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System Unbalance Analyses and Improvement for Rooftop Photovoltaic Generation Systems in Distribution Networks

Author

Listed:
  • Rong-Ceng Leou

    (Department of Electrical Engineering, Cheng Shiu University, Kaohsiung 83347, Taiwan)

  • Jen-Hao Teng

    (Department of Electrical Engineering, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan)

  • Yun-Fang Li

    (Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 31057, Taiwan)

  • Wei-Min Lin

    (Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 31057, Taiwan)

  • Yu-Hung Lin

    (Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 31057, Taiwan)

Abstract

This paper studies the system unbalance caused by rooftop Photovoltaic Generation Systems (PVGSs) in distribution networks and proposes an improved method. The voltage and current unbalance studies for three extreme cases considering all rooftop PVGSs being connected to one single phase and then the stochastic analyses for the integration cases of rooftop PVGSs are considered. These three extreme cases lead to severe system unbalance problems. An improving method that combines the On Load Tap Changer (OLTC) and the optimal phase arrangement of distribution transformers is proposed in this paper to mitigate the system unbalance. The OLTC-based improving method is applied first. If the system unbalance is still out of range, the optimal phase arrangement of distribution transformers is further used to mitigate the system unbalance problem. The objective function of optimal phase arrangement is to minimize the system unbalance with the constraints of voltage limits, line flow limit, etc. Test results show that the proposed method can improve the system unbalance significantly even under very extreme cases.

Suggested Citation

  • Rong-Ceng Leou & Jen-Hao Teng & Yun-Fang Li & Wei-Min Lin & Yu-Hung Lin, 2020. "System Unbalance Analyses and Improvement for Rooftop Photovoltaic Generation Systems in Distribution Networks," Energies, MDPI, vol. 13(8), pages 1-18, April.
  • Handle: RePEc:gam:jeners:v:13:y:2020:i:8:p:1996-:d:346918
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    References listed on IDEAS

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    1. Haque, M. Mejbaul & Wolfs, Peter, 2016. "A review of high PV penetrations in LV distribution networks: Present status, impacts and mitigation measures," Renewable and Sustainable Energy Reviews, Elsevier, vol. 62(C), pages 1195-1208.
    2. Muruganantham, B. & Gnanadass, R. & Padhy, N.P., 2017. "Challenges with renewable energy sources and storage in practical distribution systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 73(C), pages 125-134.
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