Finite-Set Model Predictive Current-Control in Field Weakening Region for Linear Induction Machines

Abstract

The main purpose for the execution of this strategy is to control the linear induction machines (LIMs) over the rated linear speed. This is developed by one field weakening by finite-set model predictive current control (FW-FSMPCC). The reference values of Id and Iq are continuously adapted as a function to control the speed. This enhances the drive capability where the machine can work under both rated speed and over rated speed. The maximum current and voltage are taken into consideration to keep the machine working with safe operation. Only the primary currents are used in the optimized cost function and therefore no weighting factor is needed like the thrust control. The primary current errors would occur in αβ-coordinates, which is estimated by considering the absolute value of subtraction of primary reference current from the predicted primary current. The end-effect phenomenon is also taken under consideration for the design process of the suggested control method and for dynamic model of the LIM. All theoretical analysis has been validated by comprehensive simulation results based on parameters of one arc induction machine with estimated power 3 kW and large radius.