Precise linearization method of transformer model in active power distribution network optimal power flow

Abstract

The invention provides a precise linearization method of a transformer model in active power distribution network optimal power flow, and belongs to the technical field of electric power system operation and control. The method includes the steps of: building of a target function of the active power distribution network optimal power flow; building of an active power distribution network three-phase branch form power flow equation; second-order cone loosening of the power flow equation; precise linearization of the transformer model; operation constraints of control variables; and mixed integer second-order cone programming solution of the active power distribution network optimal power flow. Through the precise linearization method, a nonlinear transformer model is converted into a linear model, and precise and efficient solution of the optimal power flow problem including the transformer can be realized.

Description

technical field [0001] The invention belongs to the technical field of power system operation and control, and relates to an accurate linearization method for a transformer model in the optimal power flow of an active distribution network. The transformer model is considered in the power flow equation of the optimal power flow problem of an active distribution network, and the transformer model The exact linearization method converts the optimal power flow problem into a mixed-integer second-order cone programming problem for solution. Background technique [0002] The development of distributed generation (DistributedGeneration, DG) can optimize the energy structure, promote energy conservation and emission reduction, and achieve sustainable economic development. In recent years, the penetration rate of distributed power generation, energy storage devices and reactive power compensation devices in the distribution network has gradually increased, and the traditional distrib...

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Problems solved by technology

Introducing the gear control variable of the adjustable transformer in the optimal power flow problem requires the establishment of a transformer model in the optimal power flow model, and the nonlinear term in the model due to the transformation ratio of the transformer will lead to the optimal power flow problem of the active distribution network non-convex, difficult to solve

Up to now, there is still a lack of an accurate and efficient solution method that can consider the transformer model in the optimal power flow problem of active distribution network

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