Nine-to-Three Phase Direct Matrix Converter with Model Predictive Control for Wind Generation System

Abstract

The power conversion from variable AC voltage into a desired AC voltage with fixed magnitude and fixed frequency is attracting more attention especially in case of grid-connected wind generation system. Indeed, the Direct Matrix Converter (DMC) can be used as a suitable solution for such AC/AC conversion to fulfill the requirement of the output voltage with desired magnitude and frequency. Nine to three phase matrix converter developed in this paper is proposed to ensure the conversion of nine-phase input voltage into three- phase voltage, the output current magnitude and frequency control and the input current power factor control. Among the existing control techniques, The Model Predictive Control (MPC) is considered to be one of the most effective control techniques. In this paper MPC is used to control the twenty-seven switches used in the topology of the nine-to-three phase matrix converters, where the main aim is to achieve principal control functions such as, the output current magnitude and frequency control and input current control to ensure a reduced shift phase, hence a nearly unity power factor in the input side of the DMC.