spp 2014 tpl dynamic stability assessment

S P P 2 0 1 4 T P L

D y n a m i c S t a b i l i t y A s s e s s m e n t

December 29, 2014

Engineering Research, Development, and Special Studies

Table of Contents Introduction ..................................................................................................................................................1

Study Scope...................................................................................................................................................1

Fast Fault Screening and Dynamic Assessment ........................................................................1

Dynamic Assessment of Member Specified Events ..................................................................1

Mitigation of Unstable Events ...................................................................................................2

Methodology .................................................................................................................................................2

Fast Fault Screening and Dynamics Analysis ..................................................................................2

Member Specified Events ................................................................................................................3

Results ...........................................................................................................................................................3

Fast Fault Screening (FFS) ..............................................................................................................3

Transient Stability Analysis of Most Severe FFS Events ................................................................4

Transient Stability Analysis of Member Submitted Events .............................................................4

Conclusion ....................................................................................................................................................4

APPENDIX A - Events ................................................................................................................................6

Table 1: NERC Category B, C, & D, Fast Fault Scan Results ................................................................. 6

Table 2: Member Submitted NERC Category B, C, and D Events .......................................................... 9

APPENDIX B - Results ...............................................................................................................................13

Table 3: Unstable Events........................................................................................................................ 13

APPENDIX C – Outaged Branches ...........................................................................................................14

Table 4: NERC Category B, C, & D, FFS Outaged Branches ............................................................... 14

APPENDIX D: Plots and and FFS Data ...................................................................................................22

2014 Stability Study 1

Introduction

The objective of this study is to report findings from the 2014 Stability Compliance Assessment

process to support compliance with NERC TPL-001, TPL-002, TPL-003, and TPL-004 Reliability

Standards for future years 2015 and 2020. This report, along with the Near-Term and Long-Term

Load Flow Assessments, fulfill requirements of applicable TPL Standards.

This report summarizes the potential transient stability violations anticipated by SPP and the

applicable mitigation plans developed by SPP Member Entities and SPP Engineering Staff.

A separate comprehensive report will be issued detailing the 2014 Transmission Planning

Compliance Statement for each TPL Standard. This report will address how each requirement

defined in the TPL Standards is fulfilled by one or more mechanism in the TPL Near-Term or

Longer-Term Compliance Assessments.

Study Scope

Compliance with TPL Standards with respect to system stability requires the following be

completed:

Fast Fault Screening and Dynamic Assessment

Perform a Fast Fault Screening analysis of the SPP Transmission System on the MDWG

2014 Series 2015 Light Load and 2020 Summer Peak Case. Provide a list of potential severe

fault locations, their ranking, and fault sequences for potential category B, C, and D

contingencies.

Perform a transient stability analysis on those FFS screened contingencies with steady state

stability violation, loss of generation, or a computed critical clearing times less than 9 cycles

for both the 2015 and 2020 case.

Dynamic Assessment of Member Specified Events

SPP Members provided SPP Staff with a list, shown in Table 4 of Appendix A, of fifty-six

(56) NERC Category B (Cat. B), Category C (Cat. C) and Category D (Cat. D) reliability

events for transient stability performance analysis. A transient stability analysis was

performed for both the 2015 Light Load and 2020 Summer Peak Cases using these member

submitted events.


Mitigation of Unstable Events

Determine mitigation measures for any events found to be unstable that will, by

implementation, provide system stability.

Methodology

Fast Fault Screening and Dynamics Analysis

The Fast Fault Screening (FFS) tool in the POM-TS application screens potential transmission fault

locations for grid stability analysis and quickly identifies the most severe fault locations and ranks

them in the order of severity. The tool begins by identifying the most severe fault locations, above

100kV, which are considered the weaker points in the network. Faults at each of the identified

locations are then ranked according to severity using a Ranking Index (RI) for the loss of one (Cat.

B), two (Cat. C), or multiple (Cat. D) lines, transformers, or generators at each ranked bus. The fault

severity is classified as:

1. Most severe are the faults that lead to steady-state stability violation (e.g., post-fault regime does

not exist);

2. The next level of severity are faults leading to large loss of generation;

3. The rest of the locations are ranked based on the Ranking Index and CCT.

Once the RI is known, the critical clearing time (CCT) is computed. The Critical Clearing Time is

the maximum time during which a disturbance can be applied without generator units losing

transient stability. Details on the methodology are given in [1]. The RI and CCT are used as metrics

to determine fault locations that merit further examination.

Transient stability analysis was performed on ranked contingencies having a steady state stability

violation, a loss of generation, or a critical clearing time of less than 9 cycles using PTI’s PSS/E

Dynamics Package and the PSSPLT Plotting Package. The FFS identifies the fault bus and

associated “outaged branches” (see table 4); however, the fault sequence was determined by SPP,

and was as follows:

Category B: Apply fault at ranked bus for a time span of CCT cycles and open “outaged

branch”

Category C: Open first “outaged branch” and allow steady state system adjustments. Apply

fault at ranked bus for a time span of CCT cycles and open second “outaged branch”


Category D: Apply fault at the ranked bus for a time span of CCT cycles and open all

“outaged branches” at the bus.

Generator rotor speed, rotor angle, real power, and reactive power output were monitored for all SPP

generators during the time domain simulation. Those generators exhibiting rotor speed and angle

instability were marked for further analysis. This analysis consisted of determining and correcting

the cause of instability and is further detailed in Results Section of this report.

Any unstable Category D event generator(s) were disconnected during the simulation and re-

simulated to determine stability for the remaining system.

Member Specified Events

These events were simulated in PTI’s PSS/E Dynamics Package and the PSSPLT Plotting Package.

Generator rotor speed, rotor angle, real power, and reactive power output were monitored for all SPP

generators. Those generators exhibiting rotor speed and angle instability were marked for further

analysis. This analysis consisted of determining and correcting the cause of instability and is further

detailed in Appendix B of this report.

Some events necessitated a change in generation differing from that amount in the powerflow

models. In such cases, an offset amount was included to balance generation prior to event

simulation.

Any unstable Category D event generator(s) were disconnected during the simulation and re-

simulated to determine stability for the remaining system.

Results

Fast Fault Screening (FFS)

The screening identified severe fault locations for the 2015 Light Load and 2020 Summer cases.

