Optimized Efficiency Predictive Controller for Induction Motor Drives in Electric Ships

The paper introduces an adaptive predictive controller for induction motor drives adequate for reduction of thruster start-ups power quality problems and efficiency improvement in electric ships. The algorithm calculates the optimal level of rotor flux that minimize the stator and rotor losses and calculates a voltage vector that drive the motor to the desired rotor speed set point. Independent control of the torque producing current is also introduced and limits the maximum electromagnetic torque. Special mention is made for the implementation of the algorithm in modern day microprocessors. The results are validated through laboratory measurements and compared with the simulated calculations.