Journal of Power Electronics

  • 제24권10호
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  • Pages.1628-1638
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  • 2024
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  • 1598-2092(pISSN)
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  • 2093-4718(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
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Phase current control to reduce unbalanced outputs in paralleled inverters

  • Bong-Ki Lee (Department of Electrical and Computer Engineering, Ajou University) ;
  • Heon-Su Lee (LS ELECTRIC R&D Campus) ;
  • Kyo-Beum Lee (Department of Electrical and Computer Engineering, Ajou University)
  • 투고 : 2024.01.26
  • 심사 : 2024.07.21
  • 발행 : 2024.10.20
⟨ 이전 논문 다음 논문 ⟩

초록

When paralleled inverters operate an electric motor, a circulating current is typically generated due to a device-switching timing error. To mitigate this error, an AC reactor is installed at the output of the inverters to reduce the circulating current. However, unbalanced output currents (UOCs) are produced due to the difference between the resistance and inductance in the AC reactor. When there is a difference in the output currents of the inverters, a single inverter outputs excessive current. As a result, the motor cannot be controlled to its maximum power. In this study, mathematical modeling is performed and the causes for the generation of UOCs in parallel connected electric motor drive systems are analyzed. Furthermore, the unbalanced load is minimized by controlling the current output based on the output status of the inverters in the control algorithms of a motor. The proposed control method is experimentally verified by implementing a system that connects three inverters in parallel.

키워드

과제정보

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT), the Korea Institute of Energy Technology Evaluation and Planning (KETEP), and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. RS-2024-00333208, No. 20225500000110).

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