Reliability

Assessment

Committee

Loads and Resources

Task Force (LRTF)

Update

July 16, 2020

Chifong Thomas

LRTF Chair

Members

• Role Member

• Member of DS - Ron Schellberg, NTTG

• Member of DS - Lukas Boler/Alex Stewart, BPA

• Member of DS - Chifong Thomas, Smart Wires

• Member of ADSTF - Jan Strack, SDGE

• L&R Submitter - Matt Prindle, CAISO

• L&R Submitter - George Nail, PNM

• WECC liaison - Colby Johnson

2

Topics

A. Recap

B. Potential Recommendations for DiscussionI. Supplemental Data Requests

a. Load Compositions

b. Resource Depository

II. Supplemental Definitions

III. Resource Data Repository

IV. Proposed Processes a. Populating Behind-the-Meter resources

b. Mapping small resources between PCM and PF

V. Software Enhancements

a. Load Buses

b. Resource Buses

c. Power Plant modeled as aggregated generators

d. Data Base Management

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Recap

4

Issue Summary:

1 Study Objective dictates load levels to be used – how to build bridges between PCM and PF

2 Elements included in Loads in PCMElements included in Loads in PFAllocation of bus loads

3 Generation station service load – how are they modeled?Resolved: Transferred to joint task force from PDWG and SDWG

4 Different unit commitment for generators in the same plant between peak and other conditions

5 When should a future resource be modeled in the base case?

6 Fictitious Elements. Different interpretations between resource planners and transmission planners.

• Twelve webinars since 1/13/2020 DS meeting• Have been working on issues identified:

• Conducted load survey* to guide supplemental data request

▪ LRTF Load Survey and Attachment 1_Proposal for the new Load Format for LnR

▪ Load_Survey_Results_Compilation_LAR_Entity_Name_Removed_and_Lined_Up January 7 2020

* Load Survey and responses:

Topics

A. Recap

B. Potential Recommendations for Discussion

I. Supplemental Data Requestsa. Load Compositions

b. Resource Depository

II. Supplemental Definitions

III. Resource Data Repository

IV. Proposed Processes a. Populating Behind-the-Meter resources

b. Mapping small resources between PCM and PF

V. Software Enhancements

a. Load Buses

b. Resource Buses

c. Power Plants modeled as aggregated generators

d. Data Base Management

5

Proposed Recommendations

for Discussion – Supplemental Data Requests

I. Supplemental Data Requests*

a. L&R data request (include annual hourly profile):i. Add Transmission Losses and DER to L&R data request in 2020

(completed)

ii. Add BTM EV and Storage to L&R Data Request in 2021

iii. Add EE, AAEE and Climate Change to Data Request in 2022

b. Bus Load modifier data request:i. Add Pdmax, Pdmin and Pdgen for BTM DER, EV, Storage, unit

type and their development status as separate quantities to load buses to data request in 2020.

ii. Add Committed Incremental EE, Additional Achievable EE as separate quantities to load buses to data request in 2021

iii. Add Climate Change as separate quantities to load buses to data

request in 2022

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*Proposal for the new Load Format for LnR

(https://www.wecc.org/Administrative/Proposal%20for%20the%20new%20Load%20Format%20for%20LnR.xlsx?Web=1)

Note: Gross load = BA load reduced only for Energy Efficiency (EE) Savings, and includes losses in the distribution system.Net load = Gross load - Incremental committed EE - AAEE – DG_BTM – DR – EV - Storage - Pumping load (if included in L&R)

Some Questions on

Resources Mapping

For Small Resources -o Behind the Metero In front of the Meter

• Whose meter?

• Are they netted with Load in the L&R?

• Are they netted with Load in the PF?

• Are the same resources netted in both the L&R and the PF

• Which buses are they on?

For Large Resources –• In L&R submittal?

• Bus numbers change from case to case?

• Retired or repowered?

