Texas Nodal Network Modeling and Telemetry TAC Meeting By Raj Chudgar, ERCOT Friday, 12/01/2006

1 Texas Nodal

Texas Nodal

Network Modeling and TelemetryTAC Meeting

By Raj Chudgar, ERCOT

Friday, 12/01/2006

2 Texas Nodal

NMT – Network Operations Modeling & Telemetry - Project

Agenda– Network Model Data Issues

• Overview• Automated Data Query Results by Market Participant• Process• Summary of issues to date• Progress by Market Participant to date

– Critical Measurements Update• Overview• Counts by Market Participant • Critical Measurement Definitions

– Summary

– ERCOT TDSP Road Show Update

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Network Model Data Issues

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Determining Model Data Issues Process– Developed a series of queries looking for plausibility issues

concerning:• Modeling Issues

• ICCP Mapping Issues

– Queries run every 2 weeks after each Genesys EMS database load

– Queries generate issues which are loaded into an Access database

– Issues are assigned to NMT project team members to investigate and resolve internally within ERCOT as a first step

• Procedures have been documented on how to investigate and resolve issues

– Remaining unsolved issues are discussed with individual Market Participants to resolve

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Model Data Issue ProcessNMT / Market Participant Process

Mar

ket

Par

tici

pan

tsO

per

atio

ns

Mo

del

ing

EM

MS

Pro

d

ICC

PN

MT

Sys

tem

s O

per

atio

ns

Handover items > 30 days old

Manage Production Data Issues

Data Query Process

ICCP Data Research

Network Model Data Research

Determine Priority and

Assign

Internal review to determine items to send

to MP

NMT SE Spreadsheet

Pending

NMT SE Spreadsheet

To Implement

Create Service Request

Implement

Implement

NMT SE Spreadsheet

Closed

Determine Resolution

Scheduled Meeting

Verify Implemented

Items

NMT SE Spreadsheet

Assigned

Email

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Model Data Issues Query Result Set – as of 11/17/2006

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Model Data Issues Progress by MP – as of 11/17/2006

Description Initi

al C

onta

ct E

stab

lishe

d T

elem

etry

Ana

lysi

s C

omm

unic

ated

Tel

emet

ry A

naly

sis

Com

plet

ed D

ata

Que

ry Is

sues

Iden

tifie

d T

elem

etry

Dat

a Is

sues

P

endi

ng

Ass

igne

d

T

o Im

plem

ent

C

lose

d

Mo

del

ing

Dat

a Is

sues

P

endi

ng A

ssig

ned

T

o Im

plem

ent

C

lose

d

TO

TA

L D

ata

Issu

es

Pen

ding

Ass

igne

d

T

o Im

plem

ent

C

lose

d

T

OT

AL

%

Co

mp

lete

%

Pen

din

g

Austin Energy P P 0% 100% 57 3 78 2 5 0 59 3 83 145 57% 0%American Electric Power P P 35% 100% 372 229 1 190 1 11 373 229 1 201 804 25% 46%Brazos Electric Cooperative P P 75% 100% 120 164 1 0 120 0 165 285 58% 0%Bryan Texas Utilities P P 35% 100% 18 10 2 1 18 11 0 2 31 6% 58%Centerpoint P P 35% 100% 2 131 34 298 3 10 6 2 134 44 304 484 63% 0%City Public Services P P 50% 100% 29 20 55 6 0 35 20 55 110 50% 0%Denton Municipal Electric P P 50% 100% 7 11 1 1 7 11 0 2 20 10% 35%Garland Power and Light P P 50% 100% 42 2 14 0 42 2 14 58 24% 0%

100% 4 9 1 4 9 0 1 14 7% 29%Lower Colorado River P P 50% 100% 279 53 7 71 2 9 279 55 7 80 421 19% 66%Brownsville Public Utilities P P 25% 100% 22 14 1 0 22 0 15 37 41% 0%Qualified Scheduling Entities 26 14 4 1 27 14 0 4 45 9% 60%

100% 7 1 5 7 1 0 5 13 38% 54%South Texas Electric Coop P P 50% 100% 82 48 3 0 82 3 48 133 36% 0%

100% 4 4 0 0 0 4 0% 100%Texas Municipal Power Auth P P 10% 100% 20 22 6 20 22 0 6 48 13% 42%Texas-New Mexico Power P P 0% 100% 44 54 1 1 0 45 0 55 100 55% 0%Texas Utilities P P 40% 100% 1311 100 75 1 3 4 6 1312 103 4 81 1500 5% 87%

0 2050 976 67 1080 0 3 18 17 41 0 2053 994 84 1121 4252 26% 48%

Note 1: Blank TDSP indicates ones that ERCOT has not contacted to dateNote 2: NMT inherited ~400 legacy model issues

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Critical Measurements Telemetry Analysis

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Critical Measurements Update– Identify possible new Telemetry as required by Nodal Protocols

and Criteria• Input based on ERCOT snapshots – normal & peak loads• Processed using GEN-SE tool by Nexant• NMT provided spreadsheets to each MP• MPs must provide new telemetry (schedule) or justifications, (e.g. why not

needed) for each point

– NMT is working with each MP when there are questions– MPs submit Service Requests when issues are identified– Next Steps (on-going)

