Group 1 - The State Intellectual Property Office has granted a patent for "Ultra-High Voltage Flexible DC Transmission Hybrid Converter Voltage Suppression Method and Equipment" to XJ Group Co., Ltd., XJ Electric Co., Ltd., Xi'an XJ Power Electronics Technology Co., Ltd., and State Grid Corporation of China [1] - XJ Group Co., Ltd. was established in 1996, located in Zhengzhou, with a registered capital of 3,190.395 million RMB. The company has invested in 48 enterprises, participated in 5,000 bidding projects, holds 20 trademark registrations, 5,000 patents, and has 67 administrative licenses [1] - XJ Electric Co., Ltd. was also established in 1996, located in Xuchang, with a registered capital of 1,018.62249 million RMB. The company has invested in 47 enterprises, participated in 5,000 bidding projects, holds 7 trademark registrations, 5,000 patents, and has 106 administrative licenses [1] - Xi'an XJ Power Electronics Technology Co., Ltd. was established in 2009, located in Xi'an, with a registered capital of 20 million RMB. The company has participated in 8 bidding projects, holds 428 patents, and has 7 administrative licenses [2] - State Grid Corporation of China was established in 2003, located in Beijing, with a registered capital of 130,452.014429054 million RMB. The company has invested in 72 enterprises, participated in 5,000 bidding projects, holds 183 trademark registrations, 5,000 patents, and has 47 administrative licenses [2]