Multi-microgrid flexible interconnection structure based on common connection unit

Abstract

A multi-microgrid flexible interconnection structure based on a common connection unit, comprising: several AC interface connection lines, several DC interface connection lines, and several public connection units, wherein: the two ends of the AC interface connection lines are respectively connected with the public power grid and the corresponding public The connection units are connected, the two ends of the DC interface connection line are respectively connected with the common connection unit, and the common connection units are respectively connected with their corresponding microgrids. The present invention can improve the operation of the multi-microgrid system through the frequency, voltage and power support of the public grid Reliability, which can provide higher control dimensions and more variable control strategies, so as to obtain better control effects, improve the operational flexibility of multi-microgrid systems, reduce electromagnetic coupling between microgrids, and improve power quality. , improve the access capability and utilization rate of distributed new energy.

Description

technical field [0001] The invention relates to a technology in the field of power grids, in particular to a multi-micro-grid flexible interconnection structure based on a common connection unit for fast and flexible connection of multiple sub-micro-grids. Background technique [0002] The environmental problems caused by fossil fuels have drawn worldwide attention to renewable energy such as wind power and solar power. In addition, the rapid development of related technologies such as power electronic devices and microgrids has also promoted the widespread application of renewable energy. In order to realize the coordinated control of distributed power and provide clean and efficient power to the grid, microgrid has become an effective way to accommodate multiple types of distributed power. Different from the traditional distribution network, the microgrid has two modes of operation, grid-connected and isolated, and has good operational flexibility and reliability. However...

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Problems solved by technology

[0004] The present invention aims at the defects that the existing networking device cannot simultaneously realize the direct interconnection of microgrids of different voltage levels, the hybrid interconnection of AC microgrids and DC microgrids, the asynchronous interconnection of multiple microgrids, and the lack of coordination control devices, and proposes a public-based The multi-microgrid flexible interconnection structure of the connection unit can improve the operation reliability of the multi-microgrid system through the frequency, voltage and power support of the public grid, and can provide higher control dimensions and more variable control strategies, thereby obtaining more Good control effect improves the operating flexibility of the multi-microgrid system, reduces the electromagnetic coupling between microgrids, improves power quality, and improves the access capability and utilization rate of distributed new energy

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