Type: Package
Title: Computes and Plot the Optimal Charging Strategy for Electric Vehicles
Version: 0.1.0
Description: The purpose of this library is to compute the optimal charging cost function for a electric vehicle (EV). It is well known that the charging function of a EV is a concave function that can be approximated by a piece-wise linear function, so bigger the state of charge, slower the charging process is. Moreover, the other important function is the one that gives the electricity price. This function is usually step-wise, since depending on the time of the day, the price of the electricity is different. Then, the problem of charging an EV to a certain state of charge is not trivial. This library implements an algorithm to compute the optimal charging cost function, that is, it plots for a given state of charge r (between 0 and 1) the minimum cost we need to pay in order to charge the EV to that state of charge r. The details of the algorithm are described in González-Rodríguez et at (2023) https://inria.hal.science/hal-04362876v1.
License: GPL-3
Language: en-US
Imports: ggplot2, cowplot
RoxygenNote: 7.2.3
Encoding: UTF-8
NeedsCompilation: no
Packaged: 2024-01-09 10:12:05 UTC; Brais
Author: Brais Gonzalez-Rodriguez [aut, cre]
Maintainer: Brais Gonzalez-Rodriguez <braisgonzalez.rodriguez@usc.es>
Repository: CRAN
Date/Publication: 2024-01-10 13:43:07 UTC

Computes the minimum cost function

Description

Function that computes the minimal cost function for a given charging function (given by a, alpha and beta), an electricity price function (given by delta and gamma), a consumption tau and a range R

Usage

minimum_cost(a, alpha, beta, delta, gamma, tau, R)

Arguments

a

vector with the breaking points of charging function in the x-axis

alpha

vector with the slopes of the charging function on each segment

beta

vector with the y-intercepts of the charging function on each segment

delta

vector with the times duration of each segment of electricity price function

gamma

vector with the prices of the electricity on each segment of electricity price function

tau

consumption of the vehicle (numerical value)

R

range of the vehicle (numerical value)

Value

list with the x-values and y-values of the minimum cost function

Examples

a <- c(0,3.3,6.6,10)
alpha <- c(0.1757576, 0.07272727, 0.05294118)
beta <- c(0, 0.34, 0.4705882)
delta <- c(4, 3, 5)
gamma <- c(0.45, 0.25, 0.5)
tau <- 0.15
R <- 250
opt_cost_function = minimum_cost(a, alpha, beta, delta, gamma, tau, R)
print(opt_cost_function)

Plots the charging function, the electricity price function and the optimal cost function

Description

Function that plots the charging function, the electricity price function and the optimal cost function

Usage

plot_functions(a, alpha, beta, delta, gamma, tau, R, x_values, y_values)

Arguments

a

vector with the breaking points of charging function in the x-axis

alpha

vector with the slopes of the charging function on each segment

beta

vector with the y-intercepts of the charging function on each segment

delta

vector with the times duration of each segment of electricity price function

gamma

vector with the prices of the electricity on each segment of electricity price function

tau

consumption of the vehicle (numerical value)

R

range of the vehicle (numerical value)

x_values

vector with the x-values of the breaking points of the charging cost function

y_values

vector with the y-values of the breaking points of the charging cost function

Value

A plot with the charging function, the electricity price function and the optimal cost function

Examples

a <- c(0,3.3,6.6,10)
alpha <- c(0.1757576, 0.07272727, 0.05294118)
beta <- c(0, 0.34, 0.4705882)
delta <- c(4, 3, 5)
gamma <- c(0.45, 0.25, 0.5)
tau <- 0.15
R <- 250
opt_cost_function = minimum_cost(a, alpha, beta, delta, gamma, tau, R)
xvalues <- opt_cost_function[["xvalues"]]
yvalues <- opt_cost_function[["yvalues"]]
plot_functions(a, alpha, beta, delta, gamma, tau, R, xvalues, yvalues)