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M. Sc. (Engg.) in Electronics System Design Engineering
GREESHMA S
CWB0913004 , FT-2013
5thModule Presentation
Module code : ESE2505
Module name : Power Electronics and Drives
Module leader: Ms. Sreekrishna
Presentation on : 19/03/2014
Vector control of Cycloconverters-WFSM Drive

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•INTRODUCTION
•VECTORCONTROLLEDIMPLEMENTATION
•PHASORDIAGRAM
•FEEDBACKSIGNALPROCESSINGFORVECTORCONTROL
•COMPUTATIONALEQUATIONS
•ADVANTAGES
•DISADVANTAGES
•CONCLUSION
•REFERENCES
Overview

3. M. S. Ramaiah School of Advanced Studies
3Introduction
Vectorcontrol,alsocalledfieldcontrol(FOC),isavariablefrequencydrive(VFD) controlmethodwhichcontrolsthree-phaseACelectricmotoroutputbymeansoftwocontrollableVFDinverteroutputvariables
Acycloconverterconvertsaconstantvoltage,constantfrequencyACwaveformtoanotherACwaveformofalowerfrequency
AsynchronousmotorisACmotorinwhichthesteadystate,therotationoftheshaftissynchronizedwiththefrequencyofsupplycurrent,rotationperiodisequaltoanintegralmultipleofACsignal

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Vector controlled implementation

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Phasor Diagram

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6Feedback signal processing for vector control

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7Computational equations

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Advantages
VectorcontroloffersmoreprecisecontrolofACmotor
Highperformance
Dynamicresponseisgood
StabilityDisadvantages
Steadystateperformanceispoor
Feedbacksignalprocessingcomplexities

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9Conclusion
Vector control working at unity power factor, fed by voltage source converter
For high performance dynamic applications the most suitable solution is vector control
The wound –field synchronous motor is the only machine capable to operate atunity or leading power factor
In order to obtain improved control performances, the computation of the controlvariables were made
The applied computation procedure of the rotor angular speed, which avoids thedivision by zero, gives accurate results also in computation of the synchronous angular speed

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References
Bimal.K.Bose (2006).Power Electronicsand Drives. Tennessee: Academic Pressis an imprint of Elsevier. 554-557
Csaba SZABÓ, Maria IMECS, Ioan Iov INCZE (2010).SynchronousMotorDriveatMaximumPowerFactorwithDoubleField-Orientation. Romania:Technical Universityof Cluj-Napoca. 17-25

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