超高压混合串补线路瞬态恢复电压暂态特性

混合串联补偿对输电线路暂态特性的影响亟待研究。为研究串联补偿混合复用对瞬态恢复电压(transient recovery voltage, TRV)暂态特性的影响，以500 kV超高压示范工程线路为研究背景，利用PSCAD/EMTDC建立可控串补与固定串补的电磁暂态仿真平台，分析系统发生单相接地故障时瞬态恢复电压变化规律，得到恢复电压上升率与短路电流变化曲线；采用对比分析方法，针对可控串补与固定串补不同配置方式，研究不同串补度对TRV特性的影响，并得出最佳串补配比。仿真表明：相比固定串联补偿(fixed series capacitor compensation, FSC)双平台分段布置，系统采用可控串联补偿(thyristor controlled series compensation, TCSC)与FSC混合复用时，TRV超标工况大幅增加；合理配置TCSC+FSC线路串补度，能够有效降低TRV与断路器短路电流，且能够满足断路器正常开断的国家标准。

Study on TRV Transient Characteristics of Extra High Voltage Hybrid Series Compensated Line

The influence of hybrid series compensation on transient characteristics of transmission lines needs to be studied. In order to study the influence of series compensation hybrid multiplexing on the transient characteristics of TRV, the 500kV ultra-high voltage demonstration project line is taken as the research background. The electromagnetic transient simulation platform of controllable series compensation and fixed series compensation is established by PSCAD/EMTDC. The transient recovery voltage variation law is analyzed when single-phase ground fault occurs in the system, and the recovery voltage rise rate and short-circuit current change curve are obtained. The comparative analysis method is adopted. For different configurations of controllable series compensation and fixed series compensation, the influence of different series compensation degrees on TRV characteristics is studied, and the optimal series compensation ratio is obtained. The simulation results show that compared with the FSC dual-platform segmented layout, the TRV exceeding condition is greatly increased when the system adopts TCSC and FSC hybrid multiplexing. Reasonable configuration of TCSC + FSC line series compensation, TRV and circuit breaker short-circuit current can be effectively reduced, and the national standard for normal breaking of circuit breakers can be met.