These locations (buses) were ranked according to their Ranking Index (RI) and Critical Clearing

Time (CCT) for NERC category B, C, and D contingencies. The results are shown in Appendix A,

Table 1. The outaged element(s) associated with each fault are shown in Appendix C, Table 4 and

are considered only if real power is leaving the faulted bus.


Transient Stability Analysis of Most Severe FFS Events

Transient stability analysis was performed on the events identified in Appendix C, Table 4 using

PSS/E’s dynamics package. Those events resulting in instability are discussed below and are shown

in Appendix B, Table 3.

Event 20S-FFS-CATC_15 caused the LPLFUTURE unit owned by Lubbock Power and Light to be

unstable when, with a prior outage of the LPHOLLY - LPSOUTHEAST 230kV line, a fault occurs

on the LPHOLLY 230kV bus and the LPHOLLY - JONES 230kV line is opened. Therefore, an

operating guide is needed such that for a prior outage of the LPHOLLY - LPSOUTHEAST 230kV

line, the output of the LPFUTURE must be curtailed to 400MW until such time that the line is

returned to service. This assumes the LPHOLLY - JONES 230kV line will trip in 6 cycles should

the fault occur. It should be noted that this future generator has not been vetted through SPP’s

Generator Interconnection process and its location in the power flow as well as the dynamics data for

the generator associated with this unit are a proxy for a future unit(s).

Transient Stability Analysis of Member Submitted Events

Members provided eleven (11) Category B, twenty-six (26) Category C, and nineteen (19) Category

D events for examination. Transient stability analysis was performed on these events using PSS/E’s

dynamics package. There was no resulting system instability for member submitted events.

Conclusion

The MDWG 2014 Series 2015 Light Load and 2020 Summer Peak Load Cases were tested and

found to be stable during normal conditions prior to this study, satisfying NERC TPL Category A

requirements.

All Category B FFS and Member Submitted events were found to be stable when the clearing times

were tested, satisfying NERC TPL Category B requirements.

All Category C FFS and Member Submitted events were found to be stable, with the exception of

Category C Event 20S-FFS-CATC_15, which will require an operating guide as described in the


results section of this document. The specified mitigation measure, together with all tested stable

events ensures that NERC TPL Category C requirements are satisfied.

All Category D FFS and Member Submitted events were found to be stable thereby satisfying NERC

TPL Category D requirements.

[1] [1] M. Y. Vaiman, A. Gaikwad, "Fast Fault Screening Methodology for Transient Stability Analysis of Bulk Power Systems", Presented at 2013

IEEE Power and Energy General Meeting, pp:1-5.


APPENDIX A - Events

Table 1: NERC Category B, C, & D, Fast Fault Scan Results

FFS Event Bus

Number Bus Name BaseKV Transient Analysis Results Clearing

Time(cyc)

