三相光伏并网发电系统的建模与仿真

本文系统地介绍了三相光伏并网发电系统的建模与仿真。根据光伏阵列的等效电路,在Matlab/simulink中采用S函数的方式,建立了光伏阵列的数学模型。基于光伏阵列的V-I曲线,利用牛顿迭代求解方法,确定了光伏阵列并网运行的最大功率点。根据三相光伏并网发电系统的结构图,结合双闭环并网的控制策略,实现了光伏阵列的最大功率点跟踪控制、光伏并网电流的正弦化和单位功率因数。最后,将光伏并网接入到电力系统的配电网络中,结合算例,研究了日照强度、环境温度、控制策略等变化时,光伏阵列的仿真结果。通过仿真分析,证明了本文所建立的三相光伏并网的模型和控制策略的正确性。

Modeling and Simulation of the Three Phase Photovoltaic Grid-connected Generation System

The modeling and simulation of the three phase photovoltaic grid-connected electric system are presented in this paper.According to the equivalent circuit of solar cell,it builds the mathe-matic model of photovoltaic array by S function in Matlab/simulink.Based on the V-I characteristic curve,it calculates the Maximum Power Point of photovoltaic array grid-connected running by using Newton’s method.By the structure of the three phase photovoltaic grid-connected system and the double-loop feedback control,it carries out the Maximum Power Point Tracking(MPPT) and the sine grid-connect current and the unity power factor.At last,the three phase photovoltaic grid-connected generation system is connected to the distribution of power system.It analyzes the simulation result under the changing sunlight,the changing temperature and the changing control strategy.It is verified that the proposed models of the three grid-connected phase photovoltaic system and the control strategy are correct.