HVDC Transmission for Microgrids Patent Landscape 2026
HVDC Transmission for Microgrids Patent Landscape in 2026
The HVDC microgrid patent field is in a Growth stage, expanding on a multi-year basis with recent-window activity running 31% above the prior period, though annual volume has eased from its 2020 peak. Activity is moderately concentrated, with CET Power Luxembourg SA and Varma Rajiv Kumar jointly leading, and the United States serving as the dominant filing jurisdiction.
Moderate concentration led by CET Power Luxembourg and Varma Rajiv Kumar
CET Power Luxembourg SA and Varma Rajiv Kumar share the top rank among all filers, each with 19 patent records, followed closely by Hitachi Energy Ltd at 17. The top five filers together account for 44% of the combined total across the hundred largest filers, indicating a moderately concentrated but not monopolised competitive space.
A clear tier gap separates the top three applicants from the mid-tier: University of Cape Town holds 11 patent records and Resilient Power Systems LLC and ABB (Schweiz) AG each hold 10, with the remaining ranked applicants below 10. This two-tier structure suggests that a handful of organisations have staked out systematic positions while others remain opportunistic filers.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | CET Power Luxembourg SA | 19 | |
| 2 | Varma Rajiv Kumar | 19 | |
| 3 | Hitachi Energy Ltd | 17 | |
| 4 | University of Cape Town | 11 | |
| 5 | Resilient Power Systems LLC | 10 | |
| 6 | ABB (Schweiz) AG | 10 | |
| 7 | UT Battelle LLC | 8 | |
| 8 | Caterpillar Inc | 5 | |
| 9 | The Trustees of Columbia University in the City of New York | 5 | |
| 10 | Hitachi Energy Switzerland AG | 5 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Lazaris Spyros James | 4 | |
| 12 | Delta Electronics (Shanghai) Co Ltd | 3 | |
| 13 | Alpha Technologies Ltd | 3 | |
| 14 | Ford Global Technologies LLC | 3 | |
| 15 | Lazaris Spyros J | 3 | |
| 16 | North Carolina State University | 2 | |
| 17 | Hamilton Sundstrand Corporation | 2 | |
| 18 | Alpha Technologies Services Inc | 2 | |
| 19 | National Institute of Technology Patna | 2 | |
| 20 | BAE Systems Controls Inc | 2 |
The co-presence of a commercial power-electronics firm (CET Power Luxembourg), an independent inventor (Varma Rajiv Kumar), and industrial giants such as Hitachi Energy and ABB signals that the field is contested across multiple organisational types, making it difficult for any single incumbent to foreclose the space through portfolio breadth alone.
The most recent 18–24 months of filing data are under-counted due to standard patent publication lag; apparent softness in 2025–2026 filings should not be interpreted as a real slowdown. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Multi-year growth with H02J dominance and expanding adjacent classes
The annual filing trend reveals an active but variable field, while the technology composition chart shows H02J (power supply and grid systems) as the overwhelming centre of gravity with several adjacent classes representing thinner but real secondary activity.
Annual filing trend
Annual filings show notable peaks in 2018 (19 records) and 2020 (23 records), with more moderate but sustained levels from 2022 onward. The apparent decline in 2025–2026 reflects publication lag rather than a real drop; the three-year recent window is still 31% above the prior three-year window on a multi-year basis.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H02J (power supply and grid systems) dominates with 145 patent records, reflecting that most inventions are claimed at the system-integration level. H02M (power conversion, AC/DC) is the second-largest class at 45 records, capturing converter and inverter hardware. G05B (control and regulating systems) and G06Q (business and admin data processing) each represent smaller but growing slices at 18 and 17 records respectively, hinting at increasing interest in control software and grid-economics applications.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
Transmission system for delivery of dynamic demand…
A power transmission system manages a delivery of a power requirement from multiple renewable energy resource components to an intelligent power distribution network. The transmission system includes components capable of variably and independently generating power from the multiple renewable energy resource components to provide a dynamic demand response… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Multivariable modulator controller for power gener… | 80 |
| 2 | Double synchronous unified virtual oscillator cont… | 65 |
| 3 | Renewable energy-based electricity grid infrastruc… | 51 |
| 4 | Power management utilizing synchronous common coup… | 40 |
| 5 | Power management utilizing synchronous common coup… | 34 |
| 6 | Dynamic demand response in a renewable energy-base… | 28 |
| 7 | Power system and method of operating a power system | 28 |
| 8 | Virtualization, optimization and adaptation of dyn… | 22 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
What the competitive structure means for R&D investment decisions
The combination of moderate concentration, a Growth lifecycle stage, and a US-anchored filing geography frames a field where differentiated technology positions are still achievable but require deliberate choices about application layer and jurisdiction.
