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Novel Modulation Strategy to Achieve Neutral-point Voltage Balance, Common-mode Voltage, and Switching Loss Reduction for Neutral-point Clamped Three-level Inverters
Chinese Journal of Electrical Engineering 2024, 10(4): 106-118
Published: 31 December 2024
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Carrier-based pulse width modulation (CBPWM) and virtual space vector pulse width modulation (VSVPWM) are briefly reviewed for neutral-point-clamped three-level inverters (NPC TLI). A new modulation strategy referred to as N3S_CBPWM is then proposed to simultaneously consider multiple goals, such as the-neutral-point voltage (NPV) balance, switching loss, and common-mode voltage (CMV) reduction. For N3S_CBPWM in each switching cycle, the three-phase switching actions are zero, one, and two. In addition, the constraint conditions of the modulation waves are provided based on the reduction of the CMV. Subsequently, N3S_CBPWM, CBPWM, and VSVPWM are compared in terms of the NPV balance capability, switching loss, and CMV reduction. Finally, the feasibility and superiority of the proposed N3S_CBPWM are verified experimentally.

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