Page 457 - Decision Making Applications in Modern Power Systems

416 Decision Making Applications in Modern Power Systems

EV data exchange server:
communicates with each EVSE via vendor charging station API,
sends the charging session info (including user ID) from the EVSE to
the EV optimization server, and
sends and implements the optimal charging power settings from the
EV optimization server to the controlled EVSE.

16.2.2 Communication information exchange

In the smart charging system for public EVs, as shown in Fig. 16.2, a mobile
app is deployed for interacting with the pilot study participants. When the
driver plugs in the vehicle and activates the charging session, the Kisensum
server will capture the active charging session(s) and pass the session data to
the LBNL server. Then the web service checks if the active charging session
belongs to one of the pilot study participants in the database. If it is true, the
server will send a “Welcome” text message to the driver through the web
service. In the text message, we provide a link to a webpage for submitting/
modifying the charging request. The driver needs to provide the estimated
departure time and the estimated travel distance in miles or energy in kWh
for the next trip. Once the drive agrees to participate into the smart charging
control, they can go to the webpage using the same link and check in the
charging status at anytime during the active session period.
The data exchange server communicates with the charging station
(EVSE) through the web services API to manage the charging stations con-
nected to vendor’s cloud network. The data exchanged between the EV opti-
mization server and the data exchange API includes the charging session and
meter data, which is in JSON format. In the communication system for pub-
lic EVs a short message service (SMS) provider is deployed to send/receive
notifications and charging request to/from drivers, as presented in Fig. 16.3.
Regarding the SMS interactive system between the EV optimization
server and the participant, the driver will only receive the text message from
the EV optimization server when plugging the vehicle into the controlled
charging stations on the demonstration site. The charging will start as usual
until the participant submits the charging request on a webpage. On the same
webpage, the participant can change the departure time and/or the energy
charge needed at anytime during the charging session. When participants
submit their charging requests to the EV optimization server through the
web service, the optimizer in the EV optimization server will first detect if
this message is new or not. If it is a new message, the optimizer will initiate
the optimization immediately and update the optimized the charging power
sequence for all the controlled charging sessions in the database. Meanwhile,
the EV optimization web service will send all the optimized charging power
sequences to the data exchange server in the JSON format. Last, the data