A TECHNICAL SEMINAR

OnVARIABLE FREQUENCY DRIVE

SUBMITTED BY:RADHIKA PRIYADARSHINI

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CONTENTS•INTRODUCTION•VARIABLE FREQUENCY DRIVE(VFD)•TYPES OF VFD•ENERGY SAVING WITH VFD•APLLICATIONS•ADVANTAGES•LIMITATIONS•CONCLUSION•BIBLIOGRAPHY

INTRODUCTIONNEED FOR SPEED CONTROL

HISTORY

DRIVES

ELECTRIC DRIVES

ELECTRIC DRIVE

INPUT COMMAND

VFD OPERATION

VOLTAGE SOURCE INVERTER

VSI CONTROLLED IM DRIVE

CURRENT SOURCE INVERTER

CSI CONTROLLED IM DRIVE

ENERGY SAVING WITH VFD•BEAT PEAK DEMAND CHARGES•POWER FACTOR•REGENERATION•MULTIPLE MOTOR DRIVE

APPLICATIONS•VARIABLE TORQUE•CONSTANT POWER•CONSTANT TORQUE

ADVANTAGES•Soft starting•Precise speed and torque control•High reliability and availability•Low audible noise•Capability of regenerative breaking

•Energy saving

LIMITATIONS•AC drives not reliable as dc drives•Cost of AC drives are more•Presence of harmonics may heat the motor •Separate filter circuits may be required to reduce harmonics

CONCLUSION•PRECISE PROCESS CONTROL AND WIDE SPEED RANGE•GOOD RUNNING AND TRANSIENT PERFORMANCES•SIMPLE,ENERGY EFFICIENT, ENERGY SAVING, REDUCED NOISE LEVEL, SOFT START AND STOPPING•APPLICATION

BIBLIOGRAPHY•Gopal k.Dubey, Fundamentals of electrical drives, , Narosa Publishing house, II edition•Bimal K Bose, Modern power electronics and AC drives• M. H Rashid , Power electronics, Pearson India, II edition•Bimal K Bose, The past, present and future of Power Electronics, IEEE industrial magazine vol.3•Marcel Dekker ,Solid state AC motor controls, ,New York•Carrier drive technology Syracus, Variable frequency drive technology, New York•www.wikipedia.org•nptel.iitk.ac.in•www.ab.com

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