High-voltage asynchronous flexible interconnection device of common direct-current bus

Abstract

The invention discloses a high-voltage asynchronous flexible interconnection device of a common direct-current bus. The high-voltage asynchronous flexible interconnection device comprises a first phase-shifting transformer, a second phase-shifting transformer and a converter group of the common direct-current bus; three-phase primary windings of the first phase-shifting transformer and the second phase-shifting transformer are respectively used for being butted with different high-voltage distribution lines, and each three-phase secondary winding of the first phase-shifting transformer is respectively and correspondingly connected with an input port of the converter group in series; each output port of the converter group is respectively and correspondingly connected in series with a three-phase secondary winding of the second phase-shifting transformer; and in the converter group, a plurality of converters are connected in parallel between the first phase-shifting transformer and the second phase-shifting transformer in a common direct-current bus manner, so that flexible interconnection among different high-voltage distribution lines is formed. According to the invention, any two sections of high-voltage distribution lines are flexibly interconnected to form a net-shaped connection network, so that any scheduling and mutual support of electric energy are realized.

Description

technical field [0001] The invention belongs to the field of new energy and smart grids, and more specifically relates to a high-voltage asynchronous flexible interconnection device with a common DC bus. Background technique [0002] At present, there are many existing patent applications for multi-port flexible switches for AC high-voltage power distribution in power distribution networks and industrial enterprises, but whether it is the H-bridge unit series high-voltage High-voltage multi-port flexible switches use low-voltage components or modules connected in series to improve the ability of the converter to output high voltage, so that the entire power electronic converter part is charged with high voltage, which has great impact on the insulation structure, safety protection and maintenance of the device. There are very high requirements, and the heat dissipation method is also restricted; there are also individual patent applications for the common busbar to realize t...

AI Technical Summary

Problems solved by technology

[0002] At present, there are many existing patent applications for multi-port flexible switches for AC high-voltage power distribution in power distribution networks and industrial enterprises, but whether it is the H-bridge unit series high-voltage High-voltage multi-port flexible switches use low-voltage components or modules connected in series to improve the ability of the converter to output high voltage, so that the entire power electronic converter part is charged with high voltage, which has great impact on the insulation structure, safety protection and maintenance of the device. There are very high requirements, and the heat dissipation method is also restricted; there are also individual patent applications for the common busbar to realize the flexible interconnection of high-voltage power distribution, but the converter and the high-voltage busbar are realized through a simple voltage transformation, which will bring other problems , First, the high harmonic content is high, and the power factor is also low. Second, the modular structure, the integration level is low, the DC capacitor usage is large, and the cost is high. The third is the complex cooling method.

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