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

Zucca, M.; Squillari, Paolo; Pogliano, U.

doi:10.1109/tim.2020.3046908

Cited by 15 publications

(5 citation statements)

References 16 publications

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“…The EURAMET MICEV project (https://micev.eu, accessed on 30 November 2023) was dedicated to the metrology of WPT systems for EV charging. In particular, a measurement system for the on-site characterization of wireless charging stations was developed that is capable of verifying its efficiency by measuring the power supplied and propagated from the electricity grid to the AC/DC converter, the DC/AC converter, the transmitter coil, the receiver coil, the AC/DC converter, and the DC/DC converter feeding the battery of an EV [17]. Nevertheless, the project did not target techniques that could be used to measure the power delivered to the EV side without measuring current and voltage on the EV board.…”

Section: Introductionmentioning

confidence: 99%

A Measurement Method of Power Transferred to an Electric Vehicle Using Wireless Charging

Nakutis,

Lukočius,

Girdenis

et al. 2023

Sensors

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The increasing number of zero-emission vehicles on the roads demands novel vehicle charging solutions that ensure convenience, safety, increased charging infrastructure availability, and aesthetics. Wireless charging technology is seen as the one that could assure these desirable properties and could be applied not just in conventional implementations but also in off-grid solutions together with roadway energy harvesting systems. Both approaches require proper transfer of energy metering methods. In this paper, a method for measuring the power transferred to the load in a wireless charging system is presented, and its systematic error is assessed in the relevant range of influencing factors. The novelty of the method is that it does not require any metrologically certified measurement instrumentation on the receiver side of the wireless charging system. The error analysis is performed using a numerical simulation. Considered error-influencing factors included secondary side electrical load, coils’ coupling coefficient and quality factor, current and voltage quantization resolution, and compensation topology type (serial-serial (SS) and serial-parallel (SP)). It was determined that the systematic error of the power assessment does not exceed 0.7% for SS and 1.1% for SP topologies when the coupling coefficient is in the range of 0.05 to 0.4 and the quality factor of the resonant system is in the range of 100 to 800.

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Section: Introductionmentioning

confidence: 99%

A Measurement Method of Power Transferred to an Electric Vehicle Using Wireless Charging

Nakutis,

Lukočius,

Girdenis

et al. 2023

Sensors

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show abstract

“…Wireless charging for EVs also uses the WPT and can be accomplished in three different ways i.e. static or stationary wireless charging system (SWCS), semi or quasi dynamic wireless charging system (QDWCS) and dynamic wireless charging system (DWCS) [27,28]. In SWCS, the WPT is used for the charging of a stationary EV.…”

Section: Introductionmentioning

confidence: 99%

Wireless charging systems for electric vehicles

Amjad

Farooq-i-Azam

et al. 2022

Renewable and Sustainable Energy Reviews

101

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“…A first measurement system of the power transferred from the transmitter (Tx) coil to the receiver (Rx) coil was proposed in [16]. An ad hoc measurement system has been proposed by the authors in [17,18] in order to have accurate and traceable measurements of the electrical quantities on-board and on the grid side at WPT EVSE, as well as of the transmission efficiency with an expanded measurement uncertainty, at room temperature, lower than or equal to 10 −3 . High-powered EVSE, for example for trucks or buses, necessarily require an on-site verification with the desirable presence of the vehicle (an equivalent load for such a power is rarely available).…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, a large EVSE cannot be placed in a climatic room in a laboratory to assess the temperature effect on the electrical quantities, the harmonic distortion effect and efficiency assessment [19]. This paper moves from two of the four measurement systems described in [17,18], one for on-board measurements and one for grid measurements, aiming at establishing a method to define the accuracy of on-site measurements. This paper proposes a clear procedure to assess the accuracy of the efficiency measurements in WPT EVSE.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Overall Efficiency in WPT Stations for Electric Vehicles

et al. 2021

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The on-site assessment of the efficiency of a charging station is not a trivial process and is a topic of discussion for professionals. The efficiency of electric Vehicle Supply Equipment (EVSE), is an important parameter for both the user and the EVSE operator. This paper deals with a particular type of EVSE, using static wireless power transfer (WPT). This paper proposes a clear method to account for the parameters which can affect the correct determination of efficiency, such as in particular the accuracy of the meters and the effect of temperature. This work proposes a method to define the accuracy of the power and efficiency on-site assessment, and is aimed at clarifying that despite distorted waveforms at the charging stations, it is possible to reach a good accuracy in a wide temperature span (expanded uncertainty <0.5% between 5∘C and 40∘C). Analysis initiated from the measurement conditions and the actual waveforms recorded at two WPT EVSEs with differently rated power. This paper paves the way for the possibility of verifying class 0.5 meters on-site, desirable for this type of application. The paper also clarifies that despite the evident presence of voltage and current ripple at the batteries, the weight of the ripple power on the total power is nevertheless lower than 0.1%. Finally, the paper highlights how, for the correct measurement of the ripple, it would be advisable to calibrate the instrumentation in DC and in AC, at a frequency double that of the working frequency of the EVSE coils.

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

Cited by 15 publications

References 16 publications

A Measurement Method of Power Transferred to an Electric Vehicle Using Wireless Charging

A Measurement Method of Power Transferred to an Electric Vehicle Using Wireless Charging

Wireless charging systems for electric vehicles

Assessment of the Overall Efficiency in WPT Stations for Electric Vehicles

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