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Register a new userDesign of Computer Programs for Reliability Evaluation of Syrian Electrical Distribution Networks
تصميم برامج حاسوبية لتقويم موثوقية شبكات التوزيع الكهربائية السورية
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يعرض البحث برامج صممت بهدف تقويم موثوقية شبكات التوزيع في الشبكة الكهربائية السورية؛ و ذلك عن طريق حساب بعض مؤشرات الموثوقية لمغذيات توزيع رئيسية ذات توتر 20KV . و تكمن أهمية هذا العمل بأنه تضمن دراسة موثوقية بعض المغذيات الرئيسية في شبكة التوزيع السورية للمرة الأولى.
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.
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
Turan Gonen, "Electric Power Distribution System Engineering",2008
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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 cho
sen 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.
Reactive power compensation in distribution networks is one of the most important economic and
environmental issues in power system studies. In this paper the following points are investigated:
· The characteristics of the most developed equipment
used for reactive power compensation.
· Equations used in ETAP program calculation
· OCP is part of ETAP program which gives us the possibility to determine optimal reactive power
sizing and placement in distribution networks in order to achieve optimal Power loss and distribution
power system enhancement.
· ETAP program is applied on a part of Damascus suburb electrical network which was simulated by its
real parameters and the positive economical and technical results have been clarified.
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.
Kouttina is one of the most proper areas in Syria for building wind energy conversion system. This system could be coupled with Syrian electrical grid without expensive cost because of nearing from the grid. But the permanent changes of wind speed wi
th no stable mode, cause different amplitude and frequency voltages differ from Syrian electrical grid amplitude and frequency.
The goal of this research is to design proper wind energy conversion system for Kouttina area and control it, therefore we always obtain constant amplitude and frequency voltages equal to those of Syrian electrical grid for any wind speed and load.
The proper wind turbine with its generator was chosen depending on parameters of probability mathematic function, called Wiebull Function. After that the proper control system was designed for equaling the amplitude and frequency of wind energy conversion system output with those of Syrian electrical grid. The buck -boost converter was controlled by proportional integral (PI) controller to always have DC output voltage equal to (622V). While the inverter controller was achieved by using two PI control loops, the outer loop for voltage control and the inner loop for current control. Though, three phase voltage with RMS phaser value of (220V) and frequency value of (50Hz) is achieved.
To validated the correctness and effectiveness of the proposed system, it was modeled using MATLAB program. The results showed the system ability of obtaining voltage with constant amplitude and frequency and this values do not change with wind speed or load changes.
With the increasing use of technologies and automation in different sides of modern life, the outage of
electricity became a big issue that widely affects the daily life of most sectors like industrial, economical or
even entertaining sector. So it
became so necessary to achieve a high-reliability electrical system to insure
the continuation of electricity supply to the end consumer.
Consequently, in this research, we are studying a new method of service restoration using genetic
algorithms to increase the reliability of distribution systems and improving its performance. The research
includes a brief aver view of electrical systems reliability and the basics of Genetic Algorithms and the use
of these techniques in dispatching centers. In addition we have designed a program in "MATLAB"
environment to apply the service restoration technique using genetic algorithms, and the program has
been tested on a case study with the relative results shown .
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