The increased demand of induction machines in industries motivated the researchers to carry out their research on induction motor (IM) drives with a clear focus to achieve the wide range consistent control of speed and torque, as well as the stable operation of the IM drives. Vector control has become the industrial standard for the IM drive since scalar control being inadequate to provide precise and wide range speed control. Also, the steady-state and dynamic performances of the IM drive employing vector control have been observed better. In this study, intense analysis has been done on the methods available to implement vector control with their features, merits and demerits. Besides, the research trends and current status of researches have also been explored via the taxonomical listing of relevant research literature which, in the author's belief, would guide the researchers working in this area in finding out relevant references for their works.
The control scheme for an electric motor drive is generally implemented by involving proportional‐integral (PI) controllers in current and speed feedback control loops. A good design of PI controller parameters has always been a challenging task for control system design engineers. This paper describes the D‐decomposition method for the design of the parameters of involved DC‐link current and speed PI controllers in closed‐loop scheme of a pulse width‐modulated, current source inverter (CSI)‐fed squirrel‐cage induction motor drive. The PI controllers ensure the stable operation of CSI‐fed induction motor in natural unstable operating region of its torque‐slip characteristic. In order to achieve smoother speed tracking performance with minimum overshoot/undershoot, the damping ratio has been pre‐specified while designing the PI controller parameters using the D‐decomposition method. Simulation results have been presented to confirm the design and have been compared with the results already published.
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