Energy Storage Science and Technology ›› 2017, Vol. 6 ›› Issue (1): 78-84.doi: 10.12028/j.issn.2095-4239.2016.0006

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Flexible charge-discharge control of vanadium redox battery

QIU Ya1, LI Xin2, WEI Da1, YU Ling2   

  1. 1School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, Anhui, China;
    2 Hunan DOVOP Electric incorporated company, Shaodong 422800, Hunan, China
  • Received:2016-03-28 Revised:2016-05-26 Online:2017-01-03 Published:2017-01-03

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Abstract: Vanadium Redox Battery (VRB) has the advantages of large capacity, long service, safety and environmentally friendly. In order to ensure safe charge-discharge and increase the charge speed of Vanadium Redox Battery (VRB), the three closed-loop flexible charge-discharge control strategy which is based on estimated core voltage is proposed. This strategy uses three closed-loop structure, namely SOC loop, voltage loop and current loop. PI regulator with the limit value is used in these three loops. It determines the battery to charge or discharge by comparing the given SOC value and actual SOC value in SOC outer loop. The estimated core voltage is used as feedback in voltage loop, achieving constant voltage charge of VRB. Current loop can achieve constant current charge of VRB. Kernel voltage can be estimatyed by VRB voltage, charge and discharge current and reference model. Finally, a 5 kW/30 kW·h VRB model is builded on Simulink to verify the characteristic of VRB. The results show that the charge time decreases by nearly 40% via using the control strategy, which also ensures the core voltage non-overshoot and achieves safe charge-discharge of VRB.

Key words: vanadium redox battery (VRB), flexible charge-discharge control, estimated core voltage, three closed-loop