H02P 9/007
Control circuits for doubly fed generators
Official title: {Control circuits for doubly fed generators}
H02P9/007 (Control circuits for doubly fed generators) appears on 385 US grants and 404 published applications in this corpus.
Search patents in H02P- Granted patents
- 385
- Published applications
- 404
- Assignees
- 129
- Inventors
- 709
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 4 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 3 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 2 | 2 |
| 2003 | 2 | 2 |
| 2004 | 2 | 4 |
| 2005 | 6 | 10 |
| 2006 | 6 | 8 |
| 2007 | 9 | 13 |
| 2008 | 11 | 14 |
| 2009 | 8 | 21 |
| 2010 | 10 | 13 |
| 2011 | 18 | 33 |
| 2012 | 21 | 12 |
| 2013 | 13 | 24 |
| 2014 | 22 | 18 |
| 2015 | 15 | 22 |
| 2016 | 18 | 22 |
| 2017 | 19 | 13 |
| 2018 | 29 | 34 |
| 2019 | 22 | 33 |
| 2020 | 38 | 22 |
| 2021 | 16 | 16 |
| 2022 | 20 | 22 |
| 2023 | 15 | 20 |
| 2024 | 25 | 14 |
| 2025 | 15 | 5 |
| 2026 | 2 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Method for operating a wind turbine and wind turbine3 Feb 2026US 12,540,599 B2Ingenieurbuero Hoffmann GmbH
- Wind power facility and method23 Dec 2025US 12,506,427 B2Siemens Gamesa Renewable Energy Innovation & Technology S.L.
- Electrical machine16 Dec 2025US 12,500,488 B2Hamilton Sundstrand Corporation
- System and method for detecting bearing insulation and ground brush health in a generator2 Dec 2025US 12,487,269 B2GE Vernova Infrastructure Technology LLC
- Controlling a wind turbine during low voltage events24 Sep 2026US 2026/0286936 A1Siemens Gamesa Renewable Energy Innovation & Technology S.L.
- Stator-rotor protection for multi-phase wound-rotor machines24 Sep 2026US 2026/0291211 A1Schweitzer Engineering Laboratories, Inc.
- Operating a wind turbine to provide reactive power23 Jul 2026US 2026/0213682 A1Seimens Gamesa Renewable Energy Innovation & Technology S.L.
- System and method for extending the operating speed threshold of a grid-forming inverter-based resource9 Jul 2026US 2026/0196832 A1General Electric Renovables Espana, S.L.
- Method for determining capacity of energy storage apparatus for new energy support machine, and new energy support machine21 May 2026US 2026/0140154 A1
Most cited
By later US patents
- Performance optimization controller and control method for doubly-fed machines427US 5,798,631 AState of Oregon acting by and through the State Board of Higher Education on behalf of Oregon State University · 1998
- Variable speed wind turbine having a matrix converter159US 6,566,764 B2Vestas Wind Systems A/S, R&D · 2003
- Variable speed wind turbine generator with zero-sequence filter141US 5,798,632 AMidwest Research Institute · 1998
- Variable speed wind turbine generator140US 6,137,187 AZond Energy Systems, Inc. · 2000
- Variable speed wind turbine generator102US 6,420,795 B1Zond Energy Systems, Inc. · 2002