Growth stage with annual volume eased from 2020 peak
The field carries a Growth lifecycle label: the recent three-year filing window is 31% above the prior three-year window, confirming sustained multi-year expansion. Annual volume peaked in 2020 at 23 records and has moderated since, but publication lag means the true recent level is understated. New entrants are still appearing, and foundational system-level claims remain contestable.
Lifecycle: GrowthTwo clear tiers with a gap below rank three
The top five filers hold 44% of the combined total among the hundred largest filers, and the top three (CET Power Luxembourg SA, Varma Rajiv Kumar, Hitachi Energy Ltd) are noticeably ahead of the mid-tier. This structure gives the leading applicants citation leverage and claim breadth, but the mid-tier gap also means a well-targeted entrant filing in an adjacent sub-class can avoid direct collision with the leaders.
Concentration: ModerateABB–Hitachi Energy axis is the only documented co-filing pair
The strongest co-filing relationship links ABB (Schweiz) AG and Hitachi Energy Switzerland AG with 7 joint patent records, followed by two smaller ABB–Hitachi Energy Ltd pairings and a 2-record Hitachi Energy Switzerland–Hitachi Energy Ltd pairing. This pattern reflects the historic ABB–Hitachi Energy corporate relationship and suggests that cross-organisation collaboration outside that axis has not yet materialised in filed patents, leaving room for university–industry partnerships.
Collaboration: Narrow axisUS-centric filings with meaningful EPO and PCT presence
The United States leads with 74 patent records, followed by Europe (EPO) at 31 and WIPO (PCT) at 25, indicating that leading applicants are pursuing broad international protection. India holds 12 records, likely driven by the University of Cape Town and individual-inventor activity. China holds only 3 records despite its large HVDC industry, which may signal either a strategic filing gap or a separate domestic corpus not captured here.
Geography: US-ledGo beyond the landscape: Eureka’s TRIZ Solution agent breaks down an R&D problem and returns patented concept solutions, each with a technical approach and cited patent & literature evidence.
| Applicant | Collaborator | Co-filings |
|---|---|---|
| ABB (Schweiz) AG | Hitachi Energy Switzerland AG | 7 |
| ABB (Schweiz) AG | Hitachi Energy Ltd | 2 |
| Hitachi Energy Switzerland AG | Hitachi Energy Ltd | 2 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
CET Power Luxembourg and Hitachi Energy lead by volume; ABB–Hitachi axis dominates co-filing
The leading applicants differ in technology emphasis: CET Power Luxembourg focuses on grid-integration (H02J), Varma Rajiv Kumar spans grid and power-conversion (H02M), and Hitachi Energy brings control systems into its portfolio alongside H02J.
CET Power Luxembourg SA
Holds 19 patent records, concentrated almost entirely in H02J (power supply and grid systems), including H02J3 and H02J9 sub-classes. Its momentum is classified as a new entrant in the recent filing window, suggesting a rapid and targeted build-up rather than a long-established portfolio. The depth in H02J positions it as a system-level integrator rather than a component specialist.
patent records: 19Hitachi Energy Ltd
Holds 17 patent records with a focus spanning H02J3, H02J13, and G05B9 (control and regulating systems), reflecting a broader technical scope than CET Power Luxembourg. Momentum is flagged as a new entrant in the recent window, consistent with Hitachi Energy’s corporate rebranding era. Together with Hitachi Energy Switzerland AG (5 records), the combined Hitachi Energy group represents a significant and technically diversified position, reinforced by the 7-record co-filing history with ABB (Schweiz) AG.
patent records: 17| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| CET Power Luxembourg SA | 1 | ▲ new entrant |
| Varma Rajiv Kumar | 3 | ▲ new entrant |
| ABB (Schweiz) AG | 2 | ▲ new entrant |
| Hitachi Energy Switzerland AG | 2 | ▲ new entrant |
| Hitachi Energy Ltd | 5 | ▲ new entrant |
| UT Battelle LLC | 8 | ▲ new entrant |
Control systems, grid economics, and solar integration are under-served adjacent branches
Several IPC classes appear in the corpus at low share relative to the dominant H02J class, identifying branches where HVDC microgrid inventive activity is sparse. These are observations of relative sparsity; their value as entry points depends on specific technical and commercial context.
