Abstract：The commutation failure of converters is a type of common faults in DC transmission system when faults of AC system occur. As filter commutated converter (FCC) is a new converter circuit topology structure, it’s necessary to research commutation characteristics of FCC under the conditions of AC system’s faults. Firstly, the actual extinction angle is calculated under the conditions of symmetrical and unsymmetrical AC three-phase faults; and the relationship between the commutation voltage reduction, the extinction angle, DC current and zero-crossing phase shift are researched. Further, based on the mathematical model of FCC, the influence of compensation factor at the valve side on the extinction angle, commutation angle, commutation voltage and commutated reactance is analyzed in detail. In the last, referring to the parameters of back-to-back DC transmission system in the lab, the simulating results are contrastively researched between FCC and LCC under the conditions of AC system faults, which indicated that the inverter is more inclined to occurring commutation failure under single phase fault than three phase symmetrical fault; for the harmonics in the commutation voltage of FCC is less than in the LCC, FCC can load more commutation voltage reduction, but when selecting the compensation factor at the valve side, the commutation failure and commutated reactance must both be taken into account.
许加柱, 罗隆福, 李季, 赵志宇, 邵鹏飞. 交流系统故障对滤波换相换流器的影响分析[J]. 电工技术学报, 2010, 25(1): 144-150.
Xu Jiazhu, Luo Longfu, Li Ji, Zhao Zhiyu, Shao Pengfei. Analysis of the Impact of AC System Faults on Filter Commutated Converter in HVDC. Transactions of China Electrotechnical Society, 2010, 25(1): 144-150.
2010, Vol. 25 
