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Register a new userComputer Program STABILITY3 in Delphi for Transient Stability Analysis of Power Systems Using Transient Energy Function Method
برنامج Delphi بلغة STABILITY 3 لتحليل الاستقرار العابر لنظام قدرة كهربائية باستخدام طریقة تابع الطاقة العابرة
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Added by
Damascus University ورقة بحثية
Publication date
2001
fields
Electrical Power Engineering
and research's language is
العربية
Created by
Shamra Editor
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هذا البحث یقدم طریقة تحليلية غير تقليدیة هي طریقة تابع الطاقة العابرة، و یبرهن قدرة هذه الطریقة على تحليل الاستقرار العابر بأقل جهد حسابي لا یتطلب حل معادلات التأرجح التفاضلية إلاّ مرحلة واحدة هي مرحلة في أثناء العطل.
This paper introduces an unconventional analytical method, namely Transient Energy Function (TEF) method, and proves the capacity of the method. The significant advantage of the used approach is that, integration of the swing equations is in principle limited only to the fault-on period.
References used
P.Kundur : Power System Stability and Control McGraw-Hill 1994
P.W. Sauer, M.H Pai : Power System Dynamics and Stability Prentice Hall 1998
H. Saadari: Power System Analysis Senior Consulting Editor 1999
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One of the challenges to the operation of a large and interconnected power systems is to insure that generators will remain in synchronism with one another following large disturbances such as short circuits on transmission lines and bus bars with as
sociated operation of protection system.
In this research, the impact of short circuits and their sustained duration on Syrian power system was analyzed through the dynamic simulation of three-phase faults at substations with varying fault clearance time at these substations.
In addition, critical fault clearing times on 230kV, 400kV network and substation bus bars were determined, as well as the influence of distance protection and bus bar differential protection on Syrian power system.
Efforts are being made to connect many wind farms to Syrian electrical network As of Wind turbine the
increases; their Cumulative impact on dynamic operational characteristics of power system will increase.
In this paper, the impact of constant spe
ed wind turbines utilizing squirrel cage induction generators, the
most worldwide spread nowadays, on the transient stability of Syrian power system is analyzed.
Various aspects have been considered like wind turbine penetration level, fault location on power system
overhead lines and network topology transforming.
Results of this study show that wind turbine farms planned to be connected to Syrian electrical network
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the fault location and network topology transforming caused by double circuits of overhead lines.
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.
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
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examples carried out on IEEE 14-bus System.
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