Modeling and Parameter Extraction of a 214 MVA Turbo-generator driven by DC Motors during Off-line Short-circuit

📄 Project Abstract

This thesis aims to extract d-axis machine parameters of a 214 MVA high-speed turbo-generator using well-established off-line techniques. MATLAB/SIMULINK tool has been utilized to model the generator and perform sudden short-circuit (SSC) tests. Because constant speed operation of the generator is vital consideration for the accuracy of SSC tests for parameter extraction, this thesis has employed an arrangement of 2 DC motors operating alongside a drive system, which is configured to couple the combined motor to drive the shaft of the generator to maintain synchronous speed throughout the test. Simulating the different drive configurations, the SSC oscillographs were captured and transformed into symmetrical envelope waveforms which were then used to extract the operational impedances and time constants of the generator. From the simulation tests, the influence of speed departures on shaft torques and current waveforms were presented and analysed. The results obtained for the variable-...