Multi-microgrid flexible interconnection structure based on common connection units

Abstract

A multi-microgrid flexible interconnection structure based on common connection units comprises a plurality of alternating current interface connection lines, a plurality of direct current interface connection lines and a plurality of common connection units; two ends of each alternating current interface connection line are respectively connected with a public supply network and one correspondingcommon connection unit; two ends of each direct current interface connection line are respectively connected with the common connection units; and each common connection unit is connected with one corresponding microgrid. The multi-microgrid flexible interconnection structure based on common connection units can improve the operation reliability of the multi-microgrid system by support of the frequency, the voltage and the power of the public supply network and can provide a higher control dimension and more flexible control strategy so as to obtain a better control effect, improve operationflexibility of the multi-microgrid system, reduce the electromagnetic coupling between the microgrids, improve the electric energy quality and improve the access capacity and the 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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