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Energies 2017, 10(5), 606; doi:10.3390/en10050606

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

1
Department of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China
2
Department of Electronic and Electrical Engineering, University of Bath, Bath BA2 7AY, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Chi-Ming Lai
Received: 20 March 2017 / Revised: 24 April 2017 / Accepted: 25 April 2017 / Published: 1 May 2017
(This article belongs to the Section Energy Storage and Application)
View Full-Text   |   Download PDF [2227 KB, uploaded 1 May 2017]   |  

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. View Full-Text
Keywords: battery; supercapacitor; combined heat and power (CHP); hybrid energy storage system; optimization; building level battery; supercapacitor; combined heat and power (CHP); hybrid energy storage system; optimization; building level
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Yu, D.; Liu, H.; Yan, G.; Jiang, J.; Le Blond, S. Optimization of Hybrid Energy Storage Systems at the Building Level with Combined Heat and Power Generation. Energies 2017, 10, 606.

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