Author(s): Masanori Tokumitsu, Shohei Haga, Yaser Qudaih, Masayuki Watanabe, Yasunori Mitani
Department of Electrical and Electronics Engineering, Kyushu Institute of Technology, Kitakyushu-shi, Fukuoka, 804-8550, Japan
International Journal of Smart Grid and Clean Energy, vol. 3, no. 4, October 2014: pp. 380-384
ISSN: 2315-4462 (Print)
ISSN: 2373-3594 (Online)
Digital Object Identifier: 10.12720/sgce.3.4.380-384

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Abstract: This study assumes a case installing photovoltaics (PV) and gas cogenerations (GC) with connections to distribution system in most of houses, which makes an issue of rising voltage. Generally, rising voltage is controlled by lowering the feeder voltage by Load Ratio control Transformer (LRT). However, it cannot sufficiently operate against too many PVs in the distribution lines. In this paper analysis of the voltage profiles in this difficult situation and basic examination of operation method to solve the problem are presented. First, the simulation model representing the distribution systems in detail is introduced. Proper tap position settings to consider the sudden changes of PV generation are considered to avoid the violation of voltage limit. In addition GC power generation which can operate to support the shortage of power supply is considered to achieve a stable power system operation without voltage violation. The results, voltage deviation has occurred in the introduction rete of 80%. However, the stoppage of the operation of GC at a terminal, voltage within the allowable limits is obtained.

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Keywords: Photovoltaics, gas cogeneration, demand response, voltage rise

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