Need –• Supplemental Definitions

• Resource Data Repository

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Topics

A. Recap

B. Potential Recommendations for Discussion

I. Supplemental Data Requestsa. Load Compositions

b. Resource Depository

II. Supplemental Definitions

III. Resource Data Repository

IV. Proposed Processes a. Populating Behind-the-Meter resources

b. Mapping small resources between PCM and PF

V. Software Enhancements

a. Load Buses

b. Resource Buses

c. Power Plants modeled as aggregated generators

d. Data Base Management

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Clarify Definitions for WECC

II. Develop supplemental definitions for

o In Front of the Meter (IFOM) DG

o Behind the Meter (BTM) DG

o Energy Storage (ES)

o Electrical Vehicles (EV)

o Distributed Energy Storage Aggregation (DERA)

9

Proposed supplemental BTM DER definitions_draft-3

(https://www.wecc.org/Administrative/Proposed%20supplemental%20BTM%20DER%20definitions_draft-3.docx?Web=1)

Topics

A. Recap

B. Potential Recommendations for Discussion

I. Supplemental Data Requestsa. Load Compositions

b. Resource Depository

II. Supplemental Definitions

III. Resource Data Repository

IV. Proposed Processes a. Populating Behind-the-Meter resources

b. Mapping small resources between PCM and PF

V. Software Enhancements

a. Load Buses

b. Resource Buses

c. Power Plants modeled as aggregated generators

d. Data Base Management

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Mapping Resources between PF and

PCM

1. Consistency ≠ Identical

2. Fictitious elements ≠ Planned elements; Exclude Fictitious elements in studies

3. WECC Path Rating Process (PRP) criteria for including resources in studies in 4 levels*:

o Existing Generation (Existing Resources)

o Signed Agreement (Committed Resources)

o Study Process (Planned Resources)

o Additional Generation Resources (Conceptual Resources)

4. L&R Data Request Worksheets, NERC Class Code**:

o Existing Generation

o Generation Additions

o Tier 1

o Tier 2

o Tier 3

5. Proposal:

o Combine Resource “Levels” and “Tiers” to develop the Resource “Categories”

o Add request for Gen Unique ID (similar to Long ID or EIA#) to aid mapping resources between PF and PCM

11* See Project Coordination, Path Rating and Progress Report Processes, Pages 96 and 97** See 2020 Loads and Resources Data Collection Manual, Appendix A, Pages 17 – 18, “NERC Class Code”

Resource Data Repository

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Column Title DescriptionPF Gen Bus NumberPF Gen Bus namePF Gen Unit IDResource nameEIA ID

Unique Gen ID

TBD, this can be the Long ID or equivalent, e.g., the EIA # plus the unit #, to enable mapping

between PF and PCMResource Category

in L&R submittal 1 = existing or under construction;2 = w/signed agreements, e.g., signed GIA, signed PPA3 = w/regulatory approval, e.g., approved CPCN, approved PPA, approved Power Plant Siting

Certification4 = under generation interconnection study;5 = Application for regulatory approval (e.g., of CPCN, Power Plant Siting) submitted, in IRP

(vertically Integrated entities)6 = generic; interconnection point uncertain - identified as part of a group of resources in a

specific area

7 = generic small resources, bus numbers assigned by Data Submitter

8 = generic small resource, bus number assigned by PCM based on distribution factors

9 = generic small resources netted with Load in L&R Submittal but NOT netted with Load in PF

10 = repowered

11 = retired

Not in L&R Submittal but in Other Studies. See examples for "in L&R Submittal

III. Populate and maintain Resource Data Repository

PRP Level 1; NERC Existing +T1 (Construction) PRP Level 2; NERC T1

PRP Level 3; NERC T2 PRP Level 4; NERC T2 + T3

Resource Data Repository

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Generator InformationName Plate (MW)Stability File Pmax (MW)Stability File Pmin (MW)Station Service Load (MW)

Bus # of Station Service load Bus # where Station Service load is modeledFuel Type Examples: Natural Gas, Coal, Wind, Solar, hydro, Lithium-ion, Nuclear ….

