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Dual-active full-bridge converter-based hybrid energy storage system and control method therefor

A technology of hybrid energy storage system and full-bridge converter, which is applied in current collectors, energy industry, and parallel operation of DC power supplies, etc. It can solve problems such as short life, frequent charging and discharging of lithium batteries, and lack of electrical isolation performance

Active Publication Date: 2017-08-18
TAIYUAN UNIV OF TECH
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  • Application Information

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Problems solved by technology

[0003] In order to solve the problems of small transformation ratio, lack of electrical isolation performance, frequent charging and discharging of lithium batteries, and short service life in the existing hybrid energy storage system, the present invention provides a hybrid energy storage system based on dual active full-bridge converters and its control method

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  • Dual-active full-bridge converter-based hybrid energy storage system and control method therefor
  • Dual-active full-bridge converter-based hybrid energy storage system and control method therefor
  • Dual-active full-bridge converter-based hybrid energy storage system and control method therefor

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Embodiment Construction

[0031] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0032] A hybrid energy storage system based on dual active full-bridge converters, such as figure 1 Shown: including supercapacitors, lithium batteries, dual active full-bridge converters, Buck / Boost bidirectional converters; the supercapacitors are connected to the DC bus through dual active full-bridge converters, the dual active full-bridge converters The converter adopts phase-shift closed-loop control; the lithium battery is connected to the supercapacitor through a Buck / Boost bidirectional converter, and the Buck / Boost bidirectional converter adopts voltage and current double closed-loop control.

[0033] Combining the above two energy storage devices forms a cascaded hybrid energy storage system.

[0034] The control method of the above-mentioned hybrid energy storage system based on dual active full-bridge converters is as follows:

[0035] Th...

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Abstract

The invention discloses a dual-active full-bridge converter-based hybrid energy storage system and a control method therefor. The hybrid energy storage system comprises a supercapacitor, a lithium battery, a dual-active full-bridge converter, a Buck / Boost bidirectional converter and a direct current bus; and two kinds of energy storage equipment form a cascading type hybrid energy storage system. The supercapacitor is connected with the direct current bus through the dual-active full-bridge converter; by adoption of phase-shifting closed-loop control and by collecting the voltage information of the direct current bus, the output power of the hybrid energy storage system can be automatically regulated so as to stabilize the voltage of the direct current bus; the lithium battery is connected with the supercapacitor through the Buck / Boost bidirectional converter; and by adoption of voltage and current dual-closed-loop control, and by collecting the voltage of the supercapacitor, automatic charging and discharging of the lithium battery can be controlled, so that the voltage of the supercapacitor can be maintained within a working voltage range, so as to perform indirect compensation to power fluctuation of a direct current microgrid, reduce action frequency of the lithium battery, and effectively prolong the service life.

Description

technical field [0001] The invention relates to the field of DC microgrid hybrid energy storage, in particular to a hybrid energy storage system based on dual active full-bridge converters and a control method thereof. Background technique [0002] With the severe aggravation of environmental pollution and the increasing demand for new energy sources, the development of DC microgrid technology has received more and more attention. Microgrid is a power generation and distribution system that organically integrates distributed power sources, loads, energy storage devices, power electronic converters, and monitoring and protection devices. In the DC microgrid, due to the intermittent and random nature of the distributed power output power, the energy storage system has become an important part of the DC microgrid, which is used to maintain the internal power balance of the DC microgrid and stabilize the DC bus voltage. The hybrid energy storage system takes advantage of the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10H02J7/34
CPCY02P80/14H02J1/10H02J7/345
Inventor 贾燕冰田晋杰韩肖清任春光蔺晓强张佰富米芝昌
Owner TAIYUAN UNIV OF TECH
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