1. PEV-Grid Coordination David P. Tuttle, Ph. D
PEV-Grid Coordination David P. Tuttle, Ph.D. The University of Texas at Austin Energy Institute

2. PEV-Grid Coordination
PEVs (Plug-in Electric Vehicles) are Large, Flexible, & Intelligent new loads (parked for 22+ hrs/day)
Utilities are attracted to PEV driven load growth, particularly with off-peak charging
- DR, Intelligent Charging, V2G offer additional benefits beyond increased revenue
Dr. David P. Tuttle

3. PEV Charging Locations
Public
- DC-Fast Charging (50-350kW)
- Level-2 240V ( kW)
- Level-1 120V (1-1.44kW)
Short Dwell Time
- Intercity BEV Travel DCFC
- Urban BEV DCFC
Workplace & Fleets
- DC-Fast Charging (50-350kW)
- Level-2 240V ( kW)
- Level-1 120V (1-1.44kW)
Long Dwell Time
- Workday
- Fleet overnight
Home:
- Level-2 240V
- Level-1 120V
Long Dwell Time
- Home Charging
The Type of PEV
(BEV vs PHEV)
influences the ability
to manage charging

4. Long dwell time charging tends to be most flexible
Location & Type of Charging can influence the ability to manage charging
Long dwell time charging tends to be most flexible

5. Objective: Same EVSE Hardware with only Software Upgrades
PEV-Grid Coordination Roadmap Residential/Workplace/Fleet Charging: Increasing Amounts of Capability Over Time
1st Generation (Today):
Plug-In & Charge
2nd Generation:
Basic DR
3rd Generation:
Smart-Charging
4th Generation:
V2G*
Power flows
To & From Vehicle
Power flows Only To Vehicle
No PEV-Grid Communications
Capability
Grid-EVSE/PEV Communications via:
Home Broadband-Wi-Fi, Utility Backhaul, Cellular/Radio, Direct to Vehicle
Vary Power Level/Direction
to maximally Peak Shave,
Align with Renewables,
Mitigate Ramp Rates,
Reduce Costs/Grid Stress
Off-Peak Charging
Encouraged via Utility EV-TOU tariffs
Vary Charging to Peak Shave,
Align with Renewables,
Mitigate Ramp Rates,
Reduce Costs/Grid Stress
No Coordination:
Immediate Charging
Peak Shaving via
Pause in Charging
Little Impact Today Given Modest
Number of Vehicles
Program Charge Time
via Car Console,
Browser, or App
Utility DR Signals
Similar to Smart
Thermostats
Utility and/or ISO/RTOs Coordinates with Vehicles
Objective: Same EVSE Hardware with only Software Upgrades
Dr. David P. Tuttle
* Most Complex PEV-Grid Interaction