基于可变下垂系数的光伏电站无功电压控制策略  

Reactive voltage control strategy of photovoltaic power station based on variable droop coefficient

作　　者：朱慧敏 苑舜[1] 李春来 Zhu Huimin;Yuan Shun;Li Chunlai(School of Electrical Engineering,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳工业大学电气工程学院,辽宁沈阳110870

出　　处：《可再生能源》2020年第8期1103-1108,共6页Renewable Energy Resources

基　　金：国家电网公司科技项目资助(2017-0-32-2-10)。

摘　　要：文章提出了一种基于可变下垂系数的光伏电站无功电压控制策略,通过对光伏电站不同光伏单元当前有功功率的评估,计算每个光伏逆变器的可利用无功容量。而无功下垂系数则根据各光伏单元当前可利用的无功容量大小进行自适应调整,在不牺牲有功的情况下最大限度地利用光伏电站的无功支撑能力。最后,通过PSCAD/EMTDC仿真软件,验证了所提控制策略的有效性。The use of the reactive power voltage regulation capability of photovoltaic power plants is an effective method to solve the problem of voltage at the grid-connected point of photovoltaic power plants.Traditional photovoltaic power plant reactive voltage control usually uses a fixed droop control coefficient,and it is difficult to effectively utilize the reactive power support capabilities of photovoltaic power plants.In view of this,this paper proposes a photovoltaic power plant reactive voltage control strategy based on variable droop coefficients.The strategy calculates the available reactive capacity of each photovoltaic inverter by evaluating the current active power of different photovoltaic units in the photovoltaic power station,and the reactive droop coefficient is adjusted adaptively according to the current available reactive capacity of each photovoltaic unit,so as to maximize the use of the reactive support capacity of the photovoltaic power station without sacrificing the active power.Finally,PSCAD/EMTDC is used to verify the effectiveness of the proposed control strategy.

关 键 词：光伏电站 无功电压控制 可变下垂系数 无功容量 

分 类 号：TK51[动力工程及工程热物理—热能工程] TM615[电气工程—电力系统及自动化]