Abstract
In the application of rail transit vehicles, when using typical wireless power transfer (WPT) systems with series–series (SS) compensation supply power for supercapacitors, the output current is in an approximately inverse relationship with the duty cycle in a wide range. This renders the typical buck circuit control inappropriate. In order to help resolve the above issues, this paper designs inductor/capacitor/capacitor (LCC) compensation with new compensation parameters, which can achieve an adjustable quasi-constant voltage from the input of the inverter to the output of the rectifier. In addition, the two-port network method is used to analyze the resonant compensation circuit. The analysis shows that LCC compensation is more suitable for the WPT system using the supercapacitor as the energy storage device. In the case of LCC compensation topology combined with the charging characteristics of the supercapacitor, an efficient charging strategy is designed, namely first constant current charging, followed by constant power charging. Based on the analysis of LCC compensation, the system has an optimal load, by which the system works at the maximum efficiency point. Combined with the characteristics of the constant voltage output, the system can maintain high efficiency in the constant power stage by making constant output power the same as the optimal power point. Finally, the above design is verified through experiments.
Highlights
Wireless power transfer (WPT) systems have been widely developed for applications to rail transit vehicles because they avoid direct electrical connection, which can help eliminate the danger of electrical sparks and provide automatic power supply [1,2,3,4]
Some initiatives (Bombardiers PRIMOVE and South Koreas KAIST) have introduced the wireless power transfer (WPT) technology power supply mode combined with the energy storage-type tram [5,6] to provide more convenient and safe traffic vehicles
The WPT system renders the power supply safer and more reliable, reducing the influence of environmental conditions. For this type of WPT system applied in rail transit vehicles, a three-phase rectifier is used to convert the grid alternating current (AC) to the direct current (DC) bus voltage
Summary
Wireless power transfer (WPT) systems have been widely developed for applications to rail transit vehicles because they avoid direct electrical connection, which can help eliminate the danger of electrical sparks and provide automatic power supply [1,2,3,4]. Some initiatives (Bombardiers PRIMOVE and South Koreas KAIST) have introduced the WPT technology power supply mode combined with the energy storage-type tram [5,6] to provide more convenient and safe traffic vehicles. Such vehicles do not require a large number of energy storage devices, and this can help make the vehicle more lightweight. The WPT system renders the power supply safer and more reliable, reducing the influence of environmental conditions For this type of WPT system applied in rail transit vehicles, a three-phase rectifier is used to convert the grid alternating current (AC) to the direct current (DC) bus voltage.
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