IEEE SCC21 1547 Standards Development - IEEE-SA -...

IEEE SCC21 P1547 Working Group Meeting Minutes, June 1-3, 2015, Waltham, MA

“P1547 Draft Standard for Interconnection and Interoperability of Distributed Energy Resources with Associated Electric Power Systems Interfaces”

Chair: Thomas Basso

Vice Chairs: John Berdner, Jim Daley, Babak Enayati, and Mark Siira

Secretary/Treasurer: Charlie Vartanian

The fifth meeting of the P1547 Working Group (WG) was held in Waltham, MA, on June 1-3, 2015, at National Grid’s Reservoir Woods facility. The targeted outcomes for the meeting were to review the latest proposed edits for creation of P1547/Draft 2, and receive direction from WG for each subgroup going forward.

Summary highlights. Each subgroup presented its latest proposed draft edits and other progress since the last WG meeting. The attendees responded to straw man (show of hand) votes on specific technical alternatives for text for draft 2, and to provide other direction to the subgroups for next iteration of draft updates and work going forward. The input and guidance received by the subgroups will be incorporated into updated edits for creation of draft 2, which will be finalized following this meeting and then posted to CDT. Subgroups will continue to hold their webinars and telecons, and the P1547 Officers will continue to have telecons to track overall progress. The WG decided on October 27-29, 2015 for the next WG meeting in Tempe AZ; facilities sponsored by Salt River Project (SRP).

Monday, June 1, 2015, day 1

Meeting called to order and introThe meeting was called to order at 8:30am. Attendees (Attachment A) were welcomed by Tom Basso, Chair of IEEE P1547. Tom thanked National Grid for sponsoring the meeting facilities. Babak Enyati of National Grid welcomed the attendees and provided meeting room and building logistics information.

Tom presented the agenda for the meeting (Attachment B slides), received WG approval of the prior meeting minutes, reviewed planned activity for the next several days, and had the P1547 Officers introduce themselves.

Tom presented the introductory slides and made a call for potentially essential patents. No potentially essential patent claims were declared, and no holders of potentially essential patents were identified. Attendees then introduced themselves and their affiliations.

Charlie reviewed the current P1547/Draft1 document highlighting the subclauses that have been edited for creation of Draft 1. Results were reported for the online poll on clause 1.3 Limitations, which was an action item from the February 2015 WG meeting. The poll results call for P1547 clause 1.3:

1) elimination of any specified DER capacity limit, and 2) to not state any representative value for P1547 distribution primary voltage level.

Preview of DRAFT 2 edits and issues for further development The remainder of Day 1 was spent with each subgroup providing their work status, a preview of the latest Draft edits, and any issues they will cover in detail tomorrow.

Minutes—P1547 Meeting, June 1-3, Waltham

Folder 4, Interoperability, Mark SiiraMark gave his status update using a presentation. Despite some significant individual efforts by several team members to develop a draft, a consensus draft was not achieved prior to the meeting, proposed draft edits for 4.1.6 were not agreed upon at subgroup level. Therefore, no proposed edits were presented. Mark presented his slides, and then asked the meeting participants to identify the top three requirements for the monitoring and control of DER. The floor was opened for comment, and each person was offered the chance to provide feedback. Recap of key input follows.

DER should report: 1) On or Off Status 2) Energy output, 3) Ability and availability to change status; additionally:

o recommendation to add expansion to reporting of status. If off, provide the reason. It could limit ability to come back online, e.g. off due to high line voltage, thermal or other limit exceeded within DER unit, etc

o agreed with the three above, but also add reporting of monitored line voltageo output reporting should include both real and reactive powero numerous other attendees voiced support for these three basic metrics.

Consider communication system operability during abnormal condition. For example, if grid is offline, can DER communications still work? Is there a minimum requirement to operate during abnormal conditions?

