Improvement in the Stability of DC Electrical Power Distribution Systems in More Electric Aircraft

The number of power converters that act as constant power loads (CPLs) has increased continuously with the penetration of power electronic technology in more electric aircraft (MEA). The negative impedance of CPLs can drastically degrade overall stability, resulting in system instability and poor output performance. Herein, stabilization gain based on loop cancelation is introduced to stabilize the electrical power system (EPS) of MEA. After applying the proposed stabilization, the MEA EPS can return to a stable state and operate at high-power levels until the rated power is achieved. A robust analysis is also performed to ensure that the MEA system with the proposed stabilization technique remains stable under all operating conditions despite changes in parameters. Moreover, the voltage response of DC buses can adhere to the MIL-STD-704F standard. Intensive time-domain and hardware-in-the-loop simulations are used to verify the effectiveness of the proposed stabilization technique.