改善多直流馈入系统稳定性的VDCOL参数优化  

VDCOL Parameters Optimization to Improve Multi-Infeed HVDC System Stability

作　　者：吕思卓[1] 杨滢[2] 郑超[1] 孙维真[2] 李晶[1] 张静[2] 

机构地区：[1]中国电力科学研究院,北京市100192 [2]国网浙江省电力公司,杭州市310007

出　　处：《电力建设》2016年第9期79-85,共7页Electric Power Construction

摘　　要：我国华东、华南等电网已形成多直流馈入受端电网格局,由于直流间强关联耦合作用,交流扰动将引发多直流同时换相失败、电压失稳等问题。该文首先分析了双馈入直流系统逆变站动态无功变化轨迹,揭示了通过优化低压限流环节(voltage dependent current order limiter,VDCOL)参数,实现降低总体无功功率需求的机理。根据换流母线抗扰动能力强弱对直流恢复特性的影响,提出了基于多馈入短路比(multi-infeed short circuit ratio,MSCR)的VDCOL参数优化方案,华东多直流馈入系统仿真结果表明,所提出的VDCOL参数优化方案降低了逆变站总体无功功率需求,提高了受端电网电压稳定性。In East China and South China power grid, it has formed the pattern that many HVDC transmission systems feed into the receiving-end grid. Because of the strong coupling of multi-infeed HVDC systems, AC voltage disturbance will lead to the commutation failure of multiple HVDC at the same time, even voltage instability. At first, this paper analyzes the inverter station dynamic reactive power change track of dual-infeed HVDC test systems, and reveals the mechanism that the optimization of voltage dependent current order limiter （VDCOL） parameters can reduce the total reactive power demand. According to the influence of resisting disturbance capacity of converter bus on DC power recovery characteristics, this paper proposes the optimization scheme of VDCOL parameter based on multi-infeed short circuit ratio （MSCR）. The simulation results of East China multi-infeed HVDC systems show that proposed optimization scheme of VDCOL parameter can reduce the reactive power demand of inverter station and improve the voltage stability of receiving end of power grid.

关 键 词：多直流馈入系统 无功特性 多馈入短路比(MSCR) 电压限流环节(VDCOL) 参数优化 

分 类 号：TM721[电气工程—电力系统及自动化]