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Bidirectional flyback primary-side integrated battery energy storage system

A battery energy storage system, bidirectional flyback technology, applied in flexible AC transmission system, electrical components, output power conversion devices, etc., can solve the problem of inconsistent balance of battery cells, low voltage level, and large peak voltage of power switch tubes and other issues, to achieve the effect of improving energy utilization, controlling low power, and reducing conduction loss

Pending Publication Date: 2018-02-09
SOUTH CHINA UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the traditional bidirectional single-tube flyback energy storage systems are aimed at the inconsistency and balance of the battery cells, the voltage level is low, and the power switch tube is turned off at the moment of large peak voltage.

Method used

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  • Bidirectional flyback primary-side integrated battery energy storage system

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Embodiment Construction

[0021] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0022] like figure 1 , a bidirectional flyback primary-side integrated battery energy storage system, including a battery unit 100, a main power converter 200, and an auxiliary power converter 300; the battery unit 100 is connected in series by n groups of battery modules 110, and the battery module 110 is on top And under the name B 1 , B 2 ,...,B n , one end of the main power conversion converter 200 is connected in parallel with the battery unit 100, and the other end is connected to the three-phase power grid. The auxiliary power converter 300 includes a primary side integrated high frequency transformer 310, a primary side converter 320 and a secondary side A converter 330, wherein one end of the primary side converter 320 is connected in parallel with the batter...

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Abstract

The invention discloses a bidirectional flyback primary-side integrated battery energy storage system. The bidirectional flyback primary-side integrated battery energy storage system comprises a battery unit, an active power converter, an auxiliary power converter and a control circuit, wherein the battery unit is formed by connecting n groups of battery modules in series, one end of the active power converter is connected in parallel with the battery unit, the other end of the active power converter is accessed to a three-phase power grid, the auxiliary power converter comprises a primary-side integrated high-frequency transformer, a primary-side converter and a secondary-side converter, one end of the primary-side converter is connected with the battery unit, the other end of the primary-side converter is connected with the primary-side integrated high-frequency transformer, one end of the secondary-side converter is connected with the primary-side integrated high-frequency transformer, the other end of the secondary-side converter is correspondingly connected with the battery modules, and the control circuit is connected with the active power converter and the auxiliary power converter. By the bidirectional flyback primary-side integrated battery energy storage system, independent current control of the battery modules can be ensured, the inconsistency of the battery modulesconnected in series is improved, so that maximum energy utilization rate is achieved, the service lifetime of the battery modules is prolonged, and more battery modules are easy to expand and connectin series.

Description

technical field [0001] The invention relates to the field of power electronic converters, in particular to a bidirectional flyback primary-side integrated battery energy storage system. Background technique [0002] With the increasingly severe global energy security and climate change issues, ecological and environmental protection issues are becoming more and more prominent, and a new round of energy technology revolution marked by new energy and smart grids is constantly gestating and developing. In order to solve the energy fluctuation problem caused by intermittent energy generation, energy storage technology is one of the best technologies to solve the problem. Among them, battery energy storage has been widely used due to its advantages of convenient and fast installation, short construction period, and convenient expansion and transformation (modularization). [0003] The existing modular battery energy storage system usually adopts a full-power independent control ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/32H02M7/797
CPCH02J3/32H02M7/797H02M1/0067Y02E40/10
Inventor 康龙云吴璟玥冯元彬王则沣
Owner SOUTH CHINA UNIV OF TECH
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