PWG Review Summary Committee Report...BAL-002-WECC-2 Field Trial • WECC SAR-0115 –Don Badley...

PWG Review Summary

James Wells – PWG Chair

W E S T E R N E L E C T R I C I T Y C O O R D I N A T I N G C O U N C I L

PWG Action Item Tracking

• New form for tracking action items developed

• Working with WECC IT to create location for easy access

2


New drop down for action items

BAL-004-0 Retirement• NAESB is process of retiring WEQ-006 Manual TEC Business Practice

Standard. Filed termination request and justification to FERC.

• FERC is evaluating, no timetable for review to be complete

• NERC to publish formal communication and transition regarding elimination of manual time error correction

• Peak RC clocks upgraded and ready to capture larger accumulated TE.– Peak RC can transmit accumulated TE via ICCP if needed by entities

• Delta TE still required to be tracked for WI BAL-004-WECC-2 ATEC

3


WECC-0124 SAR Status• BAL-004-WECC-3

• Reduced scope:– Strong concern/opposition to reducing PII accumulation limits

– SAR only addressing R1 regarding PII reconciliation to WIT tool

• WECC Board disposition on December 5th

• NERC Board of Trustees adopted on BAL-004-WECC-3 February 8th

• Waiting for FERC approval

• PWG going to do outreach to BAs to ensure they are aware of requirement to reconcile PII data to WIT

4


BAL-002-WECC-2 Field Trial

• WECC SAR-0115– Don Badley retirement opens chair position for drafting team

• Field Test planned for 1 year data collection – Field Test set to end April 29, 2018

• 52 DCS events since implementation of Field Test (May 1, 2017)– 100% pass rate of DCS events

5



Entity ## DCS Events

Average Loss (MW)

Average Contingency

Reserve Obligation (MW)

Average Spin (MW)

% Pass

Entity 1 3 748 1033 1297 100%

Entity 2 4 506 559 395 100%

Entity 3 4 505 636 1245 100%

Entity 4 0 N/A N/A N/A 100%

Entity 5 41 636 3916 7097 100%

6


BAL-002-WECC-2 Field Trial• Entities have been carrying over 50% of MSSC as spinning

reserve (during reportable disturbances)– This does not necessarily mean entities have been carrying 50%

spinning reserve at all times

– Spinning reserve may be carried for other reasons• BAL-001-2 RBC

• BAL-003-1.1 FRO

• Variable based generation resources

• Concern the field test data could be misinterpreted in efforts to retire the BAL-002-WECC-2 R2

7



• Beginning to explore other data in support or R2 retirement

• Meet with Shanon Black to determine next steps

• Field Trial end or extend while pursuing to retire BAL-002-WECC-2 R2

• Provide an update and roadmap forward to be given to WECC OC at upcoming March 20th meeting

8


BAL-003-1.1 SAR

• NERC RS SAR

• NWPP SAR

• Identifies potential reliability gaps in standard– Real Time Reliability

– Event Selection

– Measurement

– Assumptions behind the standard

9


BAL-003-1.1 SAR10


BAL-003-1.1 SAR

• NERC BAL-003 SAR Drafting team formed

• Developing SAR to combine two existing proposals and address comments

• Outcome Single SAR to go to standards committee.

• Drafting team request expected around April timeframe

ADI

• There is some concern/question whether entities are appropriately accounting for ADI in control performance

• PWG developed a set of questions, but will utilize ADI Operating group administrator and address responses that could potentially be out of line with compliance standards:

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ADI

• Questions:– When the monthly CPS1 and BAAL scores are calculated, do the ACE values

that were used include the addition of any offsets from ADI? (Yes)

– When frequency response measure is calculated, do the NAI values that were used include the addition of any offsets from ADI? (No)

– When area load (i.e. generation minus NAI) is calculated, do the NAI values that were used include the addition of any offsets from ADI? (No)

12


PII – Alberta Islanding

• PII = (1-Y) * (IIactual - Bi * ΔTE/6)

• Alberta Islanded from the Western Interconnection starting October 2nd to October 6th

• Even though Alberta NAI and NSI were 0– WIT did not recognize them as being islanded

– Due to the bias term in PII, Alberta erroneously accumulated PII

13


PII – Alberta Islanding• Retroactive Fix:

– Investigating with OATI technical feasibility to go into WIT and change bias to 0MW/0.1Hz for all hours when islanded• Preferred Method by PWG WIT will automatically recalculate Primary Inadvertent

accumulation

– Investigating with OATI technical feasibility to go into WIT and implement month end correction to PII only

• Corrective Action Going Forward:– Even though Alberta uses a fixed bias, they are going to investigate

capability of sending fixed bias hourly via EIDE protocol where dispatchers could update bias in real time to 0 when islanded

14


PII – Alberta Islanding

• Bigger Question:– Primary Inadvertent has interconnection bias component

– Interconnection bias is not constantly re-calculated even though there are variable bias entities in WECC submitting hourly bias data to WIT

– PWG is in discovery phase and will evaluate if WIT changes should be made

15


Patterns of Frequency Deviation• PWG is evaluating time of day patters for frequency deviation

– Appears to mimic PV solar production with distinct increases or decreases in frequency during solar ramps

• PWG will be exploring these trends further and with more depth– Solar generation

