Journal of Power Electronics

  • 제20권3호
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  • Pages.731-742
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  • 2020
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  • 1598-2092(pISSN)
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  • 2093-4718(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
권호 표지
DOI QR코드

DOI QR Code

Fault-tolerant control strategy for open-circuit fault of two-parallel-connected three-phase AC-DC two-level PWM converter

  • Ku, Hyun-Keun (Power Grid Group, Next Generation Transmission & Laboratory, Research Institute, Korea Electric Power Corporation) ;
  • Jung, Jun-Hyung (Southeast Korea GRAND ICT Research Center, Pusan National University) ;
  • Park, Jin-Woo (Appliance R&D Lab, LG Electronics) ;
  • Kim, Jang-Mok (Department of Electrical and Computer Engineering, Pusan National University) ;
  • Son, Yung-Dueg (Department of Mechanical Facility Control Engineering, Korea University of Technology and Education)
  • 투고 : 2019.09.03
  • 심사 : 2019.12.12
  • 발행 : 2020.05.20
⟨ 이전 논문 다음 논문 ⟩

초록

This paper proposes a fault-tolerant control (FTC) strategy for an open-circuit fault (OCF) of a single IGBT in a two-parallel-connected three-phase AC-DC pulse-width-modulation (PWM) converter system. In the case of the parallel-connected PWM converter system, the OCF of the IGBT causes not only DC-link voltage fluctuation and grid current distortion, but also a zero-sequence circulating current (ZSCC). Although the effect of these problems can be reduced by existing FTC methods which is used in the single PWM converter, it is difficult to totally mitigate the problems due to the ZSCC. Therefore, this paper proposes a new FTC strategy to suppress the ZSCC using the healthy converter in the parallel-connected converter. First, it is analyzed how the difference in common-mode (CM) voltage between the two converters causes ZSCC flowing inside the parallel-connected converter under the fault condition. And then, the limitation of the existing control method for ZSCC is explained. To suppress the ZSCC using the healthy converter, the proposed control method uses a d-axis voltage injection of the healthy converter which does not affect an active power control. The effectiveness of the proposed FTC strategy is verified through experimental results.

키워드

과제정보

This work was supported by BK21PLUS, Creative Human Resource Development Program for IT Convergence.

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피인용 문헌

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  2. Open-Circuit Fault Tolerance Method for Three-Level Hybrid Active Neutral Point Clamped Converters vol.9, pp.9, 2020, https://doi.org/10.3390/electronics9091535
  3. A Current Sensor Fault Tolerant Control Strategy for PMSM Drive Systems Based on Cri Markers vol.14, pp.12, 2020, https://doi.org/10.3390/en14123443