Extension of the Common Information Model with a Catalog of Topologies Proposal for IEC TC57 WG14 PhD. Dragan S. Popović MSc. Ervin Varga

Motivation To raise performance of the system with maximum knowledge about the physics of the problem. To encourage the DMS vendors to use more of CIM based solution in the new generation of DMS software. To get closer to internal CIM compatibility on modular level (efficient interoperability tests).

The CIM connectivity model

The description of a network a) the physical representation b) CIM connectivity model Busbar [BusbarSection] Bay Breaker Disconnector ACLine Segment ConnectivityNode 1 Terminal 2 Terminal 3 Breaker ACLine Segment Terminal 4 ConnectivityNode 2 Terminal 5 Terminal 6 ConnectivityNode 3 Disconnector Terminal 1 a) b) Node 2 Node 3 Node 1

Transition from connectivity to topology Instance of a Composite Switch Instance of a Bay conn. node terminal bay’s basic elements

Catalog of equipment in CIM

A bay as a fundamental idea interconnections of external elements through a bay the bay's inputs/outputs the bay's internal structure Bay External element 1 External element 2 Inputs of a bay Outputs of a bay The matching record in the catalog of bays describes the internal topology of a bay. The bay consists of several pieces of equipment, and their interconnections.

The 2-layer model of the catalog of bays a) the core abstract bay definition b) the non-core core abstract bay definition Disc_1 Disc _2 Current Transf_1 Breaker_ 1 Disc_ a) Line_1 (segment) Busbar_1 Busbar_ The core bay b)

The content of the new Catalog package Naming PowerSystemResourcePSRReference Bay TopologicalIslandTypeTopologicalIsland EquipmentEquipmentContainer +Referenced_By +References_PSR +Contains_References +MemberOf_Bay +Completed_By +Completes_Bay +Defines_Topology_For +Topology_Defined_By +TopologicalIslandType +TopologyIsland +MemberOf_EquipmentContainer +Contains_Equipment +Completes_PSR +Completed_By 0..n n key

Implementation details Excerpt demonstrating the Completes_Bay association: Bay Bay <cim_ext:Bay.Completes_Bay <cim_ext:Bay.Completes_Bay rdf:resource=" rdf:resource=" <cim:Bay.MemberOf_Substation <cim:Bay.MemberOf_Substation rdf:resource="#Substation_359158"/> rdf:resource="#Substation_359158"/></cim:Bay> Sample illustrating the Completes_PSR association: BR BR <cim_ext:PowerSystemResource.Completes_PSR <cim_ext:PowerSystemResource.Completes_PSR rdf:resource=" Breaker_1"/> rdf:resource=" Breaker_1"/></cim:Breaker>

Advantages of the catalog of bays concept a) Standard network model b) “CIM model” with ConnectivityNodes c) Transformation of “CIM model” to bay blocks model d) Transformation of bay blocks model to bus-branch model a)b)c)d)

Test results the histogram showing the CPU times for serializing the networks of Novi Sad and Puebla the histogram showing the topology analysis times for the networks of Novi Sad and Puebla CPU Time [s] Tested networks 15,1 19, Novi SadPuebla CIM model with proposed changes CPU Time [ms] Novi Sad Puebla Tested networks CIM model with proposed changes

Conclusion The size of the CIM/XML document containing exported data about the network is reduced. The speed of processing the topology of the network is also significantly reduced. Accepting the proposal on an international level paves the way for standardizing the catalog of topologies. The data management (input and verification) is enhanced. The checking of allowed switching operations within the bays is lot simpler.

Changes in basic CIM model or the application database Introduction of the catalog of topologies is a natural extension of modeling topology parameters that already exists in CIM. Introducing the catalog of topologies does not impose any limits to general modeling, or violate CIM compatibility, but provides many benefits. Incorporating the catalog of topologies into an application database is useful for all applications, but very time consuming. Therefore, it would be better to apply it in the basic model.