Fault-2014-15L-FFS-CATB_20 659101 ANTELOP3 345 Stable 5.0

Fault-2014-15L-FFS-CATB_1 659131 LARAMIE3 345 Stable 6.0

Fault-2014-15L-FFS-CATB_2 510406 N.E.S.-7 345 Stable 8.4

Fault-2014-15L-FFS-CATB_3 507454 TURK 4 138 Stable 7.2

Fault-2014-15L-FFS-CATB_4 532797 WOLFCRK7 345 Stable 6.0

Fault-2014-15L-FFS-CATC_1 659101 ANTELOP3 345 Stable 5.0

Fault-2014-15L-FFS-CATC_2 659131 LARAMIE3 345 Stable 5.0

Fault-2014-15L-FFS-CATC_3 652541 BIGBND24 230 Stable 6.0

Fault-2014-15L-FFS-CATC_4 510406 N.E.S.-7 345 Stable 7.2

Fault-2014-15L-FFS-CATC_5 507454 TURK 4 138 Stable 4.8

Fault-2014-15L-FFS-CATC_6 542982 IATAN 7 345 Stable 3.0

Fault-2014-15L-FFS-CATC_7 532797 WOLFCRK7 345 Stable *4.6

Fault-2014-15L-FFS-CATD_1 659101 ANTELOP3 345 Stable 5.0

Fault-2014-15L-FFS-CATD_2 659131 LARAMIE3 345 Stable 5.0

Fault-2014-15L-FFS-CATD_3 532797 WOLFCRK7 345 Stable 5.0

Fault-2014-15L-FFS-CATD_4 510406 N.E.S.-7 345 Stable 5.0

Fault-2014-15L-FFS-CATD_5 542982 IATAN 7 345 Stable 5.0

Fault-2014-15L-FFS-CATD_6 532766 JEC N 7 345 Stable 5.0

Fault-2014-15L-FFS-CATD_7 507454 TURK 4 138 Stable 8.0

Fault-2014-15L-FFS-CATD_8 645451 S3451 3 345 Stable 5.0

Fault-2014-15L-FFS-CATD_9 512650 GRDA1 7 345 Stable 5.0

Fault-2014-15L-FFS-CATD_10 532853 LAWHILL6 230 Stable 6.0

Fault-2014-15L-FFS-CATD_11 549954 JTEC 5 161 Stable 8.0

Fault-2014-15L-FFS-CATD_12 652509 FTRANDL4 230 Stable 6.0

Fault-2014-15L-FFS-CATD_13 652541 BIGBND24 230 Stable 6.0

Fault-2014-15L-FFS-CATD_15 509807 ONETA--7 345 Stable 8.4

Fault-2014-20S-FFS-CATB_51 507789 STLGENS4 138 Stable 8.0

Fault-2014-20S-FFS-CATB_52 659332 WATFRDCMBC4X 230 Stable 6.0

Fault-2014-20S-FFS-CATB_53 652540 BIGBND14 230 Stable 6.0

Fault-2014-20S-FFS-CATB_54 547503 RIV452T 5 161 Stable 8.0

Fault-2014-20S-FFS-CATB_55 547501 RIV453 5 161 Stable 8.0

Fault-2014-20S-FFS-CATB_56 533422 HEC U4 3 115 Stable 8.0

Fault-2014-20S-FFS-CATB_1 659131 LARAMIE3 345 Stable 3.0

Fault-2014-20S-FFS-CATB_2 532766 JEC N 7 345 Stable 4.8

Fault-2014-20S-FFS-CATB_3 532852 JEC 6 230 Stable 8.4


Fault-2014-20S-FFS-CATB_4 542982 IATAN 7 345 Stable 8.4

Fault-2014-20S-FFS-CATB_5 523853 FINNEY 7 345 Stable 8.4

Fault-2014-20S-FFS-CATB_6 505502 TRUMAN 5 161 Stable 8.4

Fault-2014-20S-FFS-CATB_7 507454 TURK 4 138 Stable 7.2

Fault-2014-20S-FFS-CATB_8 547476 ASB349 5 161 Stable 8.4

Fault-2014-20S-FFS-CATB_10 659101 ANTELOP3 345 Stable 8.4

Fault-2014-20S-FFS-CATB_11 542981 LACYGNE7 345 Stable 8.4

Fault-2014-20S-FFS-CATB_13 532797 WOLFCRK7 345 Stable 6.0

Fault-2014-20S-FFS-CATC_1 659131 LARAMIE3 345 Stable 5.0

Fault-2014-20S-FFS-CATC_2 507789 STLGENS4 138 Stable 9.0

Fault-2014-20S-FFS-CATC_3 652216 WATFORD4 230 Stable 6.0

Fault-2014-20S-FFS-CATC_4 659332 WATFRDCMBC4X 230 Stable 7.0

Fault-2014-20S-FFS-CATC_5 652540 BIGBND14 230 Stable 7.0

Fault-2014-20S-FFS-CATC_6 547501 RIV453 5 161 Stable 9.0

Fault-2014-20S-FFS-CATC_7 547503 RIV452T 5 161 Stable 9.0

Fault-2014-20S-FFS-CATC_8 533422 HEC U4 3 115 Stable 9.0

Fault-2014-20S-FFS-CATC_9 505502 TRUMAN 5 161 Stable 9.0

Fault-2014-20S-FFS-CATC_10 532766 JEC N 7 345 Stable *4.6

Fault-2014-20S-FFS-CATC_11 542982 IATAN 7 345 Stable 7.2

Fault-2014-20S-FFS-CATC_12 531445 GRDNCTY3 115 Stable 6.0

Fault-2014-20S-FFS-CATC_13 532852 JEC 6 230 Stable 7.2

Fault-2014-20S-FFS-CATC_14 542981 LACYGNE7 345 Stable 4.8

Fault-2014-20S-FFS-CATC_15 522870 LP-HOLLY 6 230 Unstable 0.6

Fault-2014-20S-FFS-CATC_16 547476 ASB349 5 161 Stable 8.4

Fault-2014-20S-FFS-CATC_18 523853 FINNEY 7 345 Stable 8.4

Fault-2014-20S-FFS-CATC_19 507454 TURK 4 138 Stable 6.0

Fault-2014-20S-FFS-CATC_20 659101 ANTELOP3 345 Stable 7.2

Fault-2014-20S-FFS-CATC_21 645458 S3458 3 345 Stable 8.4

Fault-2014-20S-FFS-CATC_22 532797 WOLFCRK7 345 Stable *4.6

Fault-2014-20S-FFS-CATC_27 659105 LELANDO3 345 Stable 8.4

Fault-2014-20S-FFS-CATD_1 532766 JEC N 7 345 Stable 5.0

Fault-2014-20S-FFS-CATD_2 542981 LACYGNE7 345 Stable 5.0

Fault-2014-20S-FFS-CATD_3 542982 IATAN 7 345 Stable 5.0

Fault-2014-20S-FFS-CATD_4 645458 S3458 3 345 Stable 5.0

Fault-2014-20S-FFS-CATD_5 532797 WOLFCRK7 345 Stable 5.0

Fault-2014-20S-FFS-CATD_6 659101 ANTELOP3 345 Stable 5.0

Fault-2014-20S-FFS-CATD_7 510396 N.E.S.-4 138 Stable 8.0

Fault-2014-20S-FFS-CATD_8 532852 JEC 6 230 Stable 6.0

Fault-2014-20S-FFS-CATD_9 507454 TURK 4 138 Stable 8.0

Fault-2014-20S-FFS-CATD_10 659131 LARAMIE3 345 Stable 5.0

Fault-2014-20S-FFS-CATD_11 547498 STL439 5 161 Stable 8.0

Fault-2014-20S-FFS-CATD_12 645451 S3451 3 345 Stable 5.0

Fault-2014-20S-FFS-CATD_13 652519 OAHE 4 230 Stable 6.0


Fault-2014-20S-FFS-CATD_14 507789 STLGENS4 138 Stable 8.0

Fault-2014-20S-FFS-CATD_15 522870 LP-HOLLY 6 230 Stable 6.0

Fault-2014-20S-FFS-CATD_16 510406 N.E.S.-7 345 Stable 5.0

Fault-2014-20S-FFS-CATD_17 549954 JTEC 5 161 Stable 8.0

Fault-2014-20S-FFS-CATD_18 520948 HUGO PP4 138 Stable 8.0

Fault-2014-20S-FFS-CATD_19 652216 WATFORD4 230 Stable 6.0

Fault-2014-20S-FFS-CATD_20 532853 LAWHILL6 230 Stable 6.0

Fault-2014-20S-FFS-CATD_21 520999 MOORLND4 138 Stable 8.0

Fault-2014-20S-FFS-CATD_22 542995 MONTROS5 161 Stable 8.0

