A Novel Optimization Method of Compensation Network Parameters for LCC Topology Wireless Power Transfer System With Anti-Offset Characteristics

For the coil misalignment problem in the charging process of automatic guidance vehicles (AGVs), this paper proposes an optimization method for the bilateral LCC compensation network parameters based on quadruple-D quadrature (4DQ) coils. By introducing two coefficients
$K_{\text {T}}$
and
$K_{\text {f1}}$
, the compensation capacitors
$C_{\text {T}}$
and
$C_{\text {f1}}$
are optimized, achieving smaller output power fluctuations. Firstly, the capacitor values
$C_{\text {T}}$
and
$C_{\text {f1}}$
at resonance in the SS and PS equivalent circuit topology are obtained, meanwhile, the relationship between the output power
$P_{\text {out}}$
and the coupling coefficient
$k$
, represented by the coefficients
$K_{\text {T}}$
and
$K_{\text {f1}}$
, is obtained. Furthermore, with the transmission efficiency as the limiting condition, the output power fluctuation is effectively suppressed by adjusting
$K_{\text {T}}$
and
$K_{\text {f1}}$
. Finally, the experimental results show that after optimization the output power is 427.08W, and the transmission efficiency is 93.506% when the coupling coil are aligned, the system can still maintain a power output of at least 382.36W with a coil offset of 0-153mm in the X/Y axis directions, and the transmission efficiency is always above 89.472%. At the same time, the maximum deviation value
$\Delta P_{{\text {abs}\_{}\text{max}}}$
decreased from 213.1W before optimization to 111.0W after optimization, a decrease of 47.91%, effectively suppressing the power fluctuation and improving anti-offset performance.