Voltage trajectory control for vector-controlled induction motor drives to achieve six-step operation

This paper proposes a new voltage trajectory control for vector-controlled induction motor drives to achieve six-step operation in order to fully utilize the DC-link voltage. Based upon vector-controlled method, additional blocks for the presented method include field weakening control block and voltage command boost block. The special features for the proposed method include: not requiring look-up-table, reducing parameter sensitivity, and no need to freeze the current controllers and over boost voltage command. Moreover, the voltage moves along the hexagon trajectory of space vector of voltage and even achieves six-step operation such that the DC-link voltage can be fully utilized. Experimental and simulation results will be presented to fully support the claims.