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Method of achieving in-phase SOC balance for MMC battery energy storage system by increasing and decreasing modules

A technology of battery energy storage system and battery management system, which is applied to battery circuit devices, secondary battery charging/discharging, secondary battery repair/maintenance, etc., to achieve fast response speed and eliminate adverse consequences

Inactive Publication Date: 2014-03-19
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the SOC of each power module is inconsistent, how to achieve SOC balance control between different power modules in a phase through additional methods has not been reported in the literature.

Method used

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  • Method of achieving in-phase SOC balance for MMC battery energy storage system by increasing and decreasing modules
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  • Method of achieving in-phase SOC balance for MMC battery energy storage system by increasing and decreasing modules

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Embodiment Construction

[0030] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0031] On the basis of the technical solutions provided in the summary of the invention, a detailed description of the embodiments of the present invention is given below:

[0032] 1. A single-phase 16 power module MMC battery energy storage system topology:

[0033] like figure 1 The circuit topology of a single power module is shown, which consists of energy storage batteries, capacitors, and a half-bridge inverter; figure 2 The circuit topology of a single-phase 16-power module cascaded MMC ...

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Abstract

The invention provides a method of achieving in-phase SOC balance for an MMC battery energy storage system by increasing and decreasing modules. The method comprises the steps of first collecting SOC information and charge and discharge states of energy storage batteries, that is, collecting, through a battery management system, SOC information of energy storage batteries of different power modules and charge and discharge states of the system at the time; and then adjusting working states of the power modules in one phase, that is, adjusting a mandatory access or bypass time period duty ratio of corresponding power modules according to different states of a PCS system and sizes of SOCs of the energy storage batteries of the power modules in the phase. Taking the MMC battery energy storage system as an object, the method provided by the invention controls the mandatory access or bypass time of the power modules in one phase to achieve the purpose of SOC balance of energy storage batteries in the phase.

Description

technical field [0001] The invention relates to the field of battery energy storage, in particular to a method for adding and subtracting modules to realize SOC balance in a phase of an MMC battery energy storage system, which is applied to large-scale battery energy storage occasions such as energy storage power stations and wind storage systems. Background technique [0002] The battery energy storage system mainly realizes the storage and release of energy, and its main components include energy storage batteries and energy storage conversion systems (Power Conversion System-PCS). The PCS mainly implements functions such as charge and discharge control and power regulation. The battery energy storage and conversion system based on the MMC structure reduces the voltage stress on the power electronic devices due to the introduction of multi-level technology; and because of the structural advantages, each battery pack can be controlled relatively independently, so that it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/44
CPCY02E60/10
Inventor 凌志斌王艺翰曹阳马勤冬李硕
Owner SHANGHAI JIAO TONG UNIV
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