Distributed control method and system for hybrid energy storage network-oriented converter

Abstract

This invention relates to the field of electrical engineering and addresses the problem that grid-connected converters struggle to effectively distinguish between high and low frequency power components, leading to uneven power distribution and accelerated battery life loss. Specifically, it focuses on a distributed control method and system for hybrid energy storage grid-connected converters. The invention connects energy-type and power-type energy storage to the AC grid via a grid-connected converter. Based on VSG control, transient virtual impedance control is added to suppress the response of energy-type energy storage to transient power, achieving dynamic decoupling of high and low frequency power required by HESS (Hybrid Energy Storage System). Then, according to a distributed control strategy based on multi-agent consensus theory, each grid-connected converter only needs sparse communication with adjacent nodes to collaboratively achieve error-free frequency regulation and precise on-demand allocation of steady-state power. An event-triggered mechanism is incorporated to reduce communication burden and adjust the power reference values ​​of each unit.

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