The direct current control method for the DSTATCOM can greatly reduce the over-current risk of the converter， enhance the reliability and safety of the whole equipment， decrease the requested current rate of switch device and increase the performance/price ratio. Hence this paper proposes a three-level ramp comparison control method and the realization of neutral-point voltage control for the DSTATCOM based on transformer-isolated multilevel H-bridges converter. In the paper， the simulation and experiment results demonstrate that the DSTATCOM adopting ramp comparison control method can respond fast to the voltage fluctuation and flickers.