Whatever requirements are selected, the “deminimus” 3-4 metrics should be identified as required

In addition to the deminimus, the “nice to have” metrics should be included. In particular in context of the data/info exchange required to implement specific use cases

Another variation to the three DER report items: in addition to reporting ability to come on line (return from off to on), report the kW available to come online

Report power factor (note, similar to reporting real and reactive) The DER should have ability to load operating profiles Inverters should report operating mode. Current injection or voltage source. Standard information models should be required. Leave latitude on what is reported, but require

that the information is provided in a common standard format. Standard communications protocols should be required NERC CIP must be considered (some group discussion of generalizing vs citing NERC) MIC must allow for aggregation. Need an abstraction layer on line side of PCC. Could be multiple entities interfacing with DER.

(analog of aggregation on the DER side). DER should receive permissive signal that it is OK to connect to EPS. DER should provide a

feedback signal indicating if it is online. DER should also provide operating metrics in its feedback signal.

Reiterated need for standard info models and comms protocols Guidelines on frequency of the communication exchange by the DER. Should the frequency

correlate to capacity: infrequent for small systems, all the way to near real time for very large systems?

Provide some guidance on minimum required physical comms infrastructure Comment was made that 1547.1a Clause 5 provides guidance on minimum comm requirements

in context of testing.

Mark outlined the folder 4 approach to keeping the requirements and the most important supporting content in the body of 1547, and placing informative and useful info in an informative Annex to 1547.


Folder 5, Special Interconnections, Charlie VartanianDistribution secondary networks Charlie displayed the proposed edits that Mike Coddington and his Networks subgroup have developed for Draft 2. Charlie highlighted that the latest edits combine those requirements common to both Secondary and Spot networks, and that the subclause specific to those network scenarios are intended to just include requirements specific to both spot or secondary networks. The edits were identified as being posted on CDT, and WG was invited to review them and provide Mike feedback.

Intentional islands Leo gave a presentation on this topic. The presentation included his subgroup’s latest redline edits for 1547 Draft 2. Leo posed the following questions and facilitated group discussion in response,

Should unintentional island subclause be expanded. Should other means of implementing Intentional Islanding be considered in the revision. WG consensus was yes, for considering this within Leo’s activity/team.

Should the standard use the term microgrid versus intentional island? No clear consensus on terminology, but consensus that this is a question his team should address. One caution on extending scope of 1547 to “community” microgrids, that generally include a portion of the EPS in the defined island.

Additional discussion posed the idea that modeling and simulation may be an option to supplement physical testing of an island for interconnection impacts and compliance

Jens B. recommended that the next WG meeting include an agenda item on the topic of Modeling & Simulation.

Chair prompted discussion of other special interconnection topics that have been identified, but are not currently being addressed. These include energy storage and grid-interactive EV’s.

Taylor Hollis volunteered to facilitate a study group on the topic ES. The plan is to start this work within the Special Interconnection Folder. The initial questions include – is ES adequately covered in 1547, if not what pursuits are recommended.

Folder 2, General Requirements, Voltage Regulation, Babak EnayatiBabak displayed the “clean” version of his subgroup’s proposed edits for Voltage Regulation. The clean and redline edits for Voltage Regulation are posted on CDT. Babak and Aminul then provided a preview of the material for the detailed working session planned for tomorrow during the Day 2 meeting.

Folder 3, General requirements, Response to abnormal conditions, John BerdnerJens Boemer and John provided an overview of the work by the Folder 3 subgroup. A summary presentation from slides was given by Jens, to provide broad overall status using ‘green yellow red’ light rankings. The slides are posted on CDT, file “01_IEEE P1547_SubGroupIII_Clause4 2_Overview on progress_2015-06-01_FINAL (JSB).pdf”.

One highlighted issue was the need to coordinate the Categories (XYZ and I, II, III) across the Folder 2 V-Regulation edits and the Folder 3 ride through edits to 1547.

The day 1 meeting was adjourned at 4:45pm.

Tuesday, June 2, 2015, day 2Meeting called to order and introDay 2 to of the meeting was called to order at 8:30am. Babak welcomed the attendees to National Grid.


