Grid-Forming Inverter Technology Landscape 2026 | PatSnap Eureka
Grid-Forming Inverter Technology Landscape 2026
Grid-forming inverters autonomously establish voltage and frequency references, enabling inverter-based resources to operate without synchronous generators. As renewable penetration accelerates toward 100% inverter-based grids, GFM technology has emerged as the essential enabler for grid stability and inertia provision.
From Grid-Following to Grid-Forming: The Paradigm Shift in Power Electronics
Grid-forming (GFM) inverters present a voltage-source characteristic to the grid, autonomously synthesizing AC voltage magnitude, frequency, and phase angle without relying on a phase-locked loop (PLL). This distinguishes them fundamentally from grid-following (GFL) inverters, which operate as controlled current sources dependent on grid synchronization signals.
The field is defined by three interlocking challenges documented consistently across sources: declining system inertia as synchronous generators retire, frequency and voltage instability under high renewable penetration, and fault-ride-through (FRT) capability without rotating machines. Technical literature spans publications from 2017 to 2023, while patent filings extend to mid-2026.
Sub-domains represented in this dataset include virtual synchronous machine (VSM/VSG) control, droop-based power sharing, matching control, model predictive control (MPC) for GFM, blackstart capability, fault current management, and GFM-GFL hybrid station configuration planning. The GFM paradigm is explicitly positioned as preferred to grid-following control for providing system control and stability in converter-dominated grids.
Two geographic clusters dominate the assignee landscape: General Electric entities across GE Infrastructure Technology LLC and General Electric Renovables Espana S.L. lead the Western OEM patent space with at least 7 distinct patent documents across US, WO, EP, and IN jurisdictions, while CN filings are distributed across a large number of state-affiliated entities including EPRI China, Hunan University, State Grid Hubei, and others, reflecting China’s centralized push for GFM capability.
Three Development Phases: From Island Grids to National-Scale Deployment
Based on publication and filing dates across the retrieved results, GFM technology has evolved through three identifiable phases: a Foundational Phase (2015–2019), a Development Phase (2020–2022), and a Commercialization and Scale-Up Phase (2023–2026).
GFM Patent Filings by Control Cluster
VSM/VSG control dominates the commercial patent space, followed by virtual impedance, droop-based, and MPC/advanced digital control approaches.
↗ Click bars to exploreGFM Patent Filing Activity by Phase (2015–2026)
Filing activity accelerated sharply in the Commercialization Phase (2023–2026), with CN state-grid entities and GE filing simultaneously across multiple jurisdictions.
↗ Click bars to exploreGFM Inverter Deployment Zones: From Utility Wind/Solar to Blackstart and Microgrids
GFM technology is being deployed across five distinct application zones, each with specific control and hardware requirements documented in the retrieved patent and literature records. These span utility-scale wind and solar, microgrids, blackstart restoration, high-penetration renewable regions, and transmission-level IBR plant integration.
Utility-Scale Wind and Solar
GE Infrastructure Technology’s WO 2025 patent covers a GFM inverter-based resource that switches between “power injection mode” and “load following mode” based on real-time grid conditions. GE Renovables’ US and IN filings (2025) implement VSM-style inertial power regulators processing power error signals (PERR) to generate power angle commands applicable to wind, solar, storage, and STATCOM assets. The GFM-capable virtual power plant concept envisions aggregated renewable assets providing grid-forming services as conventional plants retire.
Utility GenerationMicrogrid and Islanded Systems
GFM inverters have a longer deployment history in microgrids, where no grid reference may be available. A 2023 laboratory verification of a 7 kW matching-controlled GFM inverter demonstrated proper operation across blackstart, steady-state, and transient modes with systematic parameter sensitivity analysis. United Technologies Corporation’s WO 2017 patent addressed GFM synchronization for UPS and backup power contexts, while 2023 literature validated decentralized P/f and Q/V droop-based operation with no external grid reference across varying PQ loads.
Microgrid / IslandedBlackstart and Grid Restoration
General Electric Renovables filed WO (2024) and IN (2025) patents describing a coordinated blackstart methodology where a subset of IBRs with GFM capability — supported by an “anchor power generating asset” — progressively form islands using coordinated voltage and frequency references. This approach brings an entire wind or solar farm back online without external grid support. Florida State University Research Foundation’s US 2025 patent addresses transient-free IBR startup using DC control throughout each switching cycle, directly relevant to GFM blackstart and reconnection scenarios.
