The Cooperative Modeling of Wide-area Protection Multi-agent Based on Organization

The wide-area backup protection algorithms based on multi-agent have been developed during recent years. Based on these known algorithms, the cooperative modeling and design mechanism of multi-agent is studied to construct novel protection system in this paper. The abstract concept and principle of the agent are embodied; organization-based collaboration of multi- agent is proposed to improve the protection system´s intelligence and abilities of eliminating the misoperation and reject of protection. Some design mechanisms of the agent are given for the wide-area backup protection, such as agent´s internal three- layer structure, functional modules, equal organizational structure, the negotiation protocol, and three fault-tolerance measures. The state diagram and collaboration diagram are adapted to analyze interaction behaviors among agents. An example is given to explain the negotiation procedure while all protection operations in an agent are failing. Another example explains how multiple agents cooperate to find and lock the misoperation of III line protection made by transmission line overload. These examples illustrate the reasonableness of the design mechanism of the agent.