Research on Parallel Control Method for More Electric Aircraft High Voltage DC Electric Power System Considering Line Impedance

In order to address the uneven current distribution caused by the difference of line impedance in parallel electric power system (EPS) and the bus voltage drop in traditional droop control, this paper proposes an improved droop control strategy that considering the line impedance. Firstly, the influence of line impedance on current distribution accuracy is analyzed. Subsequently, the line impedance is taken into account in the droop coefficient to achieve equal current distribution. On this basis, a voltage compensation link is added to compensate for the busbar voltage drop caused by the initial droop coefficient. Finally, to verify the effectiveness of the proposed control strategy, a simulation model of a 3 -stage generator high voltage DC (HVDC) parallel EPS was established, and the simulation results of three control methods are compared. The results show that the control strategy proposed in this paper can improve the defects of traditional control method, while also achieving both bus voltage regulation and average current distribution.