Charlie covered admin items. He noted the changes for tomorrow’s Day 3 agenda: addition of 1) review Folder 4 proposed Draft 2 edits and 2) opening discussion of the Energy Storage topic, to be facilitated by Taylor. Modified agenda shown in Appendix B below. The WG was also given advance notice that we’d have a straw poll tomorrow to choose dates for our next working group meeting, this fall at Salt River Project (SRP), Arizona. The admin items ended with an invitation for new attendees to introduce themselves, and request for everyone to initial the sign in sheet, each day.

The remainder of the Day 2 was used for detailed discussion of proposed edits and open issues for Folder 2’s Voltage Regulation, and Folder 3’s Ride Through topics.

Folder subgroup discussion of proposed draft 2 edits

Folder 3, General requirements, Ride through, John BerdnerJohn, Jens and Reigh co-presented an overview of their draft edits and framed several open issues in need of WG feedback.

They worked from both their summary presentation slides and their proposed Draft 2 edits, prepared for this meeting, and made edits directly during this interactive session. The initial file showing the latest proposed edits for Voltage and Frequency Ride Through is posted on CDT, file “D IEEE P1547-D1_Input from F3 GR2-Clause 4 2_EndConfCall-May14.docx”.

The floor was opened for questions and comments from the WG meeting attendees. The following recaps key points the co-presenters noted on the easel board sheets.

Question was asked “what is the reference voltage?” Presenters pointed out that 1547 doesn’t designate the reference (RMS, highest phase, etc. and, at this point neither does the revision. This remains an open issue for consideration if a reference is needed and what it should be. Post-meeting note: see 1547 clause 4.2.3 Voltage -- The protection functions of the interconnection system shall detect the effective (rms) or fundamental frequency value of each phase-to-phase voltage, except where the transformer connecting the Local EPS to the Area EPS is a grounded wye-wye configuration, or single-phase installation, the phase-to-neutral voltage shall be detected. When any voltage is in a range given in Table 1) …

Meeting feedback on reference voltage options for P1547 full revision included: o line-line/3-phaseo RMS/fundamental

positive sequenceo Most severe phaseo Crest voltage o Average of three phases, with ground phase restriction (circulating current for 3 wire,

neutral return for 4 wire system) possibly incorporated Need to clear up default “setting” values being equated with “clearing times”

o Comment for WG – consider one harmonized table for minimum trip and ride through Some DER can’t sustain max P at lower frequency. May need to include consideration of power

vs frequency limitationso Co-presenters highlighted that the subgroup has not yet gotten into operational details.

but, an operation aspect could consider an allowable derate during system frequency excursion events


Need to correct typo in default settings for UV2 in category Z The word “must” should be changed to “shall” in the several category X, Y, and Z tables. Per

IEEE Standards’ terminology.

Jens led discussion of category X, Y, and Z. Expanded on the presentation slide which gave a qualified characterization of the three Categories,

X, minimum for base level reliability that all DER should meetY, is more stringent and addresses bulk system ‘NERC’ type reliability requirementsZ, is even more stringent, and addresses aggressive distribution scenarios like high PV

penetration

Action item. Folder 3 subgroup’s meeting revised voltage ride through and frequency ride through draft 2 edits to be sent to the WG secretary within 3 weeks following the meeting.

Folder 2, General Requirements, Voltage Regulation, Babak EnyatiBabak and Aminul co-presented an overview of their draft edits and framed several open issues in need of WG feedback. Aminul led discussion on proposed Draft 2 edits for Voltage Regulation. The initial file showing the latest proposed edits for Voltage Regulation is posted on CDT, file “Draft Input for Voltage Regulation section in the 1547 Full Revision_ver28_ 05222015_Clean Version.docx”.

The floor was opened for questions and comments. The following recaps key points and results of several ‘show of hand’ polls.

Show of hands affirmed to remove “lifespan” from opening statement in 4.1.2.1. o Follow-on discussion led to significant edits to the opening statement; captured as

redlines to the initial draft 2 edits. Feedback was requested on need for addressing tolerance in context of voltage regulation

requirement. o Tolerance was intentionally left out of 1547 o 1547.1 (test procedures) addresses tolerance per manufacturer’s stated specificationo An attendee stated IEC standards do address (mandated values?) tolerance

A show of hands indicated preference for using the “points” graphical form rather than equation form for showing the VAR response/characteristic curve for each respective mode (27 votes for points format, and 10 votes for equation format).

