Electric system electromechanical transient simulating method based on straight algorithm

Abstract

The invention discloses an electric system electromechanical transient simulating method based on a straight algorithm. The method includes the following steps of A, initiating parameters of an electric system; B, calculating the tide distribution of the electric system by means of the straight algorithm; C, calculating the angular acceleration, angular speed, rotor angle and frequency of the nextframe of each power generator; D, conducting frequency adjusting; E, conducting excitation regulating; F, calculating the rotating electromotive force of the power generators according to the rotor angles and frequencies of the next frames of the power generators; G, calculating the average frequency fW,n+1 of a whole network according to the frequency fi,n+1 of each power generator; H, substituting the average frequency fW,n+1 into each node, calculating the corresponding reactance and susceptance of the average frequency, and substituting the rotating electromotive force into the corresponding power generator, and finally calculating a new matrix of all nodes; I, executing the step B again. The defects of a traditional simulating method are overcome, and the method is free of iteration,high in calculating speed, high in precision and small in error and truly reflects the variation characteristics of a power grid.

Description

technical field [0001] The invention belongs to the technical field of electric power system simulation, and in particular relates to an electromechanical transient simulation method of a power system based on a direct algorithm. Background technique [0002] Electromechanical transient simulation of power system is a very important analysis method of power system. For the power system in operation, it can be predicted through simulation whether the power system will be endangered under large disturbances (such as short-circuit faults, cut-off lines, generators, loads, generator regulation excitation, impact loads, and transformer gear adjustments, etc.) Safety, whether the voltage of all buses in the system is within the allowable range, whether various components in the system (such as lines, transformers, etc.) will be overloaded, and what preventive measures should be taken in advance when overloading may occur. For the planned power system, simulation can also be used ...

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Problems solved by technology

[0004] The shortcomings of the traditional electromechanical transient simulation method are that the calculation results have large errors, low precision and slow speed, and often do not converge; and it is based on the fact that the frequencies of all generators are synchronized and consistent, which is inconsistent with the actual situation of the power grid. It is difficult to reflect the real changes of the grid

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