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A distributed AC-DC hybrid system energy storage SOC control method

An AC-DC hybrid and system energy storage technology, which is applied in the direction of AC network load balancing, AC networks with the same frequency from different sources, etc., can solve problems such as microgrid failures

Active Publication Date: 2020-06-19
ZHEJIANG UNIV +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So as to solve the problem of microgrid failure caused by overcharging or overdischarging of unilateral energy storage in AC / DC hybrid microgrid

Method used

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  • A distributed AC-DC hybrid system energy storage SOC control method
  • A distributed AC-DC hybrid system energy storage SOC control method
  • A distributed AC-DC hybrid system energy storage SOC control method

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0031] The main topology of the AC-DC hybrid system is as follows: figure 1 As shown, the present invention is mainly applied in the case of an isolated island microgrid, so the AC busbar is not connected to the distribution network. The AC subnet includes AC energy storage, distributed power sources (such as photovoltaics, wind turbines, etc.) and AC loads. The DC subnet includes DC energy storage, distributed power sources (such as photovoltaics, wind turbines, etc.) and DC loads. The AC subnet and the DC subnet are connected through a bidirectional power flow controller. The power flow controller can be a single or multiple three-phase converters connected in parallel, and the power flow controller in the figure is two three-phase converters connected in parallel.

[0032] The distributed power sources in the AC-DC hybrid system all operate in the maximum power ...

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Abstract

The invention relates to a decentralized direct and alternating current hybrid system energy storage SOC control method, and belongs to the converter control technology in the field of power electronics. According to the invention, the method is applied to the direct current energy storage converter, the alternating current energy storage three-phase converter and the bidirectional power flow controller of the direct and alternating current hybrid system and is suitable for the island micro-grid topology of the energy storage battery in the direct and alternating current sub-network. Accordingto the method, the alternating current side bus frequency signal and the direct current side bus voltage signal carry the SOC information of the alternating current side energy storage and the directcurrent side energy storage respectively, the SOC management of the two sides of the energy storage is realized through the coordination control algorithm, which effectively avoids the condition thatthe direct and alternating hybrid micro-grid system crashes due to overcharging over-charging of the single-side energy storage. Meanwhile, the method can realize the control of the power flow controller by utilizing the local information, does not need communication cables, and effectively saves the communication cost.

Description

technical field [0001] The invention relates to an energy storage SOC control method of a distributed AC-DC hybrid system, which belongs to the converter control technology in the field of power electronics. Background technique [0002] With the continuous application of renewable energy, the research on renewable energy access to grid power generation technology is becoming more and more important. The research on microgrid control technology is an effective way to solve the application of distributed power supply and ensure the safe and stable operation of microgrid. Considering the current load characteristics, DC loads are far more than AC loads. However, since the traditional large power grid is still an AC network, the construction of a separate DC microgrid is relatively difficult. Therefore, research on AC / DC hybrid microgrids has begun at home and abroad. In order to ensure the stable operation of the microgrid in the island state, the microgrid usually requires ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/32H02J3/06
CPCH02J3/06H02J3/32
Inventor 于淼吕泽焱韦凌霄刘庆时韦巍宁文元刘辉
Owner ZHEJIANG UNIV
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