Inputs were requested on the draft values for the ‘points’, V1, V2, Q1, Q2, etc.. The input was discussed and any changes to proposed edits were made as “redlines” to the starting proposed draft 2 edits for V-regulation. The discussion was extensive. Decision was made to use part of Day 3 to continue the V-Regulation discussion.

The day 2 meeting was adjourned at 4:45pm.

Wednesday, June 3, 2015, day 3

Meeting called to order 8:30 a.m. and intro.

A show of hands poll was taken on 1) WG availability and 2) preference for the dates of the next working meeting. An attendee confirmed October sponsorship by the Salt River Project (SRP), Tempe AZ. Poll results affirmed the dates for our next meeting as October 27-29, 2015.


The remainder of the day was used for: an activity status update by folder 6 Testing; continuation of detailed discussion of proposed edits for folder 3 Voltage regulation and folder 4 Interoperability; and to discuss next actions.

Folder 6, Testing, Jim DalyJim’s status report was that active work to create testing related revisions to 1547 are waiting on the ride through and voltage regulation requirements being firmed up. He recommended waiting until there is 95% confidence that content for those requirements are fixed, before working on the associated testing requirements.

Jim’s outlook is that the several modes of voltage regulation in the folder 2 subgroup’s draft edits can be supporting by testing. For ride through, that is outside of the scope of the current 1547. However, Jim shared the view and WG added comments that other means of compliance can be achieved through design validation, simulation, or other testing of subsystems (e.g., communications, controllers).

Jim reported that IEEE 1547.1a was published (March 2015). He reviewed the portion of 1547.1a addressing Voltage regulation and shared his observation that the last mode of voltage regulation listed in 1547.1a-2015 subclause 5.13 is not covered by the draft 1547 edits from folder 2 Voltage regulation subgroup. The description of this mode in 1547.1a is “Where the reactive power output of the EUT changes with respect to real power output, the manufacturer shall specify the response characteristics.” This information was offered for folder 2 subgroup and wider WG to consider the need for coordinating content on the voltage regulation modes.

Jim’s final update item was that this is his last Working Group meeting that he attend based on travel considerations. He could participate in live meetings if held in closer proximity to him, e.g., IEEE headquarters area (Piscataway N.J.). He would continue to participate via webinars.

Folder 2, General requirements, Voltage regulation, Babak EnayatiBabak and Aminul continued their detailed review of their draft edits, took feedback, and incorporated these into edits during the meeting. The changes were captured as redline edits to the draft 2 inputs prepared for the meeting.

Action item. Folder 2 subgroup’s meeting revised Voltage regulation Draft 2 edits will be sent to the WG Secretary within 3 weeks following the meeting.

Folder 2 and folder 3 integration; coordinating revision content between Voltage regulation and Ride throughJens led the discussion on behalf of both folder 2 and folder 3 subgroup leads. He outlined the discussion around the following set of bulleted issues:

Names and meaning of categories, e.g. I, II, II, and X, Y, Z Voltage measurement Voltage reference Terminology of control functions

This discussion concluded with WG consensus that the folder 2 and folder 3 categories should use consistent labeling and meaning. Per show of hand votes, the labeling will conform to Roman numeral numbering, i.e. category I, II and III.


ACTION ITEM –Folder 2 and 3 subgroups will provide the WG a recommendation on the common meanings for Category I, II, and III.

Folder 4, Interoperability, Mark SiiraMark notified the WG that his team held an ad-hoc breakout, and created a version of proposed Draft 2 edits for subclause 4.1.6. Mark then displayed and introduced the Folder 4 Draft 2 edits. These initial edits focused on the body of the standard, e.g. 4.1.6 as the normative text. There is significant informational content proposed for an informative Annex that will cover background e.g., on IEEE 2030 interoperability and other relevant standards development organizations resources that address interoperability and related topics including security.

The discussion was opened up for WG feedback, with Mark, Wayne Stec and Frances Cleveland facilitating the group discussion. Several changes were made to the initial draft text. These were captured as redline edits by both Mark and Frances.

