SVPWM based common mode voltage mitigation using Boost Converter fed open-end winding AC drive

Power electronic AC motor drive systems contain PWM inverters as one of the major parts. These PWM inverters when operated at high frequencies results in leakage current flowing through the parasitic capacitors to the ground which generates a voltage appearing between the neutral point of load and ground known as common-mode voltage (CMV). This voltage can affect the performance of the machine as it causes shaft voltage, bearing current and EMI issues. CMV elimination using conventional Three-level NPC multilevel topology has certain drawbacks. An improved SVPWM strategy using open-end winding configuration is introduced which eliminates alternating CMV and also makes CMV across machine windings zero such that no circulating common-mode current flows through it. An additional boost in dc-link voltage is provided using a Boost Converter considering the limitation of reduced dc bus utilization. A comparative simulation study is done between conventional and proposed configuration and verified using MATLAB.