Application and Optimization of Reverse Power-Anti-islanding Collaborative Protection system for Mine Self-owned Power Station

Aiming at the dynamic topology of power grid caused by frequent mining and excavation, violent load fluctuations, and high penetration rate of distributed power sources in mine self-owned power station, and the existing problem of protection blind spots in traditional reverse power protection under the complex working conditions of harmonic pollution and power reversal. Through establishing a three-dimensional technical scheme model for independent configuration of reverse power protection, reverse power-optical fiber remote jump interlocking, and reverse power-anti-islanding collaborative operation, a collaborative protection system based on inter-level collaborative logic optimization and multi-criteria fusion algorithm is proposed. This system constructs a layered protection mechanism of "reverse power blocking-islanding state identification-distributed power source interlocking disconnection", shielded cable layered laying and double ended grounding are adopted to suppress interference, two-stage type of protection logic is set up, 90° wiring method and cosine algorithm are integrated to optimize the directional criterion. The results show that the spatial adaptability is significantly improved, and the protection reliability is effectively enhanced, providing an innovative solution for self-owned power stations in high proportion power electronicization mines.