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Figure 1. 

The schematic diagram of an offshore floating platform system with energy harvesting and WPT capabilities.

Figure 2. 

WPT System topology with Buck converter and time-varying mutual inductance.

Figure 3. 

The prototype for experimental validation (with the coil lateral misalignment).

Figure 4. 

Implementation of coil lateral misalignment (left) and angular variation (right).

Figure 5. 

Schematic of the lateral misalignment (left) and angular variation (right).

Figure 6. 

The PRBS injection and data sampling procedure.

Figure 7. 

The sampled dataset D_S (1^st and 2^nd subplots), and the FIT value of the model G(z⁻¹, k) (3^rd subplot).

Figure 8. 

Experimental results under lateral coil misalignment. (a) Constant voltage output 100 V under motion frequency 0.7 Hz; (b) constant voltage output 100 V under motion frequency 0.4 Hz; (c) the step response results when V_out changed from 100 to 70 V; (d) the step response results when V_out changed from 70 to 100 V; (e) constant voltage output 100 V when DC source voltage V_dc changed from 150 to 170 V; (f) constant voltage output 100 V when DC source voltage V_dc changed from 170 to 150 V.

Figure 9. 

Experimental results under angular variation of coil. (a) Constant voltage output 100 V under motion frequency 0.6 Hz; (b) constant voltage output 100 V under motion frequency 0.4 Hz; (c) the step response results when V_out changed from 100 to 70 V; (d) the step response results when V_out changed from 70 to 100 V; (e) constant voltage output 100 V when DC source voltage V_dc changed from 150 to 170 V; (f) constant voltage output 100 V when DC source voltage V_dc changed from 170 to 150 V;