可控型混合无功补偿对瞬态恢复电压影响研究

The influence of controllable hybrid reactive power compensation on transient recovery voltage

可控型混合无功补偿(hybrid reactive power compensation,HRPC)对输电线路暂态特性的影响亟待研究。在分析可控型混合无功补偿结构功能的基础上,以晋东南-南阳-荆门特高压示范线路为背景,建立特高压混合无功补偿线路单相接地故障等效模型,研究可控串联补偿+可控并联电抗器(thyristor controlled series compensation+thyristor controlled transformer,TSCT+TCT)混合无功补偿对断路器开断特性的影响。基于拉氏变换和等值参数集中电路,分析瞬态恢复电压(transient recovery voltage,TRV)影响因素,得出瞬态恢复电压随可控型混合无功补偿度变化规律。利用PSCAD/EMTDC,研究安装可控型混合无功补偿前后对瞬态恢复电压的影响,验证分析方法的有效性。结果表明:随着可控型混合无功补偿度的增加,TRV峰值和上升率R RRV不断增大,而TCT对瞬态恢复电压影响较小。

The paper studies the influence of controllable hybrid reactive power compensation(HRPC)on the transient characteristics of transmission lines.Based on an analysis of the structure-function of controllable hybrid reactive power compensation,and considering the Jindongnan-Nanyang-Jingmen UHV demonstration line,an equivalent model of a single-phase ground fault of a UHV hybrid reactive power compensation line is established,and the influence of TCSC+TCT controllable hybrid reactive power compensation on the breaking characteristics of the circuit breaker is studied.Based on the Laplace transform and equivalent parameter concentration circuit,the influence factors of transient recovery voltage(TRV)are analyzed,and the variation rule of TRV with compensation degree of controllable hybrid reactive power compensation is obtained.Using PSCAD/EMTDC,the effect of the controlled hybrid on the TRV is studied,and the validity of the analysis method is verified.The results show that the TRV peak and RRRV increase with the increase of compensation degree of controlled HRPC;TCT has little effect on transient recovery voltage.