Sensitivity analysis of a bidirectional wireless charger for EV

Abstract

Abstract-Bidirectional chargers are required to fully integrate Electric Vehicle (EV) into the smart grids. Additionally, wireless chargers ease the charge/discharge process of the EV batteries so that they are becoming more popular to fulfill a V2G scenario. When considering the load of wireless chargers, it is a requirement to know the real output power that these systems offer. The designed output power may differ from the real one as components suffer from tolerance. This paper defines six sensitivity factors to model the severity of the effects of tolerance into the output power. To do so, an electric circuit analysis is used and a mathematical formulation is derived. The six sensitivity factors are computed for a laboratory prototype.

Dynamic Wireless Power Transfer with a Resonant Frequency for Light Duty Electric Vehicle

“…This causes the resonance frequency to change which affects the wireless power transfer efficiency. Therefore, there is a way to improve the resonance circuit to be able to the maximum transfer power [12]. The compensation topology for the LCC resonance circuit.…”

Frequency Tuning in Inductive Power Transfer Systems

“…The actual values of the IPTS reactive elements may differ from the designed ones at the assembly time, because of the manufacturing tolerances, as well as during the operating life because of the drift due, for instance, to their ageing. This gives rise to a frequency mismatch in (9) and IPTS ideal resonant operation is lost in the transmitting and/or receiving stage.…”

“…The drift of the IPTS' reactive elements (coils and networks components) and manufacturing tolerances can deviate the resonance frequency of the stages from the supply frequency, thus affecting the performance of the IPTS. Some papers studied how the loss of resonance affects the output power of the system [9] and other considered also its effects on the efficiency [10], but they did not propose countermeasures aimed to regain a satisfactory level of efficiency. In literature, two approaches to resonance restoration are found: some authors keep the supply frequency constant and act on the reactive parameters of the coils or of the compensation networks to achieve the resonance [11][12][13]; other authors, instead, adjust the supply frequency to reach a given performance index [14][15][16][17].…”

On The Strategies for the Diffusion of EVs: Comparison between Norway and Italy

“…On the other hand, the aim to decarbonize the transport sector through electrification has to consider the energy efficiency of both the electricity production and the energy use. One of the main potentially of the Italy is due to high diffusion of solar energy, which can produce electric energy in the same charging stations [21,[25][26][27][28][29][30]. In such a way the emissions reduction, primary aim of the employment of EVs, can be linked to the transport efficiency, expressed as the ratio of energy used per vehicle-km, that can be remodeled in low emission transport efficiency: a reduced number of EVs will employ decarbonized energy.…”