An SOC-based Adaptive Control Strategy for Pulsed Power Elimination in Hybrid Energy Storage System

The technology of energy storage has attracted more and more attention. Compared to traditional battery-only energy storage system, hybrid energy storage system (HESS) composed of battery and supercapacitor can meet the steady state power requirement and transient power fluctuation simultaneously. The pulsed power allocation between battery and supercapacitor, based on their complementary characteristics is the key challenge in realizing its practical applications. In this paper, a control strategy utilizing low pass filter with SOC-based adaptive time constant is proposed, which considers the SOCs of energy storage devices. The proposed strategy can enhance the absorption of pulsed power by HESS and optimize its overall performance. Simulation and experimental results are provided to verify the effectiveness and feasibility of the control strategy.