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Impact of Supraharmonics on the Power Grid;
an EV perspectiveThijs van Wijk - ElaadNL
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Founded in 2009
and funded by the Dutch grid
operators, ElaadNL is a non-
profit Knowledge & Innovation
Centre in the field of (smart)
charging infrastructure
ElaadNL works on
the smooth integration of
electric vehicles to the power grid
while making full use of renewable energy
3
ElaadNL TESTING GROUND
Making sure you can smart charge
• Most NL stations present (20+ station types, including DC and V2G stations)
• Live monitoring and measuring
• Smart Charging simulation
POWER QUALITY TESTING LAB
Making sure the EV can smoothly integrate in the grid
• Measuring (supra-)Harmonic Distortions, reactive current and inrush currents
• Immunity of EV to PQ effects
• Simulation of different (European) electricity grids
Supraharmonics (2 kHz – 150 kHz)
Generalized:
• As artifact from power conversion - AC->DC or DC->AC
• “Intentional” emission- Power line communication
Sources of Supraharmonics
Known effects of Supraharmonics
Measurements on Electric Vehicles (OBC)
Supraharmonic currents
9 most common BEVs in NL (2018): 92% of total 45.000 BEVs
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U = I x Z
I = U / Z
Examples Supraharmonic measurementIn frequency domain
Smart charging
Examples Supraharmonic measurementSmart charging, broadband distortion, reflections
Examples Supraharmonic measurementBroadband current distortion
Supraharmonic propagationPrimary + secondary emission real measurements
EV-1 EV-2 EV-3 EV-4
10.0kHz -
10.0 kHz
45.0 - 50.0 kHz
Z Z Z
EV-1 EV-3
Supraharmonic interactionFrequency beating
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Supraharmonic interactionIntermodulation distortion
Measurements on Fast (DC) chargers
Fast (DC) chargers
Inductive charging
• Supraharmonic emissions occur, by EVs, DC chargers and inductive chargers of different
magnitude and different frequencies
• Emissions not necessarily fixed on one freq. -> broadband and reflections
• Smart charging can change behaviour
• Hard to pinpoint source, current measurements required
• Interference between supraharmonics possible;
o Beating effect
o Intermodulation
Learnings
Next steps
Need for comprehensive standards in 2-150kHz range
But what should be the limit for supraharmonics?What is their true impact? How far do they propogate?
Standardization on (supra-)harmonicmeasurements- How to measure?
- LISN/AMN
- Compliance with limits- Lab vs in field
- Interaction
Current PQ research
• TEPQEV project• Research on PQ impact charging
electric vehicles and how to model this
• Progressus project• Research on reducing PQ impact
during AC/DC conversion
• Universities• TU Eindhoven
• Lulea University
• TU Dortmund
• TU Dresden
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ElaadNLUtrechtseweg 310 B426812 AR ArnhemThe Netherlands+31 (0) 26 312 02 23
Contact [email protected]@elaad.nlwww.elaad.nlTwitter @ElaadNLfacebook.com/ElaadNLYoutube Channel: ElaadNL
Visit us at the CNrood stand!Contact us for more information about testing and PQ research