EMS Users Conference 1 September 23rd – 26th

The Network Model

Management System

By Joel KoepkeERCOT, Network Model Engineer

EMS Users Conference 2 September 23rd – 26th

AGENDA

• About ERCOT

• NMMS Overview

• ERCOT CIM

• Submission of Model Updates

• ERCOT as the Registration Authority

EMS Users Conference 3 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 4 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

The Network Model Management System

EMS Users Conference 6 September 23rd – 26th

NMMS

• 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

The Network Model Management System

EMS Users Conference 7 September 23rd – 26th

NMMS - Overview

EMS Users Conference 8 September 23rd – 26th

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

Time-Based Modeling

EMS Users Conference 9 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 10 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 11 September 23rd – 26th

Time Based Modeling Example – Part 3

EMS Users Conference 12 September 23rd – 26th

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

Future Model Creation

EMS Users Conference 13 September 23rd – 26th

NMMS

• 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

Common Information Model (CIM)

EMS Users Conference 14 September 23rd – 26th

NMMS – Detailed Overview

Market Participant(Operations)

Dated Job

NMMS

Web

-Bas

ed U

IDated Job

Dated Job

Dated Job

Dated Job

Import

Incremental Ops File

Make Changes Directly

Creates

Cas

e B

uild

er

EMS (AREVA)MMS (ABB)Outage Scheduler (ABB)

Topology Processor

Planning (Siemens PTI)Incremental

Planning File

Base Ops

Model

Planning Model

Operational Data

Planning Data

Market Participant(Planning)

Upload

+

Base Ops

Model

Dated Job

DatedProject

DatedProject

DatedProject

DatedProject

DatedProject

DatedProject

+

Operational Model

Planning Model

CRR (Nexant)

EMS Users Conference 15 September 23rd – 26th

Questions?