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

The Korean Institute of Power Electronics (전력전자학회)
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A Study on Constant Power Generation Algorithms for a Whole Range Power Point Tracking in Photovoltaic Systems

태양광 시스템의 전 범위 전력점 추종을 위한 CPG 알고리즘에 관한 연구

  • Yang, Hyoung-Kyu (School of Electrical and Electronic Eng., Yonsei Univ.) ;
  • Bang, Taeho (School of Electrical and Electronic Eng., Yonsei Univ.) ;
  • Bae, Sunho (Advanced Converter R&D Part, Digital Transformation Center, LSIS Co., LTD.) ;
  • Park, Jung-Wook (School of Electrical and Electronic Eng., Yonsei Univ.)
  • Received : 2018.09.18
  • Accepted : 2018.11.19
  • Published : 2019.04.20
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Abstract

In this study, constant power generation (CPG) algorithms are introduced for whole range power point tracking in photovoltaic systems. Currently, maximum power point tracking (MPPT) algorithm is widely used for high-power photovoltaic systems. However, MPPT algorithm cannot flexibly control such systems according to changing grid conditions. Maintaining grid stability has become important as the capacity of grid-connected photovoltaic systems is increased. CPG algorithms are required to generate the desired power depending on grid conditions. A grid-connected photovoltaic system is configured, and CPG algorithms are implemented. The performances of the implemented algorithms are compared and analyzed by experimental results.

Keywords

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Fig. 1. Grid-connected PV system configuration.

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Fig. 2. A flowchart of the whole range power point tracking.

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Fig. 3. A CPG algorithm block of the Left-CPG method.

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Fig. 4. A P-V curve of the Left-CPG method.

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Fig. 5. A CPG algorithm block of the IncCond-CPG method.

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Fig. 6. A P-V curve of the IncCond-CPG method.

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Fig. 7. A flowchart of the whole range power point tracking with proposed CPG method.

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Fig. 8. Hardware set-up for experimental test.

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Fig. 9. PV power conditioning system(PCS) of 4 kW.

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Fig. 10. Experiment results of the Left-CPG method at grid-connection: (a) on the P-V curve and (b) in time.

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Fig. 11. Experiment results of the IncCond-CPG method at grid-connection: (a) on the P-V curve and (b) in time.

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Fig. 12. Experiment results of the Left-CPG method with irradiation decrease: (a) on the P-V curve and (b) in time.

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Fig. 13. Experiment results of the IncCond-CPG method with irradiation decrease: (a) on the P-V curve and (b) in time.

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Fig. 14. Experiment results of the Left-CPG method with irradiation increase: (a) on the P-V curve and (b) in time.

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Fig. 15. Experiment results of the IncCond-CPG method with irradiation increase: (a) on the P-V curve and (b) in time.

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Fig. 16. Experiment results of the Left-CPG method in a given situation.

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Fig. 17. Experiment results of the IncCond-CPG method in a given situation.

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Fig. 18. Experiment results of the proposed CPG method in a given situation.

TABLE I PARAMETERS OF PV ARRAY

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TABLE II PARAMETERS OF THE PV SYSTEM

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