Research on SOC equalization control strategy of chain-type energy storage converter

Le résumé fourni par la source

As the “dual carbon” goals are increasingly advanced and high-voltage, high-power energy storage applications continue to develop rapidly, energy storage converters—serving as the critical interface between the energy storage system and the grid—are susceptible to both inter-phase and intra-phase State of Charge (SOC) imbalances. These imbalances arise from variations in the parameters of individual battery cells, inconsistencies in their charging and discharging processes, and the unequal power distribution inherent in multi-module cascade configurations. Such imbalances can significantly impact both the operational efficiency and the longevity of the system. Battery life. Traditional SOC equalization control strategies are often hindered by limited economic efficiency, sluggish dynamic response, and inadequate precision, which impede their capability to achieve rapid balancing under intricate operational scenarios. In this study, a cascaded PCS integrated control framework grounded in hierarchical control is developed to enhance both inter-phase and intra-phase power distribution by dynamically adjusting zero-sequence voltage alongside fundamental voltage components, thereby improving SOC balancing efficacy. Simulation outcomes reveal that the proposed approach can diminish the initial SOC discrepancy by approximately 5% within 20 seconds across both charging and discharging modes. In addition, it substantially accelerates dynamic response and reinforces system stability, offering a solid theoretical basis for the engineering design and practical application of high-voltage, large-capacity energy storage systems.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.