The VoltsHertzController component represents the controller logic for the variable speed drive. The volts hertz control is a simple and widely used method for controlling the speed of an AC induction motor by adjusting the voltage and frequency supplied to the motor at a constant ratio.
The model has three inputs and two output connectors. The W_ref input connector represents the reference synchronous speed that is user defined, motor_speed input is the motor speed that is generated by the motor model, and the Vc input is the capacitor voltage value from the AC2DCandDC2AC component. The m output is the PWM modulation index, and the we output is the synchronous speed that is used in the controllable motor model.
The modelling of such devices is based, mainly, on the following reference: