Improved Dynamic Performance and reduced THD on input side of Three-phase Induction Motor using Synchronous Current Control

In this paper Indirect Vector Control of Three phase Induction Motor is implemented and its Dynamic Performance is compared using two different controllers namely Hysteresis Current Control and Synchronous Current Control. In any machine drive system, current control directly influences both flux and torque developed. In Hysteresis Current Control method the actual current is forced to track the desired reference current. This task is easy at low speeds (CEMF is low). At higher speeds, (CEMF is high) due to saturation of current controller, it becomes difficult to track the command current, which results in phase lag with respect to command current. As a result non-optimum harmonic ripple is generated in machine current. Fundamental current also suffers a phase lag which increase at higher frequencies. This phase deviation causes problems in high performance machine control. To solve this problem Synchronous Current Control is proposed. Both Hysteresis Current Control and Synchronous Current Control of Three-phase Induction Motor is simulated in MATLAB/SIMULINK.