ev charging process and smart charging - edx
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EVchargingprocessandsmartchargingProf.Dr.Pavol Bauer,DelftuniversityofTechnology
Charging process
Ener
gy st
ored
in b
atte
ry
Constantcurrentregion
Constantvoltageregion
Charging calculation
Chargingpowerandcurrent:
Pch =Vbatt Ich
wherePch isthechargingpower,inWVbatt isvoltageoftheEVbattery,inVIch isthechargingcurrent,inA
Charging calculation
Chargingpowerandenergy:
Ech =∫𝑃#$�� 𝑑𝑡
wherePch isthechargingpower,inkWEch istheenergydeliveredduringcharging,inkWht isthetimeperiod,inhours
Charging calculation
Chargingpowerandenergy:
Ech =𝑃#$𝑡#$
wherePch isthechargingpower,inkWEch istheenergydeliveredduringcharging,inkWhtch isthechargingtime,inhours
10𝑘𝑊(2ℎ)20kWh=
Charging calculation
wherePch isthechargingpower,inkWEnom isthenominalenergycapacityofthebattery,inkWh
C−rate=𝑃#$Enom
HigherC-rateßà Higherbatterylossesßà Lowerlifetime
C-rate
Smartcharging
Uncontrolledcharging
Power(W
)
Time
Uncontrolledcharging
WhentheEVisconnectedtothecharger
Uncontrolledcharging:Effects
Power(W
)
Car1
Time
Uncontrolledcharging
Car2
Car3
• Peakloadingongrid• Upgradeelectricitynetwork• Nocorrelationtorenewable
generationlikesolar• Nocorrelationto energyprices• Manymore……
Smartcharging
Power(W
)
Car1Time
Car2
Controlledcharging
Car3
Load
Power(W
)
Car1
Time
Car2 Car3
Controlledcharging
Power(W
)
Car1Time
Car2Car3
Controlledcharging
SmartchargingCharge
fromwindCharge
fromsolar
Highprices:Reducecharging
Time
Smart chargingControl and
communication
IEC 61851ISO 15118
Off-boardCharger
Control and communication
Imag
ecreditsgohere
EVchargingprocessandsmartchargingProf.Dr.Pavol Bauer,DelftuniversityofTechnology