云广±800kV直流低负荷无功优化功能运行分析

Analysis of Yunnan-Guangdong ±800 kV DC System Operation Enabling Its Low Load Reactive Power Optimization Function

直流输电系统的低负荷无功优化功能是换流站进行无功补偿和电压控制的一种重要手段。分析了云广±800kV直流低负荷无功优化功能的运行情况,计算直流系统对楚雄换流站附近厂站注入的无功功率及分析其所致的电压灵敏度。结果显示,直流低功率时低负荷无功优化功能可以有效地减少直流向交流系统注入无功功率,改善系统电压水平,丰富电压调控手段。进而对云广±800kV直流低功率解锁时的相关调度调控提出了建议,并对南方电网其他一些高压直流系统开放低负荷无功优化功能的必要性进行了探讨。

The low load reactive power optimization function （LLRPO-function） of DC power transmission systems plays a quite important role in reactive power compensation and voltage regulation.This paper analyzes Yunnan-Guangdong ±800 kV DC system operation enabling its LLRPO-function,and calculates the amount of reactive power injected into the nearby generation plants and substations,and analyzes the bus voltage sensitivity due to the injection.The results show that the LLRPO-function can significantly reduce the reactive power injection from the low load DC system into the AC system,improve the system voltage level and enrich the means of voltage regulation.Furthermore,certain suggestions for dispatching and operation of the DC systems are presented,and the necessity enabling the LLRPO-function of other DC systems in China Southern Power Grid was discussed.