适用于稳控装置的逆变站送出交流线路故障跳闸判据

直流换相失败给逆变站近区交流电网的故障特征带来了显著变化。理论分析了直流换相失败对逆变站送出交流故障线路的电流有效值的影响规律,指出了稳控装置所用的传统故障跳闸判据存在不适应场景的原因;进一步基于实时数字仿真平台(RTDS),验证了理论分析所述的不适应场景;通过分析直流系统短路后的交流等值网络,结合故障时电流序分量和相间余弦电压等电气量特征,提出了适应逆变站送出交流线路的故障跳闸新判据;最后,RTDS仿真结果验证了新判据的有效性和可靠性。

Fault-induced Tripping Criteria of Outgoing AC Transmission Lines in Inverter Station Applied by Stability Control Device

DC commutation failure brings significant changes to the fault characteristics of the AC grid near the inverter station. The influence of DC commutation failure on the root mean square (RMS) of current of the AC fault line in the inverter station is analyzed theoretically. The deficiency of traditional criteria applied by stability control devices is pointed out. Based on the real-time digital simulation platform (RTDS), the inadaptable scenarios described in the theoretical analysis are verified. By analyzing the AC equivalent network after the short circuit of DC system, new criteria for identifying fault-induced tripping based on current sequence component and interphase cosine voltage are proposed. RTDS simulation results show the validity and reliability of the new criteria.