An IEC 61850 Based Communication Model of Wide-Area Relay Protection

At present,the model for wide-area relay protection is not yet described in IEC 61850 standards.For this reason,the paper takes the structure of concentrated wide-area relay protection system as research object,and according to the layer-on-layer modeling method of IEC 61850 standards,the paper presents generalized IED modeling procedures about wide-area relay protection system.Secondly,the paper takes the digital 220kV substation and the algorithm of wide-area relay protection based on fault voltage distribution for examples,master station's and slave stations' tree structure of wide-area relay protection and the interactive process model of message flow between master station and slave stations are given following the principles of IEC 61850 standards.Finally,the paper establishes communication service models,including the clients and server transmission model,the analog values transmission model,and the switching values transmission model.The essential purpose of constructing such communication model is to achieve the interoperability between the IEDs of wide-area relay protection system and other IEDs in digital substations.