Parameter Identification Of Synchronous Generator Based On The Results Of Time Stepping Finite Element Model

The parameters of synchronous generator used in power system are often obtained by the empirical formula. The simulation results calculated by these parameters have a large difference from the results of testing. Some people proposed that the accuracy parameters could be obtained by parameter identification base on experiment results. However, the large disturbance testing of large synchronous generator is hard to implement. Therefore, this paper proposes that the parameters are identified based on the results calculated by Time-Stepping Finite Element Model (T-S FEM). With a 300 MW turbine generator as an example, the steady-state parameters (x(d), x(q)), transient parameters (x(d)', x(q)', T-d0', T-q0') and sub-transient parameters (x(d)'', x(q)'' T-d0 '' T-q0 '') are identified by the least square method, and compared with the results by the empirical formula. The parameters are identified in different power angle and the influences factor on different parameters are compared and analyzed. Since the rotor slot wedge has several materials to choose from, the parameters of synchronous generator with slot wedge made from aluminum and stainless steel are identified respectively. The result shows that the parameters have a great difference in different power angle. The sub-transient time constants of synchronous generator with the rotor slot wedge made from stainless steel are smaller than that made from aluminum.