Fault-2014-20S-FFS-CATD_23 652441 GARRISN4 230 Stable 6.0

Fault-2014-20S-FFS-CATD_24 541341 S.HARP 5 161 Stable 8.0

Fault-2014-20S-FFS-CATD_25 659332 WATFRDCMBC4X 230 Stable 6.0

Fault-2014-20S-FFS-CATD_26 652540 BIGBND14 230 Stable 6.0

Fault-2014-20S-FFS-CATD_27 546653 NEARMAN5 161 Stable 8.0

Fault-2014-20S-FFS-CATD_28 531445 GRDNCTY3 115 Stable 8.0

Fault-2014-20S-FFS-CATD_29 547501 RIV453 5 161 Stable 8.0

Fault-2014-20S-FFS-CATD_30 547503 RIV452T 5 161 Stable 8.0

Fault-2014-20S-FFS-CATD_31 533180 TEC E 3 115 Stable 8.0

Fault-2014-20S-FFS-CATD_32 547476 ASB349 5 161 Stable 8.0

Fault-2014-20S-FFS-CATD_33 511437 COMANC-4 138 Stable 8.0

Fault-2014-20S-FFS-CATD_34 533422 HEC U4 3 115 Stable 8.0

Fault-2014-20S-FFS-CATD_35 505502 TRUMAN 5 161 Stable 8.0

Fault-2014-20S-FFS-CATD_38 523853 FINNEY 7 345 Stable 8.4

Fault-2014-20S-FFS-CATD_39 659105 LELANDO3 345 Stable 4.8

Fault-2014-20S-FFS-CATD_40 505460 BULL SH5 161 Stable 7.2

* The individual member supplied this CCT


Table 2: Member Submitted NERC Category B, C, and D Events

Event Contingency Description Transient

Analysis Results

Fault-2014-15L-MS-CATB_1 3-Ø fault on the 230 kV side of the Knoll 230/115 kV transformer with normal clearing.

Stable

Fault-2014-15L-MS-CATB_2 A 3 cycle, 3-phase fault at the 103rd & Rokeby 345 kV end of the 103rd & Rokeby – S3458 345 kV line.

Stable

Fault-2014-15L-MS-CATB_3 3-Ø fault at S3451 on T3 transformer. Normal clearing.

Stable

Fault-2014-15L-MS-CATB_4 3-Ø fault at S1206 on the S1206-S1232 line. Normal clearing.

Stable

Fault-2014-15L-MS-CATB_5 N01A : 3PH fault at GGS on GGS-Sweetwater 345 kV Circuit #1; Normal clearing; No reclose attempts

Stable

Fault-2014-15L-MS-CATB_6 N07A : 3PH fault at GGS on GGS-Red Willow 345 kV; Normal clearing; No reclose attempts

Stable

Fault-2014-15L-MS-CATB_7 N25A : 3PH fault at GGS on GGS-North Platte 230 kV Circuit #1; Normal clearing; No reclose attempts

Stable

Fault-2014-15L-MS-CATB_8 3PH fault at GGS on high side of GGS 345/230 kV T-1 transformer; Normal clearing; No reclose attempts

Stable

Fault-2014-15L-MS-CATB_9 Fault on FINNEY-HOLCOMB followed by Line 525832 to 511456 trip at 4 cycles

Stable

Fault-2014-15L-MS-CATB_10 Fault on POTTER_CO-HITCHLAND followed by Line 523961 TO BUS 523097 at 4 cycles

Stable

Fault-2014-15L-MS-CATB_11 Fault on HITCHLAND-WOODWARD followed by Line 523097 TO WOODWARD 345kV BUS 515375 trip at 4 cycles

Stable

Fault-2014-15L-MS-CATC_1

SLG fault w/stuck breaker at Stranger Creek 345 kV (532772); trip Stranger Creek 345-115 kV TX #1 at 4.6 cycles (532772-533268-532811); Clear fault and trip Stranger Creek 345-115 kV TX #3 (532772-533268-532816) at 14.6 cycles;

Stable

Fault-2014-15L-MS-CATC_2 3-Ø fault at Wolf Creek 345 kV (532797) for 4.6 cycles; Trip Wolf Creek-Benton line (532797-532791); No reclosing;

Stable


Reduce Wolf Creek output to 800 MW (Transmission Operating Directive 300); 3-Ø fault for 4.6 cycles at Wolf Creek 345 kV (532797); Trip Wolf Creek-Waverly Wind farm 345 kV line (532797-532799); No reclosing

Stable

Fault-2014-15L-MS-CATC_4 3-Ø fault at Wolf Creek 345 kV for 4.6 cycles (532797); Trip Wolf Creek-Waverly Wind farm 345 kV line (532797-532799); No reclosing;

Stable


Reduce Wolf Creek output to 800 MW (Transmission Operating Directive 302); 3-Ø fault at Wolf Creek 345 kV (532797) for 4.6 cycles; Trip Wolf Creek-Benton 345 kV (532797-532791); No reclosing

Stable


Fault-2014-15L-MS-CATC_6 3-Ø fault at Wolf Creek for 4.6 Cycles (532797); Trip Wolf Creek-Rose Hill line (532797-532794) ; No reclosing;

Stable


Reduce Wolf Creek output to 800 MW (Transmission Operating Directive 301); 3-Ø fault at Wolf Creek 345 kV (532797) for 4.6 cycles; Trip Wolf Creek-Waverly Wind farm 345 kV line (532797-532799); No reclosing

Stable


SLG fault w/stuck breaker at Wolf Creek 345 kV (532797); trip Wolf Creek-Rose Hill 345 kV line (532797-532794) at 4.6 cycles; Clear fault at 10.1 cycles; Wolf Creek 345-40 breaker failure

Stable


3-Ø fault at JEC 345 kV for 4.6 cycles (532766); Trip JEC-Summit 345 kV line (532766-532773); No reclosing; 3-Ø fault at JEC 345 kV (532766) for 4.6 cycles; Trip JEC-Morris 345 kV line (532766-532770); No reclosing;

Stable


SLG fault w/stuck breaker at JEC 345 kV (532766); trip JEC-Hoyt 345 kV line (532766-532765) at 4.6 cycles; Clear fault at 13 cycles and trip JEC Unit 2 (532766-532652); (JEC 345-16 breaker failure)

Stable

Fault-2014-15L-MS-CATC_11 SLG fault on Knoll-Smoky 230 kV line with Knoll breaker 6001 failure.

Stable

Fault-2014-15L-MS-CATC_12 SLG fault on Rice-Circle 230 kV line with Rice breaker 6045 failure.

Stable


SLG fault at S3458 on the S3458 - Cooper Line, followed by a stuck breaker and the opening of the west bus at S3458. Fault Admittance 643 - j 7971 MVA for 2015LL and 683 - j 8311 MVA for 2020SP for initial fault. Fault Admittance 430 - j 6449 MVA for 2015LL and 469 - j 6832 MVA for 2020SP after opening S3458 - Cooper.

Stable

Fault-2014-15L-MS-CATC_14 Prior outage of S3451 - Raun 345 kV. 3-Ø fault at S3451 on T3 transformer. Normal clearing.

