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Title: A general study of the transient stability of synchronous machines
Author: Harley, Ronald Gordon
Awarding Body: University of London
Current Institution: Imperial College London
Date of Award: 1969
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An investigation has been carried out into methods of representing synchronous machines in stability studies. Methods of improving the steady-state stability have also been studied. Different types of large transient disturbances are analysed and the methods of analyses are classified according to the assumptions made. Mathematical models are developed to include some of the phenomena commonly neglected in digital computer studies. Damping is allowed for more accurately than by the simple method using a torque proportional to slip. An even more accurate solution also includes terms .which depend on the rate of change of the flux linkages and it is used to assess in detail the "back-swing" after a three. phase fault. A comparative study is made of various numerical integration techniques suitable for a digital computer. Steady-state stability studies of a machine with two field windings are carried out by linearising the system equations for small disturbances and using Nyquist's criterion. The excitation of the one winding is regulated by a rotor angle feedback signal and that of the other winding by a voltage feedback signal. Various regulators are considered with different transfer functions. Transient and steady-state stability calculations are compared with test results of a 30 NW turbo-alternator incorporating voltage regulators and a governor, as well as with test results obtained from micro-machine experiments. All the experimental and theoretical results show reasonable agreement.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available