Impact on the Power Grid Caused via Ultra-Fast Charging Technologies of the Electric Buses Fleet

Mohammed Al-Saadi, Mohammed Al-Saadi, Sharmistha Bhattacharyya, Pierre Van Tichelen, Manuel Mathes, Johannes Käsgen , Joeri Van Mierlo, Joeri Van Mierlo, Maitane Berecibar

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Battery Electric Buses (BEBs) are considerably integrated into cities worldwide. These
buses have a strict schedule; thus, they could be charged in a very short time with a power level up
to 600 kW. The high-power systems and short charging times imply special grid operation conditions
that should be taken into account. Therefore, it is necessary to consider the influence of their charging
infrastructure on the distribution system operation, especially near the charging point. This work
presents two Use Cases (UCs) from two demos (Germany and the Netherlands) to investigate the
impact of the slow and fast-chargers’ integrations on the power grid and environment. Fast-chargers
up to 350 kW based on pantograph technology and slow-chargers up to 50 kW based on Combined
Charging System Type 2 (CCS2) are used on the BEB line route and in the depot, respectively. The
charging of BEBs with these solutions is studied here to investigate their impact on the grid in terms
of power quality. It was found that the voltage variations due to fast-chargers terminal remain much
below the EN50160 standard limit values i.e., ±10%. The obtained maximum Total Harmonic Voltage
Distortion (THDv) value is 2.7%, with an average value of 1.3%, which is below the limit value of
8%, as per the standard EN 50160. Similarly, the individual harmonic currents were measured. The
maximum value of total harmonic current distortion (THDI) is around 25%, with an average value
of 3% only. As the average value of THDI is quite low, the harmonic current pollution is not a big
concern for the installation at this time.
Original languageEnglish
Article number1424
Pages (from-to)1
Number of pages16
JournalEnergies
Volume15
Issue number4
DOIs
Publication statusPublished - 15 Feb 2022

Keywords

  • heavy-duty electric vehicles; electric buses; impact on the grid; power quality; harmonics; ultra-fast charging; fast-chargers; slow-chargers; pantograph; CCS2

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