This Thesis outlines a means of Frequency Response Testing a Synchronous Machine by modulating a Pseudo Random Binary sequence with the field current controllers phase angle delay on the rotor of a synchronous machine. The machine will be on-line and possibly under load.
Using cross-correlation and Fast Fourier Transform (FFT) techniques of the rotor input and stator output windings, a frequency response model of the machine should be able to be obtained.
This Thesis includes the design and construction of a fully controlled 3-phase bridge rectifier connected to the rotor of a synchronous machine. The addition of a circuit to modulate a pseudo random sequence with the rotor excitation current of the machine was completed and perfected.
Pseudo random binary sequence behavior and characteristics are explored in depth. Construction and frequency response analysis by FFT is covered correspondingly. Frequency response tests are conducted on the synchronous machine system by conventional means. Results obtained conformed to how the system should act when compared with previous data for the machine.