Group Name: REQSource: Linyi Tian, Huawei, tianlinyi@huawei.comMeeting Date: Feb 18, Agenda Item:

METADATA IN SMART GRID

Outline

• Metadata in electricity industry: – Provide the overview of metadata & semantics in

IEC 61970 for Smart Grid– It contains examples which may be related to

M2M area

• Potential oneM2M Requirements

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IEC 61970 in a NutshellIEC 61970•The integration of applications developed by different suppliers in the control center environment•The exchange of information to systems external to the control center environment (transmission, distribution and generation systems);

The CIM (Common Information Model) :•Maintained as a UML model.•Defines a common vocabulary and basic ontology for the electric power industry. •Central package 'wires model' describes the components used to transport electricity. •Derive 'design artifacts' (e.g. XML Schema, RDF Schema) as needed for the integration of related application software.•IEC 61970-301 defines the data model packages•IEC 61970-501 and 61970-452 define an XML format for network model exchanges using RDF. •IEC 61968 series of standards extend the CIM to meet the needs of electrical distribution, where related applications include distribution management system, outage management system, planning, metering, work management, geographic information system, asset management, customer information systems and enterprise resource planning.

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CIM Model and Data Access

61970 404: High Speed Data Access (HSDA) High Level Data Model

Data Objects that can be accessed

Types can be IEC 61970-301 Measurement, Breaker, Substation, etc.

Properties can be IEC 61970-301 Measurement.normalValue=50Breaker.ampRating=60, etc.

Pathname: unique name in the system. Layout of the pathname is implementation specific. Xpath is recommended to be used.It is possible to use RESTful approach to access these data in the future with mapping to XPath.

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Example: Measurement Class

Power System Resource (PSR) may have zero to many measurements:

Semantics defined by 61970-301

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Graphics Object Data Model

61970 453: Graphics exchange CIM based graphics exchange has been designed with the use of SVG in mind.

The graphics data may be exchanged between substation automation system, control center, planning system and GIS system.

Object SVG

CgoDiagram SVG element

CgoGraphicalObject SVG basic shape or SVG symbol

CgoGroup SVG group element

CgoLayer Metadata of SVG element

CgoDiagramView Metadata of SVG element

CgoMetaData SVG metadata element

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Graphics Object Data Model

References to the presentation logic will be transferred. The local presentation logic should be negotiated between the sending and receiving system in advance.

The graphics medata will be associated with the domain data defined in 61970-301.

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Proposals

Recommendation:Study the metadata from the electricity industry to see whether they are relevant to M2M work area.

Potential requirements:•The M2M system shall provide a common abstraction mechanism for various data models.•The M2M system shall provide a mechanism to map the abstraction data model to physical data models.•The M2M system shall provide a mechanism to allow graphical data exchange.