Hopewind Electric Applied for Black Start Patent Related to Wind Turbines, Wind Turbine Black Start Control, Achieving Dual-Feed Topology Grid-Connected Operation

March 26 News, according to the State Intellectual Property Office information, Shenzhen HeWang Electric Co., Ltd. has applied for a patent titled “Black Start Control System and Method for Wind Turbine Generator.” The application publication number is CN121710395A, the application number is CN202512006651.2, the publication date is March 20, 2026, and the application date is December 29, 2025. The inventors are Zhu Kanglin, Gao Jinxing, Xiong Chun, and Zhou Dangsheng. The patent agency is Shenzhen Elite Innovation Intellectual Property Agency Co., Ltd., with patent agent Huang Wenfeng. The classification codes are H02J3/40, H02J9/06, H02P9/00, H02P101/15, H02J101/28.

Patent Abstract: The invention discloses a black start control system and method for wind turbines, applied to wind turbines including a doubly-fed wind power generation topology. The system includes: a first pre-charge branch, where auxiliary power systems connect and disconnect with the bus in the doubly-fed wind power topology via the first pre-charge branch; a collaborative management unit, used to control the auxiliary power system startup and coordinate the switching of the auxiliary power system and the converter in the doubly-fed wind power topology to black start mode; a timing control logic unit, configured to control the operation of the first pre-charge branch and the switching devices in the doubly-fed wind power topology, to connect the auxiliary power system and the bus for pre-charging when the wind turbine meets black start conditions, and to disconnect the pre-charge branch and close the switching devices after the bus voltage reaches the pre-charge threshold, enabling the converter to establish the terminal voltage and achieve normal grid connection operation.

HeWang Electric was established on April 20, 2007, and listed on the Shanghai Stock Exchange on July 28, 2017. Its registered address is in Shenzhen, Guangdong Province, with office also in Shenzhen, Guangdong. The company is a leading provider of power conversion equipment and system solutions in China, focusing on core businesses such as wind power converters, with strong technical strength and high product reliability.

HeWang Electric specializes in power conversion, helping customers achieve efficient, reliable, and high-quality power generation, utilization, and transmission. It belongs to the Shenwan industry category of Power Equipment - Wind Power Equipment - Wind Power Components, involving concepts such as energy storage, offshore wind power, and wind energy.

In 2025, HeWang Electric’s revenue was 4.168 billion yuan, ranking 2nd out of 4 in the industry, below the first-place Daikin Heavy Industries with 6.174 billion yuan, slightly below the industry average of 4.198 billion yuan, and above the industry median of 4.064 billion yuan. Its main business includes new energy electronic control business accounting for 3.291 billion yuan (78.96%) and engineering transmission business at 627 million yuan (15.04%). Net profit in 2025 was 541 million yuan, ranking 2nd out of 4, below Daikin Heavy Industries’ 1.103 billion yuan, but above the industry average of 511 million yuan and median of 428 million yuan.

Recent patent applications by Shenzhen HeWang Electric Co., Ltd. are as follows:

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