Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Differential mode voltage reduction in dual inverters used to drive open-end winding interior permanent magnet synchronous motors

  • Hyung‑Woo Lee (Department of Electrical and Computer Engineering, Ajou University) ;
  • Deog‑Ho Lee (R&D Division, S&D Powernics) ;
  • Kyo‑Beum Lee (Department of Electrical and Computer Engineering, Ajou University)
  • Received : 2023.02.06
  • Accepted : 2023.07.24
  • Published : 2023.10.20
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Abstract

In this paper, a level-shift-based voltage modulation method for dual inverters used to drive open-end winding interior permanent magnet synchronous motors is presented. Notably, the conventional level-shift-based voltage modulation method used for dual inverters presents a disadvantage, since the differential mode voltage (DMV) significantly increases compared with that in the basic control method of dual inverters. This defect can be attributed to the fact that the conventional level-shift-based voltage modulation method uses a voltage vector combination that generates the maximum DMV peak value. To address this problem, the proposed method reduces the DMV by explicitly switching the voltage vectors that generate a large DMV. In this paper, the DMV generation process in a dual-inverter system is analyzed. Moreover, the DMV tendencies of the conventional and proposed methods are divided into operating regions according to the modulation index, which are further analyzed. The effectiveness and performance of the proposed voltage modulation method for a dual inverter are verified based on simulation and experimental results.

Keywords

Acknowledgement

This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20206910100160 and No. 20225500000110).

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