Vector control of matrix converter-fed synchronous reluctance motor based on flux observer

Abstract

In this paper, a synchronous reluctance motor fed by a matrix converter (MC) is current and flux controlled. Despite the advantages of matrix converters compared to conventional back-to-back converters, the application of these converters for synchronous reluctance motors (SyRMs) is not reported in the literature. The flux linkage on d axis and the current on q axis are closed loop controlled for the sake of a good combination of dynamic response and efficiency. Real-time maximum torque per Ampere usefully minimizes losses at all speeds, in particular at partial load. The input and output vectors of the converter are modulated using indirect space vector modulation technique. A flux observer provides the feedback to the d regulator. The nonlinearities of the converter are identified and compensated, to the benefit of voltage estimation and then flux estimation accuracy. Simulation results show that the presented MC-SyRM drive is promising for compactness and efficiency in critical applications.