PAP22
EV Refueling Submetering
Use Cases
5 November 2013
SGIP Inaugural Conference
Palm Beach, Florida
V2G DEWG F2F Session
George Bellino
EV Submetering Use Cases
Four Use Cases Identified
1. Utility Owned Revenue Submeter
2. 3rd Party/Customer Owned Revenue Submeter
3. Non-Utility Revenue Submeter
4. Real Time Dispatchable Load Submeter
Use Case 1:
Utility Owned Revenue Submeter
Electric Panel
Utility
Electric
Submeter
Primary
Electric Meter
EVSE
PEV
Power
Communications
•
Purpose: separate measurement of PEV refueling kWh consumption for
utility billing based on specific EV rate tariff
•
Requirements: Utility Jurisdiction - Accuracy, Access, Certification, Test ,
etc. specifications per utility regulations
• Applied Standards: ANSI C12.1, C12.20, etc.
Use Case 2:
3rd Party/Customer Owned Revenue Submeter
Electric Panel
Utility
External
Submeter
Primary
Electric Meter
Embedded
SoC
Power
Data
Management
Agent
EVSE
PEV
Internal
Submeter
Daughter
Card or
Module
Communications
•
Purpose: separate measurement of PEV refueling kWh consumption for
utility billing based on specific EV rate tariff
•
Requirements: Jurisdiction is State Weights & Measures agencies
• External Submeter can be same as Utility Owned Revenue Submeter
• Other configuration as determined by ANSI C12 Sub Committee
• NEMA determining EVSE Embedded Submeter requirements
• Apply to Internal Submeter and Daughter Card/Module options
Use Case 3:
Non-Utility Revenue Submeter
Primary
Account
Owner
or EMS
Electric Panel
Primary
Electric Meter
Embedded
SoC
Power
Data
Management
Agent
External
Submeter
EVSE
PEV
Internal
Submeter
Daughter
Card or
Module
Communications
•
Purpose: separate measurement of PEV refueling kWh consumption for
allocated billing by landlord to tenants or information for facility energy
management – not for utility billing
•
Requirements: Jurisdiction is State Weights & Measures agencies
• External Submeter same as Utility Owned Submeter;
• Other configuration as determined by ANSI C12 Sub Committee
• NEMA determining EVSE Embedded and Internal/Module Submeter
requirements
Use Case 4:
Real-time Telemetry for Dispatchable Loads
Electric Panel
Utility/ISO
Primary
Electric Meter
External
Submeter
EVSE
Embedded
SoC
Power
PEV
Internal
Submeter
Daughter
Card or
Module
Aggregator/EVSP
Communications
•
Purpose: provide the operational state - i.e. amount of power consumed or
produced by the PEV in real-time for bi-directional power flow
•
Requirements:
• Measure instantaneous power - both real and apparent
• Measure charge/discharge energy capacity
• Frequency data measured – 2 seconds to 5 minutes
• Frequency data reported – 2 seconds to 15 minutes
• Power measurement accuracy: 2% - 5%
Use Case Requirements Structure and
Dependencies
PEV Refueling
Submeter Requirements
NIST
PUC
NCWM
ANSI
NEMA
Assumptions/Questions
•
Use Case 1: Utility Owned Revenue Submeter
•
•
•
•
Use Case 2: 3rd Party/Customer Owned Revenue Submeter
•
•
•
•
•
•
EVSE to be tested as a submeter device - Requirements apply to all embedded and internal
daughter board/module configurations
External submeter – comply with NEMA requirements or same Utility owned Submeter?
Assume not addressing Level 1 submetering nor portable submetering?
Communication protocols to be specified by utility industry?
Harmonization with NCWM HB44 requirements?
Use Case 3: Non-Utility Revenue Submeter
•
•
•
Assumes existing Utility meter regulations apply
Will Utilities own EVSE as a submeter device and affect EVSE embedded/internal submeter
requirements?
Per HB 33 all EVSEs shall have submeter function – conflict with Utility fixed submeter?
Assumes requirements same as Use Case 2
Is there differentiation in Accuracy, Calibration, Access, etc. requirements between Utility
Revenue Submeter and Non-Utility Revenue Submeter?
Use Case 4: Real Time Telemetry for Dispatchable Loads
•
•
Will requirements for Use Case 2 and 3 support this Use Case?
Is there variability in functional requirements that need be addressed?
Questions
• Do all state PUCs maintain jurisdiction over utility revenue meters?
– How do municipal utilities (not under CPUC jurisdiction such as SMUD and
LADWP) regulate their revenue meters?
• Do other states allow use of submeters for utility billing?
• Will other state PUCs adopt 3rd Party revenue submeter ownership?
• Is it assumed there will be variability in performance and
functionality requirements between embedded, portable, and fixed
submeters?
• Is there intent to submeter 120V/1.5kW charging? Portable EVSE
cords, plug outlet adapters, etc.?
• Is there differentiation in performance and functionality between
submeters for C&I environment versus Residential environment?