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Dynamic Simulation and Control of a Battery Energy Storage System

This paper presents a dynamic simulation study of a grid-connected Battery Energy Storage System (BESS), which is based on an integrated battery and power conversion system. The battery system model is established by separating the model into a nonlinear open circuit voltage, based on an estimated state of charge and a first order resistance capacitance model. The power conversion system model is comprised of a constant dc link, a voltage source inverter, and a filter. A sinusoidal pulse width modulation is developed to generate the switching pattern for the voltage source inverter. A novel closed loop control strategy with robust controllers is proposed to ensure the reference power extraction from the system to the grid. The proposed modeling and control strategy is validated by applying a dynamic power reference to the system in the Matlab-Simulink™ environment. The simulation results show that the modeling and control strategy can ensure BESS performance with fast response and high accuracy.