一种应用于单相逆变器控制的改进虚拟电抗实现方法

An Improved Implementation of Virtual Reactance for Control of Single-phase Inverter

在单相静止坐标系下,单相逆变器实现虚拟电抗的传统方法是对输出电流或者电感电流进行微分运算,容易放大干扰,对采样精度要求很高,同时实现虚拟电抗的精度较低。为此,提出一种延迟电流反馈法实现虚拟电抗,无需微分运算,且实现虚拟电抗的精度高。理论分析了2种方法的特点,并通过仿真和实验验证了理论分析的正确性和所提方法的有效性。

In single phase stationary frame, the traditional method to implement virtual reactance is based on the differential of the output current or inductor current, which has high sensitivity to noises and requires high precision of sampling. Meanwhile, the accuracy of the virtual reactance is low. In this paper the current delay method is proposed to realize virtual reactance avoiding the differential operation, and the high precision can be guaranteed. The characteristics of the two methods are analyzed theoretically. Simulation and experimental results demonstrate the validity of the proposed method.