable operation and prevents issues like device malfunctions and protective equipment tripping.

#30 SPARQ SYSTEMS INC.

Headquarters: Ontario, Canada

Sparq Systems Inc. focuses on providing reliable power solutions from renewable energy sources, ensuring efficient operation in both grid-connected and standalone modes.

Key Patents in Smart Grid Technology

Renewable Energy Power Generation System (US11621666B2)

A system that utilizes renewable energy sources, such as solar panels, to provide reliable power to loads. It features an inverter, DC/DC converter, and a control system that enables sensorless motor control in standalone mode and synchronizes inverters in grid mode, enhancing operational reliability and efficiency.

#31 KRIPYA LLC

Headquarters: Washington, USA

Kripya LLC specializes in modular inverter systems for off-grid solar applications, enabling efficient and stable power generation with varying loads.

Key Patents in Smart Grid Technology

Modular DC-AC Inverters for Off-Grid Systems (US11303221B1)

Modular inverters designed for off-grid solar power systems that operate reliably with varying loads. The system includes a master inverter generating the AC waveform and follower inverters synchronizing with it, allowing stable parallel operation without complex phase synchronization.

#32 CUMMINS POWER GENERATION LTD. (UK)

Headquarters: Wellingborough, United Kingdom

Cummins Power Generation Ltd. focuses on hybrid power systems that integrate multiple power sources to enhance efficiency and load sharing.

Key Patents in Smart Grid Technology

Hybrid Power Generation System (US20200259331A1)

A hybrid power system that efficiently shares loads between a diesel generator and an external power source like solar panels. The system uses an inverter to convert DC power from the external source and integrates it with the generator’s AC power, managed by a controller based on demand and source availability.

#33 SIEMENS GAMESA RENEWABLE ENERGY INNOVATION & TECHNOLOGY S.L.

Headquarters: Spain

Siemens Gamesa Renewable Energy focuses on innovative and fault-tolerant systems for wind power plants, optimizing DC power collection and grid integration.

Key Patents in Smart Grid Technology

DC Collector System for Wind Power (US20230246450A1)

A cost-effective DC collector system for wind power plants that utilizes a symmetrical monopole topology to collect and transport DC power from turbines. The system includes current blocking devices to protect against faults and avoid the need for complex converters or circuit breakers.

#34 MARK DANIEL FARB

Mark Daniel Farb specializes in optimizing fluid turbine operations and energy management for improved efficiency and grid compliance.

Key Patents in Smart Grid Technology

Coordinated Operation of Fluid Turbines (US20230327455A1)

A method to improve efficiency and compliance with grid requirements by coordinating fluid turbines. It includes storing excess energy, regulating DC voltage for grid connection, and using dual-channel control to extract more power under low fluid conditions.

#35 X ELECTRIX POWER GMBH

Headquarters: Austria

XelectriX Power GmbH offers advanced power supply solutions that integrate grid and storage systems for flexible energy sourcing.

Key Patents in Smart Grid Technology

Flexible Power Sourcing System (US20190229546A1)

A power supply system that efficiently switches between grid and storage power. It features parallel connections to the grid and a DC link to storage, with a converter optimizing power output based on grid conditions and storage charge levels.

#36 CHINA UNIVERSITY OF PETROLEUM BLUE SKY (QINGDAO) PETROLEUM TECHNOLOGY CO., LTD

Headquarters: Qingdao, China

China University of Petroleum focuses on energy-efficient power supply systems for specialized applications such as oil wells.

Key Patents in Smart Grid Technology

Multi-Source Microgrid for Oil Wells (US20220094174A1)

A microgrid power supply system designed for oil wells that reduces energy loss and improves reliability. It includes components such as transformers, rectifiers, and inverters, providing a concentrated DC power supply to multiple wells with reduced losses compared to conventional AC-DC-AC conversions.

#37 PRESENT POWER SYSTEMS, LLC

Headquarters: Wisconsin, USA

Present Power Systems specializes in energy storage systems with advanced balancing and power management features for efficient AC load powering.

