Generalized stability criterion of multi-module distributed system

In this paper, the stability issues of multi-module distributed power system without interaction in control loop have been studied. Physical understanding of terminal characteristics of each module is focused. All the modules are divided into two groups based on the different terminal property type. Equivalent circuits of each group are established to analyze the stability issue. Then, mathematical equations of equivalent circuit are derived. Following the idea of stability criterion exists in cascade system, a generalized criterion for multi-module distributed system is proposed. It's clear that the proposed criterion is independent of the power flow direction.