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Register a new userدراسة استقرار المحركات التحريضية عن طريق حساب التوتر الحدي
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Damascus University ورقة بحثية
Publication date
2003
fields
Electrical Power Engineering
and research's language is
العربية
Authors
عبد المطلب أبو سيف( باحث )
Created by
Shamra Editor
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النظر للدور الكبير الذي تؤديه المحركات التحريضية عالية الاستطاعة في الوقت الحاضـر في مختلف فروع الصناعة فمن المهم جداً دراسة سلوك هذه المحركات في مختلف حـالات التشغيل، خاصة في الحالات العابرة، و ذلك من أجل إيجاد السبل لاستثمارها بالشكل الأمثل و الحفاظ على استقرارها و تجنب الخسائر التي يمكن أن تنجم عن تعطلها عن العمل. و نظـراً لأن عمل المحركات التحريضية يتعلق إلى حد كبير بالتأثير المتبادل بينهـا و بـين شـبكة التغذية لذلك كان الهدف من هذا البحث هو دراسة استقرار المحركات التحريضـية عاليـة الاستطاعة التي تعمل في ظروف شبكات التغذية الصناعية عن طريق حساب التوتر الحرج، مع الأخذ بالحسبان تأثير تغير توتر التغذية و نسبة تحميل المحركات التحريضية في درجـة استقرارها.
No English abstract
References used
الآلات الكهربائية- ٣ (الآلات اللاتزامنية). الدكتور الياس جبور .منشورات جامعة دمشق- 1984
Knyazevski B. A., Leipkin B.U. Industrial Plants Power supply. Second edition. High School, Moscow 1979
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The deep-well pumps are practically and widely used to pump water up
from wells. These pumps are driven by squirrel-cage induction motors
where the pump is directly connected with the induction motor it drives.
They form a pump-motor set or a deep
-well set.
Economioally, the cost of digging a well proportionates with the diameter
of the hole opening.
This diameter is related to the deep-well set dimensions. Whenever the
dimensions of the deep-well set are small, the cost of digging a hole will
be notably less.
From here, in this research we shall test the possibility of desiging a
deep-well induction motor with a voltage of f =150 Hz frequency in a
small size. and in trifold speed of the induction motor which has same
power and functions as the motor with a voltage of f = 50 Hz frequency
and where the essential parameters of the motor aren’t worse than the
motor with f = 50 Hz Frequency.
Induction motors are the most widely used electrical motors due to their reliability,
low cost and robustness. However, induction motors do not inherently have the capability
of variable speed operation. Due to this reason, earlier dc motors were a
pplied in most of
the electrical drives. But the recent developments in speed control methods of the induction
motor have led to their large scale use in almost all electrical drives.
Out of the several methods of speed control of an induction such as pole changing,
frequency variation, variable rotor resistance, variable stator voltage, constant V/f control,
slip recovery method etc, the closed loop constant V/f speed control method is most widely
used. In this method, the V/f ratio is kept constant which in turn maintains the magnetizing
flux constant so that the maximum torque remains unchanged. Thus, the motor is
completely utilized in this method.
The research was
depended on the concept of Partial Relative Indicators (PRI) for the
resulting harmonics as a new way to detect the fault through
determination of relative indicator PI of each type of harmonics that
result during the operation of motor at the different loads.
This paper presents an important idea about the higher harmonics (both temporal and
spatial) and the reason of their appearance and negative effects they cause on the electrical
power consumers. Generated rotating torques from upper harmonics is th
en calculated, and
their effect on the mechanical characteristics of the induction motor, and how to mitigate
this effect depending on motor design.
Higher harmonics produce additional electrical and magnetic losses in induction
motors which increase the motor’s heat and decrease its energy yield and power
coefficient. This research shows how to decrease these losses to improve the mechanical
characteristics of the induction motor and enhance the performance.
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.
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