Bollinger, K. E.2024-04-222024-04-221977-11November 1https://hdl.handle.net/10388/15628This thesis describes the design and implementation of a minicomputer based system to develop and evaluate general purpose digital feedback controllers that will operate in the frequency range below ten hertz. An immediate area of application is in the control of turbo generators where additional signals, beyond the standard terminal voltage feedback, are used to provide damping. The feedback of such signals as the machine output electrical power has recently proved advantageous. The controller development system will be a powerful tool in further research in this area. It will allow the development of digital control techniques that could not previously be conveniently tested. Field test results are described where, as a convenient test case, the digital system satisfactorily emulated an existing power system stabilizer on Calgary Power's Sundance unit 3. Stripchart traces are included that, illustrate the performance of the digital controller relative to the existing installed analog controller. These tests were performed with the generator operating on-line near rated load conditions. The tests point out some of the attributes and shortcomings of the prototype digital controller.Thesis