• NMT / Nexant will rerun analysis after Service Requests are implemented• NMT will provide results back to MPs• NMT will have final schedules for new telemetry or documented justifications

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Critical Measurement Counts by MP

MP Description Cri

tica

l Bu

ses

69

KV

138

KV

Tot

al

Un

ob

serv

able

Bu

ses

69

KV

138

KV

345

KV

Tot

al

Wea

kly

Ob

serv

able

Bu

ses

69

KV

138

KV

Tot

al

Co

mb

ined

Bu

ses

TO

TA

L

% o

f TO

TA

L

AEN Austin Energy 0 0%

AEP American Electric Power 25 7 32 138 8 146 38 7 45 223 28%

BEC Brazos Electric Cooperative 22 6 28 9 9 6 5 11 48 6%

BTU Bryan Texas Utilities 1 1 1 1 2 3 0%

CPE Centerpoint 4 20 24 4 10 14 13 26 39 77 10%

CPS City Public Services 1 1 3 3 1 1 5 1%

Denton Denton Municipal Electric 1 1 1 0%

Garland Garland Power and Light 1 1 1 0%

GEUS Greenville 6 6 6 1%

LCRA Lower Colorado River 14 2 16 3 2 1 6 11 2 13 35 4%

PUB Brownsville Public Utilities 1 1 2 2 0%

RCEC 3 12 15 3 3 18 2%

RGEC 2 2 2 0%

STEC South Texas Electric Coop 9 9 5 5 11 11 25 3%

TEXLA Texas Louisiana 1 1 1 1 2 0%

TMPA Texas Municipal Power Auth 1 1 2 1 3 4 1%

TNMP Texas-New Mexico Power 6 6 26 2 28 10 1 11 45 6%

TXU Texas Utilities 31 53 84 52 50 102 43 58 101 287 37%

112 90 202 249 89 1 339 136 107 243 784 100%TOTAL

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• Critical Measurement Definitions– Critical Measurements

• Measurements pairs (Mw and Mvar) whose loss will result in unobservability of one or more buses are called critical measurements. SE will not be able to detect errors in critical measurements due to lack of redundancy and hence errors in critical measurements will significantly affect the SE solution and hence the security assessment.

– Unobservable Buses• Buses lacking sufficient measurements around them to make them observable

are called unobservable buses. SE runs in this area of network using distributed load schedules. So the solution around these buses (Thermal and voltage violations) is not fully reliable.

– Weakly Observable Buses• A weakly observable bus does not have any injection measurements or

measurements on connected branches. It is observable due to injections at adjacent buses. As the name implies, these buses are weakly observable.

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• Summary– Major Model clean-up underway

• Target to complete by 3/31/2007

– Major Telemetry effort underway• Target to have all justifications and schedules for new implementations by

3/31/2007• Implementation schedule will be published end of 1Q2007

– ERCOT will continue to provide progress reports to TPTF, TAC, and ROS on a regular basis

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ERCOT / TDSP Road Show

Progress Update

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ERCOT / TDSP Road Show Update

• ERCOT started the Road show in August 2006 to work with TDSPs

to “jump start” their Nodal efforts

– TDSPs are critical for EDS 1 and EDS 2 as defined by the Nodal

Transition Plan

– TDSPs are on the critical path for Nodal to be successful

• ERCOT has met with 7 of the 18 TDSPs

– ERCOT Wholesale Client Services is attempting to schedule time

with all remaining TDSPs by 1Q2007

– All remaining have been contacted, and 4 have been scheduled for

Dec 2006 or Jan 2007.

– ERCOT presented Nodal information at LCRA “Storm Team”

meeting for many smaller TDSPs that are within LCRA jurisdiction

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ERCOT / TDSP Road Show Details

TSP Name Road Show Status

AEP TEXAS CENTRAL COMPANY Complete

BRAZOS ELECTRIC POWER CO OP INC (TDSP) In Planning – Jan 07

BROWNSVILLE PUBLIC UTILITY BOARD (TDSP) Contacted

BRYAN TEXAS UTILITIES (TDSP) Contacted

CENTERPOINT ENERGY HOUSTON ELECTRIC LLC (TDSP) Complete

CITY OF AUSTIN DBA AUSTIN ENERGY (TDSP) Complete

CITY OF COLLEGE STATION (TDSP) Contacted

CITY OF GARLAND (TDSP) Complete

CITY OF SAN ANTONIO CITY PUBLIC SERVICE (TDSP) Complete

DENTON MUNICIPAL ELECTRIC (TDSP) Contacted

GEUS (TDSP) Contacted

LCRA TRANSMISSION SERVICES CORPORATION Complete

MAGIC VALLEY ELECTRIC CO OP INC (TDSP) Joint with STEC (Scheduled Dec 6th)

RAYBURN COUNTRY CO OP DBA RAYBURN ELECTRIC (TDSP) Contacted

SOUTH TEXAS ELECTRIC CO OP INC Scheduled Dec 6th

TEXAS MUNICIPAL POWER AGENCY Contacted

TEXAS-NEW MEXICO POWER CO (TDSP) In Planning

TXU ELECTRIC DELIVERY (TDSP) Complete

Documents

Texas Nodal Network Modeling and Telemetry TAC Meeting By Raj Chudgar, ERCOT Friday, 12/01/2006