Sifang Co., Ltd. and two other companies jointly applied for patents related to broadband oscillation control, a method that determines the switching combination to suppress broadband oscillations and prevent their expansion.

March 24 News: According to information from the National Intellectual Property Administration, Beijing Sifang Automation Co., Ltd., State Grid Jibei Electric Power Co., Ltd. Electric Power Science Research Institute, and State Grid Corporation of China have applied for a patent titled “Wideband Oscillation Emergency Control Method Based on Machine Cut Scale and Contribution.” The application publication number is CN121710226A, application number CN202511586254.0. The application was published on March 20, 2026, and filed on November 1, 2025. Inventors include Tian Yunfeng, Zhang Bin, Wu Linlin, Liu Shu, Su Tianyu, Mei Hongming, Wang Xiao, Wang Yingying, Sun Yamin, Zhao Weihua, Ren Yina, Wu Xueli, Sheng Hong, Zhen Bao, Lu Hongbin. The patent agency is Beijing Zhihui Future Patent Agency (General Partnership), with patent agents Zhang Honglian and Zhao Qing. Classification codes include H02J3/0012, H02J3/0014, H02J3/00, H02J3/11, H02J103/30.

Patent Abstract: The wideband oscillation emergency control method based on machine cut scale and contribution includes: obtaining data of new energy systems under historical operating conditions to establish a condition knowledge base; real-time acquisition of electrical measurement data from the new energy system to determine if wideband oscillation exists; when wideband oscillation is detected at the power plant, based on real-time data under current operating conditions, determine a set of predicted operating conditions; using current and predicted conditions, retrieve and locate the most matching stable historical operating condition in the condition knowledge base; where the most matching historical stable condition’s prior state has the highest time-scale similarity with current and predicted conditions; when transitioning from current to the most matching historical stable condition, the machine cut scale is minimized, and a set of cut machine combinations is determined; based on the oscillation contribution of each unit in the cut machine set, finalize the cut machine combination as an emergency control plan to quickly suppress wideband oscillation and prevent its expansion.

Sifang Co., Ltd. was established on April 8, 1994, and listed on the Shanghai Stock Exchange on December 31, 2010. Its registered and business address is in Beijing. The company is a leading enterprise in the field of power grid automation equipment, focusing on relay protection and related products, with strong technical strength and full industry chain advantages.

Main business includes R&D, manufacturing, sales, and technical services of relay protection, power grid automation, and power plant automation products. It belongs to the industry category of Electric Power Equipment - Power Grid Equipment - Power Grid Automation Equipment, and is involved in concepts such as DC transmission, virtual power plants, and power grid equipment.

In 2025, Sifang Co., Ltd. achieved revenue of 8.193 billion yuan, ranking first among industry peers, far surpassing the second-ranked Keda Intelligent with 3.063 billion yuan, exceeding both the industry average and median (both 5.628 billion yuan). Main business revenue includes 3.826 billion yuan (46.70%) from power plant and industrial automation, and 3.679 billion yuan (44.90%) from power grid automation. Net profit in 2025 was 829 million yuan, ranking first in the industry, with the second place, Keda Intelligent, at only 85.66 million yuan, exceeding the industry average and median (both 457 million yuan).

Recent patent applications by Beijing Sifang Automation Co., Ltd. include:

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The Tianyancha data shows that the Power Science Research Institute of State Grid Jibei Electric Power Co., Ltd. was established on June 21, 2012, with Tian Yunfeng as legal representative. It is engaged in research and experimental development, with registered and office address at No. 1 Dizang’an South Lane, Xicheng District, Beijing. The institute has invested in zero enterprises, participated in 95 bidding projects, holds 0 trademark information records, 1,445 patent records, and 4 administrative licenses.

Recent patent applications include:

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The National Grid Corporation of China was established on May 13, 2003, with Zhang Zhigang as legal representative. It operates in the power and heat production and supply industry, with a large enterprise scale, registered capital of approximately 1.3045 trillion yuan, and registered address at No. 86 Xichang’an Street, Xicheng District, Beijing. It has invested in 72 enterprises, participated in 159,887 bidding projects, holds 260 trademark records, 5,000 patent records, and 47 administrative licenses.

Recent patent applications include:

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