Coupling coefficient observer based on Kalman filter for dynamic wireless charging systems

<span lang="EN-US">In the dynamic wireless charging system for electric vehicles, transfer efficiency reaches maximum value when load impedance is equal to optimal value. However, depends on coupling coefficient, which varies with vehicle's position. Therefore, track as well improve efficiency, it necessary know coefficient. This paper proposes a coefficient observer method based Kalman filter.<a name="_Hlk112085491"></a> Then, secondary side, an controller acts active rectifier efficiency. <a name="_Hlk112099041"></a>The results show that estimation achieves high accuracy. The estimated error of mutual inductance less than 5% in both case impact measurement noise and change parameters. System improved by 3.2% compared conventional method.</span>