Key Patents in Smart Grid Technology

Automatic Power Balancing in Storage Systems (US20230369982A1)

A system for automatic power balancing in energy storage systems with multiple batteries and DC-DC converters. It monitors power flow at the AC output and adjusts current commands to maintain desired power levels, adapting to changes in AC load and grid connection.

#38 MARK STEPHEN DUDZINSKI

Mark Stephen Dudzinski specializes in developing self-organizing DC grids that enhance resilience and operational flexibility.

Key Patents in Smart Grid Technology

Variable Voltage DC Grid (US20190165576A1)

A self-organizing variable voltage DC grid that operates over wide voltage ranges without central control. Nodes in the grid manage connections based on local voltage measurements, allowing autonomous operation and recovery from blackouts.

#39 G & W ELECTRIC COMPANY

Headquarters: Chicago, USA

G & W Electric Company offers advanced microgrid systems that enhance grid resilience, power quality, and reliability.

Key Patents in Smart Grid Technology

Advanced Microgrid Control System (US20230369864A1)

A microgrid system featuring components like photovoltaic panels, batteries, and generators with advanced control capabilities. It includes features for predictive load shedding, islanding, reconnection, and frequency regulation, ensuring grid resilience and optimized power flow.

#40 GM GLOBAL TECHNOLOGY OPERATIONS LLC

Headquarters: Michigan, USA

GM Global Technology Operations focuses on improving electric vehicle performance and reliability through advanced motor control technologies.

Key Patents in Smart Grid Technology

Voltage Spike Reduction in Electrified Vehicles (US20240162846A1)

A method for controlling electric motors in electrified vehicles to reduce voltage spikes. It involves a voltage regulation device with a diode bridge rectifier to absorb resonant energy and prevent voltage spikes during motor operation, enhancing reliability.

#41 CONVERT TECH S.R.L.

Headquarters: Italy

Convert Tech S.R.L. provides innovative systems for managing power in photovoltaic plants, optimizing both DC and AC power usage.

Key Patents in Smart Grid Technology

Dual-Function Converter for Photovoltaic Plants (US20200203954A1)

A converter system for photovoltaic plants that switches between boosting DC voltage and inverting DC to AC. This setup eliminates the need for separate DC and AC power lines and inverters, allowing solar panels to serve both as a power source and backup battery.

#42 INDIAN INSTITUTE OF TECHNOLOGY BOMBAY

Headquarters: Bombay, India

The Indian Institute of Technology Bombay focuses on advanced power control technologies, especially for photovoltaic systems.

Key Patents in Smart Grid Technology

Transformerless Converters for PV Arrays (US11152863B2)

A method for controlling power extraction from multiple PV arrays using transformerless converters to prevent ground leakage current. The system includes converters with internal capacitors to balance charging and discharging, eliminating ground leakage and optimizing grid current modulation.

Transformerless Converters for PV Arrays (US20200028440A1)

A method and system to extract power from multiple PV arrays using transformerless converters, which eliminates ground leakage currents while maintaining high efficiency. The converters connect between the PV arrays and grid, with each converter supplying current to the grid. Negative terminals of the PV arrays form a common neutral point, allowing for negative output voltages using internal capacitors. DC is injected into the converter outputs instead of the grid, preventing ground leakage. The converters are controlled to extract power from the PV arrays using predefined methods.

#43 BEHNAM TAMIMI

Behnam Tamimi focuses on developing cost-effective and compact interface controllers for integrating microgrids with main power grids, utilizing advanced converter technology.

Key Patents in Smart Grid Technology

Microgrid Interface Controller (US20240136823A1)

A lower-cost, smaller interface controller for connecting a microgrid to a main power grid using bidirectional AC/DC converters and an AC link with a current divider to balance power flow. The controller replaces large, high-voltage transformers with separate bidirectional converters for each grid side and a current divider to balance power, allowing for lower voltage operation and reduced size and cost compared to conventional systems.

#44 BREK ELECTRONICS INC.

Headquarters: California, USA

Brek Electronics Inc. specializes in high-power density DC-AC inverter designs that offer improved performance and reduced electromagnetic interference.

