Process Level Architecture And Information Model Expansion Of Smart Substation

Reliable and efficient information exchange over the communication networks, oneprerequisite out of many for the realization of grid fault diagnosis, alarm, real time control,etc., will be of great significance in the future smart grid. Information system in substationplays a critical role in this process. For the information system in the future smartsubstation, one scene is quite desirable and attractive: digital signals with conformativemodel being transimitted timely and reliblely via the Ethernet which covers the wholestation. Today, the network improvement and information standardization are apparentlymore important. This thesis focuses on the process level architecture in smart substation;and the application of information expansion in conformance with the IEC61850isdiscussed.With fully consideration about different senarios for secondary functions’dirstribution and integrateion,3possible schemes are proposed for function allocation.Redundancy protocols, Parallel Redundancy Protocol (PRP) and High-availabilitySeamless Ring (HSR), are investigated. Process level architecture design with differentnetwork topology is conducted with the secondary functions allocation schemes at hand.By comparison of the availability of different architecture designs, coordination rulesbetween the way that functions are allocated and specific topologies are concluded.One reliability evaluation method based on minimal paths searching whileconsidering constraints caused by the network characteristics is proposed in this thesis. Itcan calculate the availability of the process level architecture automatically. However, thismethod involves the exhaustive paths emumeration and algebra calculation, which meansthe time and storage needed will grow exponentially with the growth of network and willmake the assessment impossible for system with large nodes number. Therefore, anothermethod based on the Binary Decision Diagram is developed. Computation results showedthat the time cost of the latter method grows linearly to the network scale and is muchbetter than the former one.Research is conducted on the application of information expansion based on IEC61850. General information modeling method is concluded, and applied to the breakercondition monitoring device. This chapter could be referenced by other related projects.