Acoustical Noise Mitigation in Slip Angle Controlled DTC of Open-End Winding Induction Motor Drive Using AISPWM Based Triple Randomization Scheme for EV Application

Abstract

Industrial and/or Electric Vehicle (EV) drives require low vibration, acoustical noise, as well as efficient utilisation of the DC link. Induction motors with Direct Torque Control (DTC) meet the requirements of EVs and other modern industries. Flux and/or torque oscillations, on the other hand, produce high pitch acoustical noise during steady state, which has an impact on people's health and safety. Hence comprehending and reducing these oscillations are essential for quieter response of EVs. Therefore, EVs and/or workplaces noise reduction has gained significant importance. Space Vector Pulse Width Modulation (SVPWM) enhances the efficiency of DC link utilisation, as required by EVs. However, SVPWM is ineffective at noise reduction. Even if numerous Random PWM (RPWM) approaches minimize f noise, the issue of noise reduction persists due to the lower level of randomization. This study offers an acoustical noise reduction strategy for EV applications, namely Alternate Inverter Switching (AIS) based Hybrid Triple Randomised PWMs (HTRPWM) for DTC of an Open-End Winding Induction Motor Drive with Slip Angle Control. The Harmonic Spread Factor (HSF) is a measure of acoustical noise; the lower the HSF, the less acoustical noise. Thus, the proposed HTRPWMs strive to reduce the HSF and are compared to existing approaches.