A fault current limiting control scheme for sectionalized connection mode based on dynamic topology adjustment

Abstract

With the rapid development of the power grid， the overhigh short-circuit current becomes increasingly prominent， restricting the safe and stable power grid operation. Because of the shortcomings of the existing short-circuit current limiting methods， fast topology splitting and self-recovery current limiting scheme based on dynamic topology adjustment method in sectionalized connection mode is proposed. To meet the quickness of fault current limiting control system requirement， a control system architecture scheme based on FT3 communication is designed to increase data processing speed and reduce link transmission delay. A fast fault identification and phase control fault interruption method and its implementation scheme based on Kalman state estimation are proposed. Finally， the control system is verified by RTDS test. The results show that the short-circuit current limiting control scheme can quickly extract fault features and complete the splitting in the first cycle of short-circuit current to ensure the effectiveness of current limiting before conventional circuit breaker arcing.

Keywords

• sectionalized connection
• topology splitting
• self-recovery
• quickness
• phase control interruption
• rtds test