Abstract
In a modern electrified aircraft, fuel cells, batteries, and supercapacitors are promising power sources to supply the onboard electric loads, such as flight control actuators, avionics, etc. These loads are mainly regulated power converters and motor drive systems, which behave as constant power loads (CPLs) that can significantly affect the system’s stability. The system may become unstable and cannot operate at rated power. This paper proposes a composite controller composed of a passivity-based controller (PBC) and an extended high-gain state observer (EHGSO) for the terminal DC–DC converters of source units of an onboard DC microgrid. The PBC can guarantee system stability in all load types, while the EHGSO can improve control performances by accurately estimating system disturbances, including unmolded dynamics and parameter uncertainties. A test-rig setup, which consists of a CPL fed by two source units through two parallel-connected bidirectional Buck-Boost converters, is developed in the lab. The effectiveness of the proposed composite controller is verified by the experimental results performed by it.
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