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Register a new userAn Expert System for Faulted Section Determination in Electrical Power System
نظام خبير لتحديد منطقة العطل في نظام القدرة الكهربائي
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يقدم هذا البحث نظاماً خبيراً جديداً لتحديد الجزء المصاب بالعطل في نظام القدرة الكهربائي و لتحليل أداء نظام الحماية (زواجل و قواطع). يتطلب النظام الخبير المقدم معلومات حول تكوين نظام القدرة الكهربائي و حول حالات تلامسات قواطع الدارة و زواجل الحماية (مفتوحة / مغلقة). يستطيع النظام الخبير المقدم تحديد الجزء المصاب بالعطل بسرعة و بدقة عالية لأجل كافة أنواع الأعطال، متضمنة الأعطال المتزامنة (Simultaneousfaults)، في نظام القدرة الكهربائي. النظام الخبير المقدم عام، أي يمكن استخدامه مع أي نظام قدرة كهربائي، و ذلك لأنه قمنا بفصل الحقائق (Facts) عن القواعد (Rules) بشكل كامل. لكتابة و اختبار النظام الخبير المقدم تم استخدام بيئة تطوير النظم الخبيرة CLIPS (آلة الإنتاج المتكاملة بلغة سي) التي تستخدم الربط الأمامي في الاستنتاج (forward chaining ). لقد تم اختبار أداء النظام الخبير المقدم على ثلاث أنظمة قدرة كهربائية اختبارية (IEEE–6 bustest system و IEEE–9 bustest system و IEEE–14 bustest system) و قد أبدى النظام الخبير المقدم أداءً مميزاً لأجل كافة الأنظمة المختبرة. لكن، تم في هذا البحث عرض نتائج أداء النظام الخبير لأجل نظام قدرة كهربائي اختباري ذي تسع قضبان تجميع (IEEE–9 bustest system).
This paper introducesa new expert system (ES) for faulted section determination in electrical power system andinterpretingthe performance of the protective system (relays and circuit breakers). The introducedESrequiresinformation about the power system configuration and about the contacts status (open/closed) of the circuit breakers and protective relays. It can determine the faulted section quickly and accurately for all types of faults including simultaneous faults. It is general, i.e.it can be usedwith any power system,due to the separation between the Facts and Rules. The introducedES isdeveloped and tested by CLIPS environment (C Language Integrated Production System) which uses forward chaining to derive conclusion. The performance of the introduced ES is tested for several power systems, IEEE–6 bustest system, IEEE–9 bustest system andIEEE–14 bustest system, and it shows a distinct performance for all tested systems. But for space limitation, we present in this paper the performance results of the introduced ES for the IEEE–9 bustest system only.
References used
CHIHIRO, FUKUI. , JUNZO,KAWAKAMI. An expert system for fault section estimation using information from protective relays and circuit breakers. IEEE Transactions on power delivery,Vol. PWRD-1, No. 4,1986
TOMSOVIC, K. , ACKERMAN, P. An expert system as a dispatchers' aid for the isolation of line section faults. IEEE Transactions on Power Delivery, Vol. PWRD-2, No. 3, 1987
GIRGIS, ADEL.B. , JOHNS, MELISA. A hybrid expert system for faulted section identificationfault type classification and selection of fault location algorithms.IEEE Transactions on PowerDelivery, Vol. 4, No. 2, 1989
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النظم الخبيرة
التداخلات الدوائية
الحالة الفيزيولوجية
الحالة المرضية
الآثار الجانبية
العائلة الدوائية
المادة الفعالة
الاسم العلمي
الاسم التجاري
الاستطبابات
Expert Systems
Drugs Interactions
Active Substrate
Medical Group
Genuine Name
Trade Name
physiological condition
pathological condition
Side Effects
Indications
المزيد..
Today worldwide distributed generation (DG) takes a very important role in the operation of
distributed electric power systems. However, the existence of distributed generation may have
impacts on different topics, such as fault currents, fault pro
tection, coordination schemes or
fault location. If there is short-circuit in the system, the presence of one or more distributed
generators can affect the fault current levels, the monitoring of voltages and currents at the
substation. The main supply generation will not have to inject as much power to the line because
of the DG and, therefore, voltages and currents at the substation will be different from the ones
that would be measured without DG .
Keeping the voltage within the required limits is one of the key issues of operating a power system. since the voltage in electrical power system is affected significantly by changes of loads and
equivalent circuit of the power system, there is a ne
ed to regulate the voltage with high control ability. Because of the growing use of FACTS in General and STATCOM among them in power systems to improve voltage stability, and because of the need for software that is not always available, the aim of research is to develop a mathematical model, algorithm and software for load flow analysis at the steady state of power system includes static synchronous compensator STATCOM.
The Jacobian matrix in the Newton –Raphson algorithm, which is the relationship between voltage and power mismatches, is extended with the STATCOM variables to adjust the voltage and control of the reactive power witch is injected or absorbed at the point of common coupling, with high controlability.
A Complete software has been developed that includes comprehensive control facilities and exhibits very strong convergence characteristics. A Sophisticated algorithm has been verified and the effectiveness of the program is tested by its application to a number of standard power systems
including the IEEE 5-bus system, and Syrian transmission network 400 kV.
with different frequency make Voltage Source Converter - HVDC link (VSC-HVDC links) an
attractive technology for most power transport in meshed grids. Advantages are the high
controllability of active and reactive power at the converter’s terminals
and the ability to increase the
stability of the surrounding AC system. VSC-HVDC can provide active and reactive control to achieve
maximum power transfer, system stability and improve power quality and reliability.
This research aims to develop a mathematical model and an algorithm for the analysis of power flow in
a steady state of power system containing VSC-HVDC.The Jacobian matrix inNewton-
Raphsonalgorithm, which is the relationship between voltage and power mismatches, is extended with
the VSC HVDC variablesto control active and reactive powers and voltage magnitude in any
combination. A Newton-Raphson load flow program has been developed which includes
comprehensive control facilities and exhibits very strong convergence characteristics. Two scenarios
have been studied, back-to-back VSC-HVDC link and full VSC-HVDC link connecting two buses in
AC networks. The algorithm and the program have been verified through a number of simulation
examples carried out on IEEE 14-bus System.
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