Microgrid Control for Marine Power Patent Landscape
Microgrid Control for Marine Power Patent Landscape in 2026
The microgrid control for marine power patent space is extremely concentrated, with Hitachi Energy and its predecessor ABB entities collectively accounting for virtually all activity across just 15 patent families. Filing activity peaked in 2018 and has since entered a decline phase, leaving the field technically narrow but with limited ongoing competitive pressure.
Hitachi Energy and ABB dominate a compact, highly concentrated field
Hitachi Energy Ltd leads the top five filers account for 100% of the hundred largest filers’ combined total, reflecting an exceptionally tight competitive structure.
There is no meaningful second tier: all ranked applicants are either direct Hitachi Energy entities or legacy ABB entities, which are linked by the 2020 ABB Power Grids acquisition. This degree of consolidation is unusual even in specialized sub-fields and signals that one corporate lineage controls the foundational IP.
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 1 | Hitachi Energy Ltd | 11 | |
| 2 | Hitachi Energy Switzerland AG | 2 | |
| 3 | ABB (Schweiz) AG | 2 | |
| 4 | Zhenjiang College | 1 |
For any organization considering entry, this concentration implies that core grid-topology and fault-management approaches are largely pre-occupied by Hitachi Energy’s portfolio, necessitating a careful freedom-to-operate assessment before committing R&D resources to adjacent territory.
The most recent filing years are subject to standard patent publication lag of 18–24 months, so apparent zero activity in 2023–2026 should be interpreted cautiously rather than as confirmed cessation. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
A 2018 filing peak followed by sustained inactivity; grid-systems IP dominates the mix
The annual trend and technology composition charts together reveal a field that surged briefly in 2018 and has not sustained momentum, with its IP concentrated overwhelmingly in power supply and grid systems.
Annual filing trend
Filings spiked to 10 in 2018 following an initial 3 in 2017, then fell to zero in 2019–2020, briefly recovered to 2 in 2021, and have shown no recorded activity since. The lifecycle evidence confirms this as a decline phase from the 2018 peak. Years from 2024 onward remain subject to publication lag and should not be read as definitively empty.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H02J (Power supply and grid systems) is overwhelmingly the dominant IPC class, followed at a distance by H02H (Protective circuit arrangements) and G05B (Control and regulating systems). H02S (Photovoltaic/solar power generation) appears with only a single record, indicating that solar integration for marine microgrids is a sparse adjacent branch within this corpus.
↗ 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.
STEUERUNGSSYSTEM FÜR EINEN MIKRO-NETZWERK
Unique systems, methods, techniques and apparatuses of a power grid control system. One exemplary embodiment is a nested microgrid system comprising a first microgrid including a network controller, a second microgrid, a third microgrid, a first restoration path selectively coupled between a second portion of the first microgrid and the second microgrid… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Power restoration in nested microgrids | 35 |
| 2 | Fault detection and location in nested microgrids | 3 |
| 3 | 船用光伏智能微网供电系统 | 3 |
| 4 | Nested microgrid control system | 2 |
| 5 | Power restoration in nested microgrids | 2 |
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 patent structure means for R&D investment decisions
Four structural dimensions — maturity, concentration, collaboration patterns, and geographic reach — each carry distinct implications for teams evaluating entry or expansion in marine microgrid control.
Field in decline after a brief 2018 peak
The lifecycle stage is classified as Decline, with annual filings easing back from the 2018 peak of 10 and no recorded activity in subsequent years. This suggests that the initial wave of foundational IP in nested-microgrid topology and fault management has been filed, and no new wave of innovation has yet materialized. R&D teams should assess whether the decline reflects market saturation, slow commercialization, or an opportunity gap waiting for next-generation marine electrification to drive renewed filing.
Lifecycle: DeclineSingle corporate lineage holds essentially all IP
The top five filers account for 100% of the hundred largest filers’ combined total, and all ranked applicants trace to either Hitachi Energy or legacy ABB. This leaves virtually no white space in the core H02J grid-systems domain and creates significant freedom-to-operate exposure for new entrants. Organizations outside this lineage would need to design around existing nested-microgrid and fault-detection claims or focus on unclaimed adjacent branches.
High concentrationABB and Hitachi Energy entities co-filed extensively before the acquisition
The most active co-filing relationships recorded are between Hitachi Energy Switzerland AG and ABB (Schweiz) AG (4 joint families each pairing), reflecting the transition period around the ABB Power Grids acquisition. Individual inventors including Mondal Abrez, Kondabathini Anil, Ishchenko Dmitry, and Hong Junho each appear as co-filers with ABB (Schweiz) AG on 2 families, indicating a small core inventor team rather than a broad collaborative ecosystem. No external academic or cross-industry co-filing patterns are evident beyond Zhenjiang College’s single independent family.
Intra-corporate co-filingAustralia and EPO lead; limited Asia-Pacific and US coverage
Australia and Europe (EPO) are tied as the leading jurisdictions with 4 patent records each, followed by the United States with 3 and WIPO PCT with 2. China has only 1 record, and Germany and Spain each have 1. The Australian lead is notable given the country’s offshore energy infrastructure interests. The limited US and Chinese coverage relative to those markets’ marine electrification activity may indicate jurisdictional gaps worth monitoring.
