Abstract
Dynamic wireless charging for electric vehicles is an emerging technology to provide an alternative solution for onboard battery reduction and driving range extension. Because of their unique characteristic of very short charging times and relatively high power levels, high-power dynamic wireless charging systems (DWCSs) introduce significant challenges to grid integration. In this paper, a comprehensive study of the high-power DWCS on grid integration control and impact analysis into distribution networks is conducted. Due to the unique load profile of DWCSs with power pulsations and the inherent imbalanced situations of a distribution network, a control strategy based on direct power control is proposed for the grid interface of DWCS to enhance the load transient response and ensure the stable operation. Considering that the load profile of DWCSs closely relates to traffic volumes and the approaching vehicle speeds, a 24-h load profile is developed based on Annual Average Daily Traffic (AADT) data and a stochastic model to analyze the grid impact of high-power DWCSs in a distribution network. Case studies on a modified IEEE 13-bus distribution network are presented to validate the effectiveness of the proposed approach.
Highlights
As transportation electrification has attracted wide attention in recent decades for reducing greenhouse gas emissions and mitigating air pollution, electric vehicles (EVs) are becoming a promising alternative to conventional gasoline vehicles
To improve the load transient response capability and alleviate the influence of imbalanced distribution networks on the stability of the entire system, a control strategy based on direct power control and charging power feed-forward control is proposed to maintain the dc-bus voltage stability under the power pulsation from dynamic wireless charging systems (DWCSs)
Considering the unique pulse-like load characteristics of DWCSs, a control strategy based on direct power control is proposed to enhance the load transient response capability of the grid interface converter in a DWCS
Summary
As transportation electrification has attracted wide attention in recent decades for reducing greenhouse gas emissions and mitigating air pollution, electric vehicles (EVs) are becoming a promising alternative to conventional gasoline vehicles. In another study [18], ES and PV were integrated to show their benefits to smoothen the load profile of DWCS system These papers investigated the potential impacts of DWCSs on distribution networks, none of them analyzed the effect of the power pulsations caused by DWCSs on the grid interface converter. To evaluate the grid impact of high-power DWCS on distribution networks, in the second part, a 24-h load profile is developed based on the load demand of a single vehicle and the 24-h traffic model. To improve the load transient response capability and alleviate the influence of imbalanced distribution networks on the stability of the entire system, a control strategy based on direct power control and charging power feed-forward control is proposed to maintain the dc-bus voltage stability under the power pulsation from DWCS.
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