An Active Damping Control Strategy to Enhance the Stability of High Voltage DC Power Supply System for More Electric Aircraft

With the increasing integration of motors and power electronic converters into the electric power system (EPS) of the more electric aircraft (MEA), the proportion of constant power load (CPL) continues to rise. This poses significant challenges to the stability of onboard EPS. In this article, an active damping control strategy is proposed for the high-voltage dc power supply system utilizing a wound rotor synchronous generator. First, the output impedance of the system is derived using small-signal modeling. Based on the impedance criterion, the impacts of CPL power and control parameters on system stability are analyzed. Subsequently, the effects of various active damping positions and configurations are analyzed and compared, with the virtual resistance-capacitance series ultimately selected as the optimal active damping scheme. Finally, the implementation of the active damping control strategy is derived and refined. Experimental results confirm the effectiveness of the proposed method in enhancing system stability.