The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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Voltage Control Scheme in Synchronous Reference Frame for Improving Dynamic Characteristics in Parallel Operation of Double-Conversion UPSs

이중 변환 UPS 병렬 운전의 제어 동특성 향상을 위한 동기 좌표계 전압 제어기 구조

  • Mo, Jae-Sing (Dept. of Automotive Engineering (Automotive-Computer Convergence), Hanyang University) ;
  • Yoon, Young-Doo (Dept. of Automotive Engineering, Hanyang University) ;
  • Ryu, Hyo-Jun (Dept. of Automotive Engineering (Automotive-Computer Convergence), Hanyang University) ;
  • Lee, Min-Sung (Dept. of Automotive Engineering (Automotive-Computer Convergence), Hanyang University) ;
  • Choi, Seung-Cheul (Dept. of Automotive Engineering (Automotive-Computer Convergence), Hanyang University) ;
  • Kim, Sung-Min (Div. of Electrical Engineering, Hanyang University, ERICA Campus) ;
  • Kim, Seok-Min (LS ELECTRIC Co. Ltd) ;
  • Kang, Ho-Hyun (LS ELECTRIC Co. Ltd) ;
  • Kim, Hee-Jung (LS ELECTRIC Co. Ltd)
  • Received : 2021.12.14
  • Accepted : 2022.02.07
  • Published : 2022.08.20
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Abstract

This study proposes a voltage control scheme in a synchronous reference frame to improve the dynamic characteristics of double-conversion UPSs. UPSs need to control positive and negative sequence voltage, so that positive and negative sequence extractors are generally used to obtain each sequence of the voltage and current. Voltage and current controllers for each sequence are implemented. However, the extractor causes considerable delay, and the delay restricts the control performance, especially for the current controller. To improve the dynamics of the current controller, the proposed scheme adopts a unified current controller without separating positive and negative sequences. By using discrete-time current controller, the control bandwidth can be extended significantly so that negative sequence current can be controlled. To enhance the performance, an additional feed-forward technique for output voltage regulation is proposed. The validity of the proposed controller is verified by experiments.

Keywords

Acknowledgement

본 논문은 산업통상자원부 '산업전문인력역량강화사업'의 재원으로 한국산업기술진흥원(KIAT)의 지원을 받아 수행된 연구입니다. (2021년 친환경자동차(xEV) 부품개발 R&D 전문인력양성사업, 과제번호 : P0017120) 본 논문은 LS ELECTRIC의 연구비 지원을 받아 수행된 연구입니다.

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