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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/stability-assessment-and-inertia-monitoring-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Grid Simulation & Digital TwinStability Assessment and Inertia Monitoring Patents: Who Leads and Where the Claim Space Is Still Open
- Concentration is modest at the top. the leading five assignees together hold just 19.9% of the 1,924 records in scope, and the leading ten hold 29.9% — this is a field with a long tail, not a closed one.
- Filing has cooled from its 2017 peak. 110 records that year against 16 in the still-filling 2026 count, with a confirmed -33% swing from 97 filings in 2021 to 65 in 2024.
- Power-grid classes dominate, but drilling shows up too. H02J covers 37.3% of records while E21B (earth and rock drilling) still touches 6.7% — a sign inertia-estimation techniques have migrated into wellsite power systems.
1,924
Published Records
20%
Top-5 Share of All Records
-33%
Filing Growth 2021→2024
US
Leading Jurisdiction
Filing growth compares 2021 (97 records) with 2024 (65) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 1,924 records in scope (CR5), not by the ranked leaders only.
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What this landscape covers
This landscape tracks patent activity at the intersection of transient stability, system inertia estimation and oscillation damping, combined with the analytical methods used to screen and manage them: rate-of-change measurement, critical clearing time, modal analysis and online screening. The scope spans 1,924 published records filed between 2015 and mid-2026, drawn from receiving offices led by the United States, the European Patent Office and the WIPO PCT route.
The technology sits at a point where grid operators, protection-relay vendors and power-electronics manufacturers converge: as synchronous generation is displaced by inverter-based renewables, the tools used to detect and correct instability shift from purely electromechanical measurement toward digital estimation and control. That shift shows up in the IPC composition below, where digital processing and control classes sit alongside the traditional power-supply and protective-circuit classes.
Filing activity and technology composition, 2015-2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Stability Assessment and Inertia Monitoring covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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The Numbers
Filing trend and technology composition
Two views of the same 1,924 records: how filing activity has moved year over year, and which IPC subclasses carry the claims.
Filing trend: a 2017 peak, then a confirmed pull-back
Filings peaked at 110 in 2017. The only year-over-year comparison that is safe to state as fact is 2021 to 2024, where filings fell from 97 to 65 — a -33% change. Counts for 2025 and 2026 are still incomplete because publication lags filing by roughly 18 months, so those later years should not be read as a continued decline yet.
Technology composition across eight IPC subclasses
H02J (power supply and grid systems) anchors the field at 37.3% of the 1,924 records, with G06F (electric digital data processing) a distant second at 15.9%. G05B, H02P and G01R each sit near or just under 10%, reflecting the control, motor-drive and measurement layers that support stability assessment. E21B (earth and rock drilling) is a smaller but notable 6.7%, pointing to inertia and stability techniques applied to wellsite or oilfield power systems. Because records can carry multiple IPC codes, these shares sum to more than 100% of the record total.
Shares are the percentage of the 1,924 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on Stability Assessment and Inertia Monitoring covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
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A representative filing and the most-cited prior art
Representative Filing
US8710700B2 — Power or voltage oscillation damping in a power transmission system
ABB POWER GRIDS SWITZERLAND AG
A method, device and computer program product for providing improved control of power or voltage oscillation damping in a power transmission system. The device obtains an instantaneous magnitude of a signal representing a deviating oscillation, determines the rate of change of that signal, and integrates the instantaneous magnitudes with an integrating factor based on the determined rate of change to form a phase-compensated control output.Filed by ABB Power Grids Switzerland AG, published 2014-04-29.
Most-cited records in the corpus
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20150224845A1 | Active vehicle suspension system | 699 |
| 2 | US20080262820A1 | Real-time predictive systems for intelligent energy monitoring and management of electrical power networks | 286 |
| 3 | US5198746A | Transmission line dynamic impedance compensation system | 285 |
| 4 | US20090083019A1 | Systems and methods for intuitive modeling of complex networks in a digital environment | 248 |
| 5 | US20170046458A1 | Systems and methods for real-time DC microgrid power analytics for mission-critical power systems | 247 |
| 6 | US20140038777A1 | Resistance Apparatus, System, and Method | 225 |
| 7 | US20190332073A1 | Real-time predictive systems for intelligent energy monitoring and management of electrical power networks | 222 |
| 8 | US20090113049A1 | Systems and methods for real-time forecasting and predicting of electrical peaks and managing the energy, hea… | 218 |
| 9 | US20160196375A1 | System And Methods For Intuitive Modeling Of Complex Networks In A Digital Environment | 205 |
| 10 | US9092593B2 | Systems and methods for intuitive modeling of complex networks in a digital environment | 205 |
Citation counts are a signal of influence within this searched corpus, not a measure of current commercial relevance — older records accumulate more citations simply by being available longer.
Each row carries its publication number; clicking a row searches Eureka by that number.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Stability Assessment and Inertia Monitoring covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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What the data means for filing strategy
Three findings that shape where a new filing is likely to clear examination and where it will run into dense prior art.
Concentration
19.9% top 5
share of 1,924 records
No single assignee controls the field
The leading assignee holds 95 records and the fifth-place holder 60, but together the top five account for only 19.9% of all records in scope. That leaves the large majority of filings distributed across a long tail of single- and few-filing entrants, which is unusual for a control-and-protection technology this mature.
Ranking covers 100 assignees, counted in families.
Filing momentum
-33%
2021 to 2024 filings
Activity has pulled back from its 2017 peak
After peaking at 110 filings in 2017, confirmed activity fell from 97 filings in 2021 to 65 in 2024. Because publication lags filing by roughly 18 months, the 2025-2026 figures are still incomplete and should not yet be read as a continuing trend.
