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Register a new userImpact of Doubly Fed Wind Generators on Electrical Power System during Balanced Faults in Transmission Network
أثر المولدات الريحية ذات التغذية المضاعفة في نظام القدرة الكهربائية في حالة الأعطال المتوازنة في شبكة النقل
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أخذ التوليد الموزع المنتشر عالمياً دوراً مهماً في تشغيل أنظمة توزيع القدرة الكهربائية. و على أية حالة، فإن وجود التوليد الموزع له تأثيرات في موضوعات مختلفة مثل تيارات الأعطال و الحمايات من الأعطال و مخططات عمل نظم الحماية. في حال وجود قصر كهربائي في النظام، فإن وجود منبع توليد موزع أو أكثر يمكن أن يؤثر في سوية تيارات القصر، و في مراقبة التوترات و التيارات في المحطات الفرعية. إن منبع التوليد الرئيسي ليس عليه أن يحقن استطاعة إضافية في الخط بسبب منبع التوليد الموزع، و بناء على ذلك ستكون التيارات و التوترات في المحطات الفرعية مختلفة عن تلك المقيسة دون وجود التوليد الموزع.
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 protection, 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 .
References used
Kala Meah, Member, IEEE, and A.H.M. Sadrul Ula, Senior Member, IEEE " Simulation Study of the CIGRE HVDC Benchmark Model with the WSCC Nine-bus Power System Network
Alpay Özcan, Member, IEEE, and Heinz Schättler,"A Computational Method for the Calculation of the Feasibility Boundary and Clustering in Differential-Algebraic Systems", SEPTEMBER 2005
Natthaphob Nimpitiwan, Student Member, IEEE, and Gerald T. Heydt, Fellow, IEEE Department of Electrical Engineering, Arizona State University: "Fault Current Issues for Market Driven Power Systems with Distributed Generation", June 2005
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Worldwide wind turbines have steadily increased. They are very different in nature from conventional
generators.
Induction generators in large scale are used in wind turbines for their simple construction and reliable
operation.
With the increase
in penetration of wind turbines, the power system dominated by synchronous
machines will experience a change in dynamics and operational parameters.
This paper aims to analyze the impact of induction generators on transient and small signal stability of
power systems by gradually increasing the rate of power generated by wind turbines and changing the
location of these turbines in the power system.
This paper shows a new approach to determine the presence of defects and to classify the defect type online based on Artificial Neural Networks (ANNs) in electrical power system transmission lines. This algorithm uses current and voltage signals samp
led at 1
KHz as an input for the proposed ANNs without the involvement of a moving data window, so input data will be processed as a string of data. The model depends on three neural networks one for each phase and another fourth neural network for the involvement of the ground during the fault. Response time of the classifier is less than 5 ms. Moreover modern power system requires a fast, robust and accurate technique for online processing.
Simulation studies show that the proposed technique is able to distinguish the fault type very accurate. Also this technique succeeded in determining of all defect types under all system conditions, so it is 100 percent accurate, so it is suitable for online application.
This paper presents a new contribution the domain of sensorless speed control of
doubly-fed induction generator in wind turbine applications. Where the speed and the
dynamic torque are estimated and used to feedback the control loops. The proposed
sensorless algorithm is robust to variations of the values of machine parameters where the
estimated speed is independent of them. The algorithm avoids using differentiation which
significantly improves its immunity to noise. The field oriented vector control theory is
used to control the speed of the doubly fed induction machine. The used controllers in
closed loops are classical proportional integral (PI). The modeling is based on the Park
equations of the induction machine and on a simple model of the three phase inverter. The
results of simulink on MATLAB provide good performance of the sensorless speed
control.
This paper deals with the performance study of the self-excited
induction generator when driven by wind turbine for producing
electrical energy. This was done by modeling both the induction
generator and the wind turbine using the Matlab program,
and
depending on the general theory of electrical machines. method for
this system by studying together the mechanical characteristics of
the wind turbine and operating characteristics of the induction
generator.
With the increased loading of Syrian power system, the
problem of maintaining the voltages within the acceptable ranges
has become a major concern in power system planning and
operation.
The purpose of this research is studying Impact of Connecti
on
Shunt Capacitors as facility to improve voltage and evaluate the
voltage profile in the Syrian transmission network 230-400kV,
determine weak bus bars of voltage, as well as the generation ,the
consumption and losses of active and reactive power.
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