1. CIM in a Triple-Store Database for Distribution Power Flow
Thomas E. McDermott, Ph.D., PE, FIEEE
Chief Engineer, Integration Team, Electricity Infrastructure
Pacific Northwest National Laboratory
November 9, 2017

2. GridAPPS-D runs on Ubuntu; release cycles end(ed) April 2017, October 2017, April 2018.
November 9, 2017

3. GridAPPS-D is an application development platform built around standards like IEC 61968.
Low-TRL Sample Applications
Volt-var optimization
Transactive control
State estimation (2)
Model validation
DER optimization (2)
Load forecasting
Fault recovery
Cyber traffic monitor
November 9, 2017

4. CIM supports model translation between GridLAB-D, OpenDSS, DMS vendors, CYME, etc.
November 9, 2017

5. Common Information Model (CIM) implemented in a triple-store DB for power flow.
Writes GridLAB-D model and labels in about 5 seconds over HTTP
Imports 329,327 triples in seconds
Queries match the CIM; implemented in SPARQL and Java w/ Jena
Outperforms the Relational DBMS (MySQL) version from April 2017
Problem: GridLAB-D and OpenDSS both need nominal voltage for loads, which is not in EnergyConsumer.
November 9, 2017

6. Blazegraph installation and configuration is relatively simple.
Download the jar from
On Windows only, patch the configuration:
Add to rwstore.properties com.bigdata.rwstore.RWStore.readBlobsAsync=false
jar uf blazegraph.jar RWStore.properties
java -server -Xmx4g -Dfile.encoding=UTF-8 -jar blazegraph.jar
Point browser to
Load some data from CIM XML file
Run a query in the browser
November 9, 2017

7. Single-phase, center-tapped secondary transformers serve most house loads in the U.S.
November 9, 2017

8. We use tank modeling, asset info and connectivity nodes.
November 9, 2017

9. Cataloging the transformer winding ratings.
Note: the ordering of triples is alphabetical here to minimize the arrow crossings; this order is not necessarily optimal.
November 9, 2017

10. No-load tests for catalog entries.
November 9, 2017

11. Short-circuit tests for catalog; match both ends.
November 9, 2017

12. Connecting the transformer to catalog data, phases, and connectivity nodes.
endNumber to match catalog
November 9, 2017

13. Using the Measurement Package for State Estimation, and State Variables for calculations.
Added SvSwitch
Current to SvPowerFlow
ComplexValue?
November 9, 2017

14. Mimicking the Outage Management System (OMS) with CIM trouble tickets linked to state estimator.
November 9, 2017

15. Need CIM extensions for building models beyond constant impedance, current or power (ZIP).
Also see:
November 9, 2017

16. References GridAPPS-D: http://gridappsd.readthedocs.io/en/latest/
Blazegraph:
OpenDSS:
Dugan, McDermott, “An open source platform for collaborating on smart grid research”, 2011 IEEE PES GM
GridLAB-D:
Chassin, Fuller, Djilali, “GridLAB-D: An agent-based simulation framework for smart grids”, Journal of Applied Math, 2014
IEEE Test Feeders:
Schneider et. al., “Analytic Considerations and Design Basis for the IEEE Distribution Test Feeders”, IEEE-TPWRS (accepted)
Schneider, Chen, Engle, Chassin, “A Taxonomy of North American radial distribution feeders”, 2009 IEEE PES GM
McDermott, Stephan, Gibson, “Alternative Database Designs for the Distribution Common Information Model”, 2018 IEEE T&D (accepted)
November 9, 2017