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

The Korean Institute of Power Electronics (전력전자학회)
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Photovoltaic Generation by Parallel Driving of Modified Buck-boost Converter

변형된 승강압 컨버터의 병렬구동에 의한 태양광발전

  • Published : 2004.10.01
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Abstract

In this paper, a modified converter is presented and analyzed to use as a photovoltaic converter. And also a new parallel driving scheme is proposed to increase output power and to reduce the output voltage ripple. The ratio of the output to the input voltage of the modified converter is equal to that of the boost converter. The difference between both converters is the composition of output terminal. Owing to the discrepancy, a working voltage of the output capacitor of the modified converter becomes lower, thus the capacitance value of the capacitor can be smaller than that of the boost converter. The proposed parallel driving is based on the modified converter and a current-mode-control method. It gives a good solution for alleviating the current sharing unbalance problem of conventional parallel operations. It reduces the output voltage ripple by means of increasing the equivalent switching frequency without additional switching losses. The validity of the proposed parallel driving strategy is verified through computer-aided simulations and experimental results.

본 논문에서는 태양광 컨버터로서 변형된 벅-부스트 컨버터를 제안하고 분석하며, 출력을 증가시키고 출력전압의 리플을 저감하기 위한 새로운 병렬 구동 기법을 제안한다. 변형된 컨버터의 입ㆍ출력 관계는 기존의 승압형 컨버터인 부스트 컨버터와 동일하지만, 출력단자의 구성을 변형시켜 출력 콘덴서의 동작전압과 커패시턴스 용량을 저감시킬 수 있는 장점을 가진다. 또한 변형된 컨버터와 전류 제어 기법을 이용하는 제안된 병렬구동 기법은 기존병렬 구동 방식의 전류 분배에 대한 불평등 문제를 해결할 수 있으며, 부가적인 스위칭 손실의 증가 없이 등가 스위칭 주파수를 증가 시킬 수 있어 출력전압 리플 저감에 효과적이다. 제안된 병렬 구동 기법의 타당성을 컴퓨터 시뮬레이션과 실험을 통하여 입증한다.

Keywords

References

  1. M. H. Rashid, Power Electronics Handbook, Academic Press, 2001, pp. 539-562
  2. 유권종, 최주엽, '태양광발전시스템에서의 전력전자기술', 전력전자학회지, 제 8권, 제 4호, 2003년 8월
  3. Michihiko Nagao, and Koosuke Harada, 'Power Flow of Photovoltaic System using Buck-Boost PWM Power Inverter,' in Proc. of IEEE PEDS, 1997, pp. 144-149
  4. Johanna M. A. Myrzlk, 'Novel Inverter Topologies for Single-Phase Stand-Alone or Grid Connected Photo-voltaic Systems,' in Proc. IEEE PEDS 2001, pp. 103-108
  5. H. Watanable et al., 'A Novel Unity Interactive Photovoltaic Inverter,' in Proc. of IEEE IECON, 1999, pp. 721-725
  6. B. K. Bose et al., 'Microcomputer Control of a Residential Photovoltaic Power Conditioning System', IEEE Trans. on Industry Applications, lA-215, pp. 1182-1191, 1985
  7. S. Nonaka, 'A Novel Three-Phase Sinusoidal PWM Voltage Source Inverter and its Application for Photovoltaic Power Generation System,' in Proc. of IEEE PCC, 1997, pp. 755-761
  8. G. Keller et al., 'Module Orientated Photovoltaic Inverters A Comparison of Different Circuits', in Proc. of IEEE WCPEC, 1994, pp. 929-932
  9. P. W. Lee, Y. S. Lee, D. K. W. Cheng, and X. C. Liu, 'Steady-State Analysis of an Interleaved Boost Converter with Coupled Inductors,' IEEE Trans. on Ind. Electron., Vol. 47, No. 4, pp. 787-795, 2000 https://doi.org/10.1109/41.857959
  10. M. S. Elmore, 'Input current ripple cancellation in synchronized, parallel connected critically continuous boost converters,' in Proc. of IEEE APEC, 1996, pp. 152-158
  11. L. Balogh and R. Redl, 'Power- factor correction with interleaved boost converters in continuous-inductor-current mode,' in Proc. of IEEE APEC, 1993, pp. 168-174
  12. J. W. Kolar, G. R. Kamath, N. Mohan, and F. C. Zach, 'Self- adjusting input current ripple cancellation of coupled parallel connected hysteresis-controlled boost power factor corrections,' in Proc. of IEEE PESC, 1995, pp. 164-173
  13. R. Lenk, Practical Design of Power Supplies, McGRAW-HILL & IEEE Press, pp. 6-29, 1998
  14. Abraham I. Pressman, Switching Power Supply Design, McGraw-Hill, Inc., 1991
  15. Mohan N., Underland T. M., Robbins W. P., 1995. Power Electronics: converters, Applications, and Design, JOHN WILEY & SONS, Inc., pp. 161-184
  16. C. Hua, J. Lin, and C. Shen, 'Implementation of a DSP-controlled photovoltaic system with peak power tracking,' IEEE Trans. on Ind. Electron., Vol. 45, No. 1, pp. 99-107, 1998