Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Dual‑mode overmodulation strategy based on linear velocity amplification

  • Yuanhao Luo (School of Automotive Studies, Tongji University) ;
  • Yuan Zhu (School of Automotive Studies, Tongji University) ;
  • Ling Meng (School of Automotive Studies, Tongji University) ;
  • Shihua Xu (Jiangling Motor Corporation Group Co., Ltd.) ;
  • Kewen Yang (Jiangling Motor Corporation Group Co., Ltd.) ;
  • Wanqiang Feng (Nanchang Automotive Institute of Intelligence and New Energy, Tongji University (NAIT))
  • Received : 2024.07.02
  • Accepted : 2025.01.02
  • Published : 2025.08.20
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Abstract

In automotive applications, overmodulation strategies are of great importance to fully utilize limited dc-bus voltage. Among the various dual-mode overmodulation strategies, Holtz's strategy exhibits the best performance. However, it places a heavy computational burden on the processor due to its voltage modification mechanism in overmodulation Mode II. To solve this problem, this article proposes a voltage modification mechanism based on linear velocity amplification. Rather than utilizing angle values, the voltage vectors are modified through calculations with the switching times of basic voltage vectors. This results in a straightforward digital implementation with significantly less computational efforts. Based on this mechanism, a dual-mode overmodulation strategy is proposed, which incorporates the minimal distance error method to achieve a more uniform voltage distribution along the voltage hexagon. A theoretical analysis demonstrates its capability for smooth transitions to six-step operation, unit voltage gain, as well as the simple implementation. Furthermore, this strategy has the lowest total harmonic distortion among the main dual-mode strategies throughout the overmodulation range. Finally, the effectiveness and validity of the proposed strategy are verified on an interior permanent magnet synchronous motor platform.

Keywords

Acknowledgement

This work is funded and supported by the Key Research and Development Program of Jiangxi province of China under Grant 20224BBE52003.

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