scholarly journals Decentralized Electric Vehicle Charging Strategies for Reduced Load Variation and Guaranteed Charge Completion in Regional Distribution Grids

Energies ◽  
2017 ◽  
Vol 10 (2) ◽  
pp. 147 ◽  
Author(s):  
Weige Zhang ◽  
Di Zhang ◽  
Biqiang Mu ◽  
Le Wang ◽  
Yan Bao ◽  
...  
Keyword(s):  
Electric Vehicle ◽  
Regional Distribution ◽  
Load Variation ◽  
Electric Vehicle Charging ◽  
Vehicle Charging ◽  
Distribution Grids

scholarly journals Distributed Optimization-based Electric Vehicle Charging and Discharging in Unbalanced Distribution Grids

2021 ◽  
Author(s):  
Nanduni Nimalsiri ◽  
Elizabeth Ratnam ◽  
David Smith ◽  
Chathurika Mediwaththe ◽  
Saman Halgamuge
Keyword(s):  
Numerical Simulations ◽  
Electric Vehicle ◽  
Distributed Optimization ◽  
Electric Vehicle Charging ◽  
Vehicle Charging ◽  
Distribution Grids

Numerical simulations are carried out on the IEEE 13 node test feeder.

scholarly journals Operation of Battery Storage as a Temporary Equipment During Grid Reinforcement Caused by Electric Vehicles

Electronics ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 888
Author(s):  
Lukas Held ◽  
Sebastian Baumann ◽  
Michael R. Suriyah ◽  
Thomas Leibfried ◽  
Levin Ratajczak ◽  
...  
Keyword(s):  
Electric Vehicle ◽  
Electric Vehicles ◽  
Input Data ◽  
Battery Storage ◽  
Electric Vehicle Charging ◽  
Vehicle Charging ◽  
Grid Reinforcement ◽  
Distribution Grids

Electric vehicle charging stresses distribution grids significantly with high penetrations of electric vehicles. This will lead to grid reinforcement works in several distribution grids. Battery storage is a possible solution to bypass times of grid reinforcement due to electric vehicle charging. In this paper, different operation strategies for such a battery storage are tested at first in simulations. The main difference between the strategies is the necessary input data. Following the simulations, selected strategies are tested in reality in the project ”Netzlabor E-Mobility-Allee”. It is proved that battery storage is a functioning possibility to bypass times of grid reinforcement.

scholarly journals Characterization of Supraharmonic Emission from Three Different Electric Vehicle Charging Infrastructures in Time and Frequency Domain

Energies ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 394
Author(s):  
Tim Streubel ◽  
Christoph Kattmann ◽  
Adrian Eisenmann ◽  
Krzysztof Rudion
Keyword(s):  
Electric Vehicle ◽  
Power Quality ◽  
Harmonic Distortion ◽  
Electric Vehicle Charging ◽  
Vehicle Charging ◽  
The Individual ◽  
The Impact ◽  
Distribution Grids

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.

Coordinated Electric Vehicle Charging With Reactive Power Support to Distribution Grids

2019 ◽  
Vol 15 (1) ◽  
pp. 54-63 ◽  
Author(s):  
Jingyuan Wang ◽  
Guna R. Bharati ◽  
Sumit Paudyal ◽  
Oguzhan Ceylan ◽  
Bishnu P. Bhattarai ◽  
...  
Keyword(s):  
Electric Vehicle ◽  
Reactive Power ◽  
Electric Vehicle Charging ◽  
Vehicle Charging ◽  
Distribution Grids

Reactive power support in residential LV distribution grids through electric vehicle charging

2015 ◽  
Vol 3 ◽  
pp. 24-35 ◽  
Author(s):  
Niels Leemput ◽  
Frederik Geth ◽  
Juan Van Roy ◽  
Jeroen Büscher ◽  
Johan Driesen
Keyword(s):  
Electric Vehicle ◽  
Reactive Power ◽  
Electric Vehicle Charging ◽  
Vehicle Charging ◽  
Distribution Grids

scholarly journals Voltage-Based Droop Control of Electric Vehicles in Distribution Grids under Different Charging Power Levels

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3905
Author(s):  
Muhandiram Arachchige Subodha Tharangi Ireshika ◽  
Ruben Lliuyacc-Blas ◽  
Peter Kepplinger
Keyword(s):  
Electric Vehicle ◽  
Electric Vehicles ◽  
Control Mechanism ◽  
Droop Control ◽  
Distribution Grid ◽  
Electric Vehicle Charging ◽  
Charging Control ◽  
Vehicle Charging ◽  
The Impact ◽  
Distribution Grids

If left uncontrolled, electric vehicle charging poses severe challenges to distribution grid operation. Resulting issues are expected to be mitigated by charging control. In particular, voltage-based charging control, by relying only on the local measurements of voltage at the point of connection, provides an autonomous communication-free solution. The controller, attached to the charging equipment, compares the measured voltage to a reference voltage and adapts the charging power using a droop control characteristic. We present a systematic study of the voltage-based droop control method for electric vehicles to establish the usability of the method for all the currently available residential electric vehicle charging possibilities considering a wide range of electric vehicle penetrations. Voltage limits are evaluated according to the international standard EN50160, using long-term load flow simulations based on a real distribution grid topology and real load profiles. The results achieved show that the voltage-based droop controller is able to mitigate the under voltage problems completely in distribution grids in cases either deploying low charging power levels or exhibiting low penetration rates. For high charging rates and high penetrations, the control mechanism improves the overall voltage profile, but it does not remedy the under voltage problems completely. The evaluation also shows the controller’s ability to reduce the peak power at the transformer and indicates the impact it has on users due to the reduction in the average charging rates. The outcomes of the paper provide the distribution grid operators an insight on the voltage-based droop control mechanism for the future grid planning and investments.

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