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Register a new userUsing a Computer - Aided Program for Reliability Evaluation of Syrian Electrical Networks
استخدام برمجيات متخصصة في تقويم موثوقية شبكات كهربائية من المنظومة السورية
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يعرض البحث تعريفاً بتقانات النمذجة المستخدمة في عملية تقويم موثوقية الشبكات الكهربائية، كما يعرض برنامجاً متخصصاً، و هو برنامج (Power Factory (DIgSILENT يستخدم تقانات النمذجة لتمثيل الشبكات الكهربائية و دراستها، و من ضمنها حساب مؤشرات الموثوقية. هدف البحث هو اعتماد منهجية للتقويم الكمي لموثوقية شبكات التوزيع و تطبيقها على شبكة توزيع كبيرة نسبياً هي شبكة 20 kV لمدينة دمشق، و كذلك اقتراح إجراءات عملية لتحسين الموثوقية.
The research is traduces the simulation techniques used for reliability evaluation in electrical networks. A program called Power Factory (DIgSILENT) has been used for this purpose. A part of the distribution network 20 kV of Damascus, has been chosen in order to perform a reliability evaluation study. The input Data needed for electrical elements are quoted from the statistical data which are available at the public company for distribution of the electrical energy in Damascus. After performing the study, some of the reliability indices were calculated to give us, for the first time, an idea about the reliability situation of Syrian electrical distribution network. On the other hand, these results were compared to similar indices which are calculated at an European distribution network, and the difference has been shown. Suggestion of solutions to improve the reliability level is out of scope of this study, however a comparison between the actual state and SCADA supported state is applied on the studied network.
References used
R. Billinton and R.N. Allan, "Reliability Evaluation of Power Systems. 2nded", New York: USAL Plennum Press, 1996
Lawton L. et al,"a framework and review of customer outage cost", Lawrance Berkley National Laboratory,LBNL-54365,Nov2003
R.Y. Rubinstein, "Simulation and the Monte Carlo Method, J Wiley and Sons", New York, NY, 1981
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This research presents software programs that have been designed in order to evaluate the reliability in
electrical distribution networks, by calculating the reliability indices for 20 kV distribution feeders. It is
the first study in this field for the distribution network in Syria.
First of all, the mathematical models of reliability have been presented.
The purpose of this study is to define the reliability index for electrical power
systems specifically and without using alot of data and treating processes. Results of this
study is useful in electrical networks planning and design because of its
technical and
economical importance in the optimal choosing of networks elements and connections. In
this research we use petri nets concept to represent electrical nets under studying then
simulate the equivalent chart on GRIF program to find reliability degree for the system and
its elements. This research includes comparing the suggested methodology to a reference
net and then apply this method on electrical local network to discuss the results. It has
been proved that petri nets are effective in reliability calculations with the best of
simulation methods.
The deep-well pumps are practically and widely used to pump water up
from wells. These pumps are driven by squirrel-cage induction motors
where the pump is directly connected with the induction motor it drives.
They form a pump-motor set or a deep
-well set.
Economioally, the cost of digging a well proportionates with the diameter
of the hole opening.
This diameter is related to the deep-well set dimensions. Whenever the
dimensions of the deep-well set are small, the cost of digging a hole will
be notably less.
From here, in this research we shall test the possibility of desiging a
deep-well induction motor with a voltage of f =150 Hz frequency in a
small size. and in trifold speed of the induction motor which has same
power and functions as the motor with a voltage of f = 50 Hz frequency
and where the essential parameters of the motor aren’t worse than the
motor with f = 50 Hz Frequency.
One of the challenges to the operation of a large and interconnected power systems is to insure that generators will remain in synchronism with one another following large disturbances such as short circuits on transmission lines and bus bars with as
sociated operation of protection system.
In this research, the impact of short circuits and their sustained duration on Syrian power system was analyzed through the dynamic simulation of three-phase faults at substations with varying fault clearance time at these substations.
In addition, critical fault clearing times on 230kV, 400kV network and substation bus bars were determined, as well as the influence of distance protection and bus bar differential protection on Syrian power system.
This paper introduces an unconventional analytical method, namely Transient
Energy Function (TEF) method, and proves the capacity of the method. The
significant advantage of the used approach is that, integration of the swing equations
is in principle limited only to the fault-on period.
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