Performance of indirect matrix converter with improved control feeding doubly fed induction machine

Abstract

An Indirect Matrix Converter (IMC) with modified control technique feeding the rotor of Doubly fed induction machine (DFIM) with stator connected to three phase supply is discussed in this paper. This Indirect Matrix Converter with proposed control is divided into Rectifier stage and inverter stage. The output of the Rectifier stage with the proposed improved switching produces maximum dc voltage when compared to that of conventional IMC at the DC bus and ensures that the fundamental input current is kept at unity power factor under all operating conditions. The inverter stage uses a new switching scheme through improved switching sequence of space vectors where by the switching losses and output voltage distortions are reduced. The rotor side speed control of induction motor with proposed IMC supplying variable voltage at slip frequency to the rotor is analysed. The operation of the machine as Induction generator(DFIG) is investigated under sub and super synchronous speeds of the rotor driven by an external prime mover. The main objective of this paper is to study the performance of IMC with improved control supplying power to the rotor of Doubly fed induction generator (DFIG) under all operating conditions. All the above mentioned switching techniques applied to IMC supplying power to induction motor load are analysed in MATLAB/ SIMULINK.