Review of Renewable Energy-Based Charging Infrastructure for Electric Vehicles


Table 4. Renewables’ charging programs. Approach



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Table 4.
Renewables’ charging programs.
Approach
Advantages
Programs/Plans
Example of Costing
Utility
Renewables’ network
charging
–Enables customers to charge
with renewable sources.
–Encourages drivers to
charge at beneficial times
–Pay per use.
–Monthly flat fee
2 USD per h
4.17 USD per month
Austin Energy
Offers for time-shifting
and renewables’ access.
–Encourages charging at
more suitable times for the
grid by considering the
availability of renewables
and avoiding peak hours
–Charging with
renewable energy.
–Merge TOU rates with
renewables’
pricing program
No extra cost for wind
energy or
0.02 USD per kWh
Great River
Energy &
Potomac Electric
Power Co.
Pair on-site renewables’
charging with EV
charging
–Free management and
control charging
–Beneficial
charging rate
–Free employee
charging
Cost varied
San Diego’s Solar
and Google LLC
Smart charging
–Allows utilities to control
charging remotely to meet
grid needs.
–Managed
charging program
Cost varied
Pacific Gas &
Electric/BMW
Matching rate with
surplus
renewable energy
–Shifts charging loads to
times when there is excess
renewable energy generation
on the grid
–Time of use
(TOU) rates
Varies from 0.9 to 1.5
USD per kWh
Xcel Energy
9. Challenges of Renewable Energy-Based Charging Infrastructure
Power quality:
It was noticed that generating renewable power could introduce
power quality problems. According to the changing nature of wind and solar, generating
renewable power is intermittent, with high fluctuations, and non-dispatchable [
120
]. The
RCI features mainly in charge of power quality challenges include the modularity of
renewable generators. Power quality seems to be one of the most critical aspects that could
affect the reliability and stability of RCI.
Stability:
It refers to the recovery of the power system after blackouts and control of
the voltage and frequency. Stability challenges are mostly caused by the excess of power
from renewable energy, and battery storage that can cause significant damage to RCI [
121
].
Controlling the stability can ensure the power system is performing correctly and not
approaching instability.
Power balance:
The power unbalancing occurs in RCI because of the renewable
sources’ uncertainty and variability. This challenge relates to the long-term balance of
active supply and load in the power system. This includes the system-wide coordination
of ramp rate capacities and minimum generation levels of a power system [
122
].

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