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

  • 제26권3호
  • /
  • Pages.227-236
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  • 2021
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  • 1229-2214(pISSN)
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  • 2288-6281(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
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태양광 발전 시스템용 3-레벨 부스트 컨버터 제어기 설계에 관한 연구

A Study on the Controller Design of the Three-Level Boost Converter for Photovoltaic Power Conditioning System

  • Lee, Kyu-Min (Dept. of Electrical Engineering, Korea Nat'l University of Transportation) ;
  • Kim, Il-Song (Dept. of Electrical Engineering, Korea Nat'l University of Transportation)
  • 투고 : 2020.12.06
  • 심사 : 2021.02.01
  • 발행 : 2021.06.20
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초록

This research proposes a modeling and controller design of a three-level boost (TLB) converter for the implementation of maximum power point tracking (MPPT) in the photovoltaic power conditioning system (PCS). Contrary to the output voltage control of the conventional controller, the Photovoltaic PCS requires an input voltage controller for MPPT operation. A TLB converter has the advantage of decreasing the inductor size and increasing efficiency compared with the existing booster converter. However, an optimal controller is difficult to design due to the complexity of the TLB operations, which have two operational modes on the duty ratio boundary of 0.5. Therefore, the unified linear model equations of the TLB converters, which can be applicable to both operational modes, are derived using linearized solar cell expressions. Furthermore, the transfer functions are obtained for the controller design. The MPPT voltage controller is designed using MATLAB SISOTOOL. In addition, a controller for capacitor voltage unbalancing is described and designed. The simulations and experimental verifications are conducted to verify the effectiveness of the small-signal analysis and control system design.

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과제정보

이 논문은 2021년 한국연구재단 기초연구과제(2018R1D1A1B07041728)와 2021년 증소기업연구인력지원사업(S2928638) 연구비 지원으로 작성되었습니다.

참고문헌

  1. K. J. Lee, R. Y. Kim, and D. S. Hyun, "An adaptive maximum power point tracking scheme based on a variable scaling factor for photovoltaic systems," The Transactions of the Korean Institute of P ower Electronics, Vol. 17, No. 5, pp. 423-430, Oct. 2012.
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  3. C. M. Kim and J. S. Kim, "Comparative analysis of efficiency and power density of single-phase and 3-level boost converters for PV system," The Transactions of the Korean Institute of P ower Electronics, Vol. 25, No. 2, pp. 127-132, Oct. 2020.
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  7. M. H. L, J. W. Kim, and J. Lai. "Small-signal modeling of three-level boost rectifier and system design for medium-voltage solid-state transformer," in 2019 10th International Conference on Power Electronics and ECCE Asia, Busan, Korea, 2019.
  8. K. M. Lee, I. S. Kim. "Modeling and controller design of three-level boost converter in photovoltaic power conditioning system", The Korean Institute of Power Electronics Annual Conference, pp. 202-204, Aug. 2020
  9. H. C. Chen and W. J. Lin, "MPPT and voltage balancing control with sensing only inductor current for photovoltaic-fed, three-level, boost-type converters," IEEE Transactions on Power Electronics, Vol. 29, No. 1, pp. 29-35, Jan. 2014. https://doi.org/10.1109/TPEL.2013.2262056
  10. H. C. Chen and J. Y. Liao, "Design and implementation of sensorless capacitor voltage balancing control for three-level boosting PFC," IEEE Transactions on Power Electronics, Vol. 29, No. 7, pp 3808-3817, Jul. 2014. https://doi.org/10.1109/TPEL.2013.2279718
  11. S. U. Seo, K. J. Lee, R. Y. Kim, and D. S. Hyun, "Improved modeling and control of boost-flyback converter with high step-up voltage ratio," The Transactions of the Korean Institute of Power Electronics, Vol. 17, No. 1, pp. 67-76, Feb. 2012. https://doi.org/10.6113/TKPE.2012.17.1.67