| Power System Blockset | |
Variable-Frequency Induction Motor Drive
This case study presents a variable-frequency AC motor drive in which a pulse width modulated (PWM) inverter is used as a variable-voltage variable-frequency source to drive an induction motor in variable-speed operation.
The drive, including the motor, the power converter, and the speed control system, is modeled by using the Power System Blockset and Simulink blocks. The drive operation is studied for different operating conditions: starting, steady-state, and transients.
The objective of this example is to demonstrate the use of Machine library, and Power Electronics library blocks in combination with Simulink blocks in the simulation of a complex electromechanical system operating at high frequency. The electrical part of the AC motor drive including the PWM inverter is built using the Universal Bridge block. The induction motor is represented by the Asynchronous Machine block, which models both electric and mechanical dynamics. The control system including current and speed regulators is built using Simulink blocks. The interface between electrical and control systems is ensured by blocks of the Measurement library of powersys.
| | Simulation Results | Description of the Induction Motor Drive | |