Impedance Analysis of Supercapacitor DC-DC Converter in Two-Cascade System

The supercapacitor can form a double cascade system with other converters. When the scheme of the other party that constitutes the cascading system with itself is unknown, it must be able to meet the cascading stability requirements. In order to achieve the corresponding stability, the input and output impedance of the supercapacitor DC-DC converter under two types of cascade conditions are analyzed, the influence of different control parameters on the impedance is analyzed, and the design rules related to the cascade stability are proposed. Due to the influence of magnetic core saturation, the filter inductance changes and the circuit parameters change, so the variable parameter control scheme is adopted for the ultracapacitor DC-DC converter to meet the control needs. After the corresponding analysis, simulation is carried out and experimental results are given to prove the correctness of the analysis.