Simulation of sudden three-phase short circuit of synchronous generator

Abstract

The sudden three-phase short circuit of synchronous generator is the most serious fault in power system, which may have a serious impact on the motor itself and related electrical equipment. It is of great significance to study. Under the D-P coordinate system, the mathematical model and dynamic equivalent circuit of synchronous generator are constructed. By using the powerful functions of Matlab/Simulink, a simulation model of a sudden three-phase short circuit at the generator end of the synchronous generator is constructed, and the physical quantities of the synchronous generator are simulated and studied during the short circuit. Through the comparative analysis of theory and simulation, the physical quantities of the synchronous generator have great impact and oscillation during the transient process of sudden short circuit, and finally stabilized in the state before the short circuit. The simulation results are consistent with the theoretical analysis. This method can also be used to study some dynamic processes of synchronous generators, which can provide the necessary theoretical basis for the optimal design of the motor.