Design of Hybrid Energy Storage Control System for Wind Farms Based on Flow Battery and Electric Double-Layer Capacitor

An energy storage system (ESS) in a wind farm is required to be able to absorb wind power fluctuations during gusts, and improve the power quality and stability. This paper puts forward a flow-battery and electric double-layer capacitor (EDLC) hybrid ESS to provide both large power and energy capacity. The hybrid ESS is connected to the point of common coupling. Flow-battery is directly connected to the ESS dc bus while the EDLC has a dc/dc IGBT converter interface. The dc bus voltage varies within a certain range determined by the variable battery terminal voltage. With the EDLC absorbing high-frequency power surges, battery power rating, degree of discharge, and power losses are all reduced. Therefore the battery in the hybrid ESS has low cost and high longevity; and the system overall efficiency is enhanced. Fluctuations in the active and reactive power of the wind farm are compensated with four-quadrant power operation of hybrid ESS. The energy storage is optimized by properly designing the bandwidth of flow-battery and EDLC power regulator. Simulation results show the effectiveness of the control strategy of the hybrid ESS.

[1]  T. Funaki,et al.  A Study of Output Terminal Voltage Modeling for Redox Flow Battery Based on Charge and Discharge Experiments , 2007, 2007 Power Conversion Conference - Nagoya.

[2]  G. Joos,et al.  Comparison of Energy Storage System Technologies and Configurations in a Wind Farm , 2007, 2007 IEEE Power Electronics Specialists Conference.

[3]  Mike Barnes,et al.  Power quality and stability improvement of a wind farm using STATCOM supported with hybrid battery energy storage , 2006 .

[4]  T. A. Smith,et al.  Using supercapacitors to improve battery performance , 2002, 2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289).

[5]  G. Joos,et al.  Supercapacitor Energy Storage for Wind Energy Applications , 2007, IEEE Transactions on Industry Applications.

[6]  T. Nanahara,et al.  New Control Method for Regulating State-of- Charge of a Battery in Hybrid Wind Power/Battery Energy Storage System , 2006, 2006 IEEE PES Power Systems Conference and Exposition.

[7]  S.A. Lone,et al.  Integrating a Redox Flow Battery System with a Wind-Diesel Power System , 2006, 2006 International Conference on Power Electronic, Drives and Energy Systems.

[8]  T.M. Undeland,et al.  An Interface Converter with Reduced VA Ratings for Battery-Supercapacitor Mixed Systems , 2007, 2007 Power Conversion Conference - Nagoya.

[9]  N. Tokuda,et al.  Vanadium redox-flow battery for a variety of applications , 2001, 2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262).

[10]  Gengyin Li,et al.  Research on Energy Efficiency of Supercapacitor Energy Storage System , 2006, 2006 International Conference on Power System Technology.

[11]  G. Joos,et al.  A power electronic interface for a battery supercapacitor hybrid energy storage system for wind applications , 2008, 2008 IEEE Power Electronics Specialists Conference.

[12]  Yoichi Hori,et al.  An Interface Converter with Reduced Volt-Ampere Ratings for Battery-Supercapacitor Mixed Systems , 2008 .

[13]  Chengxiong Mao,et al.  Use of Battery Energy Storage System to Improve the Power Quality and Stability of Wind Farms , 2006, 2006 International Conference on Power System Technology.