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Electrolyte Flow Rate Control for Vanadium Redox Flow Batteries using the Linear Parameter Varying Framework Ryan McCloy, Yifeng Li, Jie Bao∗, Maria Skyllas-Kazacos School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia Abstract In this article, an electrolyte flow rate control approach is developed for an all-vanadium redox flow battery (VRB) system based on the linear parameter varying (LPV) framework. The electrolyte flow rate is regulated to provide a trade-off between stack voltage efficiency and pumping energy losses, so as to achieve optimal battery energy efficiency. The nonlinear process model is embedded in a linear parameter varying state-space description and a set of state feedback controllers are designed to handle fluctuations in current during both charging and discharging. Simulation studies have been conducted under different operating conditions to demonstrate the performance of the proposed approach. This control approach was further implemented on a laboratory scale VRB system. Keywords: vanadium redox flow batteries, linear parameter varying systems, flow rate control, nonlinear dynamics 1. Introduction The all-vanadium redox flow battery (VRB) has attracted significant research interest, since it was invented by Skyllas-Kazacos and co-workers [1, 2] in the 1980s, largely due to its widely recognised potential for large scale energy storage applications. Despite its increasing interest, few 5 contributions have focused on the development of targeted control system design as an approach to bringing to fruition the VRB’s potential through improved performance and efficiency, particularly in dealing with time-varying charging/discharging power (or current). ∗Corresponding author. ∗∗Y. Li is currently with the Voith Group, Germany. Email addresses: r.mccloy@unsw.edu.au (Ryan McCloy), yifeng.li@voith.com (Yifeng Li), j.bao@unsw.edu.au (Jie Bao), M.Skyllas-Kazacos@unsw.edu.au (Maria Skyllas-Kazacos) Preprint submitted to Journal of Process Control May 10, 2022 arXiv:2201.12812v2 [eess.SY] 9 May 2022PDF Image | Electrolyte Flow Rate Control Vanadium Redox Flow Batteries
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