三电平PWM整流器双闭环控制系统研究

本文对三电平PWM整流器的拓扑结构进行了分析,结合三电平PWM整流器的数学模型,提出了一种固定开关频率的控制方法。采用功率、电流的双闭环策略通过SVPWM对系统进行控制。该方法使用MATLAB/SIMULINK软件仿真,结果表明,该控制方法能保证中点电位平衡、网侧电流谐波小,具有良好的动、静态性能,实现了单位功率因数运行,通过样机实验,验证了所提方法的正确性和可行性。

Research on Dual Closed-Loop Control of Three-Level PWM Rectifier System

In this paper, base on analyzing the three-level PWM rectifier topology combined with the three-level PWM rectifier mathematical model, a fixed switching frequency dual close-loop control method was proposed. Take the power as out loop and the current inner loop as control strategy to control the system with SVPWM. The Simulation results by soft- ware MATLAB/SIMULINK shoWs that the control method can guarantee the midpoint poten- tial balance, the current harmonics of net side is smaller, it has a good static and dynamic performance, can operate under unity power factor. The correctness and feasibility of the proposed method is verified by the experiment.