Switching frequency variation control of hysteresis current controlled indirect matrix converter fed pmsm drive

Abstract

AC motor drives fed from current controlled power electronic converters are popular on newlineaccount of their superior steady-state and transient performance. Conventionally used newlineconverters for motor drive applications employ two-stage power conversion - initially newlinefrom AC to DC (rectiand#57344;er) and then from DC to AC (inverter). DC bus capacitors newlinedecouple the power and#57345;ow between the rectiand#57344;cation stage and the inversion stage of newlineconventional power converters. The DC bus capacitors consume a major share of weight newlineand volume of the converter. Direct AC-AC power conversion is possible by using newlinea different class of power electronic converters named as matrix converters. Indirect newlineMatrix Converter (IMC) is a topological variant of the matrix converter that looks newlineexactly similar to that of a conventional converter, except for the DC bus capacitors. newlineThus, the direct AC-AC conversion is separated into rectiand#57344;cation and inversion stages newlinewithout any power and#57345;ow decoupling in IMC. newlineConsidering conventional converters, PI based current controllers and hysteresis newlinecurrent controllers are the commonly used controllers for the inverter stage that maintains newlinethe motor current at the desired magnitude and phase angle. The advantages of newlinethe hysteresis current controllers are simple implementation, independent of the system newlineparameters, and excellent dynamic performance. The variation in switching frequency newlineof the converter and the random selection of the switching vector of the converter are the newlinetwo disadvantages of hysteresis current controllers. Appraisal of current error as a space newlinephasor to modify the hysteresis controller and thereby to achieve constant switching newlinefrequency operation with optimal switching vector selection is reported for Voltage newlineSource Inverter (VSI) fed induction motor drives. The modiand#57344;ed hysteresis controller is newlinenamed as the Current Error Space Phasor (CESP) based hysteresis controller.