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<p>This paper proposes an active discrete-control-set modulated model predictive control (ADCS-M2PC) strategy for three-level neutral-point-clamped (NPC) inverters. The proposed method aims to address the degradation in the number of voltage levels and neutral-point potential (NPP) deviation present in conventional M2PC methods. First, a new discrete-control-set (DCS) is constructed to improve the output current quality. In the DCS, the virtual large vectors, synthesized from basic vectors that incorporate the <i>O</i>-state, can prevent the degradation of voltage levels under high modulation indices. Furthermore, the NPP deviation is effectively suppressed by dynamically adjusting the dwell times of redundant small vectors. Simulation and experimental results verify the effectiveness of the proposed strategy. Compared with the conventional FCS-MPC, the proposed method reduces the output current total harmonic distortion (THD) by approximately 46% and suppresses the NPP fluctuation amplitude to within 0.3&#xa0;V.</p>

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Discrete-control-set M2PC strategy for three-level NPC inverters with active neutral-point potential control ability and low current THD

  • 期刊论文

  • 发表日期：

    2026年4月30日

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  • Hongjun Shao,
  • Futian Huang,
  • Ying Wang,
  • Hongjun Duan,
  • Tao Liu,
  • Weijie Hou

摘要

This paper proposes an active discrete-control-set modulated model predictive control (ADCS-M2PC) strategy for three-level neutral-point-clamped (NPC) inverters. The proposed method aims to address the degradation in the number of voltage levels and neutral-point potential (NPP) deviation present in conventional M2PC methods. First, a new discrete-control-set (DCS) is constructed to improve the output current quality. In the DCS, the virtual large vectors, synthesized from basic vectors that incorporate the O-state, can prevent the degradation of voltage levels under high modulation indices. Furthermore, the NPP deviation is effectively suppressed by dynamically adjusting the dwell times of redundant small vectors. Simulation and experimental results verify the effectiveness of the proposed strategy. Compared with the conventional FCS-MPC, the proposed method reduces the output current total harmonic distortion (THD) by approximately 46% and suppresses the NPP fluctuation amplitude to within 0.3 V.