This paper proposes a new circuit of AC/DCPWM converter by adding a diode rectifier to control threephase AC/DC PWM converter under full load stably. Also, wiring method of LCL filter according to the connecting type of low-frequency transformer is proposed to solve the problem of floating state occurring from the circuit in case of considering the low-frequency transformer. Most of the DC loads have electrically sensitive properties to the input voltage. Therefore, in this system, in order to minimize the overshoot of DC link that may occur when power conversion device is connected with load, control should be started in the state of connection with DC load. However, since the constant current flows continuously into switches of AC/DC PWM converter and load, boost is practically impossible due to the saturation of the boost inductors.In this paper, the proposed techniques let power converter control the DC link while power converter maintains stable condition under full load. The proposed circuit is applied to 50kW DC distribution system and this paper verifies the feasibility of the proposed method through simulations.
This paper proposes that each converter supplies the power using the proposed droop control for the parallel operation of the converters. The proposed method is easy to increase the power as parallel system in DC distribution. By improving conventional droop-control method used in AC grid newly, a droop controller is designed to apply droop control in DC grid. And the control method of the proposed droop controller is explained particularly. In this paper, by applying the proposed control method to DC distribution system, propriety is verified through the simulation and the experiment.
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