Australia & EPO leadGo 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 Power Grids Switzerland AG | Hitachi Energy Switzerland AG | 4 |
| ABB Power Grids Switzerland AG | Hitachi Energy Ltd | 4 |
| Hitachi Energy Switzerland AG | Hitachi Energy Ltd | 4 |
| ABB (Schweiz) AG | Hitachi Energy Switzerland AG | 2 |
| ABB (Schweiz) AG | Hitachi Energy Ltd | 2 |
| ABB (Schweiz) AG | ABB Power Grids Switzerland AG | 2 |
| MONDAL ABREZ | ABB (Schweiz) AG | 2 |
| KONDABATHINI ANIL | ABB (Schweiz) AG | 2 |
| ISHCHENKO DMITRY | ABB (Schweiz) AG | 2 |
| HONG JUNHO | ABB (Schweiz) AG | 2 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Hitachi Energy and its ABB predecessor entities define the competitive map
All ranked applicants in this space belong to the Hitachi Energy / ABB corporate lineage, making this effectively a single-player field post-acquisition. Their technology emphasis is tightly focused on grid-systems and protective-circuit IP.
Hitachi Energy Ltd
Hitachi Energy Ltd holds 11 patent families, the largest position in this corpus by a wide margin. Its technology emphasis is concentrated in H02J 3 (power supply and grid systems) and H02H 7 (protective circuit arrangements), with additional coverage in G05B 15 (control and regulating systems). No applicant momentum data is available for the recent period, consistent with the field’s post-2018 decline. The position reflects accumulated IP from the ABB Power Grids portfolio transferred at acquisition.
families: 11ABB (Schweiz) AG
ABB (Schweiz) AG holds 2 patent families and, as the parent Swiss entity, was the most technically diversified filer in the pre-acquisition period — its applicant technology profile spans H02J 3, G05B 15, and H02H 7, reflecting the breadth of the original ABB marine microgrid program. Post-acquisition, this entity’s independent filing activity has ceased, with its portfolio now functionally consolidated under Hitachi Energy. No recent momentum data is available.
families: 2Solar integration and advanced control systems are under-served adjacent branches
Within this small corpus, H02S (Photovoltaic/solar power generation) appears as a sparse branch with only one patent record, while G05B (Control and regulating systems) has limited coverage relative to the dominant H02J class — both represent observations of relative sparsity rather than confirmed commercial opportunities.
H02S · Photovoltaic / solar power generation for marine microgrids
H02S accounts for a single patent record in this corpus, representing approximately 4% of total IPC records — the lowest share of any class present. The sole filer in this branch is Zhenjiang College, which also covers H02J 7 and H02S 10 in its single family. Offshore and coastal vessels increasingly integrate solar panels as auxiliary generation, and the combination of solar MPPT control with marine microgrid management is technically plausible. Any entrant would need to establish whether the sparsity reflects a genuine IP gap or simply that the relevant filings sit in adjacent corpora under broader renewable-marine search strategies.
Search this in Eureka →G05B · Advanced control and regulating systems for marine microgrids
G05B (Control and regulating systems) has 3 patent records in the corpus, all attributed to ABB (Schweiz) AG’s applicant technology profile. This class covers model-based and programmable control approaches that could underpin next-generation autonomous ship energy management systems. Given the field’s decline and the absence of non-Hitachi/ABB filers in this branch, there may be room for new entrants — particularly those combining G05B control architectures with AI-driven energy optimization — to establish positions without immediate freedom-to-operate conflict, though a full claim-level review remains necessary before drawing that conclusion.
Search this in Eureka →How Hitachi Energy entities and ABB differ by technology route
Strength of each leader across the main technology routes.
| Player | H02J 3 · Power supply & grid systems | H02H 7 · Protective circuit arrangements | G05B 15 · Control & regulating systems | H02J 7 · Power supply & grid systems | H02S 10 · Photovoltaic / solar power generation |
|---|---|---|---|---|---|
| ABB (Schweiz) AG | Strong · 9 | Moderate · 2 | Moderate · 3 | Absent | Absent |
| ABB Power Grids Switzerland AG | Strong · 6 | Moderate · 2 | Absent | Absent | Absent |
| Hitachi Energy Ltd | Strong · 5 | Emerging · 1 | Absent | Absent | Absent |
| Hitachi Energy Switzerland AG | Strong · 5 | Emerging · 1 | Absent | Absent | Absent |
| Zhenjiang College | Strong · 1 | Absent | Absent | Strong · 1 | Strong · 1 |
Frequently asked questions
The corpus contains 15 patent families in scope. This is a notably small corpus, reflecting the niche intersection of microgrid control technology and marine power applications.
Hitachi Energy Ltd is the leading applicant with 11 patent families. All other ranked applicants — Hitachi Energy Switzerland AG, ABB (Schweiz) AG, and Zhenjiang College — are either corporate entities within the same post-acquisition group or a single independent academic institution.
Filing activity peaked in 2018 with 10 recorded families in that year, following 3 in 2017. Activity dropped to zero in 2019–2020, recovered briefly to 2 in 2021, and has shown no recorded filings since. The field’s lifecycle is classified as Decline.
Australia and Europe (EPO) each have 4 patent records, followed by the United States with 3 and WIPO PCT with 2. China, Germany, and Spain each have 1. Australia’s lead is notable relative to the size of its marine energy infrastructure market.
H02J (Power supply and grid systems) dominates with 16 patent records, followed by H02H (Protective circuit arrangements) with 6 and G05B (Control and regulating systems) with 3. H02S (Photovoltaic/solar power generation) has only 1 record and represents the sparsest adjacent branch observed in the corpus.
The most active co-filing pairs are ABB (Schweiz) AG with Hitachi Energy Switzerland AG, ABB (Schweiz) AG with Hitachi Energy Ltd, and Hitachi Energy Switzerland AG with Hitachi Energy Ltd — each pair sharing 4 joint families. These collaborations reflect the corporate transition period around the ABB Power Grids acquisition rather than external ecosystem partnerships.
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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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