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

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EVchargingprocessandsmartchargingProf.Dr.Pavol Bauer,DelftuniversityofTechnology