Research Proposes Coordinated Method to Speed Self-Healing After Distribution Network Faults

A research paper published June 3, 2026, describes a fast self-healing control method for tie-line faults in regional distribution networks that relies on coordinated interaction among distributed generation, loads, and energy storage. The method addresses islanding risks, complex topology, and limited coordination between traditional protection and stability controls under high distributed-generation penetration.

It establishes a full-process framework covering fault isolation, island detection, stable control, and grid reconnection, supported by a master-slave architecture for multi-level information sharing.

An island detection technique based on a pruning-optimized search strategy removes unnecessary low-voltage branches to improve real-time performance. A circuit-breaker position fault-tolerant mechanism uses enumeration and current criteria to maintain robustness when switch status data are incomplete or incorrect.

Island stability control follows a regulation-priority principle that first adjusts distributed resources such as energy storage and photovoltaics before resorting to load shedding. Simulation and field tests showed recovery time reduced by more than 50 percent, frequency deviation limited to 0.15 Hz, and load loss decreased to 12 percent compared with conventional load-shedding approaches.

The work was supported by the SME Innovation Capability Improvement Program under Grant No. 2024TSGC0987 and the Key Research and Development Program of Shandong Province under Grant No. 2025CXGC010211.