Active power distribution network structure flexibility evaluation method and system

Abstract

The invention provides an active power distribution network structure flexibility evaluation method and system. The method comprises the following steps: mining a community structure of an active power distribution network, obtaining the region division of the active power distribution network, and determining the structure position of each switch in the power distribution network; performing node power aggregation in the community structure to obtain source, convergence and transmission properties of each community, and constructing a multi-source multi-convergence network; setting a super source point and a super convergence point, converting the multi-source multi-convergence network into a single-source single-convergence network, and solving the maximum feasible flow of the network from the super source point to the super convergence point according to the maximum flow minimum cut theorem, namely the maximum exchangeable power between the communities; according to the reconstruction process of maximum power exchange between the communities, defining the flexibility measure of the active power distribution network structure, and determining the suitability measure and the agility measure.

Description

technical field [0001] The disclosure belongs to the technical field of power system operation and control, and specifically relates to a method and system for evaluating structural flexibility of an active distribution network. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] As an important part of the smart grid, the active distribution network has a flexible structural transformation capability that plays a key role in realizing the active management and control of distributed equipment in the distribution network. Through the transformation of different structural connection modes, power transmission between regions can be realized. The adjustment of the margin reduces the impact of uncertain disturbances on the distribution network. For example, when the renewable energy generation fluctuates violently and some distribution lines are...

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Problems solved by technology

However, this adjustment method ignores the limitation of the distribution network structure on the flexible resources of transmission nodes. Even if the supply of flexible resources of nodes is sufficient, if the transmission capacity of the distribution network itself is limited, or there is no required transmission path, then the supplied node Flexible resources cannot be effectively utilized, and may even cause violent fluctuations in the distribution network flow, endangering the operation safety of the distribution network

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