混合型逆变器控制系统中零序电流的研究∗

摘要

Introduc the hybrid inverters control system for solving the problems of traditional power inverter. The inverter parallel form to reduce the harmonic current which flows into the motor was used, but the zero sequence current in the hybrid inverters would increase inverter loss. For the zero-sequence current exist in system, the mathematical model of zero sequence current was derived, and the causes of zero sequence current was analyzed. Finally, a control method based on the t feedback control of zero axis curren was taken. The method had simple algorithm without changing the circuit topology and was suitable for sinusoidal pulse width modulation. MATLAB/Simulink software to build a model of hybrid inverters control system was taken, and its zero sequence current control carries out simulation. The results show that the method of zero sequence current significantly inhibited.%针对传统大功率逆变器所存在的问题，对混合型逆变器控制系统进行了介绍。系统采用了逆变器并联的形式以减少流入电机的谐波电流，但是在混合型逆变器控制系统中存在的零序电流会增加逆变器损耗。针对系统中存在的零序电流，推导了零序电流的数学模型，并分析了零序电流的产生原因，最终采用一种基于零轴电流反馈控制的控制方法。该方法算法简单，不需要改变电路的拓扑结构，适用于传统的正弦脉宽调制控制策略。利用MATLAB/Simulink软件搭建了混合型逆变器控制系统模型，并对其零序电流的控制进行了仿真验证。结果表明该方法对零序电流有明显抑制作用。