B.Sc. THESIS

 

N. Dizdarevic, Transient Stability of Synchronous Generator – A Computer Representation, B.Sc. Thesis, University of Zagreb, Faculty of Electrical Engineering and Computing, Dept. Power Systems, Zagreb, Croatia, December 1990

 

Description: Within B.Sc. thesis the problem of transient stability of single machine - infinite bus (SMIB) test system is addressed and a computer program aimed for a time-domain simulation with graphical interpretation of the results is developed. The impact of the three-phase short circuit of a synchronous generator represented with the current model of 7th order was analysed with respect to the models of different excitation systems, power system stabilisers and speed governor - turbine systems according to relevant classical and modern references. The main goal of this work comes up at the point of explanation of appearance and general development of transient stability problem as the analysis of mentioned mathematical generator model in details. The analysis identifies significant parameters and regulation actions that mostly influence critical fault clearing times and swing curves. The SMIB model of a test system has been extended to include transmission lines switching sequences (in radial and parallel mode of connection) after three-phase short circuit. Synchronous generator electrical air-gap torque is analysed for the sake of preserving stability by applying automatic fast re-closing technique of the lines after being switched off by means of protective devices. The final result appears in the form of continuous supply of the consumers via temporary fault elimination. A number of papers are published.