IEC 61970-552:2013

Overview

IEC 61970-552:2013 is an international standard published by the International Electrotechnical Commission (IEC) that defines the CIMXML Model exchange format as part of the Energy Management System Application Program Interface (EMS-API). This standard specifies the format and rules for exchanging power system modelling data based on the Common Information Model (CIM).

Specifically, IEC 61970-552 builds on the CIM RDF Schema framework outlined in IEC 61970-501 by providing a standardized XML document format-called CIMXML-to facilitate the exchange of power system models among software applications from diverse suppliers. It enables interoperability by harmonizing how complex electrical network data is structured, identified, and shared electronically.

Key Topics

• CIMXML Format Definition: The standard details a Component Interface Specification (CIS) for constructing XML documents representing power system modelling data. It combines CIM concepts with RDF/XML and XML technologies for a structured, machine-readable, and self-describing data format.

• Object Identification: Uses Uniform Resource Identifiers (URIs) and RDF identifiers to uniquely identify power system components and their representations within XML documents, ensuring consistent referencing.

• Exchange Workflow: Specifies model exchange workflows using CIMXML files, supporting the processes of creating, modifying, deleting, and consuming power system models between EMS applications.

• Format Rules and Conventions: Includes simplified RDF syntax, styling guidelines for CIMXML documents, and mechanisms to represent changes in modelling data. This ensures robust handling of model versioning and extensions.

• Use of World Wide Web Consortium Standards: Utilizes foundational W3C recommendations such as XML 1.0, RDF/XML syntax, XSL Transformations (XSLT), and the Document Object Model (DOM), facilitating wide compatibility with existing XML tooling.

Applications

• Inter-vendor Data Exchange: IEC 61970-552 enables seamless sharing of power system models between software products developed by different vendors, supporting the integration of Energy Management Systems and other utility applications.

• Power System Security Coordination: Primarily applied to exchanging transmission network modelling information necessary for security analysis, planning, and coordinated operations in electric utilities.

• EMS Data Interoperability: Facilitates consistent data representation and communication between EMS components and other utility systems, supporting operational efficiency and accuracy.

• Machine and Human Readability: Although designed for programmatic access, CIMXML documents are also human-readable, aiding utility engineers and developers in understanding and validating exchanged data.

• Supporting CIM Profiles: Integrates with related CIM profiles (e.g., IEC 61970-452) to address specific modelling requirements such as transmission network exchanges, allowing tailored and efficient data handling.

Related Standards

• IEC 61970-501: Defines the CIM Resource Description Framework (RDF) schema, providing the meta-model foundation for CIMXML documents.

• IEC 61970-301: Outlines the Common Information Model (CIM) base as a logical, object-oriented data model for electric power systems.

• IEC 61970-452: Specifies CIM profiles for transmission network model exchange, contextualizing the data subsets typically shared using CIMXML.

• IEC 61970-2: Provides terminology and glossary for Energy Management System Application Program Interfaces (EMS-API).

• W3C Standards: Including XML 1.0, RDF/XML Syntax Specification, XSLT, and DOM, which underpin the data format and processing capabilities for CIMXML.

Practical Value

IEC 61970-552:2013 offers utility operators and EMS developers a standardized method to exchange detailed power system models reliably and accurately. This standard supports improved interoperability, reduces integration costs, and enhances data quality management across diverse EMS software implementations. By leveraging a common exchange format grounded in CIM and W3C technologies, IEC 61970-552 promotes global harmonization of energy management system data exchange practices.

Keywords: IEC 61970-552, EMS-API, CIMXML, Common Information Model, power system modelling, XML format, energy management system, model exchange, RDF schema, interoperability, transmission network, EMS data integration, IEC standards, power system security coordination.