微特电机 ›› 2026, Vol. 54 ›› Issue (6): 43-50.

• 驱动控制 • 上一篇    下一篇

低载波比下 NPC 三电平 PMSM 双模过调制与复矢量解耦协同控制

苏锦鸿,孙  乐,卫俊佑,匡子恒,岳  毅   

  1. 南京理工大学 自动化学院,南京 210094
  • 出版日期:2026-06-26 发布日期:2026-06-28
  • 作者简介:苏锦鸿( 2005—) ,男,本科生,研究方向为电气工程及其自动化。

Mechanism of Overmodulation Region Partitioning and Dual-Mode Overmodulation Strategy for NPC Three-Level PMSM

SU Jinhong, SUN Le, WEI Junyou, KUANG Ziheng, YUE Yi   

  1. School of Automation,Nanjing University of Science & Technology,Nanjing 210094, China
  • Online:2026-06-26 Published:2026-06-28

摘要: 针对直流电压受限、弱磁高速及低载波比条件下,中性点钳位( neutral point clamped,NPC) 三电平逆变器驱动高极对数永磁同步电机过调制运行中电压利用率不足、电流畸变加剧及稳定性下降的问题,提出双模过调制、中点电荷平衡、复矢量解耦与延时补偿协同控制策略。 通过对过调制过程进行分区建模,实现线性区向深度过调制区的平滑过渡;同时抑制中点电压偏移,d、q 轴耦合及数字延时影响。 实验结果表明,所提方法可显著提高直流母线电压利用率,改善过调制区电流波形质量与系统稳定性。

关键词: NPC 三电平逆变器, 空间矢量脉宽调制, 双模过调制, 中点电压平衡, 复矢量解耦, 延时补偿

Abstract: To address insufficient direct current ( DC ) -bus utilization, aggravated current distortion, and stability degradation in high-pole-pair permanent magnet synchronous motor ( PMSM) drives fed by neutral point clamped ( NPC) three-level inverters under DC-voltage-limited, flux-weakening, and low-carrier-ratio overmodulation conditions, a coordinated control strategy integrating dual-mode overmodulation, charge-based neutral-point balancing, complex-vector decoupling,and delay compensation is proposed. By partitioning the overmodulation process, smooth transition from the
linear region to deep overmodulation is achieved,while neutral-point voltage deviation,d,q-axis coupling,and digital-delay effects are simultaneously suppressed. Experimental results verify that the proposed method improves DC-bus utilization and enhances current waveform quality and system stability in overmodulation operation.

Key words: neutral point clamped three-level inverter, space vector pulse width modulation, dual-mode overmodulation, neutral-point voltage balancing, complex-vector decoupling, delay compensation

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