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Direct-current micro-grid system

A technology of DC microgrid and DC bus, applied in the field of microgrid, can solve the problems of high failure probability affecting reliability of microgrid system, and achieve the effect of improving high failure probability, reducing failure probability and improving reliability.

Pending Publication Date: 2020-03-06
GUANGDONG POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a DC microgrid system, which aims to solve the problem that the high failure probability of the microgrid system affects its reliability when there are many DC conversion units in the microgrid system in the prior art

Method used

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Embodiment 1

[0024] Such as figure 1 As shown, it shows a schematic diagram of the composition of a microgrid system provided by an embodiment of the present invention, which is described in detail as follows:

[0025] A DC microgrid system 100, including a DC bus 110 and more than two DC conversion units connected to the DC bus 110, in this embodiment, figure 1 Two DC conversion units are shown in , namely a DC conversion unit 131 and a DC conversion unit 132 .

[0026] In the embodiment of the present invention, the DC conversion unit may be a power conversion device such as a DC converter, an AC converter, an inverter, or a rectifier. It is used to connect the DC bus of the microgrid system and each distributed unit of the microgrid system, and provide the function of energy conversion for each distributed unit and the DC bus.

[0027] Exemplarily, the DC conversion unit may be an energy storage bidirectional converter (Power Conversion System, PCS) connecting the DC bus and the energ...

Embodiment 2

[0034] Such as figure 2 As shown in , it shows another schematic composition diagram of a microgrid system provided by an embodiment of the present invention, which is described in detail as follows:

[0035] Such as figure 2 As shown, a DC microgrid system 200 includes a DC bus 210 and more than two DC conversion units connected to the DC bus 210. The DC conversion unit includes an energy storage bidirectional converter 231, an energy storage bidirectional converter 232 , a photovoltaic inverter 241 and an AC load inverter 251 . These DC conversion units are respectively used to connect distributed units or loads of different micro-grid systems to provide support for the normal operation of the micro-grid system.

[0036] In the embodiment of the present invention, the DC microgrid system 200 further includes an uninterruptible power supply (Uninterruptible Power Supply, UPS) 220 and an energy storage unit 230 . The input terminal of the uninterruptible power supply 220 ...

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Abstract

The invention is applicable to the technical field of micro-grids, and provides a direct-current micro-grid system. The system comprises a direct-current bus, two or more than two direct-current conversion units connected to the direct-current bus, and an uninterruptible power supply. The input end of the uninterruptible power supply is connected with an external power supply and used for receiving power supplied by the external power supply. The input end of the uninterruptible power supply is also connected with the direct-current bus and is used for receiving power supply of the direct-current bus when an external power supply is abnormal. The output end of the uninterruptible power supply is respectively connected with the two or more than two direct-current conversion units and is used for providing a working power supply for the two or more than two direct current conversion units. The failure probability of the direct-current micro-grid system can be reduced, and the reliabilityof the direct-current micro-grid system is improved.

Description

technical field [0001] The invention belongs to the technical field of micro-grids, and in particular relates to a DC micro-grid system. Background technique [0002] Micro-grid (Micro-Grid), also known as micro-grid, is a small power generation and distribution system, which can be used to realize the highly reliable supply of various energy forms to the load, and is an effective way to realize the active distribution network. The development and construction of micro-grids is conducive to promoting the transition from traditional grids to smart grids. [0003] The current DC microgrid usually includes multiple DC conversion units such as converters and inverters, which are used to connect the DC bus of the microgrid and each distributed unit. The conversion unit is a bidirectional energy storage converter, and the DC conversion unit connecting the distributed photovoltaic power source and the DC bus in the microgrid is a photovoltaic inverter. [0004] However, since the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10H02J9/06
CPCH02J1/102H02J9/06
Inventor 陈建福刘尧谭喆裴星宇陈勇陈锐涂小涛陈海森
Owner GUANGDONG POWER GRID CO LTD
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