摘要
大型光伏电站并网系统的无功优化配置是保障所接入电网安全稳定、提高系统运行经济性的重要关键技术。大型光伏电站的无功优化控制既要处理光伏电站自身和无功补偿装置的无功出力等连续控制变量,同时要考虑不同负荷情况下光伏电站不同出力变化情况下对接入配网系统电压的影响。分析光伏电站静态无功损耗和接入配网系统的电压水平,基于300 MW光伏电站计算其在不同出力情况下箱式变压器、集电线路、主变压器、外送线路的无功损耗情况,对该光伏电站进行静态无功优化计算,设计合理的无功装置接入位置,并根据无功补偿装置投切容量大小制定投切计划;然后分析光伏电站出力快速变化、站内无功补偿设备投切等动态变化对配网电压的影响,通过合理的动态分区设置,使配网系统能量损耗最小为目标进行动态无功优化。最后,基于300 MW光伏电站接入电网实际情况,利用DigSILENT搭建仿真计算模型进行算例分析,验证所述的无功优化配置方案的合理性和有效性。
Reactive power optimal configuration of large-scale photovoltaic power station grid-connected system is an key technology to ensure the security and stability of the grid connected to the station and to improve the operation economy of the system.The reactive power optimization control of large-scale PV power plant should deal with continuous control variables such as reactive power output of PV power plant itself and should reactive power compensation device.At the same time,it should considers the influence of different output in photovoltaic power station on the voltage of distribution system.This paper analyzes the static reactive power loss of photovoltaic power station and the voltage level of the distribution system,and calculates the reactive power loss of box transformer,collector transformer,main transformer and delivery line under different output conditions based on the 300 MW photovoltaic power station.The static reactive power optimization calculation of the PV power station is carried out.The rational reactive power device access position is designed,and the switching schedule is made according to the reactive power compensation capacity.Then it analyzes the influence of the fast change of output of photovoltaic power station and the dynamic change of reactive power compensation equipment on the distribution network voltage,dynamic reactive power optimization is carried out to minimize the energy loss of distribution system.Finally,based on the actual situation of 300 MW photovoltaic power plant connected to the power grid,the rationality and effectiveness of the reactive power optimization scheme are verified by using the simulation model of DIgSILENT.
作者
赵清松
王世成
张冠峰
程绪可
ZHAO Qingsong;WANG Shicheng;ZHANG Guanfeng;CHENG Xuke(School of Electrical Engineering,Shenyang University of Technology,Shenyang,Liaoning 110870,China;Liaoning Siji Technology Service Co., Ltd., Shenyang, Liaoning 110141, China;Electric Power Research Institute of State Grid Liaoning Electric Power Co.,Ltd.,Shenyang,Liaoning 110006,China)
出处
《东北电力技术》
2021年第10期5-10,共6页
Northeast Electric Power Technology
关键词
光伏电站
配网
无功优化配置
电压稳定
photovoltaic power station
power distribution network
reactive power optimal configuration
voltage stability
