Enhancing Control Strategy Hybrid Energy Storage System for Improve Transient Response Using an Adaptive Low-Pass Filter in DC Microgrid

Power generation from renewable energy sources, such as photovoltaic (PV) systems, is subject to fluctuations over time, which can negatively affect power quality, transient stability, and reliability. A Hybrid Energy Storage System (HESS) combining technologies with both high power density and high energy density, such as batteries and supercapacitors (SC), can mitigate the power fluctuations. The use of a constant Lowpass Filter (LPF) to manage the HESS performance has both advantages and disadvantages. Typically, the LPF value should divide the roles of the storage components equally, accounting for both controller response and State of Charge (SoC). In this study, a novel control scheme, termed adaptive LPF, which aims to enhance controller performance by dynamically adjusting to changing conditions, is proposed. The adaptive LPF value has been determined based on deviations from the initial LPF setting and the compensation current. Simulation results by using MATLAB-Simulink have indicated that the adaptive LPF-based controller scheme improved voltage recovery by 10.70-17.34%, compared with systems using only a constant LPF.