Hidden Failure Detection in Protection System via Centralized Substation Protection
Protection reliability (dependability and security) is jeopardized by two issues: (a) hidden or direct failures of legacy as well as modern protection systems and (b) protective relaying mis-operations due mainly to coordination gaps in present day complex protection and control systems. Therefore, continuous monitoring of protection and control system health and improved “self-healing” protection methods which eliminate relay mis-operations are desirable. We present a new dynamic state estimation-based centralized protection scheme (DSEBCPS) at a substation level that addresses these needs. The system integrates dynamic state estimation-based relays (a.k.a. “setting-less relays”) with a substation-wide monitoring system that detects hidden failures and self-corrects compromised data. The approach results in a self-healing P&C system. The method has been tested via numerical experiments with hardware-in-the-loop and establishes a new paradigm of asset management for protection and control systems.