Discrete-time sliding mode direct power control for three-phase rectifiers

In this paper a new discrete-time sliding mode control scheme for three-phase PWM rectifiers is proposed. Active and reactive powers are directly controlled using a virtual-flux oriented reference frame. Robustness of the proposed methodology to filter inductance variation is shown. Simulation results of a rectifier connected to a large power system are presented to compare the performances of the proposed strategy and the voltage oriented control scheme. Experimental results also show the better performance of the proposed scheme.