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Distributed direct-current micro-grid composite energy storage control method

A DC microgrid and composite energy storage technology, applied in the field of electrical engineering, can solve the problems of single control object, high energy storage requirements, poor control effect, etc., to achieve the effect of balanced output, prolonged service life, and improved voltage level

Active Publication Date: 2017-12-26
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

At present, there are certain problems in the decentralized and centralized control commonly used in DC microgrids, and the control object is mostly a single energy storage, the control effect is poor, and the requirements for energy storage are high.

Method used

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  • Distributed direct-current micro-grid composite energy storage control method
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Embodiment Construction

[0050] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0051] figure 1 It is a schematic diagram of the system structure of a 400V DC microgrid system composed of 4 PVs and 4 HESSs; the system includes a physical layer and a network layer; the physical layer includes PVs, HESS and loads; the network layer includes communication links for completing Information exchange between HESSs. Among them, the HESS structure diagram is as follows figure 2 Schematically, including supercapacitors and batteries and respective bidirectional DCDC converters. A distributed DC microgrid composite energy storage control method provided by the embodiment will be described in detail below in combination with the system.

[0052] For the above-mentioned system, the control objective of usin...

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Abstract

The invention discloses a distributed direct-current micro-grid composite energy storage control method. The method comprises super capacitor control and storage battery control. The super capacitor control comprises average voltage control and end voltage consistency control. The average voltage control can make an average bus voltage at a direct current composite energy storage outlet reach a rated voltage so as to enhance an overall voltage level of a system. The end voltage consistency control can maintain end voltages of a super capacitor to be the same and realize equalization output. The storage battery control comprises super capacitor end voltage control and state-of-charge (SoC) control. The super capacitor end voltage control can maintain a super capacitor end voltage level. The SoC control makes output power of a storage battery distributed according to SoC and a single storage battery is prevented from being over-charged and over-discharged. By using the method of the invention, a distributed control problem of composite energy storage is solved. And the method is suitable for a direct-current micro-grid system which is connected in parallel to a multi-composite energy storage system (HESS).

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and more specifically relates to a method for controlling a composite energy storage of a distributed DC microgrid. Background technique [0002] Facing the increasingly complex stability problems of traditional large power grids and the excessive consumption of fossil energy, the micro-grid technology developed on the basis of distributed power generation has attracted widespread attention. Compared with the AC microgrid, the DC microgrid has no reactive power, frequency and phase problems, and can also avoid distortion and harmonics caused by AC-DC conversion, improve power quality, and effectively reduce the number of converters and reduce economic costs. . As an important part of DC microgrid, energy storage can compensate the unbalanced power caused by renewable energy and load changes in the system, stabilize voltage fluctuations, improve power quality, and maintain the stab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/00H02J7/34
CPCH02J1/00H02J7/345
Inventor 陈霞周建宇石梦璇孙海顺
Owner HUAZHONG UNIV OF SCI & TECH
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