Transient voltage stability of Sichuan power gird is a problem caused by a serious malfunction when load center is simultaneously received from internal high power supply and external gird.In addition,HVDC feed-in will further deteriorate transient voltage stability of Sichuan power gird.Focus on this problem,an evaluation index of transient voltage stability is firstly proposed considering penalty function and operation mode of all nodes with all faults,which can automatically quantify the factors affecting the operation mode,and support the realization of automatic search and compilation reasonable bad operation mode.Secondly,the mechanism of transient voltage stability in Sichuan power gird is revealed,that is caused by large range surge of huge blocking power after AC failure occurred in the mode of power supply and load power consumption.The two root causes for decreasing transient voltage stability in Sichuan power gird are mainly analyzed,that is,the increasing of receiving ratio in load center caused by Deyang-Baoji HVDC feed-in operation and the weakening of dynamic voltage support capacity.Finally,the measures including optimizing HVDC control parameters are presented to improve the transient voltage stability of Sichuan power gird,which can provide a reference for the security and stability analysis of similar angle-voltage intertwined power grid.
关键词
送端电网/馈入直流/大规模外送/暂态电压稳定/量化评估指标/低压限流
Key words
sending-end power grid/HVDC feed-in/large capacity delivery/transient voltage stability/quantitative evaluation index/voltage dependent current order limiter(VDCOL)
维普
万方数据