A Three-Level Interleaved VSI with Active Fourth Leg for CMV Mitigation in Aerospace Applications

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This paper presents a three-level parallel and PWM interleaved voltage source inverter with an active fourth leg (3LFVSI) for aerospace applications. The proposed topology effectively mitigates common-mode voltage (CMV), thereby reducing electromagnetic interference (EMI) while ensuring high system efficiency. The study presents a comprehensive analysis of the operational principles, modulation strategies, and circuit configurations of the 3LFVSI. Simulation results demonstrate its effectiveness in reducing high-frequency noise and commonmode current while significantly improving harmonic distortion. Additionally, the analysis highlights the fourth leg's role in synchronizing the CMV, enabling effective cancellation and enhancing overall system performance. The results confirm that the proposed topology reduces EMI noise while maintaining high efficiency in high-speed motor drive systems for more electric aircraft.