Decentralized direct and alternating current hybrid system energy storage SOC control method

A technology of AC-DC hybrid and control method, which is applied in the field of distributed AC-DC hybrid system energy storage SOC control, and can solve problems such as microgrid failures
CN108565880AActive Publication Date: 2018-09-21ZHEJIANG UNIV +3
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG UNIV
Publication Date
2018-09-21

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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.
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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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