Stable


N915 : SLG fault at GGS on GGS-Sweetwater 345 kV Circuit #2, Stuck Breaker (GGS 3322), Drop GGS-Red Willow 345 kV line; Delayed clearing; No reclose attempts

Stable

Fault-2014-15L-MS-CATC_16 A 3 cycle, 3-phase fault at the Wagener 345 kV end of the Wagener – 103rd & Rokeby 345 kV line

Stable

Fault-2014-15L-MS-CATC_17 A 3 cycle, 3-phase fault at the 103rd & Rokeby 345 kV end of the 103rd & Rokeby – S3458 345 kV line

Stable

Fault-2014-15L-MS-CATC_18 Breaker #3003 fails, and the NW 68th & Holdrege 345/115 kV autotransformer is opened at 10 cycles to clear the fault.

Stable

Fault-2014-15L-MS-CATC_19 SLG Fault at GRDA 1, stuck breaker and trip line from Tonnece-GRDA, GRDA transformer #1 and GRDA-Tulsa and GRDA-Sportsman line trip

Stable


Fault-2014-15L-MS-CATC_20 SLG Fault at GRDA 1, stuck breaker and trip line from Tulsa-GRDA, GRDA transformer #1 and GRDA-Tonnece and GRDA-Sportsman line trip

Stable

Fault-2014-15L-MS-CATC_21 SLG Fault at GRDA 1, stuck breaker and trip line from Sportsman-GRDA, GRDA transformer #1 and GRDA-Tulsa and GRDA-Tonnece line trip

Stable

Fault-2014-15L-MS-CATC_22 Prior outage of Northeastern Station - Tulsa North 345 kV; 3-phase fault and trip Northeastern Station - Oneta 345 kV. Northeastern generation at Pmax

Stable

Fault-2014-15L-MS-CATC_23 Prior outage of Northeastern Station - Tulsa North 345 kV; 3-phase fault and trip Northeastern Station - Delaware 345 kV. Northeastern generation at Pmax

Stable

Fault-2014-15L-MS-CATC_24 Prior outage of Riverside Station - Sapulpa Rd 345 kV; 3-phase fault and trip Riverside Station - Pecan Creek 345 kV. Riverside (Cogentrix) generation at Pmax

Stable

Fault-2014-15L-MS-CATC_25 3-phase fault and trip Northeastern Station - Tulsa North 345 / 138 kV DCT (90-909 & 81-822). Northeastern generation at Pmax.

Stable


Phase-to-ground fault Oneta - Riverside Station 345 kV with CB (#3405A) at Oneta. 15-cycle delayed clearing removing Oneta - Clarksville 345 kV. Oneta generation at Pmax

Stable

Fault-2014-15L-MS-CATD_1

Phase-to-ground fault Riverside Station - Red Bud 345 kV with CB (#3405A) at Riverside. 15-cycle delayed clearing removing Riverside - Sapulpa 345 kV. Riverside (Cogentrix) generation at Pmax.

Stable

Fault-2014-15L-MS-CATD_2 Fault at TUCO-OKU followed by line 525832 TO BUS 511456 and Transformer 525832 TO BUS 525830 TO BUS 525824 CKT 1 trip

Stable

Fault-2014-15L-MS-CATD_3 Fault at TUCO-WOODWARD followed by line 515458 TO BUS 525832 CKT 1 and line trip 515458 TO BUS 515375 CKT 1

Stable

Fault-2014-15L-MS-CATD_4 3-Ø fault at South Hays 230 kV bus resulting in the loss of the South Hays 230 kV substation and 230/115 kV transformer.

Stable

Fault-2014-15L-MS-CATD_5 3-Ø fault on the 115 kV side of the Rice 230/115 kV transformer with Rice breaker 3062 failure.

Stable

Fault-2014-15L-MS-CATD_6 3-Ø fault at S3458 on the S3458 - Cooper line, followed by a stuck breaker and the opening of the west bus at S3458.

Stable

Fault-2014-15L-MS-CATD_7 3-Ø fault at JEC 345 (532766). Clear fault and all 345 kV lines and transformers at 4.6 cycles

Stable

Fault-2014-15L-MS-CATD_8 3-Ø fault at Wolf Creek 345 (532797). Clear fault and all 345 kV lines and transformers at 4.6 cycles

Stable

Fault-2014-15L-MS-CATD_9 3-Ø fault at Wichita 345 kV (532796). Clear fault and all 345 kV lines and transformers at 4.6 cycles

Stable

Fault-2014-15L-MS-CATD_10 A 23-cycle, 3-phase fault, with Delayed Clearing, on the Moore 345 kV end of Moore-103rd & Rokeby 345

Stable


kV

Fault-2014-15L-MS-CATD_11 3-phase fault Tulsa SE 138 kV bus tie CB (#1345B) and clear entire station

Stable

Fault-2014-15L-MS-CATD_12 3-phase fault Tulsa PS 138 kV bus tie CB (#1349B) and clear entire station

Stable

Fault-2014-15L-MS-CATD_13 3-phase fault and trip Oneta 345 kV Station Stable

Fault-2014-15L-MS-CATD_14 3-phase fault and trip Oneta 138 kV Station Stable

Fault-2014-15L-MS-CATD_15 3-phase fault and trip Riverside 138 kV Station Stable

Fault-2014-15L-MS-CATD_16 3-phase fault and trip Pittsburg 345 kV Station Stable

Fault-2014-15L-MS-CATD_17 3-phase fault and trip Tulsa North 138 kV Station Stable

Fault-2014-15L-MS-CATD_18 3-phase fault and trip Valliant 345 kV Station Stable

Fault-2014-15L-MS-CATD_19 3-phase fault and trip Oklaunion - Lawton Eastside 345 kV with SPS failure

Stable


APPENDIX B - Results

Table 3: Unstable Events

EVENT Unstable Units

Owner Mitigation

20S-FFS-CATC_15 LPLFUTURE Lubbock Power and Light

Should this unit be installed as modeled, an operating guide will be

required as described in the results section of this

document


APPENDIX C – Outaged Branches

Table 4: NERC Category B, C, & D, FFS Outaged Branches

Event Bus Number Bus Name BaseKV Branch Outage

Power Flow, MW

Fault-2014-15L-FFS-CATB_20 659101 ANTELOP3 345 Branch 659101-659183 1 383

Fault-2014-15L-FFS-CATB_1 659131 LARAMIE3 345 Branch 659131-659135 1 277

Fault-2014-15L-FFS-CATB_2 510406 N.E.S.-7 345 Branch 509852-510406 1 504

Fault-2014-15L-FFS-CATB_3 507454 TURK 4 138 Transformer 507454-507455-507457 1 246

