An equivalent method for an all-vanadium redox flow battery energy storage system based on electrothermal coupling

Abstract

The invention discloses an equivalent method of an all-vanadium redox flow battery energy storage system based on electrothermal coupling, comprising steps: 1. Modeling the electrical characteristics of VRB according to the second-order resistance-capacitance network; 2. Using particle swarm algorithm to calculate parameters Identification; 3. Analyze the heat production of each module during battery operation; 4. Analyze the heat transfer process of the VRB system; 5. Equivalent the heat transfer path based on the electrothermal analogy principle; 6. Combine steps 2 and 5 The obtained states are combined to obtain the state space equation of the complete electrothermal coupling model of the VRB energy storage system. The invention comprehensively considers the electrical characteristics and heat generation characteristics of the VRB energy storage system during operation and the coupling relationship between the two, and can accurately predict the state of charge, terminal voltage and temperature state of each part of the battery, effectively ensuring the VRB energy storage system. safe and stable operation.

Description

technical field [0001] The invention relates to the technical field of electric power system battery modeling, specifically refers to an equivalent method for an all-vanadium redox flow battery energy storage system based on electrothermal coupling, and proposes an electrical equivalent model suitable for power grid energy storage system simulation. Background technique [0002] With the aggravation of environmental pollution and energy crisis, it is particularly important to use renewable energy such as solar energy, wind energy, and water energy to generate electricity. However, the inherent randomness and intermittent characteristics of renewable energy seriously hinder the safe and economical operation of the grid system. The dispatchability of the energy storage system can effectively improve the problems caused by the instability of new energy power generation. All-vanadium redox flow batteries have become one of the preferred technologies for large-scale energy stora...

AI Technical Summary

Problems solved by technology

Improper temperature control will lead to precipitation of reactants and even blockage of flow channels, which will affect the safe and efficient operation of the battery

However, the existing electrical equivalent models do not consider the influence of temperature on the external characteristics of flow batteries

In the current research, the patent "An Equivalent Simulation Method for All Vanadium Redox Flow Battery Energy Storage System" (Patent No.: 201410089721.4) proposed a second-order dynamic equivalent model; ") compared and analyzed the basic principles and respective characteristics of different equivalent circuit models, and proposed a commonly used equivalent model; The vanadium redox flow battery energy storage system modeling research is carried out. In this paper, it is assumed that the temperature remains constant during the reaction process, and the error caused by the large difference between the set temperature and the actual operating temperature is not considered.

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