基于双环控制的三相SVPWM逆变器研究

Study of the Three-phase SVPWM Inverter based on Double Loop Control

提出一种基于电压电流双环控制的三相SVPWM逆变器,分析了其两相同步旋转坐标系下的数学模型并由此构建了系统的电压电流控制器。为了提高系统的动态响应特性及抗扰能力,电压外环包含了负载电流前馈及输出滤波电容电流解耦,电流内环包含了输出电压前馈及输出滤波电感电压解耦。20kVA实验样机的实验结果表明,该逆变器具有良好的非线性负载能力。

A threephase SVPWM inverter based on voltagecurrent doubleloop control is proposed.The voltage and current controller are set up through analyzing the mathematical model under two phase synchronous rotating frame.In order to improve the dynamic response character and interference rejection ability,voltage outer loop includes the feedforward of load current and output filtering capacitance current decouple component.Current inner loop includes the feedforward of output voltage and output filtering inductance voltage decouple component.The experimental results from a 20 kVA prototype verified that the inverter has good performance with nonlinear load.