Fault-2014-15L-FFS-CATB_4 532797 WOLFCRK7 345 Branch 532794-532797 1 430

Fault-2014-15L-FFS-CATC_1 659101 ANTELOP3 345 Branch 659101-659183 1 383

Transformer 659101-659218 1 55

Fault-2014-15L-FFS-CATC_2 659131 LARAMIE3 345 Branch 659131-659135 1 277

Branch 659131-659133 1 188

Fault-2014-15L-FFS-CATC_3 652541 BIGBND24 230 Branch 652507-652541 1 188

Fault-2014-15L-FFS-CATC_4 510406 N.E.S.-7 345 Branch 509852-510406 1 504

Branch 510380-510406 1 261

Fault-2014-15L-FFS-CATC_5 507454 TURK 4 138 Transformer 507454-507455-507457 1 246

Branch 507454-508080 1 100

Fault-2014-15L-FFS-CATC_6 542982 IATAN 7 345 Branch 532772-542982 1 455

Branch 541400-542982 1 291

Fault-2014-15L-FFS-CATC_7 532797 WOLFCRK7 345 Branch 532794-532797 1 430

Branch 532791-532797 1 388

Fault-2014-15L-FFS-CATD_1 659101 ANTELOP3 345 Branch 659101-659183 1 383

Transformer 659101-659218 1 55

Transformer 659101-659212 1 42

Branch 659101-659105 1 39

Branch 659101-659105 2 39

Transformer 659101-659230 1 30

Branch 659101-659120 1 30

Fault-2014-15L-FFS-CATD_2 659131 LARAMIE3 345 Branch 659131-659135 1 277

Branch 659131-659133 1 188

Fault-2014-15L-FFS-CATD_3 532797 WOLFCRK7 345 Branch 532794-532797 1 430

Branch 532791-532797 1 388

Branch 532797-532799 1 367

Transformer 532797-533653 1 48

Fault-2014-15L-FFS-CATD_4 510406 N.E.S.-7 345 Branch 509852-510406 1 504


Branch 510380-510406 1 261

Branch 509807-510406 1 164

Fault-2014-15L-FFS-CATD_5 542982 IATAN 7 345 Branch 532772-542982 1 455

Branch 541400-542982 1 291

Transformer 541150-541350-542982 11 153

Fault-2014-15L-FFS-CATD_6 532766 JEC N 7 345 Branch 532766-532773 1 197

Branch 532766-532770 1 168

Branch 532765-532766 1 91

Transformer 532766-532806-532852 1 79

Transformer 532766-532805-532852 1 79

Transformer 532652-532766 1 0

Fault-2014-15L-FFS-CATD_7 507454 TURK 4 138 Transformer 507454-507455-507457 1 246

Branch 507454-508080 1 100

Branch 507428-507454 1 98

Branch 507454-508105 1 97

Transformer 507454-507456-507458 1 73

Fault-2014-15L-FFS-CATD_8 645451 S3451 3 345 Branch 645451-645459 1 121

Transformer 645451-646251-648251 1 102

Transformer 645451-646251-648351 1 102

Branch 635200-645451 1 101

Branch 645451-645454 1 91

Fault-2014-15L-FFS-CATD_9 512650 GRDA1 7 345 Branch 512650-512750 1 137

Branch 300740-512650 1 122

Transformer 512650-512656-512826 2 115

Transformer 512650-512656-512821 1 114

Branch 509852-512650 1 8

Fault-2014-15L-FFS-CATD_10 532853 LAWHILL6 230 Branch 532853-532856 1 141

Transformer 532853-532882-533250 1 118

Branch 532853-532855 1 85

Fault-2014-15L-FFS-CATD_11 549954 JTEC 5 161 Branch 549954-549960 1 97

Branch 549954-549969 1 65

Branch 549954-549961 1 38

Branch 300348-549954 1 33

Transformer 549891-549954 1 0

Fault-2014-15L-FFS-CATD_12 652509 FTRANDL4 230 Branch 652509-652526 1 100

Branch 652509-652565 1 56

Branch 640540-652509 1 21


Transformer 652509-652510 2 19

Transformer 652509-652510 1 19

Branch 652509-652516 1 5

Branch 652507-652509 1 0

Fault-2014-15L-FFS-CATD_13 652541 BIGBND24 230 Branch 652507-652541 1 188

Fault-2014-15L-FFS-CATD_15 509807 ONETA--7 345 Branch 509782-509807 1 252

Transformer 509806-509807-509874 3 207

Transformer 509806-509807-509881 1 202

Branch 509745-509807 1 199

Transformer 509806-509807-509868 2 199

Fault-2014-20S-FFS-CATB_51 507789 STLGENS4 138 Branch 507711-507789 1 506

Fault-2014-20S-FFS-CATB_52 659332 WATFRDCMBC4X 230 Branch 652216-659332 1 294

Fault-2014-20S-FFS-CATB_53 652540 BIGBND14 230 Branch 652507-652540 1 259

Fault-2014-20S-FFS-CATB_54 547503 RIV452T 5 161 Branch 547469-547503 1 210

Fault-2014-20S-FFS-CATB_55 547501 RIV453 5 161 Branch 547501-547503 1 210

Fault-2014-20S-FFS-CATB_56 533422 HEC U4 3 115 Branch 533413-533422 1 161

Fault-2014-20S-FFS-CATB_1 659131 LARAMIE3 345 Branch 659131-659135 1 330

Fault-2014-20S-FFS-CATB_2 532766 JEC N 7 345 Branch 532765-532766 1 647

Fault-2014-20S-FFS-CATB_3 532852 JEC 6 230 Branch 532852-532861 1 347

Fault-2014-20S-FFS-CATB_4 542982 IATAN 7 345 Branch 542980-542982 1 540

Fault-2014-20S-FFS-CATB_5 523853 FINNEY 7 345 Branch 523097-523853 1 204

Fault-2014-20S-FFS-CATB_6 505502 TRUMAN 5 161 Branch 505502-541314 1 116

Fault-2014-20S-FFS-CATB_7 507454 TURK 4 138 Transformer 507454-507455-507457 1 189

