An Accurate Linearization Method for Transformer Model in Optimal Power Flow of Active Distribution Network

Abstract

The present disclosure provides a method and a device for controlling an active distribution network, relating to the field of power system operation and control technology. The method includes: creating a power loss objective function; determining first power flow equations; obtaining second power flow equations by performing linearization on the first power flow equations; determining a sub-scale adjustment model of a transformer; obtaining a linearized model of the transformer by performing linearization on the sub-scale adjustment model; obtaining control parameters by solving the power loss objective function according to the second power flow equations, the linearized model of the transformer, an operation constraint of the continuous reactive power compensator, an operation constraint of the grouping switching capacitor, an operation constraint of the distributed generator and a safety operation constraint in the active distribution network, such that the active distribution network is controlled by the obtained parameters to minimize power loss.

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 (Distributed Generation, 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 distri...

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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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