Group 1 - Beijing Sifang Automation Co., Ltd. and Beijing Sifang Engineering Technology Co., Ltd. have applied for a patent titled "A Method for Building an Electromagnetic Transient Equivalent Model of Wind Turbines Reflecting Energy Balance Transfer" [1] - The patent aims to accurately reflect the energy balance transfer process from wind energy captured by the turbine blades to electrical energy, enhancing simulation efficiency while ensuring accuracy [1] - The method includes controlled current source modules and controlled voltage source modules to describe energy transfer processes, and it determines the fundamental frequency amplitude based on wind turbine control strategies [1] Group 2 - Beijing Sifang Automation Co., Ltd. was established in 1994, located in Beijing, with a registered capital of 832.251 million RMB, primarily engaged in the manufacturing of computers, communications, and other electronic devices [2] - The company has invested in 21 enterprises, participated in 5,000 bidding projects, and holds 1,662 patents along with 42 trademark registrations [2] - Beijing Sifang Engineering Technology Co., Ltd. was founded in 2003, also located in Beijing, with a registered capital of 1,050 million RMB, focusing on the manufacturing of instruments and meters [2] - This company has invested in 5 enterprises, participated in 5,000 bidding projects, and holds 779 patents along with 13 administrative licenses [2]