nerc spiderwg studies sub -group update planning...• studies sub-group status overview •...

NERC SPIDERWGStudies Sub-Group UpdatePeng Wang (IESO), Jameson Thornton (PG&E), Studies sub-group Co-leads NERC SPIDERWG Meeting, ComEd, Chicago, IllinoisOctober 8-9, 2019

RELIABILITY | ACCOUNTABILITY2 Internal

• Studies Sub-Group Status Overview• Individual updates of work items S1 update, by Jameson Thorntons (PG&E), Peng Wang (IESO) S2 update and walk through final draft of white paper, by Peng Wang (IESO),

Chelsea Zhu (National Grid) S3 update and walk through first draft of white paper, by Ian Beil (PGE) S4A update and S4B facilitated discussion, by Dan Kopin (Utility Services) S5 update, by Alicia Allen (Sargent & Lundy)

Studies Sub-group Session Outline


• 5 Strike teams proceeding in parallel• Updated schedule

Studies Sub-groupStatus Update Overview

Task Deliverable Expected Timeline Status

S1

Reliability Guideline: Bulk Power System Planning under Increasing Penetration of Distributed Energy Resources (SPIDERWG Priority)Guideline providing recommendations and industry practices for performing planning studies considering the impacts of aggregate DER behavior.

Q2-2020 On track – draft reliability guideline in development.

S2

Review of TPL-001 Standard for Incorporation of DER ((SPIDERWG Priority))Technical review of NERC TPL-001, and development of any recommendations pertaining to consideration and study of DER impacts to the BPS. Q4-2019

On track – draft white paper ready for SPIDERWG to review to be submitted to PCby end of the year.

S3

Recommended Simulation Improvements and TechniquesGuidance to software vendors on tools enhancements for improved accounting and study of aggregate DER. Q2-2020 On track – white paper in development.

S4a

Reliability Guideline: Recommended Approaches for Developing UnderfrequencyLoad Shedding Programs with Increasing DER PenetrationGuidance on how to study UFLS programs and ensure their effectiveness with increasing penetration of DER represented.

Q1-2020On track – draft reliability guideline in development, to be submitted to PC by end of the year.

S4b

Reliability Guideline: Recommended Approaches for Developing Undervoltage Load Shedding Programs with Increasing DER PenetrationGuidance on how to study UVLS programs and ensure their effectiveness with increasing penetration of DER represented.

Q3-2020Kicking off – started later due to higher priority of S4A and lack of expertise in team on UVLS.

S5

White Paper: Beyond Positive Sequence RMS Simulations for High DER Penetration ConditionsConsiderations for high penetration DER systems and the need for more advanced tools (e.g., co-simulation tools) for studying DER impacts on the BPS.

Q1-2020 On track – in relatively early stage.


Relationship Map of Work Items

S1 Bulk System

Planning with DER

S4A&S4BUFLS & UVLS

S5 Beyond Positive

Sequence

S2 TPL-001 Review

S3Simulation

Improvements

Other sub-groups


Strike Team Members

S1 S2 S3 S4A S5Jameson Thornton * Binaya Shrestha * Ian Beil * Dan Kopin * Ning Kang *

Peng Wang * Chelsea Zhu * Maryclaire Peterson AESO Ransome Egunjobi *

Binaya Shrestha Dan Kopin Byoungkon Choi ComEd Reigh WallingMaryClaire Peterson Peng Wang Ning Kang ConEd Alicia Allen

Deepak Ramasubramanian Jameson Thornton Deepak Ramasubramanian Entergy Deepak RamasubramanianTing Zhang Ting Zhang John Schmall ERCOT Nazila RajaeiNing Kang Keith Burrell Alicia Allen FERC Chetan Mishra

Nazila Rajaei Yu Zhang Nihal Mohan Hydro One Raul Perez GuerreroRansome Egunjobi Byoungkon Choi Binaya Shrestha Hydro Quebec Karthikeyan Balasubramaniam

John Schmall Ransome Egunjobi David Roop HydroOne Stephanie Schmidt

Rojan Bhattarai Ian Beil Chetan Mishra ISO New England Ian Beil

Chelsea Zhu Chris Pink Keith Burrell MISO Rojan BhattaraiKannan Sreenivasachar Raul Perez Guerrero Bo Gong National Grid Mohit Singh

Kevin Dowling Stephanie Schmidt Stephanie Schmidt NERC Sirisha Tanneeru

Sirisha Tanneeru NYISO

Stephanie Schmidt OncorPacifiCorp

PG&ESargent & Lundy

SPP

* Leads of each team


• Updates In the July meeting, the team presented the 3-chapter structure and the

first 3 drafted mini-guidelines: thermal with high output of DER and reverse flow, high voltage, and frequency response. Also sent to Studies sub-group for review.

Received comments on the 3 drafted mini-guidelines. Team updated the draft mini-guidelines accordingly.

Continued to develop mini-guidelines of 3 new types of studies, steady state voltage stability, delayed voltage recovery, and transient stability. All mini-guidelines are following similar structure as before – base case/study scenarios, study assumptions and methodology, and potential solutionso Ting Zhang (AESO) and Maryclaire Peterson (Entergy) developed first draft of steady state

voltage stability mini-guideline, which is being reviewed by S1 team now. The other two sections are in development.

Developed survey questions from Studies sub-group in coordination with other sub-groups. The complied survey will be sent to SPIDERWG members in Q4 2019.

