同步调相机对LCC-HVDC换相失败抵御能力的影响研究

Study of impact of SC on ability to defend commutation failure of LCC-HVDC

LCC-HVDC逆变侧交流母线电压波动容易引发换相失败,同步调相机接入LCC-HVDC具有提高交流母线电压稳定性的作用,因此在一定程度上也能提高LCC-HVDC的换相失败抵御能力。本文首先从理论上分析了LCC-HVDC换相失败的机理和同步调相机提高LCC-HVDC换相失败抵御能力的机理,然后对同步调相机提高LCC-HVDC换相失败抵御能力的作用效果进行了仿真研究,在PSCAD/EMTDC软件中搭建了含有同步调相机的LCC-HVDC系统模型,从换相失败免疫性指标、换相失败概率等角度研究了不同故障类型下同步调相机对LCC-HVDC抵御换相失败能力的影响,结果表明,同步调相机可以显著提高LCC-HVDC的换相失败抵御能力。

The voltage fluctuations of AC bus in the inverter side of LCC？HVDC can readily lead to commutationfailure. If synchronous condenser could be implemented to AC bus in the inverter of LCC-HVDC, it can significantly enhance the voltage stability to a certain extent, which also improves the ability of defending LCC？HVDC commutation failure. In this paper, the mechanism leading to the commutation failure of LCC-HVDC and using synchro？nous condenser to improve the commutation failure of LCC-HVDC is analyzed theoretically, then, the effect of syn？chronous condenser on raising the ability to defend commutation failure of LCC？HVDC is studied. The model ofLCC？HVDC with synchronous condenser is developed in PSCAD/ EMTDC to study the influence of the synchronouscondenser on defending ability against commutation failure of LCC-HVDC under different fault types from the perspective of the CFII index and the probability of commutation failure index. The results show that the synchronouscondenser can significantly improve the ability to defend the commutation failure of LCC-HVDC.