Turbine Type

Examples: CC, CT, Steam, Wind-Type3, Wind-Type4, SolarPV-NonTracking, SolarPV-

Tracking, SolarThermal …Manufacture Model Examples: GE LM6000, GE LMS100 ….Is Cogen?Commission DateRetirement DateOwnerStateCounty

CityLatitude Latitude of the coordinate where the resource is locatedLongitude Latitude of the coordinate where the resource is located

Column Title Description

Resource Data Repository to be maintained by WECC StaffLR_Generator_Info_Supplemental_Draft 10

(https://www.wecc.org/Administrative/LR_Generator_Info_Supplemental_Draft%2010.xlsx?Web=1)

Topics

A. Recap

B. Potential Recommendations for Discussion

I. Supplemental Data Requestsa. Load Compositions

b. Resource Depository

II. Supplemental Definitions

III. Populate and maintain Resource Data Repository

IV. Proposed Processes a. Populating Behind-the-Meter resources

b. Mapping small resources between PCM and PF

V. Software Enhancements

a. Load Buses

b. Resource Buses

c. Power Plants modeled as aggregated generators

d. Data Base Management

14

Mapping Small Resources

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Small Resources Netted with Load in L&R Submittal

(BA Load reduced)

NOT netted with Load in L&R Submittal

(BA Load not reduced)

Netted with

Load in PF

(Bus Load

reduced)

• Do not model in PF or PCM

• No further issue needed to be resolved

• Model as resources in PF

o on the PF bus (if known) where the

resource is netted with bus load, Label

using New Resource Category Code =

“7 - Generic Small Resources, bus

numbers assigned by Data Submitter”

o Use GridView Routine to assign the

resources to the PF buses; Label using

New Resource Category Code = “8 -

Generic Small Resource, bus number

assigned based on distribution factors”

NOT netted

with Load in PF

(Bus Load not

reduced)

• Model as stand-alone resources in the

PCM

• Add “Code 9 = Netted with Load in L&R

Submittal but NOT netted with Load in PF”

• Model as stand-alone resources in PF and

PCM

• Label using Resource Category Codes in

the spreadsheet

• No further issue needed to be resolved

Note: “Netted with Load” = The load is decreased by the MW of the small resource added at the distribution side of the distribution transformer. The small resource can be IFOM or BTM.

Some considerations

• “Small” resources can be netted with load in the L&R BA Load or in the PF bus load.

• DERs that are netted with BA Load (from L&R) are likely BTM;

• DERs that are netted with bus loads in the PF can be either BTM or In Front Of the Meter (IFOM).

o Example: a 9 MW gen connecting to the low side of a distribution substation transformer IFOM will not be netted against BA Load in the L&R; but can be netted against bus load in the PF.

• We need to separate processes for:

• BTM

• IFOM

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Proposed Recommendations

for Discussion – Populating BTM DER

IV. Supplemental Processes

a. Populating BTM quantities in to load buses

Start with the PF suitable for exporting the topology to the PCM (see ADS

Work Flow – next page)

i. Ask if the BA L&R submittal includes Gross Load (excludes BTM) or

Net Load (includes BTM)

ii. For BAs that include BTM in their load projections, map BTM data from

L&R submittal to the PF,

• If BA submits bus numbers associated with BTM, then use the bus

numbers

• If not, spread the BTM Resources to buses based on Pdmax in

Composite Load Model

iii. Develop BTM hourly profile

iv. Develop input file for the PCM

17

PCM ADS Work Flow

18

Source: PCM ADS Work Flow Enhancement Initiative – SDWG/PDWG Proposal Yr(x) Ver 1.8 (9/26/2019) -DeShazo - PCM ADS Work Flow Enhancement Initiative_January 2020

Propose to add a step after the PF just before the topology is imported to the PCM

Populate BTM DER into Load

Step 2: Yr(x) HS4 PF w/ L&R data, Pdmax and Pdgen in ADS Work Flow Enhancement Yr(x) V1.8,

Box 5f ∗

Step 5.a: Extract BTM Bus #,

Capacity, hourly profile

Notify SDWG and PDWG

of missing data

Yes

L&R Data Submittal

Step 3: Find buses from Step 2 with Pdmax, Pdmin or

Pdgen

Step 7: Develop BTM DER hourly profiles based

on agreed upon source(s)

No

Yr(x) HS4 PF “ADS Reference

PF” in ADS Work Flow Enhancement Yr(x) V1.8, add Box 5f-1* between

Box 5f and Box 6a

Develop Input file(s) for Yr(x) PCM‐2

dataset in ADS Work Flow Enhancement Yr(x) V1.8, Box 6a*

* PCM ADS Work Flow Enhancement Initiative – SDWG/PDWG Proposal Yr(x) Ver 1.8 (9/26/2019): DeShazo - PCM ADS Work Flow Enhancement

Initiative_January 2020

Step 1.a Net Load forecast,

i.e. account for BTM?

