交流特高压输电线路的工频过电压及其抑制

随着传输距离的进一步增加和传输容量的增大,特高压工频过电压问题更加严重,抑制措施较难实施。对特高压工频过电压进行简要分析并介绍其影响因素。提出采用快速励磁式磁控电抗器抑制特高压工频过电压的方法,并对快速励磁式磁控电抗器的结构进行介绍。指出采用固定电抗和快速磁控电抗器串联的方式来对特高压系统进行补偿,并对补偿效果进行了全面数值仿真计算,结果表明特高压系统的工频过电压能够限制在一个较稳定水平。此外,通过动态调节其无功容量还可以非常有效地稳定线路电压,在特高压系统中的应用前景广阔。

Power Frequency Overvoltage Suppression of UHV AC Transmission Line

The power frequency over-voltage of ultra-high voltage （UHV） is more serious along with the increase of the transmission distance and transmission capacity, and the over-voltage suppression methods are more difficult to be implemented.The power frequency overvohage of UHV is briefly introduced and its influencing factors are analyzed in this paper.The magnetic controllable reactor in suppressing power frequency overvohage is recommended, and the structure of the reactor is introduced.Then, we compensate for UHV system by using fixed reactors and fast magnetic controllable reactor in series, and simulate the compensation effect, and prove that the power frequency overvoltage could limit at a stable level.The voltage of the transmission line can be stabilized through dynamically modulating the compensation capacity of the reactor.The magnetic controllable reactor can be applied widely in UHV system.