G05B · Advanced control and regulating systems
With 18 patent records and a 6% share of IPC coverage, G05B is the largest adjacent branch relative to its technical relevance to HVDC microgrids. Autonomous fault detection, adaptive droop control, and model-predictive control for DC bus regulation are all G05B territory that remains sparsely claimed. The plausible entry path is software-defined control algorithms filed as method claims, which can be developed with relatively modest hardware investment and tested on existing microgrid testbeds.
Search this in Eureka →H02S · Photovoltaic and solar power generation
H02S appears in only 7 patent records (2% share), despite solar PV being one of the most common distributed sources integrated into DC microgrids. The sparsity likely reflects that solar-specific HVDC integration claims are either filed under H02J or simply not yet pursued as a distinct sub-field. An entrant with expertise in maximum-power-point tracking, DC-coupled PV-storage architectures, or bifacial module integration into HVDC bus topologies could find room to establish novel claims here.
Search this in Eureka →How leading applicants differ by technology route
Strength of each leader across the main technology routes.
| Player | H02J 3 · Power supply & grid systems | H02J 7 · Power supply & grid systems | H02M 1 · Power conversion (AC/DC etc.) | H02J 9 · Power supply & grid systems | H02J 1 · Power supply & grid systems |
|---|---|---|---|---|---|
| CET Power Luxembourg SA | Strong · 19 | Moderate · 6 | Absent | Strong · 16 | Moderate · 6 |
| Varma Rajiv Kumar | Strong · 19 | Moderate · 4 | Absent | Emerging · 3 | Absent |
| UT Battelle LLC | Strong · 8 | Absent | Absent | Absent | Strong · 5 |
| University of Cape Town | Strong · 11 | Absent | Absent | Absent | Absent |
| ABB (Schweiz) AG | Strong · 10 | Absent | Absent | Emerging · 1 | Absent |
| Hitachi Energy Switzerland AG | Strong · 9 | Absent | Absent | Emerging · 1 | Absent |
| Feng Lang | Absent | Strong · 6 | Absent | Absent | Strong · 4 |
Frequently asked questions
The corpus covers 127 patent families in scope. At the applicant-ranking level, patent records are counted, which can exceed the family total because a family may be counted under multiple IPC classes or jurisdictions.
CET Power Luxembourg SA and Varma Rajiv Kumar share the top position with 19 patent records each, followed by Hitachi Energy Ltd at 17, University of Cape Town at 11, and Resilient Power Systems LLC and ABB (Schweiz) AG each at 10.
The field is classified as Growth. The recent three-year filing window is 31% above the prior three-year window on a multi-year basis. Annual volume peaked in 2020 and has moderated since, but the most recent years are additionally understated by patent publication lag.
The United States leads with 74 patent records, followed by Europe (EPO) at 31, WIPO (PCT) at 25, and India at 12. China holds only 3 patent records in this corpus, which may reflect a separate domestic filing corpus rather than absence of Chinese R&D activity.
H02J (power supply and grid systems) dominates with 145 patent records. H02M (power conversion, AC/DC) is second at 45 records. G05B (control and regulating systems) and G06Q (business and admin data processing) follow at 18 and 17 records respectively, signalling growing interest in software control and grid-economics applications.
Yes. ABB (Schweiz) AG and Hitachi Energy Switzerland AG have the strongest co-filing relationship with 7 joint patent records. Two smaller pairings involving ABB (Schweiz) AG and Hitachi Energy Ltd, and Hitachi Energy Switzerland AG and Hitachi Energy Ltd, each account for 2 joint records. No other cross-organisation co-filing pairs are documented in the evidence.
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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.
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