COMPARISON OF VECTOR CONTROL OF INDUCTION MOTOR DRIVE USING CONVENTIONAL METHOD AND LOOK ?UP TABLES WITH 6- AND 24- SECTORS

摘要

The control and estimation of induction motor drives constitute a vast subject and these IM drives have been the work horses in the industries for variable speed applications from fractional horse power to multi Mega-watt power. Nowadays, vector control and direct torque control (DTC) are popular for high performance drives. Even though these methods give better performance, the vector control method needs reference frame transformations and direct torque control gives large steady state ripples. To overcome these problems in the above methods mentioned, this paper presents an advanced vector control method for voltage-source inverter fed induction motors using sophisticated look-up tables. The proposed method combines features of both indirect vector control and DTC. This method uses a predetermined look-up table instead of a much more time consuming pulse width modulation (PWM) procedure in conventional vector control for generating inverter gate signals. This approach gives faster torque response like in vector control methods and it also reduces ripples as in DTC method. To validate the proposed method numerical simulations have been carried out and compared with the existing algorithms. The simulation results confirm the effectiveness of the proposed method.