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

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 2 September 23rd – 26th

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 3 September 23rd – 26th

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 4 September 23rd – 26th

The Network Model Management System

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 6 September 23rd – 26th

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

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 8 September 23rd – 26th

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 9 September 23rd – 26th

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 10 September 23rd – 26th

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

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 12 September 23rd – 26th

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 13 September 23rd – 26th

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

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