MICROGRID DELAY MARGIN CALCULATION METHOD BASED ON CRITICAL CHARACTERISTIC ROOT TRACKING

摘要

A microgrid delay margin calculation method based on critical characteristic root tracking, belonging to the technical field of operation control. The method comprises: establishing, on the basis of a static output feedback, a microgrid closed-loop small-signal model including a voltage feedback control amount containing communication delay, so as to acquire a characteristic equation including a transcendental member, performing critical characteristic root locus tracing on the transcendental member in the system characteristic equation, searching for a possible pure virtual characteristic root, and further calculating the maximum delay time for stabilizing the microgrid. The method studies the relationship between a controller parameter and a delay margin, thereby guiding the design of the control parameter, effectively improving the stability and dynamic performance of the microgrid.