Blackstart / RestorationHigh-Penetration Renewable Grid Regions
EPRI China’s CN 2026 patent targets 220 kV grid integration combining DSP+FPGA multi-core controllers with a layered MPC/droop strategy, coupling GFM wind turbines, GFM energy storage converters, and static VAR generators with supercapacitor modules at the station bus. State Grid Hubei’s CN 2025 patent routes wind and PV through a shared grid-side converter with GFM control to reduce cost while presenting synchronous-generator-like voltage-source behavior. A 2023 study on PMSG wind turbines in grids approaching 100% renewable penetration proposed rotor kinetic energy storage (RKES) as a GFM inertia source.
High-Penetration RenewableGFM Patent Leaders: GE Entities, EPRI China, and Emerging Asian Filers
The GFM patent space is moderately concentrated: General Electric entities (GE Infrastructure Technology LLC and General Electric Renovables Espana S.L.) dominate the Western OEM space with at least 7 distinct patent documents across US, WO, EP, and IN jurisdictions, while CN filings are distributed across state-affiliated entities including EPRI China, Hunan University, State Grid Hubei, and others.
Top GFM Patent Assignees by Document Count (2017–2026)
↗ Click bars to exploreGeneral Electric Entities
General Electric (across GE Infrastructure Technology LLC and General Electric Renovables Espana S.L.) is the most prolific named assignee in this dataset, with at least 7 distinct patent documents filed across US, WO, EP, and IN jurisdictions from 2022 to 2025. Technology coverage spans VSM-based GFM control (virtual inertia, inertial power regulator with PERR signal), virtual impedance for active power response shaping, coordinated blackstart methodology with anchor power assets, and multi-mode IBR operation with energy balance control. Key active US grants include the 2022 virtual impedance patent and the 2024 grid-forming control patent, both from GE Infrastructure Technology LLC.
United States / Spain — US, WO, EP, INChina Electric Power Research Institute
China Electric Power Research Institute (EPRI China / State Grid Electric Power Research Institute) appears with multiple CN-jurisdiction patents filed from 2023 to 2026, representing the leading Chinese state-grid entity in this dataset. Its most recent 2026 CN patent covers reactive voltage joint regulation at 220 kV substations, combining DSP+FPGA multi-core controllers with a layered MPC/droop strategy that couples GFM wind turbines, GFM energy storage converters, and static VAR generators with supercapacitor modules. This positions EPRI China at the architectural frontier for utility-scale GFM station integration in the Chinese national grid.
China — CNSix Leading-Edge GFM Innovation Directions from 2024–2026 Filings
Based on filings dated 2024–2026 in this dataset, the leading edge of GFM innovation spans hybrid GFM/GFL switching architectures, station-level reactive voltage coordination, wind-PV shared converters, multi-mode IBR energy balance, digital twin validation infrastructure, and inrush-free grid synchronization.
GFM/GFL Switchable and Hybrid Station Architectures
Multiple 2024–2025 CN patents address the challenge that neither pure GFM nor pure GFL operation is optimal across all grid conditions. Huazhong University of Science and Technology’s CN 2024 patent proposes mode switching based on real-time grid strength assessment. Huaneng Rudong Offshore Wind Power’s CN 2025 patent uses NSGA-II multi-objective optimization to determine optimal switching across stability states, targeting offshore wind plant scenarios.
Multi-Mode IBR Operation with Energy Balance Control
GE Infrastructure Technology’s WO 2025 patent introduces an energy balance control module that dynamically selects between grid-forming power injection mode and grid-forming load following mode based on grid operating conditions. This represents a step toward adaptive GFM behavior across normal and stressed grid states — directly relevant for large wind and solar plants operating under variable renewable output.
Grid-Forming vs Grid-Following Inverters: Key Technical and Strategic Differences
Click any row to explore further.
