Study of Quasi-Z-Source Three-Phase Four-Switch Matrix Converter Under Unbalanced Input

Aiming at the control problem of a new topology of Quasi-Z source three-phase four-leg direct matrix converter (TFDMC), a new method is proposed to solve the problem under unbalanced input conditions. Based on the idea of direct current control on the grid side, the combined current predictive control of the grid side current and the output of the matrix converter is carried out, which simplifies the complicated algorithm of the traditional filter. Based on the principle of minimizing reactive power and controlling the fluctuation of active power, the phase sequence of the current on the grid side is separated, so as to carry out the model predictive control. This method not only improves the output current quality of the matrix converter, but also improves the current quality of the grid side. simulink simulation verifies its effectiveness.