Fault-2014-20S-FFS-CATB_8 547476 ASB349 5 161 Branch 532932-547476 1 86

Fault-2014-20S-FFS-CATB_10 659101 ANTELOP3 345 Branch 659101-659183 1 270

Fault-2014-20S-FFS-CATB_11 542981 LACYGNE7 345 Branch 542968-542981 1 757

Fault-2014-20S-FFS-CATB_13 532797 WOLFCRK7 345 Branch 532794-532797 1 458

Fault-2014-20S-FFS-CATC_1 659131 LARAMIE3 345 Branch 659131-659135 1 330

Branch 659131-659133 1 240

Fault-2014-20S-FFS-CATC_2 507789 STLGENS4 138 Branch 507711-507789 1 506

Fault-2014-20S-FFS-CATC_3 652216 WATFORD4 230 Branch 652216-652400 1 207

Branch 652216-659302 1 47

Fault-2014-20S-FFS-CATC_4 659332 WATFRDCMBC4X 230 Branch 652216-659332 1 294

Fault-2014-20S-FFS-CATC_5 652540 BIGBND14 230 Branch 652507-652540 1 259

Fault-2014-20S-FFS-CATC_6 547501 RIV453 5 161 Branch 547501-547503 1 210

Fault-2014-20S-FFS-CATC_7 547503 RIV452T 5 161 Branch 547469-547503 1 210

Fault-2014-20S-FFS-CATC_8 533422 HEC U4 3 115 Branch 533413-533422 1 161

Fault-2014-20S-FFS-CATC_9 505502 TRUMAN 5 161 Branch 505502-541314 1 116

Branch 300071-505502 1 45

Fault-2014-20S-FFS-CATC_10 532766 JEC N 7 345 Branch 532765-532766 1 647


Branch 532766-532767 1 491

Fault-2014-20S-FFS-CATC_11 542982 IATAN 7 345 Branch 542980-542982 1 540

Branch 532772-542982 1 444

Fault-2014-20S-FFS-CATC_12 531445 GRDNCTY3 115 Branch 531445-531480 1 96

Branch 531445-531448 1 48

Fault-2014-20S-FFS-CATC_13 532852 JEC 6 230 Branch 532852-532861 1 347

Branch 532851-532852 1 285

Fault-2014-20S-FFS-CATC_14 542981 LACYGNE7 345 Branch 542968-542981 1 757

Branch 542965-542981 1 563

Fault-2014-20S-FFS-CATC_15 522870 LP-HOLLY 6 230 Branch 522861-522870 1 210

Branch 522870-526337 1 198

Fault-2014-20S-FFS-CATC_16 547476 ASB349 5 161 Branch 532932-547476 1 86

Branch 547476-547491 1 71

Fault-2014-20S-FFS-CATC_18 523853 FINNEY 7 345 Branch 523097-523853 1 204

Fault-2014-20S-FFS-CATC_19 507454 TURK 4 138 Transformer 507454-507455-507457 1 189

Branch 507428-507454 1 140

Fault-2014-20S-FFS-CATC_20 659101 ANTELOP3 345 Branch 659101-659183 2 270

Branch 659101-659183 1 247

Fault-2014-20S-FFS-CATC_21 645458 S3458 3 345 Branch 645458-650189 1 413

Branch 645456-645458 1 368

Fault-2014-20S-FFS-CATC_22 532797 WOLFCRK7 345 Branch 532794-532797 1 458

Branch 532791-532797 1 402

Fault-2014-20S-FFS-CATC_27 659105 LELANDO3 345 Branch 659105-659160 1 148

Transformer 659105-659106-659201 1 128

Fault-2014-20S-FFS-CATD_1 532766 JEC N 7 345 Branch 532765-532766 1 647

Branch 532766-532767 1 491

Branch 532766-532770 1 303

Fault-2014-20S-FFS-CATD_2 542981 LACYGNE7 345 Branch 542968-542981 1 757

Branch 542965-542981 1 563

Branch 532793-542981 1 313

Fault-2014-20S-FFS-CATD_3 542982 IATAN 7 345 Branch 542980-542982 1 540

Branch 532772-542982 1 444

Branch 541400-542982 1 381

Transformer 541150-541350-542982 11 189

Fault-2014-20S-FFS-CATD_4 645458 S3458 3 345 Branch 645458-650189 1 413

Branch 645456-645458 1 368

Branch 645458-645740 1 210

Branch 640139-645458 1 191

Branch 541197-645458 1 144

Fault-2014-20S-FFS-CATD_5 532797 WOLFCRK7 345 Branch 532794-532797 1 458

Branch 532791-532797 1 402


Branch 532797-532799 1 251

Transformer 532797-533653 1 76

Fault-2014-20S-FFS-CATD_6 659101 ANTELOP3 345 Branch 659101-659183 2 270

Branch 659101-659183 1 247

Branch 659101-659120 1 120

Transformer 659101-659218 1 55

Transformer 659101-659212 1 42

Branch 659101-659105 1 38

Branch 659101-659105 2 38

Transformer 659101-659230 1 30

Fault-2014-20S-FFS-CATD_7 510396 N.E.S.-4 138 Branch 510385-510396 1 153

Branch 300795-510396 1 116

Branch 509843-510396 1 111

Branch 510384-510396 1 111

Branch 509864-510396 1 108

Branch 509860-510396 1 101

Branch 509817-510396 1 74

Branch 510396-510413 1 67

Fault-2014-20S-FFS-CATD_8 532852 JEC 6 230 Branch 532852-532861 1 347

Branch 532851-532852 1 285

Transformer 532766-532806-532852 1 18

Transformer 532766-532805-532852 1 18

Fault-2014-20S-FFS-CATD_9 507454 TURK 4 138 Transformer 507454-507455-507457 1 189

Branch 507428-507454 1 140

Branch 507454-508105 1 124

Branch 507454-508080 1 113

Transformer 507454-507456-507458 1 49

Fault-2014-20S-FFS-CATD_10 659131 LARAMIE3 345 Branch 659131-659135 1 330

Branch 659131-659133 1 240

Fault-2014-20S-FFS-CATD_11 547498 STL439 5 161 Branch 547483-547498 1 224

Branch 547470-547498 1 164

Branch 547483-547498 2 152

Branch 547469-547498 1 48

Fault-2014-20S-FFS-CATD_12 645451 S3451 3 345 Transformer 645451-646251-648251 1 201

