750 kV输变电工程调试中潮流稳定和电磁暂态仿真计算研究

Research on Simulation Calculation of Power Flow Stability and Electromagnetic Transient in Commissioning of 750 kV Transmission and Transformation Project

以西北750kV主网架为例,综合运用PSD-BPA潮流程序、PSD-BPA暂态稳定程序进行仿真计算,包括电磁暂态情况与潮流稳定性等,建立8回联络线,包括4回750kV、4回330kV,潮流监视甘青断面、甘宁断面、对甘陕断面、甘新断面等,运用了麦宝Ⅰ(Ⅱ)线合环方式、东麦Ⅱ线合环方式。研究可见麦积山、兰州东空载线路运行正常,单相重合闸数值符合指标,投切750kV空载线路运行中,达到1.10p.u.最大电压值。麦积山站750kV线路投空载变压器具有1597.1A最大时励磁涌流,750kV侧中,A相电压1.27p.u.;330kV侧电压1.48p.u.。本次研究能够缩短线路调试时间,降低工程运行风险。

Taking 750 kV main grid in Northwest China as an example,PSD-BPA power flow program and PSD-BPA transient stability program are used for simulation,including electromagnetic transient and power flow stability.Eight circuits of connecting lines are established,including four 750 kV and four 330 kV.The tidal current is monitored at Ganqing section,Ganning section,DUI Ganshan section and Ganxin section.Maibao Ⅰ(Ⅱ)line looping method and Dongmai Ⅱ line looping method are used.The research shows that the Maijishan and Lanzhou East no-load lines are operating normally,and the single-phase reclosing value meets the index.During the operation of 750 kV no-load line,the maximum voltage reaches 1.10 p.u.The no-load transformer of 750 kV line in Maijishan station has a maximum inrush current of 1597.1 A.In 750 kV side,phase A voltage is 1.27 p.u.The voltage in 330 kV side is 1.48 p.u.This study can shorten the line commissioning time and reduce the project operation risk.