Action item. Folder 4 subgroup’s meeting revised interoperability Draft 2 edits will be sent to the WG Secretary within 3 weeks following the meeting.

New WG study topic, Energy Storage (ES), Taylor Hollis

Taylor opened this discussion by posing a question to the WG as to whether ES needs to be addressed in 1547. Tom pointed out that energy storage is cited in the definition of DR in 1547. From 1547-2003, ““distributed resources (DR): Sources of electric power that are not directly connected to a bulk power transmission system. DR includes both generators and energy storage technologies.”

Taylor refined his point to pose the question whether or not 1547 content adequately covers potential unique interconnection aspects of energy storage. The WG feedback was mixed, thus indicating need for facilitated discussion to better frame the concerns of the working group related to interconnecting energy storage to an EPS.

Taylor volunteered to lead this initial study/framing effort, and asked for expressions of interest in this contributing to this topic. Taylor passed around a sign-in sheet to gather names and emails of interested WG members.

Action item – Folder 5 Special interconnections subgroup will provide an initial forum for Taylor to explore the topic further. By the next WG meeting (October 2015), Taylor will report the outcome of this evaluation of need to address potential unique interconnection aspects of ES in this P1547 revision, and if warranted make recommendations on action to revise 1547 for energy storage.

Next actions and other issues IEEE 1547.1a (published March 2015): rise time footnote in Annex A.6Bryan Lydic provided information on the need for potential clarification or correction in the footnote related to Figure A.6 in IEEE 1547.1a. The figure, related text and footnote from 1547.1a are copied below.


Figure A.6—Graphical representation of power variation testusing step-wise ramp function with n = 4

The 1547.1a related text and footnote related to figure A.6 reads,

“… tr is the rise time of the test signal (tr = t0 – ti)54.

When the step-wise ramp function conflicts with a design characteristic or settings of the EUT, an alternative method that is agreeable to the manufacturer and the testing agency may be used.

Footnote 54 reads: “The rise time tr shall be less than the smaller of 1 cycle or 1% of the settling time of the device for the function under test.”

The issue is that this duration of rise time can result in step-change outputs that exceed device stability limits. Brian recommends evaluation of a better rise time range, and then update of 1547.1a to reflect the improved range.

Jim Daly pointed out that if this is an error, that the IEEE has a procedure to identify the error, and publish the revision (e.g., corrigenda needed to correct an error).

Tom requested that 1547.1a should be scrutinized to consider if any errors, or omissions from the balloted version may exist in the published version.

Action item – Tom invited this WG to send him input on any perceived errors in 1547.1a and recommended revised text.

Proposed new subgroup on unintentional-islanding and other topics proposed for specific efforts


John Berdner proposed formation of a subgroup to address unintentional-islanding. An initial effort of this new team would be to scope the effort of revisions specific unintentional-islanding. A set of subject matter experts has already been discussing that formation. It has been under Leo Casey as a lead and he may call for additional WG members interested in addressing the topic of unintentional-islanding within the 1547 revision.

Action item – Leo to add unintentional-Islanding within his existing subgroup coverage of overall islanding, within Folder 5 Special interconnections.

Action item – WG members interested in working on unintentional-islanding with Leo should email their expression of interest to both John Berdner and Leo Casey.

Soft start and reconnection, voltage impactsBrian proposed that the WG should specify soft start and reconnection as a topic for consideration. WG discussion concluded with the topic earmarked for evaluation within Folder 7 Power quality (PQ), which is being led by Babak Enayati.

Action item - Babak requested WG members interested in PQ topics email him their expression of specific PQ interest.

Smart Inverter Functions InformationFrances Cleveland gave a presentation from California’s Smart Inverter Working Group (SIWG) Phase 3 Activity. This includes a listing of both the basic and advanced inverter functions identified in CA’s industry stakeholder forum. She recommends that the P1547 voltage regulation and ride through modes be assessed against the SIWG 7 core (Phase 2) functions and advanced (Phase 3) functions identified by the SIWG. A PDF copy of the presentation is posted on CDT, file name “SIWG Phase 3 Advanced DER Functions May 28, 2015 v2.pdf”.

