Wireless power transfer tuning model of electric vehicles with pavement materials as transmission media for energy conservation. (1st October 2022)

• Record Type: Journal Article
• Authors: Li, Feng; Li, Yanjie; Zhou, Siqi; Chen, Yifang; Sun, Xuan; Deng, Yutong
• Is Part Of: Applied energy. Volume 323(2022)
• Publication Date: 2022-10-01
• Subjects: Wireless Power Transfer -- Resonant magnetic induction coupling -- Pavement materials -- Circuit detuning -- Simulation; Power (Mechanics) -- Periodicals; Energy conservation -- Periodicals; Energy conversion -- Periodicals; 621.042
• DOI: 10.1016/j.apenergy.2022.119631
• Languages: English
• ISSNs: 0306-2619

Abstract

Highlights: WPT combined with pavement materials for long durability. Detuning of resonant circuit and deficiency of power and efficiency caused by pavement materials as transmission media. Adjust the voltage frequency to restore the resonance of the circuit to enhance the power and efficiency. Power and efficiency prediction formulae containing pavement material factors. Abstract: Wireless power transfer (WPT) is one of the ways to alleviate the charging difficulties of electric vehicles, accelerating the growth of ownership of electric vehicles to replace petrol vehicles towards carbon net zero in transportation. In order to ensure the durability of the primary circuits of WPT and prevent the circuits to become obstacles for driving, the primary circuits need to be buried in the pavement structure. However, pavement materials can adversely affect the resonant induction coupling process of WPT, reducing the power and efficiency of charging. In order to explore the influence of the type and thickness of pavement materials on the WPT, vibrating sample magnetometer was used to test the magnetization performance of raw materials of pavement. The effective relative permeability of the three most commonly used pavement materials, including AC-13, SMA-13 and PCC, was calculated according to the magnetic circuit model. The simulation models of primary coil, secondary coil and pavement materials were established in Ansys Maxwell software. The self-inductance and mutual inductance of the coils after inserting pavement materials were obtained. The output power and transmission efficiency of WPT were calculated according to the theoretical calculation formulae. The results showed that inserting pavement materials between the primary and secondary coil as transmission media enhanced the primary self-inductance, secondary self-inductance and mutual inductance, leading to the detuning of resonant circuit and the reduction of output power. After adjusting the frequency of the high-frequency voltage to the resonant frequency, the output power of WPT was improved. Among the three materials, the output power was the highest when AC-13 was used. In addition, the calculation formulae of resonance frequency, output power and efficiency after introducing pavement materials were given, providing calculation basis for the design of WPT pavement.