Summary of subject lines like all components of the electrical power system, for
unexpected breakdowns for multiple reasons. This reduces malfunctions of the reliability
of the system, and is a source of threat to the continuity of power supply. In
order to
prevent these crashes completely is not feasible, you must design an integrated protection
system is being coordinated action among all its organs to identify and separate the
holidays quickly so the damage caused by this failure the system capacity as possible.
Network protection devices are installed to protect it from faults that may occur, and
prevent their spread and protect the system from un normal operating situations resulting
from such faults. protection systems to identify, classify and locate of faults through
systematic analysis of network parameters) voltages/currents, (and then send a signal to
circuit breakers on separation to separate and isolate the infected component.
This thesis took up the study of The effect of wind plants connection on protection system
in distribution networks on behaviour of protection devices used should (over current) and
compare the results with those protections work behavior when connection with regular
generators. we found through modeling and simulation results that a wind station to impose
changes on the structure of power system of protection zones and protection devices in
response to the types of faults occurring and the reason for the delay in the work of these
protections.
In this paper, a modern method of restoring service in electrical
power systems was examined through an automated
coordination center using genetic algorithms.
Operating the electrical power systems at normal conditions is our goal always. This
is what represents the ideal state of electrical power system work. Hence, the electrical
power system work in case of insufficient electrical power requires avoid
ing since it leads
to big losses in national economy.
These losses could be huge when we talk about connection borders between systems
as per overload frame, because of lack of electrical power request. The impact of these
conditions could be noticeably decreased at a reasonable limit of electrical power request.
When we find out the optimal solution of electrical power systems operation and the
communication lines between them while considering the losses of consumers
disconnecting that guarantee the stability of loads. Finally, it is so at full use of maneuver
(available cases) spare power properties when applying the instant correction of regime.
This paper studies the basic approach to solve these issues which imply the reliability
definitions.
This paper shows a new approach to determine the presence of defects and to classify the defect type online based on Artificial Neural Networks (ANNs) in electrical power system transmission lines. This algorithm uses current and voltage signals samp
led at 1
KHz as an input for the proposed ANNs without the involvement of a moving data window, so input data will be processed as a string of data. The model depends on three neural networks one for each phase and another fourth neural network for the involvement of the ground during the fault. Response time of the classifier is less than 5 ms. Moreover modern power system requires a fast, robust and accurate technique for online processing.
Simulation studies show that the proposed technique is able to distinguish the fault type very accurate. Also this technique succeeded in determining of all defect types under all system conditions, so it is 100 percent accurate, so it is suitable for online application.
يرتبط الاستقرار الساكن بالسلوك الديناميكي لنظام القدرة الكهربائية بعد تعرضه لاضطرابات خفيفة
مثل تغيرات في الأحمال أو التوليد أو فصل بعض التجهيزات.. الخ.
تم في هذا البحث تحليل معادلات الحالة الحدية للشبكة الكهربائية و الاستقرار الساكن، و استناداً إل
ى ذلك
قدمنا أسلوباً لتقييم هذا الاستقرار يعتمد على تغير إشارة مصفوفة اليعقوبي خلال عمليات التكرار
لحساب جريان الحمولة.
في هذا البحث تم تطوير هام للنظام البرامجي 1 Security لتحليل أمان نظام القدرة الكهربائية الذي كان
قد قُبل للنشر في مجلة جامعة دمشق. النظام البرامجي 2 Security الجديد لا يقوم فقط بتحليل الأحداث
المحتملة التي يمكن أن يتعرض لها نظام القدرة الكهربائية م
ن حيث جريان الاستطاعة الفعلية، و يكشف
الخطوط المحمَّلة تحميلاً زائداً، بل يستخدم أيضاً تقانة البرمجة الخطية لتعديل استراتيجية التوليد و تقنين
بعض الأحمال كإجراء تصحيح وقائي لإزالة التحميل الزائد عن الخطوط المرهقة. لقد تم تصميم النظام
البرامجي بلغة تربو باسكال و وفق شاشات حوار مع المستخدم، و تم التثبت من صحته بتطبيقه على شبكات
عملية اختبارية، كما استخدم لتحليل الأمان لجزء من الشبكة السورية لتوتر 230 ك ف. و تبين من خلال
النتائج أن البرنامج فعال و مرن و قادر على تنفيذ وظائفه بدقة مقبولة و سرعة قياسية على الرغم من
استخدام النماذج الخطية في بنائه.
The paper begins with an introduction that describes the concept and
importance of power system security. The mathematical model is built
depending on both the linear load flow technique and the sensitivity
factors for line and generation outages.
The algorithm has been designed
so that a power system of arbitrary bus number and voltage levels can be
studied. This algorithm has been programmed in Borland Pascal in
interactive mode, and the developed program has been tested on several
test systems. The Program has been used for security assessment of a part
of the Syrian 230 kV network. The obtained results have shown the
validity and effectiveness of the program in spite of using linear models.
It is worth saying that the developed program is the first one for security
assessment in Syria so far.
Application Of Object Oriented Programing OOP concept and the C++.
Pascal programming language to power system simulation has been
explored. An efficient platform for power system simulation applications
has been proposed. By emulationg a physical
power lap, a generic power
network container has been build, a module. One load flow applications a
ac load flow have been discussed. It is found that the OOP based Pascal
load flow programs are as efficient as their non – OOP counterparts.
