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In-phase SOC (state of charge) balancing method of MMC battery energy storage system

A technology of battery energy storage system and balancing method, applied in battery circuit devices, secondary battery charging/discharging, secondary battery repair/maintenance, etc., to achieve the effect of eliminating adverse consequences and fast response speed

Active Publication Date: 2014-01-29
湖南湘源微能电力科技有限公司
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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 realize the SOC balance control between different power modules in the phase through carrier phase shift modulation has not been reported in the literature.

Method used

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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] Such as 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 MM...

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Abstract

The invention provides an in-phase SOC (state of charge) balancing method of an MMC battery energy storage system. The energy storage system adopts carrier phase-shift modulation. The method includes collecting SOC information and charging and discharging states of energy storage batteries, namely collecting the SOC information of each power module energy storage battery and the charging and discharging states of the system at the moment through a battery management system; adjusting carrier amplitude, namely adjusting forward and backward access time ratio of corresponding power modules according to different states of a PCS system and the size of SOC of each power module energy storage battery in phase. The objective of in-phase energy storage battery SOC power balancing is realized by taking the MMC battery energy storage system as an object, collecting battery SOC and controlling carrier amplitude.

Description

technical field [0001] The invention relates to the field of battery energy storage, and is applied to large-scale battery energy storage occasions such as energy storage power stations and wind storage systems. Specifically, it relates to an SOC equalization method in phase shift modulation of an MMC battery energy storage system. 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 easy to realize...

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 湖南湘源微能电力科技有限公司
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