市电平衡式光伏发电系统双PWM变流器的研究

摘要

In view of the problem of two-way flow of energy between balanced photovoltaic power generation system in city electricity and the grid,the control of dual PWM converter is studied.The mathematical model based on d-q axis is set up according to the circuit topology of threephase dual PWM converter,and the double closed loop control strategy of system and dual PWM converter coordinated control strategy are designed combining with the space vector modulation,three-phase digital phase-locked loop.The parameters of DC side capacitor and AC side filer inductor are designed according to the actual demand of system power balance.Simulation and experimental results verify the effectiveness of the system control strategy and the feasibility of the dual PWM converter to achieve the power balance in balanced photovoltaic power generation system in city electricity.%针对市电平衡式光伏发电系统与电网之间存在能量双向流动问题,研究双PWM变流器控制.根据三相双PWM变流器的电路拓扑结构搭建了基于dq坐标的数学模型,并结合空间矢量调制、三相锁相环设计了系统的双闭环控制策略及双PWM变流器的协调控制策略.根据系统功率平衡的实际需求,设计了直流侧电容、交流侧滤波电感的参数.仿真和实验样机验证了系统控制策略的有效性及双PWM变流器实现市电平衡式光伏发电系统中功率平衡的可行性.