1. The Network Model Management System
By Joel Koepke ERCOT, Network Model Engineer
EMS Users Conference September 23rd – 26th

2. Submission of Model Updates ERCOT as the Registration Authority
AGENDA
About ERCOT
NMMS Overview
ERCOT CIM
Submission of Model Updates
ERCOT as the Registration Authority
EMS Users Conference September 23rd – 26th

3. About ERCOT
Grid covers 75% of Texas’ land and serves 85% of Texas’ load
38,000 miles of +60kV transmission lines
750 miles of 345kV lines added since 1999
70,000 MW of total resources
26,000MW of generation added since 1998
63,056 MW peak load (8/17/2006)
5400 Bus Model
ERCOT
EMS Users Conference September 23rd – 26th

4. Market Redesign – Going Nodal!
Zonal Market
Insufficient price transparency
Resources grouped by portfolio
Indirect assignment of local congestion
5 CMZ Zones
Nodal Market
Improved price signals
Improved dispatch efficiencies
Direct assignment of local congestion
4000 Nodes
EMS Users Conference September 23rd – 26th

5. The Network Model Management System

6. The Network Model Management System
NMMS
The Network Model Management System
What is it?
The system that will perform all modeling functions in the Nodal market.
Submission of modeling changes
Storage and validation of the model data (Operations and Planning)
Creation of all required models for downstream applications
Why?
The Nodal Protocols contain requirements which significantly change ERCOT’s current modeling process
Need “Future” models
Modeling should be consistent (Operations vs. Planning)
Must accept CIM inputs and produce CIM outputs
EMS Users Conference September 23rd – 26th

7. NMMS - Overview
EMS Users Conference September 23rd – 26th

8. Time-Based Modeling NMMS - Key Features
Incremental Changes – All model updates are stored as a packet of database modification commands
Effective Date – Each incremental change is given an energization date
Future Models – Applying dated incremental changes to a base model creates a model representing a future date
EMS Users Conference September 23rd – 26th

9. Time Based Modeling Example – Part 1
A time based model as it appears on February 15th.
Wanted: A set of models that represent April 1st through April 30th.
EMS Users Conference September 23rd – 26th

10. Time Based Modeling Example – Part 2
First, build a base model representing April 1st.
Second, gather all incremental changes during the desired date range.
EMS Users Conference September 23rd – 26th

11. Time Based Modeling Example – Part 3
EMS Users Conference September 23rd – 26th

12. Future Model Creation NMMS Creating an Operations Model
The model is created by applying all the incremental changes that occur between the current and future dates to the base model
Creating a Planning Model
An Operational model is created for the future date
This model is passed through a “topology processor” to change the breaker/switch model into a bus/branch Planning model
Planning incremental changes are then applied to the model to make it reflect the future date
Consistent Data – Converting an Operational model guarantees consistency
EMS Users Conference September 23rd – 26th

13. Common Information Model (CIM)
NMMS
Common Information Model (CIM)
What is it?
An information model that describes real-world objects and their interrelations within the electric power industry
A format for exchanging information
Why is it important?
Provides a standard way of depicting data
Enables the integration of multiple applications and vendors
Facilitates bulk and incremental model exchange
EMS Users Conference September 23rd – 26th

14. NMMS – Detailed Overview
EMS Users Conference September 23rd – 26th

15. Questions?
EMS Users Conference September 23rd – 26th