Sensorless Model Predictive Force Control with a Novel Weight Coefficients for 3-Phase 4-Switch Inverter Fed Linear Induction Motor Drives

The sensorless model predictive force control (SMPFC) is a strong method for controlling the drives of three-phase 4(6)-switch inverter linear induction motors. This kind of inverter can be employed for the fault tolerant control in order to solve the problem of open/short circuit in the 6-switch inverters (B6). This paper propose a method for the SMPFC of a linear induction motor (LIM) fed by a 4-switch inverter fed along with DC-link voltage offset reduction. Simulations have been performed on several different LIMs in MATLAB software to determine the weight coefficients of stator flux and reduction of the capacitor voltage offset. Then, a relationship has been proposed for determining the weight coefficients in the cost function of the SMPFC. By using weight coefficients in the cost function, the B4 inverter voltage vectors are obtained for exact prediction. The balance of currents is improved by determining the appropriate value for the weight coefficient of the capacitor voltage offset reduction. Simulation results are provided for validation of the suggested control method.