Fragility analysis and weak point identification of power system

In order to ensure the stability of the aerospace power system in the harsh working environment and identify the weak point of the system which leads to the bad outcomes and instability of the system, the concept of power circuit fragility is raised in this paper with a thorough analysis of the stability of the aerospace power circuit. The node-index evaluation model is established based on the basic cause of the circuits stability problem. Combined with the description of the actual values of the electronic components using ternary interval number, the mathematical expression of the power supply circuits fragility is given. Taking the Superbuck aerospace power circuit as an example, this paper uses the node-index evaluation model to analyze the fragility of phase margin and overshoot, identifies the weak point of the power circuit and gives the quantization value of the phase margin and overshoot fragilities, which provides the theoretical basis for subsequent maintenance and power supply design.