– Wind generation

– ACE

– Inertia (Wester Interconnection, Southern Area vs Northern Area)

16


Patterns of Frequency Deviation17


59.9700

59.9750

59.9800

59.9850

59.9900

59.9950

60.0000

60.0050

60.0100

60.0150

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

Annual & Seasonal Frequency Pattern by Hour of the Day

Annual Dec-16 thru Feb-17 Mar-17 thru May-17 Jun-17 thru Aug-17 Aug-16 thru Nov-16

Momentary Cessation18


• FNet data from the October 9th "Canyon 2" 500kV fault event that tripped about 900 MW's of Inverter Based PV resources

• Fairly "small" event that had a fairly large effect on frequency– Large amount of frequency disparity across the interconnection

• San Diego Area trace demonstrates the effect of rapid return of PV as dictated by the new guideline post Bluecut Fire

Momentary Cessation19


59.75

59.8

59.85

59.9

59.95

60

60.05

60.1

19:14:09.6 19:14:18.2 19:14:26.9 19:14:35.5 19:14:44.2 19:14:52.8 19:15:01.4 19:15:10.1 19:15:18.7 19:15:27.4

Freq

uen

cy

Time

Calgary Frequency

San Diego Frequency

Centralia Frequency

Burbank Frequency

Sacramento Frequency

Montana Frequency

Brier (WA) Frequency

Layton (UT) Frequency

Portland Frequency

Las Cruces Frequency

Golden (Co) Frequency

PDCI Event Analysis20


• PDCI Blocks:– Time Assessed: January 1, 2017 to February 23, 2018

– 35 Total Incidents

– 27 Restored on Auto Restarts (cycles)

• Evaluate schedule cuts with respect to PDCI trips– Frequency, PDCI Power Order, PDCI Schedules, ACE

PDCI Event Analysis

• Q1 & Q2 2017 LADWP had ongoing work replacing the 34.5kV grounding electrode – Resulted in limited ground current capability

– Required faster ramping following loss of pole to reduce ground current

21


04/06/2017 22:5222


59.65

59.7

59.75

59.8

59.85

59.9

59.95

60

60.05

60.1

0

500

1000

1500

2000

2500

3000

3500

22:48:00 22:55:12 23:02:24 23:09:36 23:16:48 23:24:00 23:31:12

Fre

qu

en

cy (

Hz)

PD

CI

Act

ual

an

d S

che

du

led

Flo

w (

MW

)

4/6/2017 22:52

PDCI Actual Flow

PDCI Scheduled Flow

AGCdb Actual Frequency



59.65

59.7

59.75

59.8

59.85

59.9

59.95

60

60.05

60.1

0

500

1000

1500

2000

2500

3000

3500

5:09:36 5:16:48 5:24:00 5:31:12 5:38:24 5:45:36 5:52:48

Fre

qu

en

cy (

Hz)

PD

CI

Act

ual

an

d S

che

du

led

Flo

w (

MW

)

6/16/2017 5:14

PDCI Actual Flow

PDCI Scheduled Flow




59.75

59.8

59.85

59.9

59.95

60

60.05

60.1

0

500

1000

1500

2000

2500

3000

10:33:36 10:40:48 10:48:00 10:55:12 11:02:24 11:09:36 11:16:48

Fre

qu

en

cy (

Hz)

PD

CI

Act

ual

an

d S

che

du

led

Flo

w (

MW

)

6/23/2017 10:40

PDCI Actual Flow

PDCI Scheduled Flow


2/17/2018 16:3325


59.9

59.95

60

60.05

60.1

0

500

1000

1500

2000

2500

16:26:24 16:33:36 16:40:48 16:48:00 16:55:12 17:02:24 17:09:36 17:16:48 17:24:00 17:31:12 17:38:24

Fre

qu

en

cy (

Hz)

PD

CI

Act

ual

an

d S

che

du

led

Flo

w (

MW

)

02/17/18 16:33

PDCI Actual Flow

PDCI Scheduled Flow


PDCI Event Analysis

• Events post grounding electrode upgrades have not resulted in extended suppressed frequency

• Seeing improved timing between actual flow/power order reductions and schedule cuts occurring

• Ongoing review will be performed for PDCI trips

• LADWP, BPA, and CAISO have ongoing meetings to discuss impact of PDCI as Balancing Contingency Event for importing BA and improving control performance following PDCI trip

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ERSWG Measures

• Essential Reliability Service Work Group Measures– Voltage Control

– Frequency Response

– Load and Resource Balancing

– Inertia

• Trends over time as generation portfolio changes

• Net Ramp and Demands Curves

• Rate of Change of Frequency (RoCoF)

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ERSWG Measures28


• Goal is not to create more work, but to interpret/validate what NERC is doing

• Make sure we can advise EPAS and OC how control performance is trending

WECC Performance Charts29


Accumulated TE Trend30


Number of TE Corrections31


Duration of TE Correction (Hours)32


On and OFF Peak ABS33


Interconnection Ave CPS1 Trend34


BAAL Exceedance 10-14 min35


BAAL Exceedance 15-19 min36


BAAL Exceedance > 20 min37


PWG Review Summary Committee Report...BAL-002-WECC-2 Field Trial • WECC SAR-0115 –Don Badley...

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