A Comparative Analysis of a Novel Stability Criterion Versus the Generalized Nyquist Stability Criterion in More-Electric Aircraft Cascaded System

As the power demands of onboard electrical equipment continue to rise, more-electric aircraft (MEA) power supply systems require an increasing number of converters to provide controlled voltage or frequency power. However, the extensive use of converters and their interaction with generators lead to instability in AC bus voltage, posing potential safety risks to aircraft. Therefore, analyzing the stability of cascaded systems consisting of generators and converters is crucial. This paper proposes a novel stability criterion based on the Gershgorin circle theorem to accurately assess the AC output voltage stability of MEA cascaded systems. Compared to the generalized Nyquist stability criterion (GNSC), the proposed method aligns more closely with the actual stability state of aircraft systems and allows for the pre-design customization of stability margins, providing valuable guidance for aircraft system design. Finally, simulations validate the advantages and accuracy of this method through comparative analysis.