A power distribution method for an AC-DC hybrid power distribution system based on DC convergence

Abstract

The invention provides an AC-DC hybrid power distribution system and a power distribution method through direct current collection. The system adds AC-DC converters at the ends of multiple AC power distribution feeders, all AC-DC converters are connected through the DC side to realize DC convergence, and the electrical interconnection of multiple AC power distribution feeders can be realized through DC convergence; the system Configure controllers at the incoming switch of each AC distribution feeder and at the DC collection point to realize electrical quantity collection, incoming line protection control, and communication with the AC / DC converter; the incoming line controller and the DC collection controller are connected via wireless way of communication. Based on the system, through the AC-DC hybrid power distribution method of DC convergence, including the current sharing control method and the emergency power supply mode switching method, the load sharing of multiple AC power distribution feeders is realized through the current sharing control method; through the emergency power supply mode switching method Realize the uninterrupted power supply of the load under any feeder fault, so as to comprehensively improve the reliability of the power distribution system.

Description

technical field [0001] The invention relates to a power distribution system and method of a power distribution network, in particular to an AC-DC hybrid power distribution system and method for realizing closed-loop operation of multiple AC power distribution feeders through direct current collection. Background technique [0002] Electricity is the basic and leading industry for national economic and social development. The safe, stable and sufficient supply of electric power is an important guarantee for the comprehensive, coordinated and sustainable development of the national economy. Now there are AC power distribution mode and DC power distribution mode. As a traditional power distribution method, the AC power distribution method is divided into a backup system and a non-backup system; the backup system is generally a closed-loop design and open-loop operation. When the external power of the power system is lost, the continuous power supply of the distribution area can...

AI Technical Summary

Problems solved by technology

The system adds AC-DC converters at the ends of multiple AC power distribution feeders, all AC-DC converters are connected through the DC side to realize DC convergence, and the electrical interconnection of multiple AC power distribution feeders can be realized through DC convergence, thereby Solve the problem that the closed-loop design and open-loop operation of the traditional power distribution method cannot realize the interconnection during operation; in order to make the system achieve the goal of continuous power supply and multi-feeder load sharing, the system is installed at the incoming switch of each AC distribution feeder and DC collection Configure the controller at each location, apply the current sharing control method to realize the load sharing of multiple AC distribution feeders; apply the emergency power supply mode switching method to realize the uninterrupted power supply of the load under any feeder failure, so as to improve the reliability of the distribution system

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