November 11, 2010

ROS

ERCOT Planning Go-Live Update

Jay TeixeiraManager, Seasonal Planning

2 ROSNovember 11, 2010

ERCOT Concerns regarding Planning Go-Live

• Topology Processor is in production for CRR– Data, such as connectivity node groups (CNG) must be

maintained by ERCOT and TSPs– Equipment IDs and Circuit IDs for all equipment must be

populated and unique and are dependent on correct CNG definition

• TSPs will need to commit to Go-Live barring unforeseen major problems– SCR needs commitment

• No reflection on current TSP efforts, but TSPs will need to commit necessary resources to complete testing in an expeditious manner– 2012 Base Case testing– SCR testing, testing timelines will be tight– Building base cases while testing system has stressed workload

3 ROSNovember 11, 2010

ERCOT Concerns regarding Planning Go-Live

• June PLWG discussion on no longer creating Data Set A cases because TSPs do not use them

• Delay affects Data Set A cases which where shown to be mainly used by ERCOT– Big effect on Near Term congestion analysis and studies to

support ERCOT Operations– Studies simulate planned outages, manual process to map to

SSWG cases

4 ROSNovember 11, 2010

Data Set A Uses from June PLWG meeting

ERCOT Use DS A Case Used

Determining Flat load for Near Term congestion and 5 year plan cases

Uses all 8 cases for range of load level.

SPS Reviews Can use any of all 8 cases depending on SPS under study and time frame

RMR Analysis Can use any of all 8 cases depending on RMR unit under study and time frame

Transmission Loss Factor Calculations Uses generation, load, losses from all 8 cases

Near term congestion analysis Uses summer peak topology

ERCOT Operations requested studies Can use any of all 8 cases

Dynamic Data Set (wind and no wind) Currently use summer peak, DWG proposal to use peak and off-peak case

Stability Screening Studies (Dynamic and Voltage)

PV and TS for summer, PV for winter peak and TS for winter off-peak

NERC Compliance Studies Summer peak and one off-peak

Voltage Profile Studies Peak(Sum, Win) and Off peak (Spg, Fal) cases

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Current Process – Separate System for Planning

ROS November 11, 2010

ERCOTManual Process

TSP Review

Case complete

?

Case Posted

Yes

NoTSPs submitChanges via IDEV, other

NMMS db

ERCOT Topology

Processor for ODMS

ERCOT/TSP Network Model

update via NOMCR

CRR Top Output

Planning Case

Creation

ERCOT Dispatch

TSPs submit RAWD files for their area

containingTopology,

Load, Voltage Control

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Topology Processor/Model on Demand Integrated System

ROS November 11, 2010

TSPProfiles

Planning Topology

Output

TSP Review

Case complete

?

Case Posted

Yes

NoTSPs submitChange via MOD

NMMS db

ERCOT Topology

Processor for ODMS

ERCOT/TSP Network Model

update via NOMCR

CRR Topology Output

Planning Case Output

ERCOTModel on Demand

TSP Standard PMCR

TSP Future PMCR

ERCOT DispatchProfile

7

Model on Demand Separated System

ROS November 11, 2010

TSPProfiles

Topology from Existing

Planning Case

TSP Review

Case complete

?

