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Intelligent state judgment and mode switching method for high-voltage direct-hanging type energy storage system

An energy storage system, intelligent judgment technology, applied in the direction of AC network load balancing, electrical components, etc., to achieve the effect of simple judgment method, improved system operation reliability, and accurate judgment results

Inactive Publication Date: 2020-08-18
NANJING INST OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The high-voltage direct-mounted battery energy storage system has the advantages of high access efficiency, but the requirements for its operation safety protection are also more stringent

Method used

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  • Intelligent state judgment and mode switching method for high-voltage direct-hanging type energy storage system
  • Intelligent state judgment and mode switching method for high-voltage direct-hanging type energy storage system
  • Intelligent state judgment and mode switching method for high-voltage direct-hanging type energy storage system

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Embodiment Construction

[0030] The specific implementation of the patent of the present invention will be described more clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0031] Such as figure 1 The H-bridge cascaded high-voltage direct-mounted energy storage system shown mainly includes: power grid, H-bridge cascaded high-voltage direct-mounted PCS, grid-connected inductors and battery units. The grid-connected inductance filters the output current harmonics of the H-bridge cascaded high-voltage direct-mounted PCS; the main circuit of the H-bridge cascaded high-voltage direct-mounted PCS adopts a star connection method and is composed of N H-bridge units. It is to convert direct current and alternating current; the battery unit is composed of multiple battery packs, and is charged and discharged by the power unit module.

[0032] Such as figure 2 As shown in Fig. 1 , the schematic diagram of the principle of comprehensive mul...

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Abstract

The invention discloses an intelligent state judgment and mode switching method for a high-voltage direct-hanging type energy storage system. According to the system, different states such as voltagedrop caused by an external power grid fault, SOC balance degree deviation of an internal battery pack and over-low SOC caused by over-discharge of the battery pack severely influence safe and stable operation of the high-voltage direct-hanging type energy storage system. Therefore, a factor [epsilon] representing the voltage drop amplitude of the power grid, a factor [tau] representing the SOC balance degree of the energy storage battery pack and a factor [rho] representing the SOC discharge depth of the energy storage battery pack are defined for multi-factor system state function derivation;the invention provides an intelligent state judgment and mode switching method for a high-voltage direct-hanging type energy storage system, and the system operation reliability is improved.

Description

technical field [0001] The invention relates to the technical field of high-voltage direct-mounted energy storage, in particular to a comprehensive multi-factor high-voltage direct-mounted energy storage system state intelligent judgment and mode switching method. Background technique [0002] Multi-level technology has received extensive attention and research in medium-to-high voltage and high-power conversion applications. The H-bridge cascaded multilevel converter is one of the most typical representatives, and it is also a commonly used power conversion topology for high-voltage direct-mounted large-capacity battery energy storage systems. The high-voltage direct-mounted battery energy storage system has the advantages of high access efficiency, but the requirements for its operation safety protection are also more stringent. Different states such as voltage drop caused by external power grid failure, SOC balance deviation of the internal battery pack, and low SOC caus...

Claims

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Application Information

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IPC IPC(8): H02J3/32
CPCH02J3/32H02J2203/10
Inventor 张亮李丹栋水恒华侯凯杨波陶以彬何安然管益涛
Owner NANJING INST OF TECH
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