Un-terminated, low-frequency terminal-behavioral d-q model of three-phase converters

Frequency-domain terminal-behavioral modeling of ac systems is unquestionably attracting more and more interest in engineering practice. New electronic power distribution systems built for airplanes, ships, electric vehicles, data-centers and even homes, dominantly comprise a variety of power electronics converters with very different dynamic characteristics. If their behavior is not examined carefully before system is integrated, instability can become one of the major concerns. This paper addresses low-frequency terminal-behavioral modeling of three-phase converters which dynamics can be captured on-line, in a non-intrusive way, and later decoupled from the source and load in order to get un-terminated model of a particular converter (or a system). A few examples of different converters are given at the end to verify modeling and decoupling procedure with the average and switching models.