Experimental Implementation of PI and Fuzzy based DTC with Performance Analysis

Compared with the Rotor field oriented control, the DTC has many advantages such as less machine parameter dependence, intrinsically speed sensorless, simpler implementation and quicker dynamic torque response, with no need of currents controllers neither a coordinate transforms. But it suffers of current's oscillations, torque ripples and variable switching frequency. In counterpart the FOC presents good dynamic, more stability at steady state, low switching frequency and less currents and torque ripples, but it major drawbacks are; more computation time (needed in Park’s transformation, and decoupling), more sensitive to parametric variations, several controllers loops and requires a speed sensor [4].