Modified predictive torque and flux control for open end winding induction motor drive based on ranking method

Abstract

The emerging application of predictive torque and flux control (PTC) in induction motor (IM) drive technology is becoming more successful. The PTC scheme can be applied to open-end winding IM (OEWIM) drive fed by dual inverter owing to its merits: high dynamic performance, simple control by involving regulation parameters into the control law. However, a conventional PTC offers single control law. To achieve controlling of multiple parameters, weighting factors need to be assigned to the respective parameters in the control law. The selection of weighting factors directly affects control performance of OEWIM. For an optimal selection of weighting factors, the empirical method has to be followed, which is time overwhelming and cumbersome process. To overcome this problem, this study introduces multi-objective controlling and optimisation based on the ranking method rather than the minimisation of single control law as in the case of conventional methods. The proposed feature circumvents optimisation of weighting factors. To validate the proposed scheme, simulation using Matlab/Simulink and experimental analysis are performed for dual-inverter fed OEWIM drive. By considering same control objectives (torque, flux ripple and switching frequency limitation), these results are examined with a conventional PTC scheme to accentuate merits of the proposed scheme.