An Electromechanical Transient Simulation Method of Power System Based on Direct Algorithm

Abstract

The invention discloses an electromechanical transient simulation method of a power system based on a direct algorithm, comprising the following steps: A. initializing power system parameters; B. calculating the power flow distribution of the power system by using a direct algorithm; Angular velocity, rotor angle, frequency; D for frequency adjustment; E for excitation adjustment; F to calculate the generator rotation electromotive force according to the rotor angle and frequency of the next frame of the generator; G according to the frequency f of each generator i,n+1 , calculate the average frequency f of the whole network W,n+1 ; H will average the frequency f W,n+1 Bring in each node and calculate its corresponding reactance and susceptance, and substitute the rotating electromotive force into the corresponding generator, and finally calculate the new matrix of all nodes; I re-enter step B. The invention overcomes the defects of the traditional simulation method, has no iteration, fast calculation speed, high precision and small error, and truly reflects the changing characteristics of the 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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