调相机接入对浙江电网的影响研究

Research on the Impact of Synchronous Condenser on Zhejiang Power Grid

随着交直流混联电网的不断发展,交直流系统交互响应特性日趋复杂,引入调相机等动态无功补偿装置以提升电网稳定性已成为当前研究热点。基于浙江交直流电网基本运行特征,分析了两大特高压直流落点金华、绍兴换流站加装调相机对电网安全稳定水平的影响。分别针对交流系统故障及直流系统故障2种工况,通过对比调相机接入前后电压响应特性,分析了调相机在特高压交直流系统故障中的作用。仿真结果表明:调相机的接入有利于提高直流系统换相失败抵御能力,缩小事故中交流电网电压波动范围,提升事故后地区电压稳定水平。

With the development of hybrid AC/DC systems, the interactive influence between AC and DC systems becomes more complicated than before. Power grid stability improvement by the introduction of dynamic reactive power compensation installations like synchronous condensers has now become a hot research topic. Based on the operation characteristics of Zhejiang AC/DC power grid, the influence of synchronous condensers in Jinhua and Shaoxing converter stations on the security and stability level of power grid is analyzed.By comparing the voltage response characteristics with and without synchronous condensers in AC/DC system faults, the impacts of synchronous condensers on UHVAC/DC system faults are investigated respectively. The simulation result shows that the application of synchronous condensers is able to reduce commutation failure probability of DC system, narrow down voltage fluctuation range during accidents and improve system voltage stability after accidents.