Wireless parallel operation of high voltage DC power supply using steady-state estimation

This paper presents an improved droop method, which minimizes the voltage droop of a parallel-connected power supply. Conventionally, the droop method has been used to achieve a simple structure and no-interconnections among power sources. However, it has a trade-off between output voltage regulation and load sharing accuracy. In this paper, the droop is minimized with a current and droop gain control using steady-state estimation. The proposed method can achieve both good voltage regulation and good load sharing. A design example of two 10 kV, 100 mA parallel modules are made and tested to verify the proposed current sharing method.