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In-phase SOC (state of charge) balance control method applying to H bridge cascaded battery energy storage system

A technology of battery energy storage system and balance control, which is applied in battery circuit devices, secondary battery charging/discharging, secondary battery repair/maintenance, etc. It can solve the problems of no battery balance control strategy and achieve good adjustment characteristics.

Active Publication Date: 2013-09-11
SOUTHERN POWER GRID PEAK LOAD & FREQUENCY REGULATION GENERATING CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no clear battery balancing control strategy for high-power battery energy storage systems

Method used

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  • In-phase SOC (state of charge) balance control method applying to H bridge cascaded battery energy storage system
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  • In-phase SOC (state of charge) balance control method applying to H bridge cascaded battery energy storage system

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Embodiment Construction

[0035] 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.

[0036] 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:

[0037] 1. N H-bridge cascaded PCS system topology

[0038] figure 1 It is a single H-bridge power unit circuit topology, mainly composed of energy storage batteries, absorbing capacitors, and a full-bridge inverter. figure 2 It is the circuit topology of N H-bridge cascaded PCS system, which is divided into ABC three-phase....

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Abstract

The invention provides an in-phase SOC (state of charge) balance control method applying to an H bridge cascaded battery energy storage system. The method includes collecting SOC information of energy storage batteries and charging and discharging states, namely collecting the SOC information of each H bridge power unit energy storage battery and the charging and discharging states of the system at the moment; adjusting amplitude of a carrier triangular plate, namely adjusting the amplitude of the carrier triangular plate respectively according to different states of a PCS (power conversion system). By taking a high-capacity battery energy storage H bridge cascaded power conversion system as an object, the objective of controlling a modulation ratio to realize in-phase energy storage battery SOC power balance is achieved by collecting states of charge of the batteries. By the in-phase SOC balance control method, influences on phase output voltage of changes of the stages of charge of in-phase batteries of the energy storage power conversion system can be eliminated, good adjusting characteristics especially for unstable voltage of a battery platform are realized.

Description

technical field [0001] The invention relates to a battery energy storage system, in particular to realizing power balance control of an energy storage battery by controlling a modulation strategy of an energy storage converter. Background technique [0002] The battery energy storage system mainly realizes the storage and release of energy, and its main components include the battery energy storage carrier and the energy storage power conversion system (Power Conversion System-PCS) composed of power electronic devices. The PCS mainly implements functions such as charge and discharge control and power regulation. [0003] There are various topological structures of high-power battery energy storage systems, such as DC / AC single-stage structure, DC / DC+DC / AC dual-stage structure, DC / AC cascaded multi-level structure, and so on. The MW-level battery energy storage system is directly connected to the medium-voltage power grid. The output voltage of the DC / AC single-stage structu...

Claims

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Application Information

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IPC IPC(8): H02J7/00H01M10/44H02M7/00
CPCY02E60/10
Inventor 陈满凌志斌郭海峰张百华李永兴李勇琦周劲松晁刚
Owner SOUTHERN POWER GRID PEAK LOAD & FREQUENCY REGULATION GENERATING CO LTD
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