Transformer 645451-646251-648351 1 200

Branch 645451-645459 1 61

Branch 635200-645451 1 55

Branch 645451-645454 1 54

Fault-2014-20S-FFS-CATD_13 652519 OAHE 4 230 Branch 652507-652519 3 94


Branch 652507-652519 4 94

Branch 652507-652519 2 92

Branch 652507-652519 1 92

Branch 652519-652521 1 75

Branch 652488-652519 1 50

Transformer 652519-652520-652589 1 41

Transformer 652519-652520-652589 2 41

Fault-2014-20S-FFS-CATD_14 507789 STLGENS4 138 Branch 507711-507789 1 506

Fault-2014-20S-FFS-CATD_15 522870 LP-HOLLY 6 230 Branch 522861-522870 1 210

Branch 522870-526337 1 198

Transformer 522865-522866-522870 1 92

Fault-2014-20S-FFS-CATD_16 510406 N.E.S.-7 345 Branch 510380-510406 1 270

Branch 509852-510406 1 180

Branch 509807-510406 1 18

Fault-2014-20S-FFS-CATD_17 549954 JTEC 5 161 Branch 549954-549960 1 202

Branch 549954-549969 1 152

Branch 300348-549954 1 76

Branch 549954-549961 1 25

Transformer 549891-549954 1 0

Fault-2014-20S-FFS-CATD_18 520948 HUGO PP4 138 Branch 520918-520948 1 118

Transformer 520948-521157-521189 1 107

Branch 520948-521036 1 99

Branch 510918-520948 1 67

Branch 520948-521079 1 49

Fault-2014-20S-FFS-CATD_19 652216 WATFORD4 230 Branch 652216-652400 1 207

Branch 652216-659302 1 47

Transformer 652216-652408-652472 1 19

Transformer 652216-652408-652471 1 19

Fault-2014-20S-FFS-CATD_20 532853 LAWHILL6 230 Transformer 532853-532882-533250 1 179

Branch 532853-532855 1 135

Branch 532853-532856 1 30

Fault-2014-20S-FFS-CATD_21 520999 MOORLND4 138 Branch 520201-520999 1 84

Branch 520999-521128 1 59

Branch 514788-520999 1 47

Branch 520957-520999 1 44

Branch 520848-520999 1 42

Branch 520999-521065 1 29

Transformer 520995-520999-521180 1 24


Branch 515785-520999 1 12

Fault-2014-20S-FFS-CATD_22 542995 MONTROS5 161 Branch 300071-542995 1 193

Branch 541317-542995 1 57

Branch 541245-542995 1 31

Branch 541207-542995 1 24

Branch 542969-542995 1 20

Fault-2014-20S-FFS-CATD_23 652441 GARRISN4 230 Branch 652441-652444 1 145

Branch 652441-652466 1 107

Transformer 652441-652442 1 54

Branch 652441-659106 1 1

Fault-2014-20S-FFS-CATD_24 541341 S.HARP 5 161 Branch 541341-541344 1 116

Branch 541341-542969 1 89

Branch 541207-541341 1 78

Transformer 541341-541343 1 16

Fault-2014-20S-FFS-CATD_25 659332 WATFRDCMBC4X 230 Branch 652216-659332 1 294

Fault-2014-20S-FFS-CATD_26 652540 BIGBND14 230 Branch 652507-652540 1 259

Fault-2014-20S-FFS-CATD_27 546653 NEARMAN5 161 Branch 546653-546654 1 79

Branch 546653-546656 1 40

Branch 546652-546653 1 39

Branch 546653-546669 1 26

Branch 546653-546669 2 26

Fault-2014-20S-FFS-CATD_28 531445 GRDNCTY3 115 Branch 531445-531480 1 96

Branch 531445-531448 1 48

Transformer 531254-531421-531445 1 32

Branch 531445-531476 1 24

Transformer 531258-531423-531445 1 4

Fault-2014-20S-FFS-CATD_29 547501 RIV453 5 161 Branch 547501-547503 1 210

Fault-2014-20S-FFS-CATD_30 547503 RIV452T 5 161 Branch 547469-547503 1 210

Fault-2014-20S-FFS-CATD_31 533180 TEC E 3 115 Branch 533180-533182 1 146

Transformer 533180-533448-533462 1 31

Branch 533180-533192 1 18

Branch 533180-533252 1 2

Fault-2014-20S-FFS-CATD_32 547476 ASB349 5 161 Branch 532932-547476 1 86

Branch 547476-547491 1 71

Branch 547476-547477 1 27

Fault-2014-20S-FFS-CATD_33 511437 COMANC-4 138 Branch 511437-511488 1 80

Branch 511437-511494 1 51

Branch 511437-511467 1 38

Fault-2014-20S-FFS-CATD_34 533422 HEC U4 3 115 Branch 533413-533422 1 161

Fault-2014-20S-FFS-CATD_35 505502 TRUMAN 5 161 Branch 505502-541314 1 116

Branch 300071-505502 1 45


Fault-2014-20S-FFS-CATD_38 523853 FINNEY 7 345 Branch 523097-523853 1 204

Fault-2014-20S-FFS-CATD_39 659105 LELANDO3 345 Branch 659105-659160 1 148

Transformer 659105-659106-659201 1 128

Transformer 659105-659106-659202 1 109

Branch 652506-659105 1 82

Fault-2014-20S-FFS-CATD_40 505460 BULL SH5 161 Branch 338123-505460 1 90

Branch 338813-505460 1 82

Branch 300081-505460 1 71

Branch 338120-505460 1 68

Branch 504440-505460 1 18


APPENDIX D: Plots and FFS Data

Generator responses showing the six (6) largest excursions for rotor speed, rotor angle, electrical

power, and reactive power output were plotted in .pdf format and posted on TrueShare at:

TWG >TPL Compliance Reports>2014 TPL Assessment>Stability Results

The raw results of the FFS Scans are also posted on the Trueshare Site.

spp 2014 tpl dynamic stability assessment

Documents