三相单级式光伏发电系统并网控制与仿真

Research on the Grid-Connected Control and Simulation of Three-phase Single-Stage Photovoltaic( PV) Power System

基于三相单级式光伏并网发电系统的电路拓扑结构,提出了一种快速逼近插值算法实现光伏发电的最大功率跟踪,光伏并网采用电压外环和电流内环双闭环控制,通过同步旋转坐标变换结合逆变器的控制,利用比例积分控制实现无功功率与有功功率的独立解耦控制。MATLAB系统仿真结果表明,该方法能够快速稳定地实现单位功率因数最大功率并网,降低并网系统成本,提高光伏并网的电能质量。

A fast approximation interpolation algorithm to achieve maximum power tracking （ maximum power point track-ing, MPPT） function has been proposed in this paper based on the circuit topology of three -phase photovoltaic （PV） grid power generation system , which takes double closed-loop grid-connection control strategy .Through synchronously rota-ting conversion of coordinates combing with the control of the inverter , the independent decoupling control of reactive power and active power will be realized by proportional integral .The simulation results based on MATLAB show that this method can achieve flexible grid connection with unit power factor easily , reduce the cost and is easy to realize .