ORIGINAL RESEARCH article
Front. Energy Res.
Sec. Smart Grids
Volume 13 - 2025 | doi: 10.3389/fenrg.2025.1688128
A Neutral-Point Voltage Balance Control Method for 3L-NPC Converters
Provisionally accepted
- Hunan International Economics University, Changsha, China
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The inherent problem of neutral-point potential unbalance in three-level neutral-point-clamped (3L-NPC) converters increase the risk of overvoltage in switching devices, cause increased output harmonic content, and seriously affects the performance and safe operation of the converters. To achieve neutral-point voltage balance control, this paper proposes a neutral-point voltage balance control method based on zero-sequence component injection. The proposed method has the advantage of low computational complexity and can achieve balance control of neutral-point potential under various operation conditions. Finally, the experimental results validated the correctness and effectiveness of the presented method.
Keywords: three-level neutral-point-clamped (3L-NPC) converter, zero-sequence componentinjection, neutral-point voltage balance, NPV Balance Control Method, the Compensated Zero-Sequence Voltage
Received: 18 Aug 2025; Accepted: 20 Oct 2025.
Copyright: © 2025 Wang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Jun Wang, liaozh@leaguerme.com
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