Piecewise linearization-based power system optimal power flow calculation method

Abstract

The invention relates to a piecewise linearization-based power system optimal power flow calculation method, and belongs to the field of power system operation optimization. The method comprises the following steps: firstly, establishing a mixed integer nonlinear programming model of optimal power flow composed of an target function and constraint conditions; then carrying out piecewise linearization processing on a nonlinear part in the mixed integer nonlinear programming model, wherein the piecewise linearization processing includes secondary power generation cost equation constraints, capacitor adjustment constraints and tide equation constraints; sorting to obtain an optimal power flow model after piecewise linearization; and solving the optimal power flow model after piecewise linearization to obtain an optimal solution of the model, including optimal set reference values of all generators, continuous reactive equipment, capacitors and transformers, and realizing the optimal powerflow of the power system. The power flow model of the power system is accurately approximated through a piecewise linearization method, efficient and reliable solving of the optimal power flow problem is guaranteed, and then safe and efficient operation of the power system is achieved.

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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