Flying-capacitor converters is a multilevel topology which provide several advantagesover classic two level converters. They reduce a dv/dt phenomena and offer a better harmoniccontent. On the other, thanks to the series connection of commutation cells, they provide ameans of increasing power and voltage. Furthermore, for certain failures, their structure can bereconfigured in order to work in degraded mode. However, all these advantages come at the priceof a more complex control since it is necessary to maintain the flying capacitors voltages at theirtarget operating levels. To overcome this problem and motivated by an industrial application incollaboration with GS Maintenance company, a direct control strategy is proposed for a three-phase eight-level flying capacitor inverter. It is showed that the control strategy is simpler thanother control algorithms proposed in the literature, like for example Pulse Width Modulation(PWM) control, and leads less expensive hardware implementations. Moreover its stability isproved by means of Lyapunov theory. This approach is compared to the conventional PWMcontrol to show its good performances during disturbances through simulation results.