Layered structure of power distribution network

Abstract

The invention discloses a layered structure of a power distribution network. The layered structure is sequentially divided into a first layer, a second layer, a third layer and a fourth layer from a high layer to a low layer, a step-down transformer substation is located at the first level and is a 110kV or 35kV step-down 10kV transformer substation; a medium-voltage backbone network is located at the second level and is composed of a plurality of 10kV switching stations; a medium-voltage secondary dry network is located at the third level and is composed of a plurality of 10kV ring network stations; and a user power supply point is located at the fourth level. According to the layered structure of the power distribution network, the 10kV switching station of the second level has a fault isolation function and a bus spare power automatic switching function, the second level is endowed with minute-level power supply recovery capacity under the n-1 fault condition, network faults occurring below the second level cannot spread to the position above the second level, the power supply interruption frequency of a user is remarkably reduced, and the power supply efficiency of the user is improved. And the number of affected power failure users under the condition of large disasters or faults is greatly reduced.

Description

technical field [0001] The invention relates to a layered structure of a distribution network. Background technique [0002] At present, the dual-circuit power supply mode is generally adopted for urban power users. The power supply path not only comes from different upper-level nodes, but also presents diversified risk dispersion characteristics when traced back to the top. more. Moreover, the 10kV switch station generally does not have the function of fault isolation. The network fault below the 10kV switch station will spread to the 10kV switch station and above, and the user's power supply will be interrupted frequently. Moreover, the 10kV switch station generally does not have the function of busbar self-switching, and the 10kV switch station The minute-level power supply recovery capability cannot be provided in the case of n-1 faults, and the implementation cost is high if standard distribution automation (DA) technology is used. SUMMARY OF THE INVENTION [0003] ...

AI Technical Summary

Problems solved by technology

Moreover, 10kV switch stations generally do not have fault isolation functions. Network faults below 10kV switch stations will spread to above 10kV switch stations, and the frequency of power supply interruptions for users is high; In case of n-1 faults, it cannot provide minute-level power supply recovery capability, and the implementation cost is high if standard distribution automation (DA) technology is adopted

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