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

Rong-Ceng Leou, Jen-Hao Teng, Yun-Fang Li, Wei-Min Lin and Yu-Hung Lin
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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

Energies, 2020, vol. 13, issue 8, 1-18

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.

Keywords: Rooftop Photovoltaic Generation Systems; system unbalance; On Load Tap Changer; stochastic analyses; optimal phase arrangement (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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