Key Patents in Smart Grid Technology

High-Power Density DC-AC Inverter (US20220278602A1)

A DC-AC inverter design featuring high power density, reduced reactive elements, and lower electromagnetic interference (EMI) compared to conventional inverters. The inverter employs wide bandgap power devices like SiC MOSFETs for high-frequency switching, reducing filter inductance and capacitance. Phase-shifted pulse-width modulation (PWM) with fast-switching half-bridges introduces high-frequency PWM into the output voltage, minimizing harmonic content and enabling smaller filter capacitors and EMI filters.

#45 KHALIFA UNIVERSITY OF SCIENCE AND TECHNOLOGY

Headquarters: UAE

Khalifa University of Science and Technology focuses on innovative power converter architectures for small-scale applications like CubeSats, optimizing energy harvest and reducing system footprint.

Key Patents in Smart Grid Technology

Compact Power Converter for CubeSats (US20240158107A1)

A compact power converter architecture for CubeSats designed to maximize solar energy harvest and minimize footprint. The system uses a single inductor per solar panel and battery, with a series-connected half-bridge fed by the panels and a boost converter to the battery. This design allows true maximum power point tracking (MPPT) for each panel with varying irradiation and includes power-down modes for enhanced reliability and reduced semiconductor stress during low-load conditions.

#46 NDSU RESEARCH FOUNDATION

Headquarters: Fargo, USA

NDSU Research Foundation focuses on integrating solar power systems into roadside structures, enhancing their functionality without compromising primary uses.

Key Patents in Smart Grid Technology

Solar Power System for Roadside Structures (US11984846B2)

A solar power system designed for roadside structures like noise barriers and snow fences, integrating solar panels without affecting their primary functions. The system uses inverters with isolated stages to convert the low voltage solar panel output to a stable voltage and then to AC for the load. Synchronization controllers ensure phase alignment when multiple inverters are connected in series, enabling scalable solar arrays without performance issues.

#47 THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS

Headquarters: Illinois, USA

The Board of Trustees of the University of Illinois develops advanced wind power systems, focusing on efficiency improvements and loss reduction.

Key Patents in Smart Grid Technology

Integrated Generator-Rectifier System for Wind Power (US20240006889A1)

An integrated generator-rectifier system for wind power that enhances efficiency and reduces losses. The system uses a multi-port permanent magnet synchronous generator (PMSG) with passive and active rectifiers. Phase-shifting PMSG back EMFs eliminates the need for passive rectifiers, and series-connected active rectifier inputs reduce rectification requirements and losses. The active rectifier output connects to a converter for grid interfacing, with control based on PMSG power to maximize power extraction.

#48 GREE ELECTRIC APPLIANCES, INC. OF ZHUHAI

Headquarters: Zhuhai, China

Gree Electric Appliances, Inc. of Zhuhai provides advanced direct current power distribution systems that enhance efficiency and reduce battery usage.

Key Patents in Smart Grid Technology

DC Power Distribution System (US20210288514A1)

A direct current power distribution system that improves efficiency and reduces battery use by coordinating converters, frequency converters, and storage devices. The system manages power flow based on load conditions and battery state, optimizes power sharing between AC and DC loads, and prolongs battery life by discharging and charging as needed. It supports mixed DC/AC loads and grid connection, with a central control unit coordinating component operations based on various parameters.

#49 UT-BATTELLE, LLC

Headquarters: Tennessee, USA

UT-Battelle, LLC develops hierarchical power architectures that provide reliable power generation, distribution, and cybersecurity for the power grid.

Key Patents in Smart Grid Technology

Hierarchical Power Architecture for Grid Reliability (US20240022110A1)

A hierarchical power architecture designed to provide reliable power generation, distribution, and cybersecurity. The system uses modular power converters for grid-compliant power generation from renewable sources, combined with an AI-based control system to detect and mitigate malicious commands and bad data, enhancing cybersecurity and reliability.

#50 SHOUICHI TANAKA

Shouichi Tanaka focuses on power systems for electric vehicles, improving cost-efficiency and performance with innovative charger designs.

Key Patents in Smart Grid Technology

Power System for Electric Vehicles (US20210288506A1)

A power system for electric vehicles that reduces costs while improving performance compared to conventional on-board chargers. The system features a dual inverter connected to a double-ended three-phase motor coil, allowing simple single-phase grid connection and voltage boosting or dropping to match battery voltage. The system also uses a voltage-changing DC power supply with a reactor to minimize losses.

