Modified Phase Shifted SVPWM Technique for Five-Phase Open-End Winding Induction Motor with Zero Common Mode Voltage

Abstract

This paper explains the modulation technique for five-phase open-end winding induction motor (FPOEWIM) drives. FPOEWIM is connected to a single dc source with five phase dual inverter (FPDI). The issue of the common mode voltage (CMV) is important when FPDI shares common de link. The common mode current flows through the common dc link which is undesired due to its high-frequency content and causes adverse effects on bearing life of induction motor (IM). The proposed modulation scheme uses phase shifting between two inverters of FPDI, to eliminate the CMV. In this method, the direction of sequence is explored and utilized effectively to obtain reduced switching losses. It is shown in this paper that the total harmonic distortion (THD) in motor phase current is very less which gives nearly sinusoidal current. Additionally, the CMV is made equal for both the inverters at every instant to obtain zero resultant CMV in FPDI output. Thus, the common mode current flowing through the dc link is avoided. The other advantages provided by this method includes reduced number of switching, reduced torque ripple and improved harmonic response of motor phase current. The proposed method is verified by means of simulation results.