Distributed power flow optimization method based on dividing large network into small network

Abstract

The invention relates to a distributed power flow optimization method based on splitting a large network into a small network, which comprises the following steps of: selecting any line as a broken line on an annular topological structure in a power system, splitting a network topological structure of the power system into a plurality of radiation type networks, and generating breakpoints at the broken line positions; convex relaxation is carried out on the mathematical optimization model of the radiation type network power system, and a distributed optimization model is constructed in combination with coupling constraints between breakpoints on each radiation type network; the distributed optimization model is solved, when the convergence condition is met, the algorithm is terminated, the iteration process is ended, and the obtained variable value is the optimal solution. According to the method, the slack domain is gradually reduced through a distributed optimization model of dividing a large net into a small net and a solving method. According to the method, iteration is simpler, optimization solution can be rapidly achieved, meanwhile, good convergence performance is achieved, and the feasibility of understanding is guaranteed; meanwhile, the distributed architecture ensures privacy in the system, and the accuracy and solving efficiency of convex relaxation are ensured by splitting a large net into a small net.

Description

technical field [0001] The invention relates to a distributed power flow optimization method based on the dismantling of a large network and a small network. Applicable to the field of power system. Background technique [0002] At present, with the continuous development of social economy and technology, the global power load is increasing year by year, and the power grid is becoming larger and larger. In order to ensure the reliability of power transmission, large-scale power grids often present a partial ring topology. At the same time, with the access of new energy power generation systems such as solar energy and wind power, the traditional power grid presents a distributed topology according to the characteristics of regions and loads. [0003] In order to improve energy utilization, better dispatch power distribution, and achieve economical and stable operation of the system, a series of optimization methods are applied to the power system. Power system optimizatio...

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Problems solved by technology

[0006] In power system optimization, the second-order cone relaxation is widely used due to its fast calculation, but due to the existence of slack variables, the node phase angle information is lost; the positive semi-definite relaxation is often used because it contains complete variables, but its calculation efficiency is relatively low. Low

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