A control scheme for the single-phase three-level rectifier with high power factor and low total harmonic distortion of the line current is proposed. A hysteresis current comparator is used to control the line current following the line current command. The advantages of the proposed control scheme for a three-level rectifier are (1) low blocking voltage of each power device; (2) low harmonic content; and (3) high power factor. The control scheme is based on the region detector of the rectified line voltage, capacitor compensator and hysteresis current comparator. Experimental results from a laboratory prototype show that the proposed scheme gives good steady-state performance of the three-level rectifier which coincides with the theoretical results.
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