PERFORMANCE INVESTIGATION OF VECTOR CONTROLLED INDUCTION MOTOR DRIVE

Abstract

Electrical Drives today have become an important part of the modern industry. The motor drives are used in very wide power range. In various applications where speed and position control is of great significance, the drives are controlled via a power electronic converter, an interface between the input power and the motor. Vector Control is becoming the industrial standards for induction motor control. The vector control technique decouples the two components of stator current: one providing the control of flux and the other providing the control of torque. The flux as well as the torque level of the machine is controlled with perpendicular components of the stator current vector in the synchronously rotating reference frame (SRRF). Thus a current control loop is usually realized which controls the stator current and calculates the necessary inverter switching states. Power consumption of the drive and the harmonics that it injects in the supply plays an important role in the overall performance of the drive. As VCIMD load degrades thw quality of the supply line power, it is imortant to invastigate the power quality improvement techniques on the supply side of the line. The use of multipulse AC-DC converter is such a method and its use for harmonic mitigation is not costly and energy efficient. Deduction of harmonics in supply current and improve DC output as the DC link can be achieved by using these converter. Use of multipulse convertrs in various topologies, their investigation can tells us the best suitable one for a given purpose