Multi-infeed AC-DC microgrid flexible interconnection system and its inter-microgrid regulation method

Abstract

The invention provides a multi-infeed type AC / DC microgrid flexible interconnected system and a regulation and control method among microgrids thereof. The multi-infeed type AC / DC microgrid flexible interconnected system comprises a plurality of AC microgrids and a DC microgrid; power electronic converters are arranged among the feeder lines of the AC microgrids; and the AC microgrids are accessed into the same DC microgrid through the power electronic converters. For a plurality of feeder lines of different AC microgrids, the AC microgrids are accessed into the same DC microgrid by using the power electronic converters, so that flexible interconnection of the multi-infeed type AC / DC microgrids is realized. Due to the controllability of the power electronic equipment, tide interaction among the AC microgrids and between the AC microgrids and the DC microgrid can be realized. A distributed power supply and a load an be accessed into the DC microgrid, so that the cost of the converter is reduced; through mutual backup and mutual supply between the AC microgrids and the DC microgrid, the power supply reliability is improved; and flexible tide control between the AC microgrids and the DC microgrid at far end can be realized by using the DC microgrid, so that the system operation is optimized.

Description

technical field [0001] The present invention relates to the fields of micro-grid technology, DC technology and power electronics technology in power systems, in particular, to a multi-infeed AC-DC micro-grid flexible interconnection system, and a multi-micro-grid control method using flexible DC in the system . Background technique [0002] In multiple AC microgrids, the feeder ends of adjacent microgrids are often interconnected through tie switches. Traditional tie switches have the following functions: [0003] 1. If a microgrid system fails, transfer the load of the faulty system to another load through the contact switch to improve the reliability of power supply; [0004] 2. Through the coordination and cooperation of multiple contact switches, network reconstruction is realized and system operation is optimized. [0005] In fact, considering factors such as the electromagnetic ring network and short-circuit current, the contact switch must be in the off state under ...

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Problems solved by technology

[0008] However, the premise of this solution is that the feeders of multiple AC microgrids are relatively close to each other. For the interconnection between multiple AC microgrids at the far end, the specific scheme design and control methods do not involve

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