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Modeling and simulation method and system for series capacity equivalent model of large-scale energy storage power station

An equivalent model and energy storage power station technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems that the research content still needs to be perfected

Pending Publication Date: 2021-05-25
CHINA ELECTRIC POWER RES INST
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  • Application Information

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Problems solved by technology

[0003] At present, scholars have successively carried out simulations on battery packs, but they mainly focus on small-scale battery series-parallel experiments or battery group modeling with good consistency, and the relevant research content still needs to be improved.

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  • Modeling and simulation method and system for series capacity equivalent model of large-scale energy storage power station
  • Modeling and simulation method and system for series capacity equivalent model of large-scale energy storage power station
  • Modeling and simulation method and system for series capacity equivalent model of large-scale energy storage power station

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Experimental program
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Embodiment approach

[0058] Explanation of related technical terms

[0059] First-order Thevenin model: As shown in Figure 6(a), an equivalent circuit model of a battery is composed of open-circuit voltage, ohmic internal resistance and a first-order polarized RC circuit. Using the ampere-hour integration method;

[0060]

[0061] SOH: state of health battery health status, which is the ratio of the current maximum capacity of the battery to the factory rated capacity

[0062] SOC: state of charge battery state of charge, which is the ratio of the current remaining capacity of the battery to the maximum capacity of the current state of the battery

[0063] BMS: battery management system battery management system.

[0064] Such as figure 1 As shown, the present invention proposes a modeling method for the equivalent model of the series capacity of a large-scale energy storage power station, including the following steps:

[0065] S1. Obtain a simple Thevenin model and battery string paramete...

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Abstract

The invention provides a modeling and simulation method and system for a series capacity equivalent model of a large-scale energy storage power station, and the method comprises the steps: correcting a simple Thevenin model into a series capacity equivalent model through the terminal voltage difference value and the equivalent calculation capacitance value of a simple Thevenin model and a detailed model, and based on an actual grouping structure of the power station during simulation, carrying out an accelerated aging experiment on the battery, and the modeling accuracy is improved within a longer time scale by analyzing the relationship between the single battery and the grouped external characteristics, fully considering the unbalanced current between the battery strings and utilizing the created string capacity equivalent model and the grouped parallel equation set.

Description

technical field [0001] The invention relates to the technical field of power circuit modeling, in particular to a modeling and simulation method and system for a large-scale energy storage power station series capacity equivalent model. Background technique [0002] At present, the modeling of the DC side of large-scale energy storage is often simplified to an equivalent single battery model, ignoring the differences in internal battery parameters. In fact, due to the manufacturing process of the battery, the monomers in the energy storage power station show inconsistencies, and as the work process intensifies, the capacity of the electrochemical energy storage connected to the grid continues to increase, and its impact on the power system The impact is also becoming more and more obvious, and the construction of an accurate energy storage system equivalent model has become one of the problems that need to be solved urgently in the field of power system simulation. The mode...

Claims

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Application Information

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IPC IPC(8): G06F30/3323G06F30/3308
CPCG06F30/3308G06F30/3323
Inventor 牛萌刘璐李蓓李相俊马会萌修晓青徐少华闫涛贾学翠
Owner CHINA ELECTRIC POWER RES INST