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Static Synchronous Generator model for investigating dynamic behaviors and stability issues of grid-tied inverters

By modeling the typical electromechanical transient of grid-tied PWM inverters, this paper firstly proves that PWM inverters and Rotational Synchronous Generators (RSGs) are similar in physical mechanism and equivalent in mathematical model, and the concept of Static Synchronous Generator (SSG) is thereby developed. Furthermore, the rationality and feasibility of migrating the concepts, tools and methods of RSG stability analysis to investigate the dynamic behaviors and stability issues of SSG is therefore confirmed. The criteria of small signal and transient stability of a grid-tied PWM inverter is put forward, providing clear physical interpretation about the dynamic characteristics and stability issues.