Ever-increasing size, complexity and operation costs in modern
power systems have stimulated the intensive study of an optimal
Load Shedding and Generator Rescheduling (LSGR) strategy in the
sense of a secure and economic system operation.
The conventional approach to LSGR has been based on the application of LP (Linear Programming)...
Conventional generators are operated at fixed speed,
and they lack the advantage of Variable Speed Generators
(VSG) i.e.a VSG system is capable to maximize the electromechanical
energy conversion process by varying the shaft
speed. This thesis deals with a VSG system which also
preserves all the functional features of a...
In high voltage direct current(HVDC) systems
transmission technology, a.c. power is
converted(rectified) to d.c. power by means of a
controlled rectifier bridge. This d.c. power is then
transmitted through a d.c. link to another
converter(inverter) where it is converted back to a.c.
power by means of another controlled rectifier bridge....
A DC-to-DC power converter was designed on the
basis of pulse-area modulation which is applied to a
series-resonant circuit with internal frequency of 10 Khz
The series-resonant circuit was placed directly in the
energy path which provides a means for the thyristors to
be naturally commutated.
The design was tested...
The brushless doubly fed machine (BDFM), or self-cascade
single-frame machine, can operate asynchronously or
synchronously over a wide speed range. In this sense the
machine becomes an adjustable speed synchronous machine.
Such machines may become unstable in certain regions of
operation. Analyzing its steady-state performance and
determining its stable operating...
The doubly-excited machine can be used as a variablespeed
generator or as a variable-speed-drive motor. In
this thesis the focus is on the aspects associated with
generating electric power (real and reactive) from erratic
energy resources such as water or wind. In such cases,
the power input to the prime...