基于对称优化的SVPWM双闭环逆变器

Double closed-loop inverter with SVPWM based on symmetry optimization

为了使逆变器输出电压为谐波含量很小的正弦波,并获得较高的直流母线电压利用率,在控制策略上选择了电压空间矢量脉宽调制(SVPWM),并利用空间矢量对称性对计算过程进行了简单优化。为了获得稳定的输出电压波形,本文应用了电压电流双闭环控制的PWM三相逆变器,输出电压和输出电流分别通过电压外环和电流内环实现稳定控制。这种控制方法有效改善了系统的抗干扰能力和动态响应。MATLAB的仿真结果证明了该控制方法的正确性和高效性。

In order to get the output voltage wave of inverter with less harmonic and higher utilization of DC bus voltage, the voltage space vector pulse width modulation （SVPWM） is selected as a control strategy and the symmetry of space vector is used to optimize the process of calculation. In order to obtain a stable wave- form of output voltage, the voltage and current dual-loop three-phase inverter controlled by PWM is adopted, the outputs of voltage and current are controlled through the outer voltage loop and the inner current loop sta- bly. This control method is effective to improve the anti-interference ability and dynamic response of the sys- tem. The MATLAB simulation results verify the correctness and efficiency of the control method.