#51 NEXTRACKER LLC

Headquarters: California, USA

NexTracker LLC provides advanced parallel inverter systems that enhance efficiency and reduce ripple in solar power applications.

Key Patents in Smart Grid Technology

Parallel Inverter System (US20240014751A1)

A parallel inverter system designed to minimize circulating currents, mitigate ripple, and increase efficiency in applications like solar power plants. The system features multiple inverters connected in parallel with a common DC bus, each equipped with a common-mode filter and controlled with interleaved PWM signals to reduce circulating currents and harmonics.

#52 RAJIV KUMAR VARMA

Rajiv Kumar Varma focuses on optimizing solar farm inverters to enhance grid stability and voltage regulation, particularly during off-peak times.

Key Patents in Smart Grid Technology

Solar Farm Inverter Utilization for Grid Stability (US20190245353A1)

A method for utilizing underutilized solar farm inverters at night and partially utilized inverters during the day to provide voltage regulation and damping control for grid stability. The method involves controlling inverters to inject reactive power and provide damping during grid transients, improving stability and allowing more wind turbines to connect without voltage issues.

#53 VESTEL ELEKTRONIK SANAYI VE TICARET A.S.

Headquarters:Turkey

Vestel Elektronik Sanayi ve Ticaret A.S. specializes in reducing harmonic distortion in multi-inverter solar power systems through advanced phase-shifting techniques.

Key Patents in Smart Grid Technology

Reducing Harmonic Distortion in Solar Power Systems (US20210184593A1)

A method for reducing harmonic distortion in multi-inverter solar power systems by phase-shifting the switching processes of inverters. The controller coordinates the switching of multiple inverters to cancel harmonics and reduce total harmonic distortion (THD) on the output grid compared to using passive filters.

#54 THE FLORIDA INTERNATIONAL UNIVERSITY BOARD OF TRUSTEES

Headquarters: Florida, USA

The Florida International University Board of Trustees develops hybrid renewable energy systems that enhance efficiency and resilience in energy production.

Key Patents in Smart Grid Technology

Resilient Efficient Renewable Energy-Shed Optimizer (RERESO) (US11626731B1)

A hybrid renewable energy source system, called RERESO, designed to increase efficiency and resiliency of renewable energy systems. The RERESO combines a renewable source like solar with energy storage, featuring controllers at the inverter and converter level, and a robust coordinated controller. It forecasts solar generation using neural networks, allowing features such as decoupled P-Q control, virtual inertia, battery management, and grid forming capabilities.

#55 GENERAL ELECTRIC TECHNOLOGY GMBH

Headquarters: Ohio, USA

General Electric Technology GmbH focuses on advanced power transmission networks, integrating DC and AC networks with synchronized voltage control.

Key Patents in Smart Grid Technology

Central Power Converter for Network Synchronization (US20220102979A1)

A power transmission network featuring a central power converter to interconnect a DC network with multiple AC networks and a control system for voltage synchronization. The converter adjusts AC voltage to synchronize the AC network voltages by establishing a virtual voltage, balancing network voltages without individual voltage regulators on each AC line.

#56 SUDARSHAN S KRISHNAMOORTHY

Sudarshan S Krishnamoorthy specializes in uninterrupted power supply systems that seamlessly integrate renewable energy sources with grid power to ensure consistent energy availability.

Key Patents in Smart Grid Technology

Uninterrupted Power Supply System Using Renewable Energy Sources (US20230108060A1)

An uninterrupted power supply system using renewable energy sources like solar panels and wind turbines that can seamlessly switch between grid power and local renewable power during grid outages without interrupting the load. The system has a smart relay that connects the load to both the grid and the local renewable power source. A microcontroller monitors grid and local power levels, synchronizes the local power to match grid frequency during grid restoration, and maintains power flow from grid to local during outages. The smart relay prevents reverse currents and allows smooth transitions, enabling the use of local renewables to their fullest while drawing only differential grid power.

#57 LG INNOTEK CO., LTD.

Headquarters: Seoul, South Korea

LG Innotek Co., Ltd. specializes in advanced photovoltaic power systems with innovative solutions to reduce power ripples and stabilize energy generation.

