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Back-To-Back Three-Level Converter for Mine Hoist

A simplified space-vector pulse width modulation (SVPWM) algorithm for back-to-back three-level converter is analyzed in this paper. Also, a novel virtual flux control strategy and a hybrid rotor flux observer are proposed in the following. These algorithms are put into used in a back-to-back mine hoist control system for induction motor. The experiment results verified the effectiveness of the algorithms and good dynamic and static performance under the proposed control strategy in field.