二滩电站枯水期无功经济运行策略研究

Research of Reactive Power Economic Operation Strategy for Ertan Hydropower Plant in Withered Water Period

枯水期,电网负荷轻,线路充电无功过剩,线路负荷侧电压偏高,需要机组深度进相调整电压,特别在低谷负荷段,二滩水电站往往需要开额外的机组,造成耗水率增加,降低了经济运行水平。目前,电网已启动并网发电厂辅助服务及运行管理考核工作,对基本无功调节提出考核要求,同时对额外无功调节进行补偿。针对当前实施辅助服务的新形势,统计分析枯水期低谷负荷段的无功电压变化规律,在保证电网和电厂安全稳定运行的前提下,提出二滩电站枯水期无功经济运行策略,以达到降低耗水率、提高运行效益的目的。

In withered water period,the load of power grid is low,the charging reactive power of line is superfluous,so the generator needs leading phase operation deeply to adjust the system voltage,especially in low load periods,Ertan Hydropower Plant often needs opening additional units,which results in the increasing water consumption rate and the reduction of economic operation level.Now,the power grid has started the grid-connected power plant auxiliary services and operation management assessment,the evaluation requirements are proposed for the basic reactive power regulation,and the additional reactive power regulation is compensated.According to the new situation of auxiliary services,the variation rules of reactive power in valley period of load in withered water period are analyzed,and in order to ensure the stable and safe operation of power grid and power plant,the strategies of reactive power economic operation in withered water period for Ertan Hydropower Plant are proposed so as to decrease the water consumption rate and increase the operation benefits.