Robust interference suppression of three phase structural uncertainty inverter system based on equivalent input interference method

In the actual filter system of three-phase inverter, there are uncertainties of inductance, resistance and capacitance. The traditional equivalent input disturbance (EID) compensation method can compensate and suppress any external disturbance. The improved EID controller designed based on Lyapunov functional method can achieve robust control of structural uncertainty systems. But the tracking performance based on this method is poor and cannot be used in the actual system of sinusoidal signal tracking. In this paper, a three-phase inverter with uncertain structure is used to inject constant amplitude and frequency current into the power grid or load. Park transform is used to transform tracking current signal and EID controller into rotating DQ coordinate system. Combined with Lyapunov functional method, the EID coupling parameters are designed to make the component uncertainty inverter standby robust.