Communication between Plug-in Vehicles and the Utility Grid Ford Motor Company

Format:

Conference/Event

Author/Creator:

Scholer, Scholer, author.

Contributor:

Bourton, Michael

Maitra, Arindam

Ornelas, Efrain

Salazar, Jose

Conference Name:

SAE 2010 World Congress & Exhibition (2010-04-13 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2010

Summary:

This paper is the first in a series of documents designed torecord the progress of the SAE J2293 Task Force as it continues todevelop and refine the communication requirements between Plug-InElectric Vehicles (PEV) and the Electric Utility Grid. In February,2008 the SAE Task Force was formed and it started by reviewing theexisting SAE J2293 standard, which was originally developed by theElectric Vehicle (EV) Charging Controls Task Force in the 1990s.This legacy standard identified the communication requirementsbetween the Electric Vehicle (EV) and the EV Supply Equipment(EVSE), including off-board charging systems necessary to transferDC energy to the vehicle.It was apparent at the first Task Force meeting that thecommunications requirements between the PEV and utility grid beingproposed by industry stakeholders were vastly different in the typeof communications and messaging documented in the originalstandard. In order to understand and adequately capture thecommunication structure between plug-in electric vehicles and theelectric power grid, the task force generated two new documents.The original J2293 was also re-issued to keep it intact for legacyequipment.The two new SAE documents are J2836 and J2847. SAE J2836is an Information Report that captures the communicationrequirements between plug-in electric vehicles and the electricpower grid based on use cases. A use case is simply a"story" that includes various "actors", and the"path" they take to achieve a particular functional goal.By considering the actions of the actors working to achieve thisfunctional goal, a completed use case results in the documentationof multiple scenarios, each containing a sequence of steps thattrace an end-to-end path. These sequential steps describe thefunctions that the proposed systems and processes must provide,directly leading to the requirements for the given use case.SAE J2847 is a Recommended Practice which builds upon the UseCases defined in J2836 and defines the detailed messages andspecifications for vehicle to utility communication.Both SAE J2836 and J2847 have a series of dash 1 through dash5 in order to keep the task force focused as we start, beginningwith the fundamental requirements and migrate to other moreadvanced options. Dash 1 identifies the Utility rate and incentiveprograms, dash 2 includes the detail for an EV Supply Equipment(EVSE) for off-board DC chargers (updated version of J2293), dash 3is for reverse energy flow, dash 4 includes diagnostics of thecharging system and PEV and dash 5 contains vehicle manufacturerspecific options.The primary purpose of SAE J2836 and J2847 is to achievegrid-optimized energy transfer for plug-in electric vehicles - thatis, ensuring that vehicle customers have sufficient energy fordriving while minimizing system impact on the electric grid. Thiscan be accomplished, for example, by voluntary participation inutility controlled-charging programs in return for financialincentives, and hence the specification therefore supportsinformation flows that enable such mechanisms.These specifications support energy transfer via both ForwardPower Flow (FPF) (grid-to-vehicle), and Reverse Power Flow (RPF)from vehicle-to-grid. Forward Power Flow is used to charge thevehicle's rechargeable energy storage system (RESS); supportfor FPF is optional, though encouraged, for any plug-in vehicleimplementation. Reverse Power Flow may be used to discharge theRESS, in order to provide support to the grid, or to power localloads during a grid outage; support for RPF is also optional andmay be limited with various RESS applications.Beyond its primary purpose of energy transfer, these documentsenable other applications between vehicles and the grid, such asvehicle participation in various utility rates and incentiveprograms, utility-controlled charging plans (e.g., Demand responseand direct load control), and participation in a Home-Area Network(HAN) of utility-managed electrical devices. The protocolestablished is designed to be extensible, so that as newapplications emerge, additional messages can be added whilemaintaining support for the existing message set

Notes:

Vendor supplied data

Publisher Number:

2010-01-0837

Access Restriction:

Restricted for use by site license