NEXT ACTIONSTom recapped the meeting and highlighted some action items:

Action item – Each Vice Chair to send final proposed redline edits (from Draft 1 to Draft 2) to the WG Secretary, after incorporating the input from this WG meeting. Due date is June 22Action item– Secretary will consolidate each folder subgroup edits into the new 1547/Draft 2, which will be the working version for ongoing consideration and the next WG meeting baseline.Action item – WG Members email any feedback on IEEE 1547.1a to Tom.

Meeting adjourned at 4:40PM, Wednesday June 3, 2015.

Respectfully submitted,

Charlie Vartanian P1547 Secretary for Tom Basso, P1547 Chair; --------------------- ---------------------------- Attachment A – Attendees Attachment B – Introductory slides including agenda, updated during the meeting --------------------- ----------------------------


Attachment A – Attendees: P1547 Working Group Meeting June 1-3, 2015First Name Last Name Company NameMarcelo Algrain CATDaniel Arjona Idaho PowerDillon Ashton Nextronix, IncJose Avendano S&C Electric Co.James Barrett NYISOThomas Basso National Renewable Energy LaboratoryFrances Bell SolarCityJohn Berdner Enphase EnergyGeorge Berntsen FuelCell EnergyJens C. Boemer Electric Power Research Institute (EPRI)Richard Bravo Southern California EdisonKen Brunkenhoefer OncorJason Byerly AEPLeo Casey Google, IncMatt Ceglia IEEEFrances Cleveland Xanthus Consulting InternationalNancy Connelly Duke EnergyElizabeth Cook MEPPIJames M. Daley Facilities Electrical Consulting ServicesPatrick Dalton Xcel EnergyMamadou Diong Dominion Virginia PowerJonathan Ehlmann SunPowerBabak Enayati National GridTerry Fix Dominion Virginia PowerDavid Forrest ISO New EnglandMasuda Fumio JapanDarrell Furlong Gridco SystemsJim Girouard WPISteven Goldman ConEd NYSigifredo Gonzalez Sandia National LaboratoriesJason Gunarwardena SRPLance Haines Schneider ElectricRobert Harris NRECAAllen Hefner NISTTaylor Hollis SchneiderSoonwook Hong SolectriaAminul Huque EPRIJames Hurtt Nextera EnergyHIROSHI IRIE Mitsubishi Research InstituteGerald Johnson Basler ElectricRobert Kazimier BaslerMichael Kipness IEEE


First Name Last Name Company NameNoritaka Koga SolectriaPaul Krell Unitil Service Corp.Haiwen (Howard) Liu IntertekBrian Lydic Fronius USAJonathan Meyer Idaho PowerZarin Mirza Central Hudson Gas & Electric CorporationLyman Morikawa Morikawa & Associates, LLCDan Mungovan National GridRohit Nair PacificorpJeff Newmiller DNV GLCatherine O'Brien Salt River ProjectJeannie Piekarz National GridPrassad PMSVVSV Bloom EnergyRobert Preus NRELJim Reilly Reilly AssociatesJonathon Rhyne Duke EnergyMichael Ropp Northern Plains Power TechnologiesJohn Ruddock Deep Sea Electronics PLCMiles Russell SunEdisonNachum Sadan GridEdge NetworksRoger Salas SCEJanette Sandberg Portland General ElectricKarl Schoder CAPS @ FSURich Scroggins Cummins Power GenerationBob Sherman PSE&GMark Siira Comrent InternationalJaspreet Singh ABBMark Smith AEPGary Smullin Smullin Engineering, Inc.Wayne Stec Distregen, LLCChase Sun PG&EMonica Taba Federal Energy Regulatory CommissionPhillip Undercuffler Outback Power TechnologiesCharles Vartanian MEPPIReigh Walling Walling Energy Systems Consulting, LLCRobert White ABBPat Williams East MS Electric PowerTim Zgonena ULAlessandro Zuccato CREI Ven

Attachment B– Introductory slides including agenda updated during meeting


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