| Dimension | Grid-Forming (GFM) | Grid-Following (GFL) |
|---|---|---|
| Operational Mode | Voltage source — autonomously synthesizes AC voltage magnitude, frequency, and phase angle | Controlled current source — dependent on grid synchronization signals |
| Synchronization Method | No PLL required; voltage-angle swing behavior and output impedance shaping | Relies on phase-locked loop (PLL) to track external grid reference |
| Inertia Provision | Provides virtual inertia (J) and virtual damping (D) via VSM swing equation emulation | Does not inherently provide inertia; contributes to declining system inertia as penetration rises |
| Grid Stability Role | Preferred for providing system control and stability in converter-dominated grids (per retrieved literature) | Passive — requires existing grid voltage/frequency reference; destabilizing under high penetration |
| Fault Ride-Through | Capable of fault current management without rotating machines; blackstart capability addressable | Dependent on rotating machine references for FRT; limited standalone FRT capability |
| Power Sharing | Decentralized P/f and Q/V droop enables communication-free power sharing across multiple units | Requires coordinated dispatch or communication for multi-unit power sharing |
| Patent Filing Trend | Accelerating — 22+ documents in 2023–2026 phase in this dataset; active GE, EPRI China, KIER filings | Mature — limited new fundamental filings; focus shifting to hybrid GFM/GFL architectures |
| Hybrid / Switching | Can switch to GFL mode under strong grid conditions; NSGA-II optimization used for mode selection (CN 2025) | Can incorporate GFM-like droop features; CN 2024–2025 filings address GFL-to-GFM mode switching |
Frequently Asked Questions: Grid-Forming Inverter Technology
A grid-forming (GFM) inverter presents a voltage-source characteristic to the grid, autonomously synthesizing AC voltage magnitude, frequency, and phase angle without relying on a phase-locked loop (PLL). Grid-following (GFL) inverters operate as controlled current sources dependent on grid synchronization signals. The duality between these topologies is formally analyzed in retrieved literature, which establishes that GFM inverters are characterized by voltage-angle swing behavior and output impedance shaping, in contrast to the current-angle swing of GFL devices.
Four main control clusters are documented: (1) Virtual Synchronous Machine/Generator (VSM/VSG) control, which emulates the swing equation of a synchronous generator with virtual inertia (J) and damping (D); (2) Droop control (P/f and Q/V), enabling decentralized power sharing without communication; (3) Virtual impedance and matching control, which shapes output impedance to control power coupling and improve weak-grid stability; and (4) Model predictive control (MPC) and advanced digital control, including DC-voltage-proportional frequency command architectures for intermittent sources.
General Electric entities (GE Infrastructure Technology LLC and General Electric Renovables Espana S.L.) are the most prolific named assignee in the Western OEM space, with at least 7 distinct patent documents across US, WO, EP, and IN jurisdictions covering VSM control, virtual impedance, blackstart, and multi-mode IBR operation. In the Chinese ecosystem, EPRI China (China Electric Power Research Institute), Hunan University (2 CN patents, 2023–2024), State Grid Hubei Power Company Electric Power Research Institute (2 CN patents, 2025), and Huaneng Rudong Offshore Wind Power are among the prominent filers. Korea Institute of Energy Research holds 2 US-jurisdiction patents filed in 2025.
Blackstart capability allows a GFM inverter-based resource to restore grid power after a blackout without requiring an external energized grid. General Electric Renovables filed WO (2024) and IN (2025) patents describing a coordinated blackstart methodology in which a subset of IBRs with GFM capability — supported by an ‘anchor power generating asset’ — progressively form islands using coordinated voltage and frequency references to bring an entire wind or solar farm back online. This is identified in the dataset as a high-value differentiator, with grid operators in Australia, the UK, and the US beginning to mandate IBR blackstart capability.
Six emerging directions are identified from 2024–2026 filings: (1) GFM/GFL switchable hybrid station architectures using NSGA-II optimization (Huaneng Rudong, CN 2025); (2) Reactive voltage coordination at 220 kV substations using DSP+FPGA with layered MPC/droop (EPRI China, CN 2026); (3) GFM for wind-PV multiplexed shared grid-side converters (State Grid Hubei, CN 2025); (4) Multi-mode IBR operation with energy balance control module selecting between power injection and load following modes (GE, WO 2025); (5) Digital twin and switching-level simulation for GFM validation using Backward Euler discretization (IIT Jodhpur, IN 2026); and (6) Instant startup and inrush-free grid synchronization using DC control throughout each switching cycle (Florida State University, US 2025).
The dataset highlights several strategic considerations: GE holds the broadest commercial GFM patent portfolio in the Western hemisphere within this dataset, with multi-jurisdictional coverage including active US grants on virtual impedance (2022) and grid-forming control (2024) — entrants must assess freedom-to-operate carefully. The GFM/GFL hybrid switching paradigm represents an underexplored IP space in Western jurisdictions, as multiple CN filings from 2024–2025 address mode-switching optimization with no equivalent US or EP coverage found in this dataset. Station-level reactive voltage and frequency coordination combining GFM inverters, energy storage, and SVGs with hierarchical MPC represents the architectural frontier, with 2026 CN filings from EPRI China potentially influencing global grid codes.
Data and insights on this page are based on a limited patent and literature dataset and are for reference only. Figures may not represent the complete technology landscape.