A NEW METHODOLOGY FOR THE STABILITY ANALYSIS OF LARGE-SCALE POWER ELECTRONICS SYSTEMS

A new methodology is proposed to investigate the large-signal stabilit y of interconnected power electronics systems. The approach consists o f decoupling the system into a source subsystem and a load subsystem, and stability of the entire system can be analyzed based on investigat ing the feedback loop formed by the interconnected source/load system. The proposed methodology requires two stages: 1) since the source and the load are unknown nonlinear subsystems, system identification, whi ch consists of isolating each subsystem into a series combination of a linear part and a nonlinear part, must be performed; and 2) stability analysis of the interconnected system is conducted thereafter based o n a developed stability criterion suitable for the nonlinear interconn ected source-load model. Applicability of the methodology is verified through the stability analysis of a typical power electronics system.