Analysis of the commutation failure of inverters during open-conductor faults at the AC side

作者：Cheng, Jingzhou^*; Xue, Yinglin; Guan, Minyuan; Wang, Chao

来源：International Transactions on Electrical Energy Systems, 2015, 25(8): 1570-1589.

DOI：10.1002/etep.1919

• high-voltage direct current (HVDC)
• open-conductor fault
• phase opening
• multi-terminal DC (MTDC)
• commutation failure

Commutation failures (CFs) in inverter stations disturb the power system greatly. Open-conductor fault (OCF) is a longitudinal fault. When it occurs in the alternating current (AC) system, the three-phase voltages are unbalanced. Under this circumstance, it is generally considered that inverters can maintain normal commutation order for the voltage support provided by other transmission lines in normal operation. In this paper, the possibility of the inverter CF during OCF is established. The sensitivities of the CF to the AC voltage disturbances caused by the changes of the AC superposition voltage are analyzed. It is concluded that the sensitivities of the CF with different transformer wiring schemes and fault types are diverse. Before the CF happens in the inverter station during OCF, the CF may occur in other inverter stations of the multi-terminal direct current systems with the constant current and constant extinction angle control strategies. Simulation studies are performed in

• 出版日期2015-8
• 单位浙江大学