Multi-Agent based Control and Protection of Power Distributed System - Protection Scheme with Simplified Information Utilization -

On the premise of future improvement of information infrastructures, we proposed a multi-agent based protection scheme for distribution systems with high penetration of distributed generators (DGs). In the proposed protection scheme, various relays designed as relay agents cooperate to locate and isolate fault zone. Binary state signal, e.g. current direction, magnitude, etc. is determined autonomously just by sensing a sudden change of the current at the relay. Each relay simultaneously utilizes binary state signals provided by the other relays at breakers involved to the same zone for detecting a fault location. By using PSCAD/EMTDC, the proposed protection scheme is tested with a distribution system which has loop structure and is divided into several protection zones. Extensive simulation studies show that the proposed protection scheme can be adopted for various conditions of distribution structure and DGs operation, and may contribute to a selective and quick disconnection of faulted zone with less coordination between relays