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Register a new userSensorless Speed Control of Doubly Fed Induction Generator in Wind Turbine
التحكم بلا حساس بسرعة مولد تحريضي مضاعف التغذية في العنفة الريحية
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Tishreen University مقالة
Publication date
2017
fields
Mechanical Power Engineering
and research's language is
العربية
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Shamra Editor
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يقدم هذا المقال مساهمة جديدة في مجال التحكم بالسرعة بدون حساسات للمقادير الميكانيكية لمولد تحريضي مضاعف التغذية في تطبيقات العنفات الريحية. حيث يتم مراقبة السرعة و العزم الديناميكي من أجل استخدامها في التغذية العكسية في حلقات التحكم. إن الخوارزمية المقترحة للتحكم بالسرعة بدون حساس لا تتأثر بتغيرات بارامترات الآلة حيث يتم مراقبة السرعة بشكل مستقل عنها. تتجنب الخوارزمية المستخدمة إجراء التفاضل و هذا يحسن بشكل كبير من عدم التأثر بإشارات الضجيج. اعتمدنا على نظرية التحكم الشعاعي بتوجيه الفيض المغناطيسي و ذلك للتحكم بسرعة الآلة التحريضية مضاعفة التغذية. المتحكمات المستخدمة في الحلقات المغلقة هي متحكمات تناسبية تكاملية تقليدية. تمت النمذجة بالاعتماد على معادلات بارك للآلة التحريضية و على نموذج مبسط لقالبة جهد ثلاثية الطور. تبين نتائج المحاكاة في برنامج MATLAB أداء جيد للتحكم المقترح بالسرعة من دون حساس.
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.
References used
GOGAS K. Design of a robust speed and position sensorless decoupled P-Q controlled Doubly-Fed Induction Generator for variable-speed wind energy applications. Department of Electrical and Computer Engineering McGill University Montreal, Quebec, Canada 2007, 28-39
CARDENAS R., PENA R.,PROBOSTE J., ASHER G., CLARE J. MRAS Observer for Sensorless Control of Standalone Doubly Fed Induction Generators. IEEE Transactions on energy conversion, VOL. 20, NO. 4, 2005,710-717
YANG Sh. Novel sensorless generator control and grid fault ride-through strategies for variable-speed wind turbines and implementation on a new real-time simulation platform. Graduate Theses and Dissertations, Digital Repository, Iowa State University, 2010, 35-44
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In this paper a robust control using a sliding mode control of the active and the
reactive power generated by a doubly-fed induction generator (DFIG) is
presented. It provides a robust regulation of the stator side active and reactive
power by cur
rents and it is suitable for both electric energy generation and
drive applications. The mathematical model of the machine written in an
appropriate d-q reference frame fixed with a stator flux in order to obtain the
decoupled system of control. In this case the control of the active and reactive
power flowing between the stator of the DFIG and the power network is
synthesized using sliding mode controllers. A good performance tracking is
guaranteed in terms of stator currents references.
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 pro
tection, 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 .
The turbine control purpose is to achieve the maximum limit of wind power,
associated with reducing the mechanical loads. The current control techniques do not take
into consideration the dynamical side of wind and turbine, which leads to power los
s. To
improve the effectiveness of the
nonlinear controllers, we can derive the nonlinear feedback controllers for static and
dynamic conditions in order to reach the wind speed estimator. Then we can test the
controllers by a mathematical model applied on the wind turbine simulator, with
disturbances and noise. The results have shown important improvements in comparison
with the current used controllers.
The aim of this paper is to investigate the overlap between lower atmospheric boundary layer and real wind turbine wake which installed not far from ground surface, Here we adopted rotating actuator-disk model (RADM) as a complex model of 3D actuator
-disk model, virtual blade modeling (VBM) and tip loss correction, in order to get more reliability and satisfied result.
Wind turbines have grown significantly in size over the last years and, it generally placed in an atmospheric boundary layer, then the assumption of uniform wind velocity cannot be valid.
The lower part of atmospheric boundary layer has a high level of turbulence intensity and great velocity gradients, then when wind turbine placed in these conditions, a high rate of fluctuation will occur subsequently power losses in wind farms, and change wake turbulence character which affects the flow-induced dynamic loads on downwind turbines.
The presented paper deals with an implemented speed sensorless direct vector control (DVC) technique based on stator flux orientation algorithm to estimate and control rotor speed of three phase induction motor (IM). The driver system is presented in
this paper has a three phase bridge uncontrolled rectifier and space vector pulse width modulated (SV-PWM) inverter to drive and control the speed of the (IM) at different mechanical load conditions. The rotor speed has been obtained by slip frequency estimation instead of use feedback speed sensor. The structure of Volt/Freq via PI-controller is used to control and adjust speed accuracy between required and estimation rotor speed to precise speed response. The proportional and time integration controller values obtain by Ziegler-Nichols closed-loop tuning method. Computer simulation results with Matlab/Simulink program show an acceptable speed control response, minimum error at steady state and dynamic condition, a results show also the stator voltage, current and flux estimated in direct-quadrate of stationary and synchronous reference frame at variation in load up to (10 N.m) beside the synchronous, slip and rotor speed estimation are varied between (250-1486 rpm).
Keywords: Induction Motor Drive System, Direct Vector Control, Speed Sensorless.
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