US 12,283,821 B2
Control method and apparatus for high-voltage, direct current first commutation failure in alternating-current fault
Chuang Fu, Guangdong (CN); Ruina Zheng, Guangdong (CN); Juanjuan Wang, Guangdong (CN); Zhaoxin Wen, Guangdong (CN); Huan Li, Guangdong (CN); and Wei Wei, Guangdong (CN)
Assigned to ELECTRIC POWER RESEARCH INSTITUTE. CHINA SOUTHERN POWER GRID, Guangdong (CN); and CHINA SOUTHERN POWER GRID, Guangdong (CN)
Appl. No. 18/552,666
Filed by ELECTRIC POWER RESEARCH INSTITUTE. CHINA SOUTHERN POWER GRID, Guangdong (CN); and CHINA SOUTHERN POWER GRID, Guangdong (CN)
PCT Filed Sep. 13, 2021, PCT No. PCT/CN2021/118052
§ 371(c)(1), (2) Date Sep. 27, 2023,
PCT Pub. No. WO2022/205786, PCT Pub. Date Oct. 6, 2022.
Claims priority of application No. 202110352380.5 (CN), filed on Mar. 31, 2021.
Prior Publication US 2024/0162714 A1, May 16, 2024
Int. Cl. H02J 3/36 (2006.01); H02J 3/00 (2006.01); H02M 7/48 (2007.01)
CPC H02J 3/36 (2013.01) [H02J 3/001 (2020.01); H02M 7/48 (2013.01); H02J 2203/00 (2020.01)] 10 Claims
OG exemplary drawing
 
1. A method for suppressing a first high-voltage direct-current (HVDC) commutation failure under an alternative current (AC) system fault, applied to an HVDC transmission system, the method comprising:
obtaining a three-phase voltage of a converter bus in the HVDC transmission system, and calculating a zero-sequence component amplitude and an αβ component amplitude of the three-phase voltage of the converter bus;
obtaining a setting value of an extinction angle of the HVDC transmission system, a per unit value of a short-circuit reactance of a converter, a per unit value of a DC current, a commutation time and an impedance ratio, and calculating a first trigger-angle command for a single-phase fault and a second trigger-angle command for a three-phase fault according to the zero-sequence component amplitude and the αβ component amplitude;
selecting a smaller one of the first trigger angle command and the second trigger angle command as a trigger-angle command for an extinction-angle controller controlling a converter valve in the converter; and
adjusting a trigger angle of the HVDC transmission system by using trigger-angle command for the extinction-angle controller as an upper limit value for an output of the extinction-angle controller of the HVDC transmission system.