DC Link Voltage Control Strategy for Electric Propulsion Aircraft

This paper proposes a DC link voltage control strategy for electric propulsion aircraft (EPA). This control strategy aims to achieve dynamic load management while ensuring the DC voltage stability through an adaptive V-I droop control. The steady-state voltage deviation can be improved through the droop and PI control with the introduction of the real-time current and voltage measurement at the DC link. Stability analysis based on the eigenvalue contours is used to improve the reliability of AC/DC systems for the control parameters used in the proposed control. Besides, the stability region and power boundary for the AC/DC systems are characterized, which provides a safety load curve reference for the power control. These analyses describe the safety operation margin of the proposed control strategy and provide a voltage and power reference to the design of AC/DC systems for aviation application. The simulation demonstrates the effectiveness of the proposed control strategy in terms of response time and the stability of the DC link voltage.