This circuit uses the AC4 block of SimPowerSystems™ library. It models a direct torque control (DTC) induction motor drive with a braking chopper for a 200HP AC motor.
The induction motor is fed by a PWM voltage source inverter which is built using a Universal Bridge Block. The speed control loop uses a proportional-integral controller to produce the flux and torque references for the DTC block. The DTC block computes the motor torque and flux estimates and compares them to their respective reference. The comparators outputs are then used by an optimal switching table which generates the inverter switching pulses.
Motor current, speed, and torque signals are available at the output of the block.