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Open AccessArticle

Strategy Design of Hybrid Energy Storage System for Smoothing Wind Power Fluctuations

by Jingyu Liu 1,* and Lei Zhang 2
1
Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education, School of Electrical Engineering, Shandong University, 17923 Jingshi Road, Jinan 250061, China
2
94710 of The Chinese People’s Liberation Army, No. 1 Airport Branch Road, Wuxi 214000, China
*
Author to whom correspondence should be addressed.
Academic Editor: Frede Blaabjerg
Energies 2016, 9(12), 991; https://doi.org/10.3390/en9120991
Received: 10 October 2016 / Revised: 16 November 2016 / Accepted: 21 November 2016 / Published: 25 November 2016
(This article belongs to the Special Issue Wind Turbine 2017)
With the increasing contribution of wind power plants, the reliability and security of modern power systems have become a huge challenge due to the uncertainty and intermittency of wind energy sources. In this paper, a hybrid energy storage system (HESS) consisting of battery and supercapacitor is built to smooth the power fluctuations of wind power. A power allocation strategy is proposed to give full play to the respective advantages of the two energy storage components. In the proposed strategy, the low-frequency and high-frequency components of wind power fluctuations are absorbed by battery groups and supercapacitor groups, respectively. By inhibiting the low-frequency components of supercapacitor current, the times of charging-discharging of battery groups can be significantly reduced. A DC/AC converter is applied to achieve the power exchange between the HESS and the grid. Adjustment rules for regulating state-of-charge (SOC) of energy storage elements are designed to avoid overcharge and deep discharge considering the safety and the high efficiency of the energy storage elements. Experimental results on the test platform verify the effectiveness of the proposed power allocation strategy in DC/AC converter and battery SOC adjustment rules for regulating SOC levels. View Full-Text
Keywords: wind power; battery; supercapacitor; state-of-charge (SOC); power allocation; hybrid energy storage system (HESS); wind power regulation system wind power; battery; supercapacitor; state-of-charge (SOC); power allocation; hybrid energy storage system (HESS); wind power regulation system
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MDPI and ACS Style

Liu, J.; Zhang, L. Strategy Design of Hybrid Energy Storage System for Smoothing Wind Power Fluctuations. Energies 2016, 9, 991.

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