Comprehensive study about stability issues of multi-module distributed system

When the stability issues of multi-module distributed DC power system are analyzed, the physical understandings of terminal characteristics of each module should be focused. According to the proposed analysis method, all the sub-modules are divided into two groups based on the different terminal property types: impedance (Z) type and admittance (Y) type. Equivalent circuits of total system are established to analyze the stability issues and mathematical equations of equivalent circuit are derived. Based on the mathematical equations, two generalized stability criteria for multi-module distributed system have been proposed. In this paper, comparisons between the two stability criteria are made and comprehensive study about stability issues in multi-module system is made through the comparison.