Distribution network risk assessment method fusing main network fault analysis

Abstract

The invention discloses a distribution network risk assessment method fusing main network fault analysis, and relates to the field of electric power operation and maintenance. Traditional power distribution network risk assessment does not consider the influence of a main network on a power distribution network, risk assessment is carried out only from the perspective of the power distribution network, and assessment is not comprehensive. The method comprises the following steps: analyzing a main distribution network joint network; associating a feeder line outlet switch of a distribution network with a low-voltage load of a main network; performing topology analysis, state estimation and load flow calculation; establishing a main network spare power automatic switching model according tothe main network frame; analyzing an anticipated fault of the main network; deriving a main network fault consequence to a distribution network fault consequence; mapping the power-losing low-voltageload of the main network to a distribution network feeder line by utilizing a result of main and distribution network joint network analysis, and then finding out power-losing distribution network distribution transform caused by a main network fault; fusing the main network into an original risk assessment algorithm, considering the influence of the main network on the distribution network, and performing cooperative risk assessment calculation by combining the main network and the distribution network. An evaluation result is more comprehensive, and the evaluation accuracy is effectively improved.

Description

technical field [0001] The invention relates to the field of power operation and maintenance, in particular to a distribution network risk assessment method integrated with main network fault analysis. Background technique [0002] The distribution network refers to the power network that receives electric energy from the transmission network or regional power plants, and distributes it locally through power distribution facilities or distributes it to various users step by step according to voltage. The distribution network often has the coexistence of radial network and ring network, with different voltage levels, various types of loads, and different degrees of importance. The power supply mode based on closed-loop design and open-loop operation has become a more prominent feature of the distribution network; the hand-in-hand and multi-connection wiring methods make the load transfer of the distribution network more complicated, and the requirements of users for uninterru...

AI Technical Summary

Problems solved by technology

[0003] The traditional distribution network risk assessment algorithm does not fully consider the impact of the main network on the distribution network, and only conducts risk assessment from the perspective of the distribution network, and the assessment results are not comprehensive

And at this stage, due to the lack of backup and automatic switching simulation models and main network models, the calculation results of distribution network N-1 cannot truly reflect the actual situation.

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