الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 130 |  |  |
| | | from | 130 | | |
Abstract
With the advent of interconnection of large electric power
system. many new dynamic power system problems have emerged. These
problems include, (for example) the low frequency oscillation of
power system, the sub-synchronous torsional oscillation of
turbines in a steam plant of a capacitor compensated lines, etc.
The design of supplementary controllers for low frequency
oscillation, currently known as power system stabilizers (PSS):
the excitation system stabilizer (ESS), and the governor system
stabilizer (GSS), is involved to enhance the dynamic performance
of power systems.
The aim of this study is to investigate the dynamic
performance of an industrial power system, Abu-zaabal Fertilizers
and Chemicals Company power station when interconnected with the
Egyptian Unified Grid (EUG), based on a new stabilizer design
procedure. The station consists of a 7.5 MVA, 6.3 k~
turbo-generator, two interconnected power cable 2 kM long, 240 mmcross
section and a substation of 11/6.3 kV, 10.5 MVA capacity.
The factory consists of an induction motor load of 1.6 MW. 6.3 kV
in addition to an auxiliary load of 0.6 MW, 0.4 kV (meduirn and
small motors, lighting, and some heaters). An optimal
multi-channel stabilizer is designed. The procedure of
multi-channel stabilizer design is based on the minimization of a
given quadratic performance index. Various input signals are used
in this stabilizer which use local measurements to drive the
feedback stabilizing signal to generator exciter and speed
governor. Moreover, the load dynamics may have a significant
influence on the system overall dynamic performance. Therefore.
the effect of load dynamics on the design of the PSS ill general
and on the system performance in particular is also investigated.
Eigen-value analysis and time domain response are used to
evaluate the performance of designed stabilizers.
The simulation results show that the multi-channel stabilizer
has a significant contribution from the point of view of the
system dynamics. In addition, for the system given operating
conditions, the dynamic load has a significant influence on the
design of conventional power system stabilizers.