Safe current injection strategies for a STATCOM under asymmetrical grid faults

摘要

This paper explores different strategies to set theudreference current of a STATCOM under unbalanced gridudvoltage conditions and determines the maximum deliverableudreactive power in each case to guarantee the injected current isudpermanently within the STATCOM secure operation limits. Theudpaper presents a comprehensive derivation of the proposedudSTATCOM control strategies to set the reactive currentudreference under unbalanced grid faults, together with anudextensive evaluation using simulation and experimental resultsudfrom a low-scale laboratory setup in order to verify and validateudthe dynamic performance achieved by the proposed reactiveudcurrent limiting algorithms.