Abstract
The EV penetration in the low voltage residential grids is expected to increase rapidly in the coming years. It is expected that EV consumers will prefer overnight home charging because of its convenience and lack of charging infrastructure. The EV battery chargers are nonlinear loads and likely to increase the current harmonic emission in the distribution network. The imminent increase of EV load requires upgrading or managing the existing power system to support the additional charging load. This paper provides the estimation of the current harmonic emission of the EV charging load at different voltage distortions using the stochastic EV load model. The impact of EV charging on the distribution transformer is also presented.
Highlights
The transport sector is responsible for 24% of the total CO2 emission globally, while road transportation has the largest share and accountable for 75% of the emission from transport
The modern battery chargers provide low total current harmonic distortion (THDi) with harmonic content under the limits defined by the relevant standards, the high penetration of electric vehicles (EV) may result in large aggregated harmonic currents
A method is proposed in this paper to estimate the current harmonic emission of electric vehicles
Summary
The transport sector is responsible for 24% of the total CO2 emission globally, while road transportation has the largest share and accountable for 75% of the emission from transport. DC for charging; power electronic converters are employed for AC to DC conversion and charging control These converters present nonlinear load to the distribution grid as they draw non-sinusoidal currents with high-frequency harmonics. The modern battery chargers provide low total current harmonic distortion (THDi) with harmonic content under the limits defined by the relevant standards, the high penetration of EV may result in large aggregated harmonic currents. It may result in high voltage distortion that can affect the performance and harmonic emission of the other loads connected to the network.
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