Improved adaptive droop control method for hybrid energy storage system in DC micro-grid

A technology of hybrid energy storage system and DC micro-grid, which is applied in parallel operation of DC power supplies, current collectors, energy industry, etc., can solve problems such as mismatching, supercapacitors can not respond correctly to lithium battery energy compensation, etc., to avoid compensation errors, The effect of improving reliability

Active Publication Date: 2017-08-04
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0004] The invention solves the problem that the hybrid energy storage system does not match in the cascaded control mode of the lithium battery and the supercapacitor in the DC microgrid, that is, because the DC bus voltage is in the non-operating voltage band (U dcl ≤ U dc ≤ U dch ) lead to supercapacitors not responding correctly to the energy compensation of lithium batteries, providing an improved adaptive droop control method for hybrid energy storage systems in DC microgrids

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Embodiment Construction

[0031] An improved adaptive droop control method for a hybrid energy storage system in a DC microgrid, based on a parallel structure of a lithium battery and a supercapacitor, and coordinately controlling the output of the energy storage unit through a DC / DC converter.

[0032] The lithium battery and the supercapacitor are respectively connected to the DC bus through the DC / DC converter I and the DC / DC converter II to form a parallel hybrid energy storage system.

[0033] Both the DC / DC converter I and the DC / DC converter II adopt a bidirectional Boost-Buck circuit structure.

[0034]An improved self-adaptive droop control method for a hybrid energy storage system in a DC microgrid (the method is realized based on the parallel structure hybrid energy storage system of a lithium battery and a supercapacitor in a DC microgrid according to the present invention), including the following:

[0035] (1) The bidirectional DC / DC converter I is the front-stage control, which makes the...

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Abstract

The invention provides an improved adaptive droop control method for a hybrid energy storage system in a DC micro-grid and relates to the stable running field of the DC micro-grid. The method is characterized in that, based on the improved hybrid energy storage system in the DC micro-grid, a lithium battery is connected with a DC bus through a DC/DC converter I. A super capacitor is connected with the DC bus through a DC/DC converter II. In this way, a hybrid energy storage system of a parallel connection structure is formed. According to the technical scheme of the invention, the effective energy compensation problem of the lithium battery for the super capacitor of the hybrid energy storage system in the DC micro-grid can be is effectively solved. Meanwhile, an improved adaptive droop control method is provided for the hybrid energy storage system in the DC micro-grid.

Description

technical field [0001] The invention relates to the stable operation of a DC microgrid, in particular to an improved self-adaptive droop control method for a hybrid energy storage system. Background technique [0002] As the development of new energy continues to heat up, DC microgrid has become one of the important networking methods of distributed micropower. In the island operation mode of the microgrid, maintaining the DC bus voltage stability is the prerequisite for the stable operation of the entire microgrid system. As a key link to maintain the stable operation of the micro-grid system and improve the power quality, power energy storage technology has emerged along with the development of the micro-grid. However, due to the output defects of each energy storage element, the application of a single energy storage element in a microgrid is limited. In recent years, the combined use of various energy storage elements has attracted widespread attention. [0003] Lithi...

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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 秦文萍张宋杰韩肖清王鹏王英贾燕冰孟润泉任春光王磊
Owner TAIYUAN UNIV OF TECH
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