Optimal sizing of battery energy storage system in microgrid system considering load shedding scheme

Author(s): Thongchart Kerdphol, Yaser Qudaih, Yasunori Mitani, Princess Garasi
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. 4, no. 1, January 2015: pp. 22-29
ISSN: 2315-4462 (Print)
ISSN: 2373-3594 (Online)
Digital Object Identifier: 10.12720/sgce.4.1.22-29

Abstract: In the past, Battery Energy Storage System (BESS) is used for primary frequency regulation. As developments in batteries progress, advancement in applications of BESS including the implementation in high power penetration is expected. Load shedding is one of frequency control methods during stand-alone operation, and the performance of frequency control improves in combination with BESS. However, without optimal size of BESS, it can cause the oscillations to the system. Thus, this article proposes the feasibility of using optimal BESS with load shedding scheme when the microgrid is disconnected from a main source. In this paper, the analytic algorithm-based DPL (DIgSILENT Programming Language) script is developed and presented to determine the optimal size of BESS with load shedding scheme. Results show that the optimal size of BESS-based analytic algorithm with load shedding scheme can achieve higher performance of frequency control compared to the BESS without optimal size. The optimal sizing method of BESS with load shedding scheme is achieved by using a tool for analysis of industrial, utility and commercial electrical power system called DPL script.

Keywords: Battery energy storage system, dynamic system, frequency control, load shedding, optimal sizing method

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