Metrology for Inductive Charging of Electric Vehicles (MICEV)

Abstract

The European Union funded project MICEV aims at improving the traceability of electrical and magnetic measurement at charging stations and to better assess the safety of this technology with respect to human exposure. The paper describes some limits of the instrumentation used for electrical measurements in the charging stations, and briefly presents two new calibration facilities for magnetic field meters and electric power meters. Modeling approaches for the efficiency and human exposure assessment are proposed. In the latter case, electromagnetic computational codes have been combined with dosimetric computational codes making use of highly detailed human anatomical phantoms in order to establish human exposure modeling real charging stations. Detailed results are presented for light vehicles where, according to our calculations, the concern towards human exposure is limited. Currently, the project has reached half way point (about 18 months) and will end in August 2020.

Assessment of Exposure to Electric Vehicle Inductive Power Transfer Systems: Experimental Measurements and Numerical Dosimetry

“…The coil layout for both probes is illustrated in Figure 4. Both probes were calibrated in accordance with the on-site measurement conditions at the National Physical Laboratories (NPL) facility (meter with 100 cm 2 probe) [22], and at the Istituto Nazionale di Ricerca Metrologica (INRiM) facility (meter with 3 cm 2 probe) [27]. The meter with the 100 cm 2 probe demonstrated an instrument error <1% for indicated fields greater than 0.4 µT (see Section 2.3.4), while the meter with the 3 cm 2 probe showed a higher error up to 5%.…”

“…The accuracy of the charging station modeling was of significant importance for the dosimetric analysis. In this study, the two charging stations were modeled with two previously tested software approaches, along with four other 2D and 3D computational codes on an axisymmetric geometry [22]. In the testing situation presented in [22], the software discrepancies were lower than 6%.…”

“…In this paper, we report the results obtained in the framework of a wide European project [22] that aims to extend the published analysis for the cases of a car and a bus operating on a virtual and on a real charging station, respectively, through measurements and calculations in order to evaluate the exposure of the occupants and bystanders. The aim of the project is to develop high-accuracy measurement systems, calibration facilities, and models to ensure traceability of the magnetic field measurements performed on static and dynamic IPT systems for charging light and heavy EVs.…”

Dynamic Wireless Power Transfer Charging Infrastructure for Future EVs: From Experimental Track to Real Circulated Roads Demonstrations

“…Reference [52] has recently defined limit power for WPT systems operating at 85 kHz. Reference [53] aimed to improve measurement methods, dosimetric models and phantoms of such measurement in vehicle inductive charging systems.…”

A Measurement System for the Characterization of Wireless Charging Stations for Electric Vehicles

“…This article deals with a measuring system developed for measuring the power transferred onboard, the power transferred to the batteries, the losses at the power converters, and the overall efficiency of the system. The system is called in the following the Power Measurement Unit (PwMU), and it was developed within the project "Metrology for Inductive Charging of Vehicles" (MICEV) [14]. The system allows synchronized measurements onboard and on the ground and allows the simultaneous detection of magnetic induction levels in and around the vehicle.…”