A Calculation Method of Optimal Power Flow in Power System Based on Piecewise Linearization

Abstract

The invention relates to a method for calculating an optimal power flow of a power system based on segmental linearization, and belongs to the field of power system operation optimization. This method first establishes a mixed integer nonlinear programming model of the optimal power flow composed of objective functions and constraints; then performs piecewise linearization on the nonlinear part of the mixed integer nonlinear programming model, including the secondary power generation cost equation constraints, capacitor adjustment constraints, and power flow equation constraints; the optimal power flow model after piecewise linearization is sorted out; the optimal power flow model after piecewise linearization is solved to obtain the optimal solution of the model, including all generators, continuous The optimal setting reference value of power equipment, capacitors and transformers can realize the optimal power flow of the power system. The present invention accurately approximates the power system power flow model through a segmented linearization method to ensure efficient and reliable solution of the optimal power flow problem, thereby realizing safe and efficient operation of the power system.

Description

technical field [0001] The invention relates to a method for calculating an optimal power flow of a power system based on segmental linearization, and belongs to the technical field of power system operation optimization. Background technique [0002] The optimal power flow of the power system is based on the premise of reliable power supply to users, reasonably allocates power generation and load, and regulates various controllable equipment, so that the operating cost or fuel cost of the power system is the lowest. The constraints are the active power balance and reactive power of the power grid. balance, and the security constraints of grid operation, etc. However, the optimal power flow problem is difficult to calculate reliably and efficiently because of its nonlinearity and integer variables. The traditional linearization method makes a global linear approximation to the nonlinear part of the optimal power flow problem. Although the optimal power flow problem can be ef...

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Problems solved by technology

However, the optimal power flow problem is difficult to calculate reliably and efficiently because of its nonlinearity and integer variables. The traditional linearization method makes a global linear approximation to the nonlinear part of the optimal power flow problem. Although the optimal power flow problem can be effectively calculated, there are The defect of poor calculation accuracy will lead to voltage safety problems in the power system, which will affect the normal and safe operation of the power system

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