1. ISO/IOU T&D Interface Update Thomas Bialek PhD, PE Chief Engineer
November 2, 2017
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2. 2017 T&D Interface Effort
Consider longer-term coordination needs and solutions
Learn from the experience of new DERs/DERAs coming into the market in 2017
Keep pace with DER-related developments in California and the industry as a whole
Better define real-time coordination processes and procedures
address potential conflicts between DO operational needs and ISO dispatches

3. Use Cases Goals
Create a foundation for a DERA to participate in ISO DERP program
Pathway for simple to complex
Define who needs to know what
CAISO DO
DERP
Determine communication needs
Protocol
IEEE smart inverters
Latency
Data
Document information requirements, data exchange, tools and systems
Day Ahead, Hour Ahead, 15 minutes and Real-Time
Changes if the DERP is available energy vs dispatchable?

4. Time scales & modelling tools in electric grid operation
Courtesy of Sacha Von Meier and Paul Denholm

5. Distribution Operations Scenarios
Business as Usual Normal Configuration
Blue sky day
Interconnection study and hosting capacity completed
DERA available
Business as Usual Abnormal Configuration
Interconnection study and hosting capacity not completed
DERA unavailable
DERA derate only possible if multiple DER, multiple interconnection points
on multiple circuits
Planned Outage/Maintenance
Forced Outage/Emergency

6. Distribution Operations – Use Cases
2017 Deliverables
Written documentation on the wholesale market use cases
Internal to WG
Subsequent management review and publishing

7. Distribution Operations – Use Cases
Number
Use Case Title
Use Case Description
DER Portfolio
Wholesale
Distribution
High Penetration
High DER Penetration
No DERA on circuit No 1
Single DER: Wholesale
DER with single interconnection point participating in wholesale market
DERA under a single interconnection point
Yes 2a
Multiple DER, Single Circuit: Wholesale
DER aggregation, DERA, with multiple DER interconnection points on a single circuit participating in wholesale market
DERA under multiple interconnection points on a single circuit 2b
Multiple DER, Multiple Circuits: Wholesale
DER aggregation, DERA, with multiple DER interconnection points on multiple circuits participating in wholesale market
DERA under multiple interconnection points on multiple circuits 3
Single DER: Distribution
DER with single interconnection point providing distribution services to DO 4a
Multiple DER, Single Circuit: Distribution
DER aggregation, DERA, with multiple DER interconnection points on a single circuit providing distribution services to DO 4b
Multiple DER, Multiple Circuits: Distribution
DER aggregation, DERA, with multiple DER interconnection points on multiple circuits providing distribution services to DO 5
Single DER: Wholesale + Distribution
DER with single interconnection point participating in wholesale market and providing distribution services to DO 6a
Multiple DER, Single Circuit: Wholesale + Distribution
DER aggregation, DERA, with multiple DER interconnection points on a single circuit participating in wholesale market and providing distribution services to DO 6b
Multiple DER, Multiple Circuits: Wholesale + Distribution
DER aggregation, DERA, with multiple DER interconnection points on multiple circuits participating in wholesale markets and providing distribution services to DO

8. Data Exchanges ISO DER on HV
Aggregated capacity on the high-side bus of the substation transformer
From DERP/SC size/bids/meter data
DERP size
Aggregated DER MW size bid into wholesale market
DERP bid
MW amount of the DER bid into wholesale market in the appropriate time frame
DERP meter data
Production data based upon ISO schedule for settlement purposes
From DO outage data
DO Outage data
After the fact distribution outage data that occurred which might impact DERP participation DO
DER Amps
DER production presented on high-side of the distribution service transformer
From ISO schedule?
ISO schedule
ISO dispatch schedule awarded to the DERP
DERP
From DO capacity
DO capacity
Available or unavailable state of the DERP based upon distribution conditions
From DO P Node
P Node
P Node to which the DERP is connected based upon distribution conditions
From ISO/SC schedule

9. Distribution Operations – State 1

10. Distribution Operations – State 2

11. Questions?
Thomas Bialek
Chief Engineer