Modeling and Parametric Study of Electric Vehicle Charging via WiTricity. A Multiple Harmonic Analysis

Technological challenges to the widespread adoption of battery-powered devices contain substantial weight with a high cost and low power density. To bring an improvement in over-dependency on batteries, wireless power transfer is a ray of hope in energizing electric-driven devices. Moreover, for high voltage transmission lines, optimization of natural frequency plays an important role in efficient wireless power transfer (WPT) considering dc to load supply. In consideration of different aspects of wireless power transfer technology, a completely optimized method should be adapted for monitoring. In the present work, a model of an electric car vehicle has been developed based on WiTricity. This concept of wireless power transfer has been realized in this work as a small-scale simulated model, which can be used to charge batteries, mobile, door locks, and propeller clocks, Further, the evolving wireless power transfer technologies often face difficulty in asymmetrical variable-frequency pulse-width-modulated (WPT) systems. To deal with these multiple harmonics as inherently generated by variable frequency amplitude pulse width modulation (VFAPWM), a multiple harmonics analysis technique has been adopted in this work. Different parameters like loads and duty cycle have been varied with varying frequencies, to study the charging current harmonic distortion and voltage harmonic distortions. The difference in voltage observed was essentially nonexistent, with a 1.8 to 3 times variation in switching frequency. Moreover, the pattern of deviation has been noticed for output voltage when the load was varied from 20% to 100%. Additionally, a comparative study has also been performed in evaluating the charging current distortion pattern by the implementation of both MHA techniques and conventional first harmonic approximation (FMA).