Abstract
With the recent proliferation of electric vehicles (EVs), maintaining power quality within acceptable limits in future distribution grids will become a challenging task. A specific concern is the spread of Supraharmonics in the range from 2 to 150 kHz, generated by modern power electronic devices. In this paper, the long term Supraharmonic distortion from three differently sized electric vehicle charging infrastructures is analyzed in frequency and time domain. At the monitored sites several interruptions of EV charging processes were observed due to poor power quality. It was found that vehicles disconnect when exposed to high levels of harmonic distortion. Moreover, the impact of the charging EVs on the Supraharmonic distortion and the interaction with the background distortion for the individual sites is discussed. Results show that a general increase in Supraharmonics emission can be expected due to the rising number of EVs. However, measurements also indicate that damping effects can occur for certain load configurations.
Highlights
The successful integration of electric vehicles (EVs) is a challenging task to implement the shift towards a more sustainable transport sector
This is one of the key aspects concluded by the CIGRE JWG 4.24 [2] (“PQ and EMC Issues with future electricity networks”), stating that the ongoing proliferation of power electronic devices will have a significant impact on the design and operation of future power systems
The long-term Supraharmonic emission of three different sized EV charging infrastructures was analyzed in time and frequency domain
Summary
The successful integration of electric vehicles (EVs) is a challenging task to implement the shift towards a more sustainable transport sector. It is shown in [16,18] that the Supraharmonic distortion and interaction of power electronic devices are highly affected by the number and configuration of connected devices and the grid impedance This is presented in detail by the authors of [18], presenting the Supraharmonics emission characteristics for different load configurations. The large number of influencing factors on the Supraharmonic distortion in-field, such as varying grid impedance and dependency on the load behavior, can only be considered with adequate measurement data sizes. Simple rectifier circuits, such as two-pulse diode rectifiers, do not have integrated means for adjusting the power factor. A high pass filter with an event detection was implemented on the installed measurement devices, allowing a characterization of the time-domain properties of the Supraharmonic distortion
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