SIMULATION OF A SYNCHRONOUS GENERATOR CONNECTED VIA A DELTA-STAR TRANSFORMER BY TIME-STEPPING FINITE ELEMENT METHOD

Using time-stepping finite element method a simulation program for transient operation of a three-phase generator connected to infinite bus system and power load via a transformer with delta-star wiring is presented, in which the core saturation, the variation of rotation speed and the adjustment of AVR are taken account into generator model, the electromagnetic torque is calculated by Maxwell stress tensor method. In the calculation by means of changing the corresponding parameters in simulation program the processes of switching-on and switching-off of the circuit breakers in different transmission lines are simulated, so the digital finite element simulation for the generator operation under three phase symmetrical disturbances can be conveniently carried out. The results of calculation examples show that this program is correct.