الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
It is important to have an analytical method to predict the voltage collapse in the
power systems, particularly with complex and large power systems. In this thesis, a
developed Newton Raphson method is applied to find the voltage profile before and
after improving voltage. A new method, Field Programmable Gate Array (FPGA)
circuit is used to address reactive power compensation as an on-line solution of this
problem. A steady state analysis is applied to model the voltage collapse problem.
The model analysis method is used to investigate the stability of the power system.
Q-V curves are used to confirm the obtained results by model analysis method and to
predict the stability margin or distance to voltage collapse based on reactive power
load demand.
The load characteristics are considered in this thesis. Different voltage dependent
loads are proposed in order to be used instead of the constant load model. The load is
connected to several selected buses. The analysis is performed for two well-known
systems, Western System Coordinating Council (WSCC) 3-Machines 9-bus system
and the IEEE 30-bus system. The model analysis technique is performed for all
systems using the constant load model, the voltage dependent load models. Then, the
most critical mode is identified for each system. After that, the weakest buses, which
contribute the most to the critical mode, are identified using the participation factor.
The Q-V curves are generated at specific buses in order to check the results obtained
by the model analysis technique and to estimate the stability margin or distance to
voltage collapse at those buses. The FPGA can be solving this problem on –line
using reactive power compensation using tow Spartan 3 Kit design programmable
xilinx program using( VHDL), first Spartan 3 Kit is receive data from computer and
second Spartan 3 Kit transfer data to sub distribution board connect to the power
system. The application of this proposes approach two different cases of study
showed satisfactory result convent with different methods.