Grid4EU present at CIM Users Group in Slovenia
Ljubljana, June 12th
The CIM Users Group (CIMug) is a subgroup of the UCA International Users Group which provides a forum for IEC CIM users across the utility enterprise. The primary purpose is to share best practices and technical information on the CIM usage across utility Information System.
The Common Information Model (CIM) is an abstract information model for data exchanges within a utility Information System. This enhanced data understanding increases the ability to integrate applications both within the enterprise and with trading partners.
The last CIM User Group occurred in Ljubjana, from June 11th to June 14th. As usual, the first day was dedicated to a special session called “CIM University”, a pre-meeting tutorial about the CIM. During the second day, the sessions present some utility project stories , IOPs and testing programs and research and development activities around the CIM. And the third day, standardization activities of ENTSOE, IEC TC57 and IEEE were presented. After each presentation session, a vendor session was organized for CIM products demonstrations.
Grid4EU presented the activities of the GWP4 “Technology & Communication standards in the Grid4EU project“related to the CIM. After a short presentation of the project organization, the demonstrators involved and their partners, and the different General Work Packages, the presentation focused on the CIM feedbacks from the demonstrators during the first year of work of the GWP4.
These feedbacks highlighted the following aspects of the CIM:
- DER (Distributed Energy Resources) description.
- Production forecast description.
- Data models for metering.
- Network control with CIM & 61850 harmonization.
For DER aspect, 4 of the 6 demonstrators include DER, and 2 of the 6 demonstrators include electric vehicles, which can be see as DER in several use-cases. The GWP4 work outlined the fact the CIM needs improvement for DER description, mainly for PV panels and batteries. DER description is an on-going work of the IEC TC57 (WG14), and some proposals have been done to extend the CIM model for DER, partly by EDF R&D which participates both to WG14 and GRID4EU project.
For production forecast description required by some demonstrators, the CIM proposes basic classes for schedules (RegularIntervalSchedule, RegularTimePoint, Curve,…), but the model is limited by the number of plots (3 per Curve, 2 per Schedule-s). The ADDRESS project (FP7) improved the model to define any number of plots (Axis classes) and made extensions for active demand schedules and flexility (ADSchedule,…). The GWP4 recommends using the ADDRESS extensions for demonstrators needs.
Concerning CIM model for metering, 3 of the 6 demonstrators include metering. Several data models used for metering information exchange.
- DEMO2 : LonWorks (metering system) and CIM (information system).
- DEMO3 : DLMS/COSEM (metering system).
- DEMO6 : DLMS/COSEM (metering system) and CIM (information system).
A flexible and interoperable approach for metering data exchange inside the demonstrators requires a mapping between these data models. Efforts have to focus on the mapping of the OBIS codes (used with COSEM) with CIM ReadingTypes, and on the mapping of the LonWorks network variables (Standard Network Variable Types or SNVTs) with the CIM.
Finally, some demonstrators use standard 61850-7-420 to describe the Logical Nodes associated to Distributed Energy Resources (DER), beside the CIM. The mapping of 61850 logical nodes with CIM classes is also a task to perform. Unification and harmonization between CIM and 61850 is in progress in the TC57 Working Groups.