基于ATP-EMTP对500kV输电线路取消合闸电阻的仿真研究

Simulation Research on Eliminating Parallel Resistor in Circuit Breaker for 500 kV Transmission Lines Based on ATP-EMTP

以500 kV输电线路空载线路投切操作过电压为研究对象,利用电磁暂态计算程序(ATP-EMTP),分别对合闸电阻,高性能避雷器对三相同期合空载线路过电压抑制效果进行仿真研究,从合闸电阻两端电压差,避雷器安装位置和吸收能量能力等几个方面讨论了避雷器取代合闸电阻实现的可能性,对500 kV输电线路操作过电压的防护方案进行优化。仿真结果表明,对于不存在高压电抗的500 kV线路采取避雷器取代合闸电阻,两端加装避雷器的同时在线路中加装一组避雷器的防护方案,抑制过电压的效果比较好,同时提高线路断路器的操作可靠性,进而提高系统可靠性和经济效益。

The no-load circuit 500 kV transmission line switching overvoltage was taken as the object to be studied, with the electromagnetic transient program ATP-EMTP, the no-load line switching overvoltage on the same period of switch was simulated and studied by using high performance metal oxide arrester or parallel resistor in circuit breaker. The possibility of eliminating closing resistors of 500 kV circuit breakers replaced by MOA was discussed from the aspects of voltage difference across the closing resistor, the installation position for MOA and the energy absorption capability of MOA, and the switching overvoltage protection program for 500 kV transmission line was optimized. Simulation resuits showed that, for the 500 kV lines with no high voltage reactance, the protection method that install a group of MOA on the line while install MOA at both ends of the resistance in circuit breakers, its effect of restraining over-voltage was better, while improving the operating reliability of the line circuit breaker was enhanced, and then the system reliability and economic benefits were improved.