1. Distribution Services, Attributes and Performance and Measurement Requirements
Subteam 1a
Competitive Solicitations Framework Working Group Meeting
Integrated Distributed Energy Resources Proceeding
Mark Esguerra and Diana Genasci
July 28, 2016
Mark Esguerra

2. Definitions of Basic Distribution Services
Distribution Capacity
Load modifying or supply services that DERs provide via dispatch of power output (MW) or reduction in load that is capable of reliably and consistently reducing net loading on desired distribution infrastructure.
Voltage Support
(Voltage control through real and/or reactive power)
Improved steady-state voltage to avoid voltage related investment. Dynamic voltage management to keep secondary and primary voltage within Rule 2 limits.
Reliability (Back-Tie)
Load modifying or supply service capable of improving local distribution reliability and/or resiliency. Service provides fast reconnection and availability of excess reserves to reduce demand when restoring customers during abnormal configurations.
Resiliency (Microgrid)
Load modifying or supply service capable of improving local distribution reliability and/or resiliency. Service provides fast reconnection and availability of excess reserves to reduce demand when restoring customers during abnormal configurations. Service also provides power to islanded end use customers when central power is not supplied and reduce duration of outages.

3. Distribution Service Attributes
Locational Specificity of Distribution Services
Level or Magnitude of Required DER Response
Timing and Duration of DER Response
DER Availability and Assurances

4. Performance Requirements
System Availability
Data Availability
Response Time
Quality of Response

5. APPENDIX

6. Integrated Distribution Planning Framework
Assumptions, Scenarios & Scope
Distribution
Planning
Assessment
Distribution Grid Needs
Evaluate Options
Sourcing
Distribution Resources Plan (DRP)
Integrated Distributed Energy Resources (IDER) 1 2 3 4 5
Develop forecasts, assumptions and planning scenarios.
Demand forecasts
DER forecasts
DER Growth Scenarios
Distribution Grid Studies
Distribution Capacity
Voltage Support Requirements
Protection
Safety and Reliability
Distribution Grid Needs
Load Serving Capacity
DER Hosting Capacity
DER Aggregator Requirements
Coordination with Transmission Planning
Prioritize Grid Needs
Investment framework/technical feasibility
Implement “Wires” alternatives for locations deemed infeasible for DERs
Sourcing Process to satisfy needs identified in DRP
Implement “Wires” Solution

7. Distribution Grid Needs Hypothetical examples of Distribution Service Attributes3
Assumptions, Scenarios & Scope
Distribution
Planning
Assessment
Distribution Grid Needs
Evaluate Options
Distribution Portfolio 1 2 3 4 5

8. Distribution Capacity: Substation Transformer Overload
Distribution Grid Need
An MW rated substation transformer is forecasted to overload in the summer months.
Substation transformer capacity deficiency is determined to be:
1.4 MW by 2019
2.6 MW by 2020
3.6 MW by 2021
Traditional “wires” solution is to replace existing or install an additional transformer, after exhausting available capacity through field switching onto adjacent distribution feeders.

9. Distribution Capacity: Substation Transformer Overload
Potential DER Solution for Overload Need:
Attributes of DER performance must match overload issue attributes to provide relief of capacity constraint
Other attributes of DERs must address grid issues stemming from DERs providing relief of capacity constraint (e.g. ramp rate)
DER Attributes to Procure
YEAR
2017
2018
2019
2020
2021
Distribution Capacity Need (MW) -
1.4
2.6
3.6
Distribution Capacity Need (MVAr)
Months when needed
Aug-Sept
July-Sept
Days when needed
Mon-Fr
Time when needed
16:00-19:00
15:00-20:00
14:30-20:30
Duration (hours/day) 3 5 6
Frequency of Need (days/month) 1

10. Voltage Support Services: Steady State Under Voltage
Forecast Under Voltage Issue:
A pump station customer is planning to convert two pumps from diesel to electric by 2020
The pumps will add an extra 1 MW to peak load condition. Customer is located close to the end of a radial feeder
Projected under voltage conditions near the end of the feeder is found to occur around forecasted peak loading times
Rule 2 Limit M
Rule 2 Limit

11. Voltage Support Services: Steady State Under Voltage
Potential DER Solution for Overload Need:
Attributes of DERs should match under voltage issue attributes to stay within Rule 2 voltage thresholds (±5% of nominal voltage)
Attributes of under voltage issue
Needed voltage changes (ΔV) to stay within Rule 2 limits
Locations where under voltage occur
Times and duration when under voltages occur
Other attributes of DERs must address grid issues stemming from DERs providing voltage support (e.g. ramp rate)
DER Attributes to Procure
YEAR
2017
2018
2019
2020
2021
Distribution Capacity Need (kW) -
500
550
Distribution Capacity Need (kVAR)
50 at lagging PF
60 at lagging PF
Duration (hours/day) 3
Frequency of need (days/month) 8
Time Needed
17:00-20:00
Days Needed
Mon-Fr
Months Needed
June-July
May-July
Electrical Proximity from Voltage Issue
0.5 Circuit Miles of SPID 77943XXXXX
Ramp Rate (kW/min)
N/A

12. Voltage Support Services: Steady State Under Voltage
Location Matters: G M
Almost Identical Voltage Profile when Compared to no DER Scenario
Rule 2 Limit G M
Voltage is Back within Rule 2 Limits
Rule 2 Limit