基于电流滞环跟踪PWM逆变器双闭环控制研究

Research on Double Closed Loop Control of PWM Inverter Based on Current Hysteresis Loop Tracking

为提高并网逆变器的控制性能,以三相全桥并网逆变器为研究对象,采用LCL滤波器作为输出滤波器,通过Matlab/Simulink建立三相并网系统逆变器模型,采用电流滞环跟踪控制,并将电流单环控制和电压电流双闭环控制进行了比较。仿真结果表明,在电流滞环控制策略下,电压电流双闭环控制不仅跟踪速度快、稳定性高,并具有保持并网电流与电网电压同相位、波形畸变较小、动态响应快的优点。

In order to improve the control performance of the grid connected inverter, taking the three-phase full bridge inverter as the research object, the LCL filter is used as the output of the filter, the three-phase grid connected inverter system model has been established through Matlab/Simulink, based on current hysteresis loop tracking control, and compared the current single loop control with voltage and current double closed-loop control . Simulation results show that with the hysteresis current control strategy, voltage and current double closed-loop control not only has a high tracking speed and stability, but the grid connected current and grid voltage also maintain in the same phase and has the following advantages ： waveform distortion is small, fast transient response.