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Register a new userDeveloping Algorithm and Program for Power Flow Analysis in Power System with VSC-HVDC
تطوير خوارزمية و برنامج حاسوبي لتحليل جريان الاستطاعة في نظم القدرة الكهربائية الحاوية على نظام VSC-HVDC
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إن الحاجة إلى قابلية تحكم عالية في شبكات التيار المتناوب و/أو ربط أنظمة قدرة غير متزامنة (ذات تردد مختلف) يجعلان من نظام حلقة الوصل بالتيار المستمر عالي التوتر- مبدل منبع توتر VSC-HVDC link تقانة جذابة لمعظم شبكات نقل القدرة الكهربائية.من ميزات نظام VSC-HVDC قابلية التحكم العالية بالاستطاعة الفعلية و الردية على طرفي المبدلات و القدرة على حسين استقرار أنظمة القدرة AC المحيطة به. يتيح التحكم بجريان الاستطاعة تحقيق نقل استطاعة أعظمي، و استقرار نظام القدرة و تحسين جودة الطاقة الكهربائية و موثوقيتها. هدف البحث إلى تطوير نموذج رياضي و خوارزمية لتحليل جريان الاستطاعة في الحالة المستقرة لنظام قدرة كهربائية يحتوي على VSC-HVDC وسعت مصفوفة اليعقوبي في خوارزمية نيوتن- رافسون، و هي العلاقة بين التوتر و الاستطاعة في حالات عدم التطابق, بنتغيرات النظام VSC-HVDC من أجل التحكم بكل من الاستطاعة الفعلية و الردية و قيمة التوتر بشكل مستقل. أنجز برنامج حاسوبي، تضمن وسائل التحكم في بارامترات VSC-HVDC و أعطى خصائص تقارب عالية جداً. تضمنت الدراسة النظام BTB) VSC-HVDC link ) مبدلاه متصلا نعقب-عقب مباشرة و النظام full VSC-HVDC الذي يصل بين قضيبي تجميع تيار متناوب عبر حلقة وصل تيار مستمر DC link . جرى التحقق من الخوارزمية المطورة و فعالية البرنامج المنجز من خلال تطبيقه على عدد من الأنظمة القياسية و منها ما جرى على IEEE 14-bus system .
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.
References used
S. Cole, D. Van Hertem, L. Meeus, R. Belmans, "Technical developments for the future transmission grid", IEEE, International Conference on Future Power Systems 2005
D. Van Hertem, J. Verboomen, R. Belmans, W. L. Kling, "Power flow controlling devices: An overview of their working principles and their application range", IEEE, International Conference on Future Power Systems 2005
G. Asplund, K. Eriksson, K. Svensson,"DCtransmission based on Voltage Source Converters," Cigré, Colloquium in South Africa 1997
Mohan N., Undeland T. M., Robbins W. P., "Power electronics-Converters, Applications, and Design", 2003, John Wiley & Sons Inc
.M. M. de oliveira."Power Electronics for Mitigation of Voltage Sags and Improved Control of ac Power Systems", Ph.D. thesis, Royal Institute of Technology, ISSN-1100- 1607, TRITA-EES-0003, Stockholm, Sweden, 2000
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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.
Unified Power Flow Controller (UPFC) plays a vital role in improving the power system
performance, both the static and dynamic, and enhanced the system loading capability by
rerouting the power flow in the network.
This paper presents control and
performance of UPFC intendedfor installation on the
transmission line to control power flow and improve voltage profile.
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.
The use of DC and especially VSC-HVDC systems are
considered as urgent and important in electrical networks to
improve their efficiency because they have great benefits not only in
connecting different frequency networks and connecting the
renewa
ble energy to the network, but also control power flow in a
way that reduce the losses and achieve the optimal flow electrical
networks especially in networks that contain more than one energy
supplier and thus can achieve economic benefits as well as the
scheduling of importing energy from another that may improve
network stability.
Types of HVDC system and a comparison between them are
achieved in this research after that simulation IEEE with VSCHVDC,
and integrated computer program was proposed this
program can create and store three-dimension matrix so the working
area can be scanned so minimum loss working point can be
detected.
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.
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