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Induction motor current controller for Field Oriented Control using Individual Channel Design

A control strategy for the design of an induction motor stator-current controller is presented. The strategy is based on a controller, which is linear, diagonal, low order, stable, minimum-phase and time-invariant. Moreover, high frequency modes are avoided. It is shown that the design of high performance multivariable controllers, with such characteristics, can be obtained under the framework known as individual channel analysis and design. The multivariable structure function plays a crucial role under this framework. It is thanks to this function that it is possible to conclude that the dynamical system structure is not affected by the rotor speed or typical parameters variations. Therefore, it is possible to achieve uniform performance for the whole speed range of the motor with a fixed linear controller. In addition a proportional indirect field oriented control speed controller is implemented. The control scheme has been proven with real time experiments, showing that the solution proposed is well suited for engineering applications thanks to its simplicity, robustness and excellent performance.