PWM型光伏并网逆变器的双闭环控制系统设计及仿真研究  

Design and Simulation Research on the Double Closed Loop Control System of PWM Photovoltaic Grid Connected Inverter

作　　者：刘建[1] 冉玘泉 

机构地区：[1]西南交通大学电气工程学院,四川成都610031

出　　处：《电气开关》2015年第5期63-66,69,共5页Electric Switchgear

摘　　要：设计了单相光伏并网系统中PWM型并网逆变器的双闭环控制系统,内环采用固定开关频率直接电流控制,并用典型Ⅰ型系统进行设计。同时,为了使电压型逆变器稳定运行,必须对直流电压进行闭环控制来稳定直流电压。用Matlab/Simulink中的Power Systems Block建立PWM逆变器双闭环控制系统仿真模型,仿真结果表明,电流有较好的跟随性,直流侧电压有较好的稳定性,该控制系统其能够实现单位功率因素并网,减少谐波分量,提高电能质量。In this paper, we have designed the double closed loop control system which belongs to PWM grid connected inverter in single-phase photo- voltaic grid system. The inner loop adopts fixed switching frequency current controlling and the design with the type I system. At the same time,in order to keep voltage fed inverter operate stablely, must adapt closed loop control to maintain a stable DC voltage to maintain a stable DC voltage. Establish the simulation model of the double closed loop control system of the PWM inverter in Matlab/simulink/Power Systems Block. The simulation results show that the phase of the Current can follow the phase of thevohage. And DC voltage has a preferable stability The con- trol system can achieve the goal of connecting the grid at the unity power factor, reducing the harmonic component, im- proving the quality of electric energy.

关 键 词：光伏并网系统 PWM型逆变器 双闭环控制 

分 类 号：TM921[电气工程—电力电子与电力传动]