Detection method suitable for commutation failure of high-voltage direct-current transmission

• Main Authors: WU YUANMI, ZHU XIAOHONG, LI ZHANGYONG, WANG HAOMING, ZHENG LEI, SHI HANG, SONG XINYUAN, TAN SONGYI, DU JIANHUA, XING CHAO, WANG GUOZHONG, LI YINAN, HUI SHIXIAN, SI CHENGZHI
• Format: Patent
• Language: Chinese; English
• Published: 05.04.2024
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention provides a commutation failure detection method suitable for high-voltage direct-current transmission, which belongs to the technical field of electric power, and comprises the following steps: extracting a direct-current signal at an inverter side, performing S transformation on the direct-current signal to obtain a complex time-domain matrix S, calculating a direct-current sudden increment di/dt, performing modulo calculation on each element in the matrix to obtain a modular time-domain matrix D, decomposing the matrix D to obtain a diagonal matrix V, and performing phase inversion on the diagonal matrix V; elements on a main diagonal line of the diagonal matrix V form a set, a singular value of the mode time domain matrix D is obtained, and S transformation singular entropy SSE is obtained according to the definition of entropy; only when the S transformation singular entropy SSE is larger than SSEres and the direct current suddenly increases, namely di/dt is larger than 0, it is judged that