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Register a new userMultilevel Voltage-Sourced Converters for HVDC and FACTS Applications
معرجات التوتر النصف جسرية و المتعددة السويات المستخدمة في الأنظمة (HVDC& FACTS)
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إن التطورات الحالية في خطوط (HVDC) و التجهيزات المرنة (Flexible AC Transmission Systems (FACTS)) سيطرت عليها تقنيتان جديدتان، الأولى هي استخدام خطوط التوتر المستمر العالي جداً من أجل نقل الاستطاعات الضخمة، و الثانية زيادة استخدام معرجات التوتر (Voltage (Source Converters (VSC) في دارات خطوط التوتر العالي المستمر و الأنظمة المرنة (FACTS).
Recent developments in the area of HVDC and FACTS are dominated by two new technology trends. This first is the introduction of ultra high dc voltage systems for bulk power transmission, and the second is the increased application of voltage-sourced converters (VSC) in HVDC and FACTS schemes.
References used
Hashim W., Power Electronic2, Electric Power Department, Faculty of Mech. & Elec. Engineering, Damascus University, 2009
Hashim W., Jamal A. Lectures in Power Electronic2, Electric Power Department, Faculty of Mech. & Elec. Engineering, Damascus University, 2010-2011
T. Bruckner and D.G. Holmes, "Optimal Pulse Width Modulation for Three-Level Inverters," Proceedings of the IEEE Power Electronics Specialist Conference, volume 1, pages 165-170، June 2003
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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.
The contribution of our research include building an artificial neural
network in MATLAB program environment and improvement of
maximum loading point algorithm, to compute the most critical
voltage stability margin, for on-line voltage stability a
ssessment,
and a method to approximate the most critical voltage stability
margin accurately. a method to create a (ARTIFICIAL NEURAL
NETWORK) approach.
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 aim of this study is to calculate the electrical field (EF) of some
types of high voltage insulators by using numerical methods. There
are different methods, which are used to do this, finite element is
the most important one.
It is possible
to find EF in 2D or 3D systems by using
Matlab/pdetool, which distinguishes with big capabilities in
calculation and view the results, additionally, it is available, cheap
and can save time and money for doing this important calculations
in high voltage applications .
The problem of gliding discharges on high voltage equipment is faced in practice, coith inclined interface, such as cable terminations, bushings.
Many researches present very important results about the relationship between the applied voltages and
this partial discharge . But studies about the insulation systems that have small cross capacitor or that have air gaps are limited, considering many points, one of them: the discharge procedure looks
like the partial discharge in insulators, with longitudinal interfaces.
Achieving precise relationships for such systems and finding the actual discharge behavior gives high scientific efficiency and important application for design of high voltages devices, especially when high voltages, which are changing with time voltage like alternatring and lightning voltages, are applied.
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