Common Mode Voltage Reduction in Diode Clamped Multilevel Inverter

Project Abstract / Summary : In this project the aim is to reduce the “Common Mode Voltage” using Diode-clamped Multilevel Inverter by modulation technique. CMV is defining as the voltage at the star point of the load and the system ground, it leads to common mode current. Effect of Common Mode Voltage is that leakage current flows in induction motor which causes shaft voltage & premature failure of the bearings. The simultaneous switching of the series connected devices generates voltage with a high dv/dt at the output terminal of the inverter. The sudden rise in the inverter output voltage and a long cable are potentially hazardous for the motor insulation and the cable itself. Hence it is very important to reduce the Common mode voltage.

Why did you choose to work on this project topic : Because the Normal Two level Inverter(Conventional Inverter 3PHASE Inverter) has many drawbacks like High Distortion,Voltage failure, High THD and Losses when such Inverter are Connected to Induction motor Drive to control the speed of motor causes the leakage current and voltage. If such current goes beyond the limit because of transient the insulation breakdown occur and Bearing and Shaft get easily damage which causes failure of Motor.
As I am an ELECTRICAL ENGINEER I think this is most series fault of normal Inverter, and o other side Multi-level Inverter has very large era in Power Industry.

Project Category : Electrical / Electronics / Communication
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Institute/College Name: Dr. Babasaheb Ambedkar College of Engg. & Research
City: Nagpur
State: Maharashtra
Participating Team From: Final Year