Wide-Area Protection Fault Identification Algorithm Based on Multi-Information Fusion

Wide-area protection systems can be used to avoid complicated setting coordination of traditional backup relays and effectively prevent cascading trip events. Since they depend on a multisource data of transmission network to identify a faulted element, fault-tolerance capacity of the system is required. This paper proposes a faulted element identification algorithm based on multisource information fusion for wide-area protection. A fault identification encoding method based upon grid topology is presented. Meanwhile, the operation information of traditional primary/backup relays and the status of breakers are utilized to establish fitness function and state expectation function. The fitness of protected elements is used to determine their fault probability; and faulted elements are identified with high fault tolerance. The property of the presented algorithm is validated by simulation tests based on an IEEE 10-generator 39-bus system.