Abstract
High-power DC electric vehicle supply equipments (EVSE) have a significant impact on voltage stability in low-voltage networks. To ensure the guaranteed voltage characteristics, utility grid operator permit the installation of DC-EVSE only in proximity of local substations. A simplified grid access strategy for DCEVSE is achievable by reactive power support of the EVSE rectifier system. Since decentralized regenerative energy (DRE) already provide voltage band control using reactive power support in lowvoltage networks, the interaction of DRE and EVSE reactive power compensation scheme is investigated. To enhance power converters operation, a fast reacting voltage-droop control concept for DRE and EVSE is proposed for rapid voltage change mitigation. The applicability of a voltage-droop control is verified using probabilistic simulations.
Highlights
1.1 Public Electric Vehicle FastCharging InfrastructureThe majority of Electric Vehicle (EV) trips can be covered by normal power recharging offering an AC connection power from 3,7 kW up to 22 kW
To enhance power converters operation, a fast reacting voltage-droop control concept for decentralized regenerative energy (DRE) and electric vehicle supply equipments (EVSE) is proposed for rapid voltage change mitigation
Connecting fast-charging DC electric vehicle supply equipment (EVSE) to a low-voltage (LV) network has a significant impact on power quality
Summary
The majority of Electric Vehicle (EV) trips can be covered by normal power recharging offering an AC connection power from 3,7 kW up to 22 kW. To fulfill the requirements of long distance trips and flexible spontaneous route planning, a fast charging infrastructure is necessary. For 2020, a demand for a public charging infrastructure consisting of 173.000 normal power recharging points (22 kW, AC charging) und 7.100 high power recharging points (50 kW, DC charging) is predicted in Germany [1]. Connecting fast-charging DC electric vehicle supply equipment (EVSE) to a low-voltage (LV) network has a significant impact on power quality
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