A New Direct Power Control of Doubly-Fed Induction Generator using Matrix Converter

Abstract

This paper proposes a new direct power control strategy of doubly-fed induction generator using matrix converters (MCs). This method, poses many advantages such as lack of bulky DC-link capacitor in conventional voltage source inverters (VSIs) and also eliminating grid side converter controller, which its main objective is to keep DC-link voltage constant. On the other hand, due to higher number of output voltage vectors in MCs in comparison with VSIs, there are degrees of freedom which will be used to control input power factor of MC (the power factor in the interface with the grid side) and keep it close to unit (cosq = 1). The active and reactive power equations are expanded and effects of voltage vectors on active and reactive power variations are investigated quantitatively. Then a new switching table is proposed. Simulation results show the effectiveness of proposed strategy.