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Energies 2014, 7(10), 6620-6644; doi:10.3390/en7106620

Real-Time Wavelet-Based Coordinated Control of Hybrid Energy Storage Systems for Denoising and Flattening Wind Power Output

1
Department of Electrical Engineering, Chonnam National University, Gwangju 500-757, Korea
2
Department of Electrical Engineering, Myongji University, Yongin 449-728, Korea
*
Author to whom correspondence should be addressed.
Received: 30 July 2014 / Revised: 25 September 2014 / Accepted: 9 October 2014 / Published: 16 October 2014
(This article belongs to the Special Issue Wind Turbines 2014)
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Abstract

Since the penetration level of wind energy is continuously increasing, the negative impact caused by the fluctuation of wind power output needs to be carefully managed. This paper proposes a novel real-time coordinated control algorithm based on a wavelet transform to mitigate both short-term and long-term fluctuations by using a hybrid energy storage system (HESS). The short-term fluctuation is eliminated by using an electric double-layer capacitor (EDLC), while the wind-HESS system output is kept constant during each 10-min period by a Ni-MH battery (NB). State-of-charge (SOC) control strategies for both EDLC and NB are proposed to maintain the SOC level of storage within safe operating limits. A ramp rate limitation (RRL) requirement is also considered in the proposed algorithm. The effectiveness of the proposed algorithm has been tested by using real time simulation. The simulation model of the wind-HESS system is developed in the real-time digital simulator (RTDS)/RSCAD environment. The proposed algorithm is also implemented as a user defined model of the RSCAD. The simulation results demonstrate that the HESS with the proposed control algorithm can indeed assist in dealing with the variation of wind power generation. Moreover, the proposed method shows better performance in smoothing out the fluctuation and managing the SOC of battery and EDLC than the simple moving average (SMA) based method. View Full-Text
Keywords: wind generation; electrical energy storage system (EESS); real-time wavelet transform; energy management; fluctuation mitigation; real time digital simulation; Ni-MH battery (NB); electric double-layer capacitor (EDLC) wind generation; electrical energy storage system (EESS); real-time wavelet transform; energy management; fluctuation mitigation; real time digital simulation; Ni-MH battery (NB); electric double-layer capacitor (EDLC)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Trung, T.T.; Ahn, S.-J.; Choi, J.-H.; Go, S.-I.; Nam, S.-R. Real-Time Wavelet-Based Coordinated Control of Hybrid Energy Storage Systems for Denoising and Flattening Wind Power Output. Energies 2014, 7, 6620-6644.

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