Optimization of Hybrid Energy Storage Systems at the Building Level with Combined Heat and Power Generation

Dongmin Yu, Huanan Liu, Gangui Yan, Jing Jiang and Simon Le Blond
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Dongmin Yu: Department of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China
Huanan Liu: Department of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China
Gangui Yan: Department of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China
Jing Jiang: Department of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China
Simon Le Blond: Department of Electronic and Electrical Engineering, University of Bath, Bath BA2 7AY, UK

Energies, 2017, vol. 10, issue 5, 1-15

Abstract: The average daily benefit to cost ratio of a building energy storage system is mainly constrained by the battery lifetime. This paper aims to minimize the average daily cost of a hybrid energy storage system (HESS) (comprised of a battery and supercapacitor) by optimizing the battery capacity. A novel optimization model is proposed with the objective to find the minimum average daily investment cost of the HESS. The objective function has two parts: (1) the investment cost formula for the battery is derived as a function of the battery capacity, which has an interdependence with the minimum state of charge (SOC) and the maximum discharge current; (2) the investment cost formula for the supercapacitor is also established as a function of battery capacity by matching the maximum battery power with that of the supercapacitor. Case studies demonstrate several ways to increase the average daily benefit to cost ratio: (1) adopting a suitable control strategy to avoid capacity saturation; (2) reducing the battery SOC to increase the threshold for the maximum discharge current (MDC) saturation; and (3) increasing MDC to raise the threshold for the SOC saturation. Results show that the average daily benefit to cost ratio is doubled compared to previous work.

Keywords: battery; supercapacitor; combined heat and power (CHP); hybrid energy storage system; optimization; building level (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: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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