Case Posted

Yes

NoTSPs submitChange via MOD

NMMS db

ERCOT Topology

Processor for ODMS

ERCOT/TSP Network Model

update via NOMCR

CRR Top Output

Planning Case Output

ERCOTModel on DemandTSP

Future PMCR

ERCOT DispatchProfile

8

MOD Standard PMCR Count by TSP as of 11/8/10

ROS November 11, 2010

Bus Branch Load GenSwiched Shunt XF FACT

Mult-Section Lines Area Owner Totals

Total of DSB Submission

%Size of DSB submission

AEN Add 1 14 1 7 1 24Delete 2 23 3 1 29Modify 2 14 16

3 37 6 1 0 21 1 0 0 0 69 263 26.24%AEP Add 8 1 133 8 1 9 1 3 164

Delete 3 5 7 1 1 17Modify 7 2 5 2 16

18 6 133 17 2 10 0 0 6 5 197 2638 7.47%CNP Add 38 165 97 9 26 7 151 493

Delete 93 251 125 9 21 5 504Modify 10 7 6 86 109

141 423 228 18 47 98 0 151 0 0 1106 1833 60.34%CPS Add 13 13

Delete 13 6 19Modify 22 22

0 26 6 0 22 0 0 0 0 0 54 349 15.47%GPL Add 6

Delete 6Modify 2 1 3

0 2 0 13 0 0 0 0 0 0 3 273 1.10%LCRA Add 383 383

Delete 324 324Modify 1 1

0 0 708 0 0 0 0 0 0 0 708 1043 67.88%Oncor Add 253 253

Delete 2 2Modify 0

0 0 0 0 255 0 0 0 0 0 255 5087 5.01%STEC Add 6 3 3 12

Delete 6 16 3 25Modify 4 4

0 12 23 0 0 6 0 0 0 0 41 5087 0.81%AEN deleted Gen is Statcom, added back as new bus and FACTDSB case used was 12Sum1 of pass9 11DSB. Only Busses, Branches, and Transformers were included in count.

Topology Processor Results from the 2010 Test case as of 11-08-2010

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SCR Resolution Methodology (Preliminary)

ROS November 11, 2010

Deficiency Number

Deficiency Description

Requested

Functionality currently

exists in MOD

Changes required if SCR is

Implemented

CIM Modification

Topology Processor

Code Change

Potential Impact to

other Nodal Systems

1 Topology Processor Upgrade to output PSS/E v32

Y Y Y Y

2 Distribution Cap Banks

Y Y Y Y

3 Zero Impedance line ratings

Y N Y N

4 Associate Loads and Caps with the correct CNG

Y Y Y Y

5 Additional Autotransformer data for Planning

Y Y Y Y

6 FACTS Devices

Y Y Y Y

7 Assign valid PSSE IDs to Breakers/Switches/Series Devices

Y N Y N

8 Phase shift of Autos for short circuit studies

Y Y Y Y

10

SCR Resolution Timeline (Preliminary)

ROS November 11, 2010

Month/Yr Action Required

Nov 10 SCR760 submitted, begin Nodal Project stabilization prioritization, include SCR759

Dec 10 Impact Analysis on SCR760

Jan 11 Finalize stabilization projects priority, SCR760 to Board of Directors

Feb 11

Mar 11 SCR760 items involving only Topology Processor code fixes possible

Apr 11 Begin Data Set A build with Integrated or MOD Separated System

May 11 Remaining SCR760 items deadline for Annual Planning Model

Jun 11

Jul 11 Begin Annual Planning Model Updates using Integrated System (pass 0)

Aug 11

Sep 11 Annual Planning Model Updates Due September 1 (equiv pass 4)

Oct 11 Annual Planning Models Released October 15th

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ERCOT Request

ROS November 11, 2010

• SSWG commitment to Go-Live barring unforeseen major problems

• TSPs commitment to provide resources to complete testing in an expeditious manner

• Decide Model on Demand Separated System Go-Live for 2012 Data Set A case build first

• Then decide for 2012 Data Set A whether to move to Topology Processor/Model on Demand Integrated System

12

Other Issues

November 11, 2010 ROS

13

Protocol 3.10.2 – Which Five Years?

ROS November 11, 2010

3.10.2 Annual Planning Model (1)For each of the next five years, ERCOT shall develop models for annual planning purposes that contain, as much as practicable, information consistent with the Network Operations Model. The “Annual Planning Model” for each of the next five years is a model of the ERCOT power system (created, approved, posted, and updated regularly by ERCOT) as it is expected to operate during peak Load conditions for the corresponding future year.(2).(3).(4).

(5)ERCOT shall coordinate updates to the Annual Planning Model with the Network Operations Model to ensure consistency of data within and between the Annual Planning Model and Network Operations Model to the extent practicable.

14 ROSNovember 11, 2010

Topology Processor/SSWG Case Comparison

Difference In 8/30/2010 10/5/2010 Delta %Impedances Both R&X 789 382 -51.6%

R 53 21 -60.4%X 68 53 -22.1%

Total 910 456 -49.9%Line Ratings Both Rate A and B 370 67 -81.9%

Rate A 28 10 -64.3%Rate B 89 87 -2.2%

Total 487 164 -66.3%

• Case Comparison between Topology Processor and 10FAL1 case– Limited to those differences greater than 5%

– Limited to Branches that exist in both cases (From Bus, To Bus, Circuit ID exactly the same)

Branches in Compare list 7965Branches in Both Cases 5142

64.6%

Questions?

November 11, 2010 ROS