Common mode voltage reduction with a modified hysteresis current control strategy

This paper presents a current control strategy to reduce the maximum common mode voltage levels of a three-phase inverter in adjustable speed drives application. Any reduction of the common mode voltage leads to a decrement of the high frequency related issues of AC drives such as leakage current, EMI noises, shaft voltage and motor bearing damages. Proposed strategy decreases the number of switching per cycle and also increases the current waveforms quality in comparison with traditional hysteresis controllers. Mathematical analyses have been verified through Simulations to investigate the presented method.