Abstract This paper presents an AC/DC/AC converter which consists of a three‐phase switch‐mode rectifier (SMR) and a three‐phase multilevel inverter with separate isolated DC power supplies. Based on a hysteresis current control scheme in the stationary reference frame, the three‐phase SMR is controlled to supply sinusoidal currents with high power factor and low current distortion. The separate DC bus voltages are provided by regulated switch‐mode DC/DC converters. The series connection of H‐bridge cells is adopted to provide multilevel phase voltage. The control scheme of the three‐phase multilevel inverter is based on a look‐up table with sine‐triangular pulse‐width‐modulation (PWM) method. The voltage unbalance problem between the separate isolated DC bus voltages is improved by using the proposed control scheme. The proposed control algorithm of the AC/DC/AC converter is verified by simulation and experimental results.
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