Y. B. FAN ET AL.
Copyright © 2013 SciRes. EPE
1343
(d) Time-varying trend of the odd harmonic current content
throughout the charging process
Figure 9. Harmonic Current.
Figure 10. Charger AC side 0-10 kHz current harmonic
spectrum.
10) Higher Harmonic Phenomenon
Conclusion: The preceding analysis shows that the
low-order harmonics of the off-board charger is very low,
which is in line with relevant international standards. But
Figure 10 shows that there is also higher harmonic,
mainly distributing around 6650 kHz
5. Conclusions
After monitoring the charging process of single-board
charger in electric vehicles charging station, and evaluating
the testing results, we can draw conclusions as follows:
1) Electric vehicle battery is the capacitive load. It can
export reactive power when charging.
2) In the charging process of the off-board charger, in-
dicators of voltage deviation, frequency deviation, power
factor, and voltage distortion rate are qualified.
3) Off-board charger produces odd harmonics in the
charging process, and with increasing harmonic order,
harmonic content reduces. There is a certain amount of
high-order harmonic in off-board charger, mainly dis-
tributing around 6650 kHz.
4) Generated harmonics of the actual device, the har-
monic is mainly reflected in the current, voltage, only a
small distortion.
In fact it also shows that in the actual grid operation, to
ensure that the grid power quality standards, vehicle
charging station will consider providing compensation
device and filtering device in associated distribution sys-
tem.
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