线路变压电抗器作为500kV及特高压线路并联电抗器的解决方案

超高压及特高压线路采用欠补偿方式来配置线路并联电抗器,结果系统在小方式下无功功率过剩,大方式下无功功率不足。文章提出采用线路变压电抗器方案解决并联电抗器的存在问题。线路变压电抗器是一个由变压器,低压电抗器及小电流电抗器组成的无功补偿系统,连接在超高压或特高压线路侧。该方案可以达到分级可控电抗器的效果,实现零补偿至过补偿的可控方式,并可以减少变电站站内低压电容器、电抗器补偿装置及主变压器低压第三绕组的数量。

The Shunt Transformer-Controllable Reactor as a Solution for 500 kV and UHV Transmission Line Shunt Reactor

The 500 kV or UHV transmission line shunt reactors are deployed with an under-compensation method, resulting in a problem that there is excessive reactive power for the power system in its small operation mode, but insufficient in its large operation mode. This problem is proposed to solve with a solution of shunt transformer-controllable reactor, which is a reactive compensating facility consisting of transformer, low voltage reactor bank and transformer nature small current reactor, and connected to the EHV or UHV transmission line site. The solution can reach the grade control purpose of controllable reactors, and realize zero to over compensation-controllable mode, and reduce the number of low voltage capacitors, reactor compensating facilities as well as the third windings of main transformers in substations.