Integration of electric vehicles to the distribution
grid
Nina Wahl Gunderson and Kjell Sand
SINTEF Energy ResearchNorway
Frankfurt (Germany), 6-9 June 2011
Introduction Strong Norwegian incentives promoting electric
vehicles (EVs) EV load may cause power quality (PQ) problems Study on car pool in downtown Trondheim Energy, power and PQ measurements Load characteristics
Nina Wahl Gunderson – Norway – Session 5 – 0785
Frankfurt (Germany), 6-9 June 2011
Measurement instruments Power Detective energy meter
Elspec G4500 Blackbox advanced PQ recorder
Nina Wahl Gunderson – Norway – Session 5 – 0785
Frankfurt (Germany), 6-9 June 2011
Charging pattern single vehicle
Nina Wahl Gunderson – Norway – Session 5 – 0785
Frankfurt (Germany), 6-9 June 2011
Coincidence factor = Nina Wahl Gunderson – Norway – Session 5 – 0785
Total load 11 charging stations
Frankfurt (Germany), 6-9 June 2011
Utilization time single vehicle
Nina Wahl Gunderson – Norway – Session 5 – 0785
0 2 4 6 8 10 12 14
x 104
0
500
1000
1500
2000
2500
3000Duration curve
Pow
er (W
)
Frankfurt (Germany), 6-9 June 2011
PQ measurements: voltage THD
Nina Wahl Gunderson – Norway – Session 5 – 0785
2%2%
Frankfurt (Germany), 6-9 June 2011
PQ measurements: Voltage unbalance
Nina Wahl Gunderson – Norway – Session 5 – 0785
0,5%0,5%
Frankfurt (Germany), 6-9 June 2011
Conclusions Afternoon power peak No values close to PQ code limits Low voltage THD values Some voltage unbalance EVs may cause problems in weak grids Fast chargers require further studies
Nina Wahl Gunderson – Norway – Session 5 – 0785