上海电网中多个换流站之间相互作用的仿真研究

对于多馈入直流输电系统,交流系统的某一故障引起多个逆变站交流母线电压同时下降,可能会导致多个逆变站同时发生换相失败。以葛洲坝—南桥、三峡—华新直流输电系统与上海2010年规划电网为研究对象,通过暂态仿真,研究了两条直流输电系统的相互作用所引起的换相失败以及故障条件下直流输电系统的暂态特性。结果表明两个换流站之间有较强的耦合作用,当一个站由于交流系统短路故障发生换相失败时往往导致另一个换流站也出现换相失败。500 kV系统故障对两个换流站的影响更大。

Simulation of interactions between inverters in Shanghai Power Grid

In a multi-infeed HVDC system,one fault in the AC system of inverter side may lead to commutation failure in several inverters.The planed 2010 Shanghai grid and one dual-infeed HVDC system were used in the transient simulation to analyze the interaction between two inverters and the transient performance of the HVDC system.The results show that the interaction is so strong that one short-circuit fault occurred in the AC system of one inverter can lead to simultaneous commutation failure of the two inverters,and the fault in 500 kV system can bring stronger impact on the two inverters in comparison with the faults in the 200 kV system.