Yunda Share Co. Applies for Variable Pitch Power Supply Patent, Addressing Standby Power Assessment Challenges and Enhancing Wind Turbine Operation Safety

March 24 News: According to information from the National Intellectual Property Administration, Yunda Energy Technology Group Co., Ltd. has applied for a patent titled “Method, Device, and Medium for Energy Storage Analysis of Backup Power System in Pitch Control.” The application publication number is CN121710426A, the application number is CN202511975890.2, the publication date is March 20, 2026, and the application date is December 25, 2025. The inventors are Zhan Shaohui, Wang Qingfeng, Wang Qingfu, Liu Jie, Li Shihao, and Chen Yu. The patent agency is Beijing Jiajia Intellectual Property Agency Co., Ltd., with patent agent Yao Luhua. The classification codes are H02J3/466, H02J9/06, H02J101/28.

The patent abstract states: This application discloses a method, device, and medium for analyzing energy storage in a backup power system of a pitch control system; it relates to wind turbine generators and addresses the issues of lacking effective energy assessment methods for existing backup power supplies and difficulty in ensuring emergency pitch energy needs. The method first records the calibration time when the backup power is initially discharged from rated voltage to the minimum operating voltage. During operation, it repeatedly tests at preset intervals to obtain evaluation times. By calculating the ratio of these times and comparing it with a preset capacitor failure attenuation coefficient, it determines whether the energy storage meets the pitch requirement. Using the calibration time as a reference, the time ratio reflects changes in capacitor capacity, avoiding the complexity of directly measuring energy. The bus capacitor’s stable voltage ensures consistent discharge current, improving assessment reliability. It can be tested on-site with existing system components without disassembly, solving the problems of traditional large equipment that is inconvenient for on-site use, and providing early warning of failure risks to enhance wind turbine operation safety.

Yunda Co., Ltd. was established on November 30, 2001, and listed on the Shenzhen Stock Exchange on April 26, 2019. Its registered address is in Hangzhou, Zhejiang Province, with its office also located in Hangzhou. The company is a leading domestic wind turbine manufacturer with strong technical accumulation and full industry chain advantages.

Yunda’s main business involves the research, production, and sales of large wind turbines. It belongs to the Shenwan industry category of Power Equipment - Wind Power Equipment - Wind Turbines, with concept sectors including energy storage, offshore wind power, and wind energy.

In 2025, Yunda’s operating revenue was 29.402 billion yuan, ranking first in the industry, on par with the industry average and median. Of its main business, wind turbine revenue was 26.434 billion yuan, accounting for 89.90%. Net profit was 335 million yuan, also ranking first in the industry, matching the industry average and median.

Recent patent applications by Yunda Energy Technology Group Co., Ltd. are as follows:

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