特高压交流输电线路串联补偿合闸操作过电压研究

Close-operation overvoltage of UHV AC transmission line with series compensation

采用串联补偿能够有效地提高特高压交流输电线路的输电能力和系统的稳定性,但同时也会影响输电线路的电压特性。以中国特高压交流示范工程为背景,采用电磁暂态计算程序ATP-EMTP,对含有串联补偿装置的特高压交流输电线路的合闸操作过电压进行了计算分析。计算结果表明:加装串联补偿电容器可以降低操作过电压;串联补偿电容器的位置越靠近线路首端限压效果越好,其补偿度越大限压效果越好;采用相应的限压措施,可以将空载线路合闸过电压和单相重合闸过电压分别限制在1.34 p.u.和1.36 p.u.。

Series compensation can improve the transmission capacity of UHV AC transmission line and the stability of power systems effectively ,but it affects the voltage characteristics of transmission line. With a UHV AC power transmission project as an example,the close-operation overvohage of UHV AC transmission line with series compensation is studied based on ATP-EMTP（ElectroMagnetic Transients Program） software. Simulation results show that,series compensation capacitor may reduce operation overvoltage effectively,the nearer the series compensation capacitor is to the head end of transmission line and the greater the series compensation degree is,the better the effect of overvohage suppression is. Together with overvohage suppression measures,the energization overvoltage and single -phase reclose overvoltage can be limited to 1.34 p.u. and 1.36 p.u. respectively.