Oscillatory behaviour of electrical machines connected to long transmission circuits
Oscillatory behaviour of electrical machines connected to long transmission circuits
This-thesis describes the development of comprehensive algorithms for the study of the shaft oscillatory behaviour of turbo-generator units connected to long-line series compensated power systems. During recent years the problem associated with connecting large turbo generators, which incorporate extended shaft dynamical systems, to power systems in which subsynchronous resonance is a distinct possibility, or, for which a disturbing influence may initiate high shaft stresses, has been constantly under review. Many developments in solution methods have been made and suggested during the past five years and it is in this context that the present thesis seeks to make its contribution to this pattern of work. The method of solution is illustrated by reference to simulated results for two practical overseas long-line schemes for which comprehensive data was made available.The type of oscillatory behaviour studied may be divided into two main categories. The first is concerned with self-excited oscillations brought about as a result of subsynchronous resonance between the external circuit inductance and the inserted series capacitance, which is necessary for the adequate control of long-line systems and the second category of oscillatory behaviour is concerned with externally initiated shaft oscillations, such as those caused by switching actions of fault application. Digital computer programs are derived for both linear and dynamic formulations. These programs are based on the developed algorithms which incorporate a full representation of the component parts of the system including rotational and static electrical plant and all relevant system controlling functions. To facilitate economical solutions the linear analytical approach is used to define likely areas of instability before implementing the more rigorous dynamic analytical methods which can cater for the representation of normal and abnormal operating conditions.
University of Southampton
1978
Abdallah, Hassan Mohamad
(1978)
Oscillatory behaviour of electrical machines connected to long transmission circuits.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
This-thesis describes the development of comprehensive algorithms for the study of the shaft oscillatory behaviour of turbo-generator units connected to long-line series compensated power systems. During recent years the problem associated with connecting large turbo generators, which incorporate extended shaft dynamical systems, to power systems in which subsynchronous resonance is a distinct possibility, or, for which a disturbing influence may initiate high shaft stresses, has been constantly under review. Many developments in solution methods have been made and suggested during the past five years and it is in this context that the present thesis seeks to make its contribution to this pattern of work. The method of solution is illustrated by reference to simulated results for two practical overseas long-line schemes for which comprehensive data was made available.The type of oscillatory behaviour studied may be divided into two main categories. The first is concerned with self-excited oscillations brought about as a result of subsynchronous resonance between the external circuit inductance and the inserted series capacitance, which is necessary for the adequate control of long-line systems and the second category of oscillatory behaviour is concerned with externally initiated shaft oscillations, such as those caused by switching actions of fault application. Digital computer programs are derived for both linear and dynamic formulations. These programs are based on the developed algorithms which incorporate a full representation of the component parts of the system including rotational and static electrical plant and all relevant system controlling functions. To facilitate economical solutions the linear analytical approach is used to define likely areas of instability before implementing the more rigorous dynamic analytical methods which can cater for the representation of normal and abnormal operating conditions.
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Published date: 1978
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Local EPrints ID: 459974
URI: http://eprints.soton.ac.uk/id/eprint/459974
PURE UUID: f5eeed67-b91e-4075-82e1-db45d6eff093
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Date deposited: 04 Jul 2022 17:32
Last modified: 04 Jul 2022 17:32
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Author:
Hassan Mohamad Abdallah
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