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).
Keywords: EV, Multiple harmonic analyses, WiTricity.
