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Register a new userAnalyze The Role of Inductors on Power flow between Power Electronic Devices and Electric Grid
تحليل دور الحثيات على قيمة و اتجاه جريان الاستطاعة بين مبدلات الاستطاعة الإلكترونية و الشبكة العامة
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تعتبر عملية التحكم بجريان الاستطاعة الفعلية و الردية من الأمور الهامة و الأساسية عند استثمار منابع الطاقات المتجددة (الشمسية و الريحية ...) و ربطها بالشبكة العامة. حيث أن معظم مصادر التوليد الموزع تستخدم مبدلات القدرة الإلكترونية لتحقيق عملية الربط و التحكم. تم في هذا البحث تحليل دور الحثية أو الملف Inductor, الذي يتم إضافته بين الأنظمة الإلكترونية و الشبكات، في التحكم بقيم و اتجاه تبادل الاستطاعات الفعلية و الردية. كما تم تبيان كيف أن تحقيق فرق صفحة δ بين توتر خرج أو دخل المبدل و توتر الشبكة ، تغيير قيمة الحثية الذاتية للملف، التحكم بزوايا الإزاحة بالطور للمبدلات، تحقيق فرق توتر على طرفي ملف الطور ، جميعها تساهم في التحكم بالاستطاعة الفعلية و الردية المتبادلة. تم في هذا البحث أيضاً معالجة و بيان آلية التحكم و ما يلزم تحقيقه لحسن تبادل و جريان الاستطاعة بين المنابع و الأحمال، مع بيان إمكانية العمل في الإحداثيات الأربعة للتوتر و التيار، و تبادل الاستطاعات الفعلية و الردية عند كافة ظروف التشغيل. كما تم أخيرا إجراء دراسة موجزة لتصميم و تحديد أبعاد مثل هذه الملفات.
Power Flow control is very important procedure when renewable sources are connected to electric grid. Furthermore, Most common topologies of grid tied distributed generation have inductor attached to power converters. In this article, the role of inductors linking between power converters and electric grid is analyzed. Values of these inductors can affect largely the value of Power flow (Active and Reactive power) in both sides, while phase angle between voltage of terminals determines the direction of power flow. This paper proposes MATLAB/SIMULINK models to study this impact, for different operation conditions (four quadrants I-V curves). Two methods of coils calculation are applied, in order to design the best value calculated in the proposed MATLAB/SIMULINK models.
References used
McDonald, John D.Electric Power Substations Engineering. s.l. : CRC Press, 2012
Rashid, M.Power Electronics handBook. USA : Elsevier, 2011. 978-0-12-382036-5
Wildi, Theodore.Electrical machines, Drives And Power Systems. s.l. : Pearson, 2006. 0-13-196918-8
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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.
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.
In this research we give a pattern that explain how to simulate
the wind farms via Etab. We use induction generator technique
(WTIG). We can see through results that this method is the
best way in reducing the power losses and building-cost.
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 out-of-stability state of synchronous generator which
connected to high voltage network due to the transient
situations which lead us to disconnect the generator causes
finincial and technical problems. Therfore the purpose of this
research i
s to study the stability of synchronous generator
working which connected to high voltage network through the
transient situation.This research present the posibilty of
returning the synchronous generator to synchronous-steadystate
at the late time of the transient state when the load
angle is in the out-of-stability zone through controling the
rotor-excitation and increasing the generator’s electric motive
force.This lead to increase the generator’s maximum power
and to increase the generator’s stability-torque which lead to
return the synchronous generator to synchronous-steadystate
without need of discconecting it from network.Then put
the mathmatical model.
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