No

Yes

Step 1.b BTM has capacity,

Bus#, hourly profile?

Step 4: Tabulate data in Step 1.b

and Step 3

Step 6: spread L&R BTM data to BTM Bus # based on Step 3

For reference, please see “Capture Behind the

Meter (BTM) DER and Populate the ADS PCM

with Corresponding Discrete Resources“:

https://www.wecc.org/Administrative/Populate%20BTMDER%20into%20L

oad_2020-04-22_Final%20Rec.pdf

Buses w/ Pdmax,

Pdmin or Pdgen?

PDWG Works with appropriate BA

SDWG Works with

appropriate Data Submitter

No

Yes

Notify PDWG of missing data

Step 5.b: Check that BTM Bus # from Step 1match the

BTM# from PF

For Discussion – Mapping Small Resources

b. Mapping small resources

Note: the following is the existing process used for the 2030 ADS, this will be the starting point for developing the recommended mapping process.

i. From the list of resources in the L&R Submittal, identify the IFOM resources (i.e., not netted against the load)

ii. From the list in (i), find the corresponding buses in the Power Flow. If the corresponding bus number exists, assign the bus number and a unique generator ID to the resources• If the corresponding bus number does not exist, aggregate the

small resources 10 MW or less by county to near-by highest voltage bus per GridView gen distribution factors (not to exceed 50% of bus load), assign a Gen ID to each such bus

20

Topics

A. Recap

B. Potential Recommendations for Discussion

I. Supplemental Data Requestsa. Load Compositions

b. Resource Depository

II. Supplemental Definitions

III. Populate and maintain Resource Data Repository

IV. Proposed Processes a. Populating Behind-the-Meter resources

b. Mapping small resources between PCM and PF

V. Software Enhancements

a. Load Buses

b. Resource Buses

c. Power Plants modeled as aggregated generators

d. Data Base Management

21

Proposed Recommendations

for Discussion

V. Software Enhancements:

a. Load Buses:

i. Add load bus format input fields to PF and PCM to allow for Load

Components: Pdmax, Pdmin and Pdgen for BTM DER, EV, Storage,

EE, AAEE, and spare fields for entries on Climate Change and other

future parameters

ii. Automate the processes to map and populate BTM resources between

PCM and PF into load buses for the corresponding 10th year PF case

and PCM case.

b. Resource Buses:

i. Add input field to generator bus format to incorporate data from

the Resource Data Repository. This will allow the same generator

information to carry from PF to PCM and back

22

Proposed Recommendations

for Discussion

c. For power plants that are modeled as aggregated generators representing all units in the power plant in the ADS PCM -

i. If the ADS PCM utilizes topology in the PF representing system conditions at one load level, further investigate if unit commitment and de-commitment in the round trip to obtain PF at a different load level will result in the appropriate number of units on-line.

ii. Vet this process with the SRS and StS

d. Data Base Managementi. Develop and maintain Relationship Data Base, such as Assess. This was

proposed earlier in the ADSTF

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Next Meetings

• July 23, 2020, 9:30 a.m. – 11:00 a.m. Webinar

• July 30, 2020, 9:30 a.m. – 11 a.m. Webinar

• August 13, 2020, 9:30 a.m. – 11:00 a.m. Webinar

• August 27, 2020, 9:30 a.m. – 11:00 a.m. Webinar

• September 10, 2020, 9:30 a.m. – 11:00 a.m. Webinar

• September 24, 2020, 9:30 a.m. – 11:00 a.m. Webinar

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Contact:

Colby Johnson

cjohnson@wecc.org

25