Sensitivity Analysis of a Polyphase Wireless Power Transfer System Under Off-Nominal Conditions

Ahmet Aktas; Omer C. Onar; Erdem Asa; Mostak Mohammad; Burak Ozpineci; Leon M. Tolbert

doi:10.1109/TTE.2023.3340692

Sensitivity Analysis of a Polyphase Wireless Power Transfer System Under Off-Nominal Conditions

Ahmet Aktas, Omer C. Onar, Erdem Asa, Mostak Mohammad, Burak Ozpineci, Leon M. Tolbert

Research output: Contribution to journal › Article › peer-review

Abstract

— Misaligned and/or variable coil air gaps cause coupling coefficient variation in wireless power transfer (WPT) systems, resulting in a decrease in the system’s transmitted power and efficiency. This article presents sensitivity analyses of a three-phase, Y–Y-connected, series-tuned WPT system in the frequency domain in terms of several different electric vehicle (EV) wireless charging off-nominal conditions (misalignments in 1x- and 1y-directions, change of air gap 1z, and the roll 1ψ, pitch 1θ, and yaw 18 angles) as specified in the Society of Automotive Engineers (SAE) J2954 Standard. Coil inductance matrices were obtained by measuring the self- and mutual inductances of the primary and secondary coil phase windings at variable air-gap classes (from 5 to 30 cm) for five different charging positions as identified in SAE J2954. These 6 × 6 inductance matrices were used in sensitivity and Plexim/PLECS simulation analyses. The sensitivity of the WPT system was analyzed analytically using the input impedance and phase angle, voltage gain, current gain, quality factor, and coupling coefficient parameters of the series-tuned WPT system. The results were confirmed experimentally on a 50-kW WPT system.

Original language	English
Pages (from-to)	6690-6706
Number of pages	17
Journal	IEEE Transactions on Transportation Electrification
Volume	10
Issue number	3
DOIs	https://doi.org/10.1109/TTE.2023.3340692
State	Published - 2024

Funding

This work was supported by Vehicle Technologies Office, U.S. Department of Energy. The work of Ahmet Aktas was supported by The Scientific and Technological Research Council of T\u00FCrkiye (TUBITAK) within the scope of 2219\u2014International Postdoctoral Research Fellowship Program. This research used the resources available at the Power Electronics and Electric Machinery Research Center at the National Transportation Research Center, a U.S. Department of Energy (DOE) Office of Energy Efficiency and Renewable Energy user facility operated by Oak Ridge National Laboratory (ORNL), Oak Ridge, TN, USA. The authors would like to thank Lee Slezak (Vehicle Technologies Office, U.S. Department of Energy) for his support and guidance.

Funders	Funder number
Power Electronics and Electric Machinery Research Center
Office of Energy Efficiency and Renewable Energy
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu
Lee Slezak
Vehicle Technologies Office
U.S. Department of Energy

Keywords

Coupling coefficient
electric vehicle (EV)
polyphase wireless power transfer (WPT)
sensitivity analysis
wireless charging

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title = "Sensitivity Analysis of a Polyphase Wireless Power Transfer System Under Off-Nominal Conditions",

abstract = "— Misaligned and/or variable coil air gaps cause coupling coefficient variation in wireless power transfer (WPT) systems, resulting in a decrease in the system{\textquoteright}s transmitted power and efficiency. This article presents sensitivity analyses of a three-phase, Y–Y-connected, series-tuned WPT system in the frequency domain in terms of several different electric vehicle (EV) wireless charging off-nominal conditions (misalignments in 1x- and 1y-directions, change of air gap 1z, and the roll 1ψ, pitch 1θ, and yaw 18 angles) as specified in the Society of Automotive Engineers (SAE) J2954 Standard. Coil inductance matrices were obtained by measuring the self- and mutual inductances of the primary and secondary coil phase windings at variable air-gap classes (from 5 to 30 cm) for five different charging positions as identified in SAE J2954. These 6 × 6 inductance matrices were used in sensitivity and Plexim/PLECS simulation analyses. The sensitivity of the WPT system was analyzed analytically using the input impedance and phase angle, voltage gain, current gain, quality factor, and coupling coefficient parameters of the series-tuned WPT system. The results were confirmed experimentally on a 50-kW WPT system.",

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AB - — Misaligned and/or variable coil air gaps cause coupling coefficient variation in wireless power transfer (WPT) systems, resulting in a decrease in the system’s transmitted power and efficiency. This article presents sensitivity analyses of a three-phase, Y–Y-connected, series-tuned WPT system in the frequency domain in terms of several different electric vehicle (EV) wireless charging off-nominal conditions (misalignments in 1x- and 1y-directions, change of air gap 1z, and the roll 1ψ, pitch 1θ, and yaw 18 angles) as specified in the Society of Automotive Engineers (SAE) J2954 Standard. Coil inductance matrices were obtained by measuring the self- and mutual inductances of the primary and secondary coil phase windings at variable air-gap classes (from 5 to 30 cm) for five different charging positions as identified in SAE J2954. These 6 × 6 inductance matrices were used in sensitivity and Plexim/PLECS simulation analyses. The sensitivity of the WPT system was analyzed analytically using the input impedance and phase angle, voltage gain, current gain, quality factor, and coupling coefficient parameters of the series-tuned WPT system. The results were confirmed experimentally on a 50-kW WPT system.

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Sensitivity Analysis of a Polyphase Wireless Power Transfer System Under Off-Nominal Conditions

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