Novel Fault Analysis and Compensation in 5-Level Multilevel DC-AC Converter

Abstract

Existing Neutral clamped active (NCA) inverter has the property of common mode voltage with high frequency which can reduce the severity with less voltage gain. A newly designed 5L NCA inverter can capable have achieved voltage step-up with a one stage inversion process. Proposed circuit common ground increases voltage utilization in DC link and also mitigates common mode voltage with high frequency. Proposed topology has advantage of more compact and less voltage stress over existing two stage topology. Proposed circuit has only seven power switches with two capacitors, whereas existing topology is designed with 10 switches with 3 capacitors, so arrangement can obtain more efficiency. Implementation of this proposed topology is initially design in simulink platform, and the simulation results are finally verified in a proto-type model with power rating of 2000 W to validate its feasibility and performances with its fault clearance ability.

Keywords

• Neutral clamped active (NCA) inverter
• 5-Level
• common mode voltage
• high frequency mitigation
• Total Harmonic Distortion

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