Space vector-based hysteresis current controller with self-monitoring mechanism

This paper presents a robust space vector-based hysteresis current controller (SVBHCC) which does not use the back-emf information directly to produce the optimal pulse width modulation (PWM) switching pattern. The controller operation is based on a generalized reference vector which tracks the fundamental harmonic of the load voltage. This vector is calculated iteratively by monitoring the PWM pattern generated by the current controller itself. The generalized reference vector is a direct replacement for the back-emf vector used by other SVBHCC methods previously published in the literature. The main advantages of this new current control method are simplicity and improved current control quality. Two versions of the new control algorithm are presented and test results are shown for an electrical drive system designed around this type of current controller.