3188

3121

كارشناسي ارشد

﴿قدرت﴾

اصفهان: دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر

1384

ده، 143، [II]ص.: مصور، جدول، شكل، نمودار

ص. ع. به فارسي و انگليسي

جعفر سلطاني

فريد شيخ الاسلام

1396/02/12

كتابنامه

برق و كامپيوتر

مهندسي برق و كامپيوتر

ID3121

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

ABSTRACTIn the last three decades the robustness and stability of the electrical machine drives subject toparameter uncertainties and unknown load torque has been a challenge for researchers anddesign engineers in this field To solve this problem they have tried to develop differentnonlinear adaptive controllers for these systems Although in the last years the abovecontrollers have been designed and applied to the cage rotor induction machines littleattention has been paid to the Doubly Fed Induction Machine DFIM In this thesis theDoubly Fed Induction Machine is controlled based on nonlinear adaptive control methods Using the output state feedback control approach a robust nonlinear controller is derived firstin order to obtain a reference voltage vector to command the three phase two level SV basedPWM Inverter which feeds the rotor Then an adaptive backstepping observer is developedfor simultaneous estimation of rotor speed and rotor resistance In the second stage anadaptive backstepping controller is designed for the torque machine control in the condition ofunity power factor regulation measured at stator terminals Using this observer it is shownthat the drive system is robust against the rotor and stator resistance variations In the thirdstage a Sliding Mode SM controller is derived to follow a predetermined nominal trajectory Having combined this controller with backstepping observer described in the first stage makes the drive system performance robust subject to machine resistances uncertainties Finally upon assumption of measuring the rotor flux a composite nonlinear controller isdeveloped based on combination of SM control and adaptive backstepping control Thecomposite controller is able to make the system performance stable and robust against theelectrical parameter uncertainties The overall stability of this controller is proved byLyapanouv theory Finally the validity and effectiveness of the proposed control approaches inthis thesis are verified by computer simulation Two back to back voltage source two level SVM PWM inverters are employed in the rotor circuit in order to make the drive systemcapable of operation in the motoring and generating modes below and above synchronousspeed

جعفر سلطاني

فريد شيخ الاسلام