S1 Reliability Guideline: Bulk Power System Planning with Increasing DER Penetration


PROGRESS

TASK Not Started Drafting S1 Team Review

Studies Sub-group Review

Responses &Updates to Comments

Final draft *

Steady StateThermal - tripping of DERThermal – high output of DER and reverse flowHigh voltageLow voltagesSteady state voltage stabilityStabilityDelayed voltage recovery Frequency response Transient stabilityOther IssuesTransfer capabilityUFLS (S4A deliverable) **UVLS (S4B deliverable) **Potential tripping due to reverse power relay activationRelay loadability Short circuit issues Issues caused by phase imbalance (S5 deliverable) *** Further updates might be made in later stage of S1 document development, including SPIDERWG review.** Progress shown in this table only refers to sections in S1 document. S4 and S5 team have been progressing in parallel and their findings will be inputs to corresponding sections in S1 document.

S1 Reliability Guideline: Bulk Power System Planning with Increasing DER Penetration (cont.)

Status of mini-guidelines in Chapter 3


• Next step Mini-guidelines will continue to be developed for remaining list of

impacts/studies. All new mini-guidelines will be reviewed within S1 team and then sent to

Studies sub-group to review. Highlights will be presented in in-person meetings.

Overview and general consideration chapters will be further enhanced with inputs from individual mini-guidelines.

Review and analyze survey results to enhance the S1 document (e.g. references, example cases, DER impacts, study methodologies, etc.)

S1 Reliability Guideline: Bulk Power System Planning with Increasing DER Penetration (cont.)


S2 Review of TPL-001 Standard for Incorporation of DER

• Updates Back in the July in-person meeting, S2 team presented findings from TPL-001 review Since then, S2 team has developed draft white paper of TPL-001 review based on

these findings. Expanded discussions where needed to support these findings, such as why the requirement/sub-requirement is relevant to DER, why language doesn’t preclude DER, why certain language is not clear, and recommendations for PC’s consideration.

Will present the draft white paper today and send it for the SPIDERWG to review after the meeting.

• Next step SPIDERWG review the draft white paper by end of October. S2 team will update the white paper based on comments in November, and aim to

send final version to PC in November or December. Depending on PC’s decision, either support the development of SAR for language

change, or develop guidance as needed.


• Definition of “Load” as part of the system peak Load Existing definition of Load is gross load. With consideration for DER, what’s relevant for planning study is net Load. Should the language be changed to peak Demand?

• “generators” or “generating unit” No existing definition. Do these include DER as well? Performance requirement for DER in 4.1.

• Contingency List Should the contingency list include outage of DER as generator outage contingency? Should it only include U-DER as these are relatively larger in size and in most cases are

connected directly to distribution bus and are modeled as a individual generator? Should other events based upon operating experience that may result in wide area

disturbances, such as cloud cover, be added as extreme events to consider for TPL study?

S2 Outstanding Items Seeking Special Attention from the SPIDERWG


• Updates Developed an outline of the topics to be covered in the software vendor

recommendations document. We have taken those topics and collaborated on a draft version of the White Paper.

Will walk through the first draft today and seek inputs.

• Next steps The draft White Paper will be ready for distribution to the full SPIDERWG in

October. We will solicit comments from the wider SPIDERWG over the next several

months, and shoot to have a more polished version of the document available by the Q1 2020 in-person meeting.

We will also work specifically with the S5 team to get a brief section on Co-Simulation tools included in the S3 document

S3 Recommended Simulation Improvements and Technique


• Updates of S4A UFLS Reliability Guideline Back in the July in-person meeting, resented findings and recommendations

from draft S4A UFLS reliability guideline. Completed ISO New England’s case study Furthered discussions on Recommendation section Hawaii Electric Light case study on adaptive UFLS is in process

• Next steps of S4A UFLS Reliability Guideline Expect to complete the Hawaii Electric Light case study by end of October Update and complete Recommendations section by end of November

S4B to be kicked off. Will have a discussion today on the impacts of DER on UVLS and RAS with the entire SPIDERWG and solicit volunteers.

S4 Reliability Guideline: UFLS/UVLS Programs with Increasing DER Penetration


• Undervoltage Load Shedding Program

• Remedial Action Scheme (Centrally Controlled)

S4B Reliability Guideline: UVLS Programs with Increasing DER Penetration


• 2003 Blackout Report: “before August, 2003, shedding 1,500 MW of load in that area before the loss of the Sammis-Star line might have prevented the cascade and blackout.”

• 2011 Potential Bulk System Reliability Impacts of Distributed Resources

“If the quantity of DER is large enough to actually result in export to the bulk power system, isolation of the circuit as part of a load shed scheme could result in increasing, rather than reducing, system demand. Under-voltage load shed schemes may need to be revised to take into account the effect of loss of DER during low-voltage events.”

S4B Reliability Guideline: UVLS Programs with Increasing DER Penetration (cont.)


• Is DER currently embedded within load designed to be shed in service of UVLS or a RAS?

• Will undervoltage load shedding and remedial action schemes remain effective as high levels of DER are integrated?

• Does SPIDER WG agree with this slide from SERC (2017)?

S4B Reliability Guideline: UVLS Programs with Increasing DER Penetration (cont.)


• Updates Developed skeleton document with initial outline and main bullets of each

chapter• Definition of Beyond Positive Sequence• Identification of issues and deficiencies that need beyond positive sequence tools• Survey of existing and ongoing tools that addresses identified challenges and their

inherent limitations

Assigned each chapter to volunteers to develop first draft Initial draft for chapter 1 and 2 to be developed by October in-person

meeting ( work in progress) Presentation of tables showing existing software tools and their limitations

• Next steps Complete initial draft of all chapters Time line is March 2020

S5 Beyond Positive Sequence RMS Simulations for High DER Penetration Conditions

nerc spiderwg studies sub -group update planning...• studies sub-group status overview •...

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