Direct-current power distribution system of fully-flexible structure

Abstract

The invention discloses a direct-current power distribution system of a fully-flexible structure. A voltage converter of the direct-current power distribution system is a solid-state transformer and comprises an alternating current/direct current solid-state transformer, a direct current/direct current solid-state transformer and a direct current/direct current/alternating-direct current solid-state transformer, an alternating current side of the alternating current/direct current solid-state transformer is connected with different alternating current power distribution lines or an alternating-current distributed-type power source while a direct current side of the same is connected with a direct current power distribution line, a low voltage side of the direct current/direct current solid-state transformer is connected with a direct-current distributed-type power source while a high voltage side of the same is connected with the direct current power distribution line, a high voltage direct current side of the direct current/direct current/alternating current solid-state transformer is connected with the direct current power distribution line while an alternating current side of the same is connected with an alternating current power consumption line to provide alternating current power, and a low voltage direct current side of the direct current/direct current/alternating current solid-state transformer is connected with a direct current power consumption line to provide direct current power. By the direct-current power distribution system, flexible conversion of alternating current and direct current for constructing the direct-current power distribution system is realized, convenience can be brought to connection-in of the distributed-type power source and stored energy in a direct-current manner, high quality alternating and direct current power is provided, and direct-current power distribution networks with various structures can be formed flexibly.

Description

technical field [0001] The invention relates to flexible AC power transmission and distribution technology, in particular to a DC power distribution system with a fully flexible structure. Background technique [0002] Due to the intermittent and random characteristics of wind power, solar power and other green renewable energy power generation, traditional power equipment, grid structure and operation technology are increasingly unable to accept more and more distributed renewable power sources. The way of accessing the distribution network is more suitable for the high penetration rate access of these distributed renewable energy sources; the traditional distribution network is an AC grid and does not have the function of DC power consumption, and the method currently used by a large number of electronic DC loads is generally in the power consumption The method of installing power electronic rectifier power supplies on the load side converts the AC power provided by the di...

AI Technical Summary

Problems solved by technology

[0004] At present, when constructing DC distribution network in the existing AC distribution network, most of the references are made to High Voltage Direct Current (HVDC) or light DC transmission system mode HVDC Light. In view of the lack of mature system structure and construction of DC distribution network In addition, there are great differences between HVDC and DC distribution network applications, such as: different application occasions, different topology structures, different control requirements and complexity, different relay protection control strategies and energy management methods, etc. , so it is necessary to provide a technical solution to construct the unique system structure of the AC-DC hybrid power distribution system suitable for the development of the future distribution network

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