CONTROL OF SRM USING 3-LEVEL NEUTRAL POINT DIODE CLAMPED CONVERTER WITH PI AND FUZZY CONTROLLER

Abstract: In this paper 3-level neutral point diode clamped converter is used to control the SRM instead of generally used asymmetric half bridge converter. The modulation method and current control method of the diode clamped converter are also presented. By comparing both the converters it will prove that 3-level neutral point diode clamped converter has higher efficiency and lower current ripple than the half bridge converter with the same switching frequency. Both conventional PI and Fuzzy logic controllers are used as speed controllers and their results are compared which shows that Fuzzy Logic controller is best than conventional PI controller in obtaining steady state speed. Both the controllers are compared at constant speed and also at the variation of speed and their simulation/MATLAB results are shown.

Keywords: Switched Reluctance Motor, clamped converter, NPC converter, fuzzy logic controller.