Fast Calculation Method of Power Grid Equivalent Parameters Based on Nonlinear Variable Substitution

Abstract

The present invention provides a power network equivalent parameter fast calculation method based on nonlinear variable substitution. The method comprises the following steps of: step 1, acquiring generator voltage values of four different active and reactive power outputs of a target power generator. step 2, substituting data of the four different active and reactive power outputs into a single-machine infinite-bus system circuit formula to obtain simultaneous nonlinear equations; step 3, performing variable substitution on the formula obtained in the step 2, and converting the nonlinear equations into linear equations; step 4, solving the linear equations obtained in the step 3 to obtain the value of an intermediate variable; and step 5, obtaining system equivalent impedance and equivalent voltage by the obtained value of the intermediate variable. According to the power network equivalent parameter fast calculation method based on the nonlinear variable substitution disclosed by the present invention, the equivalent voltage and impedance can be obtained by quartic power flow calculation, and the solving of the nonlinear equations is avoided by the nonlinear variable substitution, so that the computational complexity is greatly lowered and the computational amount is reduced; and the method has the characteristics of high calculation speed, high accuracy, easiness for application and the like.

Description

technical field [0001] The invention relates to the calculation field of equivalent parameters of a power grid, in particular to a fast calculation method for grid equivalent parameters based on nonlinear variable substitution. Background technique [0002] In the calculations involving the relationship between the generator set and the power system, such as the modeling calculation of the generator excitation system, the calculation of the phase advance depth of the generator, the analysis of the static stability limit of the generator and the calculation of the transient stability, etc., the single machine of the power system is widely used. Infinity model. In actual experiments and calculations, the parameter system equivalent voltage V of the infinite system S , System equivalent impedance R, X are the key parameters for calculation, and their accuracy will directly affect the calculation results. [0003] In engineering practice, the system equivalent voltage V S , T...

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Problems solved by technology

[0004] The invention provides a fast calculation method of grid equivalent parameters based on nonlinear variable substitution, which can solve the problem that the equivalent voltage and impedance of the system are not easy to obtain, avoid the solution of nonlinear equations through nonlinear variable substitution, and greatly reduce calculation It saves the amount of calculation, and has the characteristics of fast calculation speed, high precision and easy application.

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