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|Title: ||Digital simulation of a gas-turbine generating unit|
|Authors: ||Hung, William W-C.|
|Issue Date: ||1983|
|Publisher: ||© William Wing-Cheung Hung|
|Abstract: ||Most existing synchronous machine stability studies are based on
the assumption that the machine is operating on an infinite
busbar of constant voltage and frequency. The present study
however, is concerned Mainly with the dynamic stability of the
type of gas-turbine generating unit commonly used in remote
sites, such as off-shore oil rigs and desert areas, where the'
grid is far from stiff and is liable to become unstable in the
event of a severe system disturbance. Because of this, there is
a pressing need for an accurate representation of the system, to
enable investigations to be made into problems concerned with
the system response and to consider any improvements that may
be effected in the associated control scheme.
The initial stage of the investigation involves the development of
digital models for a synchronous machine, using both
direct-phase co-ordinates and a stationary 2-axis representation.
Symmetrical and unsymmetrical faults at the generator terminals
are simulated and comparisons with test results are made.
Despite being more restricted in its range of application than the
direct-phase representation, the 2-axis model is used throughout
the remainder of the investigations described in the thesis,
Mainly because of its computational convenience.
The increasing use of large induction motor drives makes it
necessary to study their effect on system stability, especially in
the case of small gas-turbine power systems. Various types of
switching transients on both small and large squirrel-cage
induction motors are therefore studied. The successful
development of the synchronous and induction machine models is
followed by a fault simulation of a composite system containing
both types of machines.
The machine investigation is followed by the simulation of a
conventional steam turbo-alternator unit operating on an infinite
grid system. Various types of system disturbances are simulated
and the effect of generator saturation on the system response is
considered. Following this study, a mathematical model of a
gas-turbine generating unit is developed, with emphasis given to
operation in an isolated grid situation. To validate this model,
correlations between predicted and test results on a typical
installation are presented.|
|Description: ||A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.|
|Appears in Collections:||PhD Theses (Mechanical, Electrical and Manufacturing Engineering)|
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