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Register a new userدراسـة موثوقية شـبكات التوزيع الكهربائية باسـتخدام التمثيل المباشر و العكسي
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نديم مخول( باحث )
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إن الهدف الرئيسي في هذه الدراسة هو التقدير الكمّي لبارا مترات موثوقية التغذية للأحمال في شبكات التوزيع الكهربائية لما لها من أهمية خاصة عند اختيار الحل الأمثل في مرحلة التصميم، و ذلك انطلاقاً من حساب التكاليف بشكل رئيسي في مرحلة الاستثمار، و الاستفادة من هذا التقدير عند مناقشة خطط التطوير المستقبلية، و لتحقيق هذا الهدف تم تشكيل نموذج رياضي و بناء خوارزمية.
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References used
( Jerzy Sozanski , Niezawodnosc Urzadzen I Ukladow Elektroenergetycznych, PWN, Warszawa 1974, Poland. ( In Polish
( Jerzy Sozanski , Niezawodnosc Zasilania Energia Elektryczna, WNT, Warszawa 1982, Poland. ( In Polish
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تعدُّ شبكات توزيع الطاقة الكهربائية الشعاعية أحد أبرز أجزاء نظام القدرة الكهربائيـة التـي
توصل الطاقة الكهربائية إلى المستهلك، لذلك فإن دقة حسابات هذه الشبكات يجب أن تراعـى
بشكل جيد من خلال اتباع أساليب و طرق حديثة تعتمد على استخدام الحاسوب. في هذا
البحث
و ضمن هذا الإطار سوف نقترح طريقة لتمثيل الشبكات الشعاعية في ذاكرة الحاسـوب، إذْ إنَّ
هذه المسألة هي الخطوة الأولى التي يجب التفكير بها عند حل أي مسألة شـبكات كهربائيـة
باستخدام الحاسوب. إن الطريقة تعتمد على تمثيل الشبكة الكهربائية الشـعاعية فـي ذاكـرة
الحاسوب باستخدام مصفوفة التشكيل العكسي.هذه المصفوفة سيتم اسـتنتاجها عـن طريـق
استخدام مجموعة من الخوارزميات الجزئية و بناءً عليها مجموعة من البرامج انطلاقـاً مـن
مصفوفة التشكيل المباشر للشبكة.
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.
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 objective of this work is to study and design a module of super capacitors for recovering the braking
energy in trolleybuses. The module of super capacitors is charged and discharged by Buck-Boost
converter that is reversible in current. The co
ntrol and the smoothing elements of the converter are
designed with taking into account the non-linear nature of super capacitors. To recover quickly the
braking energy, the module is charged with constant current, while the discharging is done with constant
voltage on the DC link of trolleybus. The module of super capacitors in its different operations (starting
up, powering auxiliary equipments, braking) is simulated in the SIMPLORER environment. As a result,
the different operating values (as voltage, current and temperature) are determined for the elements of
the studied module (diodes, IGBTs, capacitor, super capacitors). Finally, the failure rate and the
reliability of the module elements are estimated depending on the different operating factors. The module
faults is analyzed.
Unified Power Flow Controller (UPFC) is one of the most effective Flexible AC
Transmission Systems (FACTS) devices for controlling power flow and improving stability
of power system. To achieve the functionality of UPFC, a proper and sufficient con
trol
system should be designed for this device. Our research proposes a Fuzzy Logic control
approach to control UPFC. The proposed control scheme is used to control and coordinate
voltage and phase angle signals of Voltage Source Converters (VSCs) of UPFC, where
these two signals are used to control active and reactive power flow in transmission line.
To validate the proposed control scheme, a single-machine double line infinite bus power
system equipped with UPFC is modeled using PSCAD/EMTDC software package. Three
phase fault with ground case is simulated and investigated under the proposed controller.
The modeling and simulation results show the effectiveness of the UPFC under the
proposed control scheme for improving power system stability under the three phase fault
case. The results also show the robustness and superiority of the proposed controller
compared to conventional PI controller as well as it guarantees the closed-loop stability
system and has a good tracking behavior.
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