evsim (version 1.7.1)

get_demand: Time-series EV demand

Description

Obtain time-series of EV demand from sessions data set

Usage

get_demand(sessions, dttm_seq = NULL, by = "Profile", resolution = 15)

Value

time-series tibble with first column of type datetime

Arguments

sessions

tibble, sessions data set in standard format marked by {evprof} package

dttm_seq

sequence of datetime values that will be the datetime variable of the returned time-series data frame.

by

character, being 'Profile' or 'Session'. When by='Profile' each column corresponds to an EV user profile.

resolution

integer, time resolution (in minutes) of the sessions datetime variables. If dttm_seq is defined this parameter is ignored.

Details

Note that the time resolution of variables ConnectionStartDateTime and ChargingStartDateTime must coincide with resolution parameter. For example, if a charging session in sessions starts charging at 15:32 and resolution = 15, the load of this session won't be computed. To solve this, the function automatically aligns charging sessions' start time according to resolution, so following the previous example the session would start at 15:30.

Examples

suppressMessages(library(lubridate))
suppressMessages(library(dplyr))

# Get demand with the complete datetime sequence from the sessions
sessions <- head(evsim::california_ev_sessions, 100)
demand <- get_demand(
  sessions,
  by = "Session",
  resolution = 60
)
print(demand)

# Get demand with a custom datetime sequence and resolution of 15 minutes
sessions <- head(evsim::california_ev_sessions_profiles, 100)
dttm_seq <- seq.POSIXt(
  as_datetime(dmy(08102018)) %>% force_tz(tz(sessions$ConnectionStartDateTime)),
  as_datetime(dmy(11102018)) %>% force_tz(tz(sessions$ConnectionStartDateTime)),
  by = "15 mins"
)
demand <- get_demand(
  sessions,
  dttm_seq = dttm_seq,
  by = "Profile",
  resolution = 15
)
print(demand)