Verification Methodology for Simulation Models of the Synchronous Generator on Transients Analysis

During transients, which occurs in the electric network, large currents can flow, and large electromagnetic torques can be developed in electric generators. Accurate calculation of currents and magnetic field during transients is an important element due to the optimal design of generator and of the network parts, as well as mechanical parts of the machine and other torque transmission parts. This paper describes the modeling of an sudden three - phase short circuits using FEM, and using the equivalent circuit method. The model for simulations using finite element method (FEM) was developed in the MagNet software package, and for the equivalent circuit method in the Matlab / Simulink software package. The results obtained after the simulation of a sudden three-phase fault on the generator are presented: three-phase voltages, three-phase currents, machine speed, excitation voltage and mechanical power. Finally, the results of these two calculation methods are compared, and recommendations for the application of different modeling methods are presented.