Key Patents in Smart Grid Technology

Photovoltaic Power Generation System with Active Power Filter (US11870266B2)

A photovoltaic power generation system with reduced power ripples using an active power filter that regenerates energy to stabilize the system. The system includes converters for DC-AC and AC-DC conversion, an active power filter to reduce ripples, an energy storage device, and a transmission line. When the active filter’s energy exceeds a threshold, it transfers that energy to the first converter via the transmission line. This regenerated energy helps stabilize the converters and prevents stoppages due to excessive filter voltage.

#58 Epirus, Inc.

Headquarters: California, USA

Epirus, Inc. focuses on high-power RF amplifier protection systems designed to enhance reliability and performance under various operating conditions.

Key Patents in Smart Grid Technology

Protection System for High-Power RF Amplifiers (US20230006615A1)

A protection system for high-power RF amplifiers against overcurrent and overvoltage conditions. The system includes a limiter circuit with inductors that shunt excessive current or voltage to prevent amplifier failure. It also features a bias controller that monitors gate voltage and maintains it within a safe range to prevent malfunctioning. The amplifier is positioned close to the load it powers, and a distributed power system provides DC from a central source to each amplifier. A split capacitor system with fast and bulk capacitors supplies power to the amplifier, with a battery backup maintaining gate voltage during power failures.

#59 The Boeing Company

Headquarters: Chicago, Illinois, USA

The Boeing Company is a leading aerospace manufacturer that innovates in hybrid electric aircraft power management and control systems.

Key Patents in Smart Grid Technology

Active Power Flow Control and Battery Power Management for Hybrid Electric Aircraft (US10589635B1)

A system for active power flow control and battery power management in hybrid electric aircraft with multiple power sources. The system features an active voltage controller on the high-voltage DC bus that actively adjusts bus voltage to optimize power extraction. The controller sends a reference voltage signal to a rectifier unit to regulate the bus voltage, enabling tight control of power flow between sources like batteries and generators for optimal charging and discharging.

#60 CESKA ENERGETICKO-AUDITORSKA SPOLECNOST, S. R. O.

Headquarters: Prague, Czech Republic

Ceska Energeticko-Auditorska Spolecnost, S. R. O. provides innovative devices for optimizing electricity production, consumption, and storage from independent sources.

Key Patents in Smart Grid Technology

Device for Optimizing Production, Consumption, and Storage of Electricity (US10938212B2)

A device designed to optimize the production, consumption, and storage of electricity from independent sources like solar panels without relying on the grid. The device features a hybrid inverter, load, measuring module, inter-phase power transfer module, and a PLC control system. The inter-phase power transfer module balances power between phases to match load consumption, incorporating power transistors, asymmetric output, and data connection to the PLC. The PLC coordinates the inverter, storage, and grid connection, maximizing self-consumption, minimizing grid export, and enabling grid independence.

#61 Marici Holdings The Netherlands B.V.

Headquarters: Netherlands

Marici Holdings The Netherlands B.V. focuses on modular multilevel converters for photovoltaic power plants, reducing costs and losses while improving control over voltage levels.

Key Patents in Smart Grid Technology

Photovoltaic Power Plant System with Modular Multilevel Converters (US11228178B2)

A photovoltaic power plant system that reduces costs and losses compared to conventional systems by using modular multilevel converters (MMCs) to control voltage and current in the DC collection grid. The system replaces long MV AC cables with shorter MV DC cables by having each cluster feed into a common DC bus instead of a central inverter. MMCs convert from DC to AC and connect to the grid, enabling scalable systems without cable length penalties and reducing reactive power, voltage drop, and losses. The MMCs also provide improved control over DC voltage levels compared to central inverters.

What’s Next?

The journey towards a fully realized smart grid is an ongoing evolution. While significant strides have been made, the full potential of this technology is yet to be unleashed. Continued research, development, and implementation are essential to overcome challenges such as cybersecurity, interoperability, and cost-effectiveness. 

As we move forward, the integration of emerging technologies like artificial intelligence, blockchain, and advanced materials will be crucial in unlocking the next wave of smart grid innovations.

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