500 kV主变压器有载调压的效应指标及相关调控策略研究

变压器有载调压是维持电力系统静态电压稳定的控制手段之一，但500 kV主变压器有载调压对下层电网的影响可能造成系统电压失稳。研究有载调压时变压器档位调节对于电网无功电压和潮流分布的影响，提出变压器一档调节电压和无功效应指标以便定量衡量电网电压和无功变化。结果表明，对于分布式电源较多的地区，不宜单独进行500 kV主变压器有载调压；对于纯负荷片区或多数上网电厂为定无功运行方式的，可以考虑有载调压。

On the Effect Indicators of On-load Tap Changers of 500 kV Main Transformers and Related Control Strategy

On-load tap changer of transformers is one of effective control methods to maintain the static voltage stability of power system. But the influences in lower grid by on-load tap changing of 500 kV main transformers could cause voltage instability of system. Through the study of the impact to the reactive power voltage and power flow distribution caused by tap changing, the effect indicators about voltage and reactive power can be presented to quantitatively measuring the changes of grid voltage and reactive power. The results show that, on-load tap changing of 500 kV main changers shouldn't be adopted separatly in the area with much distributed power, nevertheless it is considerable in the area with pure load or most connected power plants operating in constant reactive power.