Alternating current and direct current fusion power distribution network system and intelligent operation and maintenance method thereof

Abstract

The invention discloses an alternating current and direct current fusion power distribution network system and an intelligent operation and maintenance method thereof, and the system comprises an alternating current power distribution network employing a radial topological structure and a direct current power distribution network employing a latticed topological structure. The alternating-current power distribution network and the direct-current power distribution network perform energy exchange on a power supply side and a load side through an inverter respectively, an alternating-current power distribution line and a direct-current power distribution line are isolated from a power supply and a load through a circuit breaker, and the alternating-current power distribution network operates in a closed-loop mode through the direct-current power distribution network under the fault condition, and uninterruptible power supply is achieved. The alternating current and direct current fusion power distribution network system provided by the embodiment of the invention has the characteristics of high control speed and high remote transmission efficiency, does not need to modify and increase capacity of an original alternating current line power distribution network, fully utilizes the transmission capacity of existing equipment, quickly responds when a fault occurs, effectively combines power distribution main equipment, and improves the transmission efficiency of the power distribution network on the premise of action of a relay protection device. Normal power supply of the load is not affected, and power supply reliability can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of distribution network, and in particular relates to an AC-DC fusion distribution network system and an intelligent operation and maintenance method thereof. Background technique [0002] In the current distribution network, the AC distribution network is still the mainstream form, which is more suitable for the access of AC distributed power sources, while the access to DC distributed power sources and energy storage units requires power electronic devices to achieve energy conversion, which increases energy conversion. Times and investment costs reduce work efficiency. With the continuous increase of DC load, the research of DC distribution network has been developed rapidly. Compared with the traditional AC distribution network, the DC distribution network has the advantages of less conversion times, high efficiency, low cost, simple control structure, and no need to consider frequency. and phase and re...

AI Technical Summary

Problems solved by technology

The DC distribution network has power quality problems such as complex circuit breaker structure, high AC-DC conversion energy loss, poor controllability and flexibility, two-way interaction, poor new energy support capability, and voltage fluctuations.

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