2026 count is partial due to publication lag.
Cross-domain reach
6.7%
E21B share of records
Stability techniques have reached drilling power systems
Alongside the expected grid-systems classes, 129 records (6.7% of the 1,924 in scope) sit in E21B, earth and rock drilling. This suggests inertia estimation and rate-of-change methods developed for grid stability are being re-applied to isolated or wellsite power systems.
Based on IPC subclass tagging, multi-class records included.
Eureka AI Agent
Looking for what nobody has claimed yet?
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to stability assessment and inertia monitoring, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Stability Assessment and Inertia Monitoring covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Players
Who is filing, and where the gaps sit
The ranked leaders span grid-equipment manufacturers, protection-relay specialists and software analytics firms, with co-filing activity concentrated around a small number of inventor pairs.
Leader
95
records
A single leader, without a dominant bloc
The top-ranked assignee holds 95 records, well ahead of fifth place at 60, but no coalition of assignees approaches majority share of the 1,924 records. Co-assignee activity is limited to 10 identified pairs, the strongest linking a single analytics firm to two individual inventors.
Strongest pair: 21 co-filed records.
Recent momentum
0 in latest year
several historically active filers
Several established filers show no latest-year activity
A number of assignees that built substantial portfolios over the period show zero filings in the most recent year tracked. Given the 18-month publication lag, this may reflect filings still working through the pipeline rather than an actual stop in R&D.
Momentum measured on published latest-year count.
Filing routes
675 US
of all receiving-office filings
US-centric filing, with meaningful PCT and EPO volume
The United States receives the largest share of filings at 675, ahead of the EPO at 266 and the WIPO PCT route at 181. China (122), Canada (106) and the United Kingdom (97) each carry a smaller but non-trivial share, indicating this is not a single-jurisdiction technology.
Receiving office counts, not family-adjusted.
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| EDSA MICRO CORP | 0 | — |
| General Electric Company | 0 | — |
| Schweitzer Engineering Laboratories, Inc. | 0 | — |
| Weatherford Lamb, Inc. | 0 | — |
| General Electric Technology GmbH | 0 | — |
| Weatherford Technology Holdings, LLC | 0 | — |
| POWER ANALYTICS CORP | 0 | — |
| Vestas Wind Systems A/S | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Stability Assessment and Inertia Monitoring covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
What's Next
Where to take this analysis
The published figures establish the shape of the field; the next steps depend on what decision you are making.
Screen a specific claim against this corpus
Run a candidate claim on rate-of-change measurement, inertia estimation or online screening against the 1,924 records in scope to see which prior art it sits closest to before drafting.
Search this landscape in Eureka →Track the assignees with stalled recent filings
Several historically active filers show zero records in the latest tracked year; watching their next publication cycle will show whether that reflects the publication lag or an actual pull-back.
Set up assignee monitoring in Eureka →Map the under-claimed sub-areas in more depth
Converter-driven instability and islanded-microgrid inertia estimation show thinner density than the core H02J classes; a targeted claim map of just those branches will confirm how open they actually are.
Build a sub-area claim map in Eureka →Source: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Stability Assessment and Inertia Monitoring covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
FAQ
Common questions on this landscape
The leading assignee in this dataset holds 95 of the 1,924 records in scope, with the fifth-ranked assignee at 60 and the tenth at 29. Together the top five account for 19.9% of all records and the top ten for 29.9%, which means the field has a clear leader but no dominant bloc controlling filing activity. The remaining 100-assignee ranking includes grid-equipment manufacturers, protection-relay specialists and analytics software firms, with a long tail of smaller filers behind them.
Filing activity peaked in 2017 at 110 records and has since pulled back; the confirmed comparison is a fall from 97 filings in 2021 to 65 in 2024, a -33% change. Figures for 2025 and 2026 are still incomplete because patent publication typically lags the actual filing date by around 18 months, so the most recent years always look lower than they will eventually turn out to be. Read the 2021-2024 span as the reliable signal, not the last one or two years shown in any chart.
H02J, power supply and grid systems, is the dominant class at 37.3% of the 1,924 records in scope. G06F (electric digital data processing) follows at 15.9%, with G05B (control and regulating systems), H02P (motor and generator control) and G01R (electric and magnetic measurement) each near or just under 10%. A smaller but distinct share, 6.7%, falls under E21B, earth and rock drilling, showing these techniques have been adapted for wellsite power systems as well as utility grids.
US8710700B2, assigned to ABB Power Grids Switzerland AG and published in 2014, claims a method and device for damping power or voltage oscillations by measuring the rate of change of a deviating oscillation signal and using that rate to set an integrating factor for phase compensation. It is a specific control-loop mechanism, not a claim over oscillation damping generally, so it constrains implementations that use rate-of-change-driven integration for phase compensation rather than the broader field. Anyone filing in adjacent oscillation-damping control should check their integration and rate-of-change logic against this claim language specifically.
The clearest gaps sit in sub-areas with lower density relative to the core H02J grid-systems class: converter-driven sub-synchronous oscillation detection, inertia estimation for islanded microgrids, and online critical-clearing-time screening designed to run at scale rather than as offline studies. These areas draw on the same measurement and estimation principles as the core field but apply them to newer network configurations that were less represented when the earlier wave of filings occurred. A claim map focused specifically on these branches, rather than the field as a whole, is the fastest way to confirm how open they remain.
Answers are grounded in the same dataset. Derived from a Patsnap search on Stability Assessment and Inertia Monitoring covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company's registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.