DOI QR코드

DOI QR Code

Modular Scalable Inverter System에서 캐리어 비동기시 고주파 전압 보상을 이용한 순환전류 저감 기법

Circulating Current Reduction Method Using High Frequency Voltage Compensation in Asynchronous Carriers for Modular Scalable Inverter System

  • Choi, Seung-Yeon (Dept. of Electrical Engineering, HYPEC-EECS Lab., Hanyang University) ;
  • Kang, Shin-Won (Dept. of Electrical Engineering, HYPEC-EECS Lab., Hanyang University) ;
  • Im, Jun-Hyuk (Dept. of Electrical Engineering, HYPEC-EECS Lab., Hanyang University) ;
  • Kim, Rae-Young (Dept. of Electrical Bio-Engineering, Hanyang University)
  • 투고 : 2018.09.17
  • 심사 : 2018.11.17
  • 발행 : 2019.04.20

초록

This study proposes a circulating current reduction method that uses high-frequency voltage compensation when carrier phase difference occurs between two inverters in MSIS. In MSIS, inverters are configured in parallel to increase power capacity and to increase efficiency by using inverters only as needed. However, in the parallel inverter structure, circulating current is inevitably generated. Circulating current increases the stress on the switch, adversely affects the current control performance, and renders load sharing difficult. The proposed method compensates for the output voltage reference of the slave module by using the high-frequency voltage so that the switching pattern of each module is matched even in asynchronous carriers. The validity of the proposed method is verified by simulations and experiments with 600 W IPMSM.

키워드

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Fig. 1. Topology of MSIS.

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Fig. 2. A-phase circulating current loop.

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Fig. 3. Analysis of current in parallel inverters.

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Fig. 4. Switching frequency circulating current caused by carrier asynchronous.

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Fig. 5. Control block diagram.

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Fig. 6. Voltage compensation at carrier asynchronous.

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Fig. 7. Process of circulating current reduction.

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Fig. 8. Waveforms without voltage compensation.

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Fig. 9. Waveforms with voltage compensation.

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Fig. 10. Current waveforms with full load.

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Fig. 11. Voltage reference and circulating current waveforms with full load.

TABLE I PARAMETER OF MSIS

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참고문헌

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