## 6 Experimental Results  
The key specifications of a 1 kW three-phase single-stage AC-DC converter, equipped with a power factor correction (PFC) stage and a contactless coupler integrated with a series-series (S-S) compensation circuit, are outlined in Table 2. To emulate the wind-speed-dependent generator voltage and frequency of a small wind turbine, a 1 kW wind turbine test setup was utilized. This setup included a drive inverter, a drive motor, a 1/4 reduction gearbox, and a Permanent Magnet Synchronous Generator (PMSG). Table 3 shows the line-to-line voltage (V\({}_{\rm LL}\)) of the wind turbine as a function of the RPM. Based on these parameters, a prototype of the 1 kW system was fabricated and tested. In the experimental results, as shown in Figure 12, the operation characteristics of the proposed circuit were compared and analyzed using a dsPIC33 FJ16 GS502 16-bit DSP control board. This experiment was conducted at a fixed switching frequency (f\({}_{\rm S}\): 85 kHz), implementing phase control (D\({}_{1}\)T) for the IPT-based three-phase single-stage AC-DC converter. The comparison included controlling the secondary-side output voltage (V\({}_{\rm o}\)) via wireless communication versus controlling only the primary-side link voltage (V\({}_{\rm Link}\)) without wireless communication. As shown in Figure 13, a three-phase 1 kW wind turbine simulation setup, used as a three-phase alternating current source, an electronic load (Chroma 63206 A, 6 kW, CR Mode (1066 \(\Omega\)-160 \(\Omega\))), and a power meter (HIOKI, PW3390) were prepared for experimental study. This setup was used to verify the operational characteristics of the proposed three-phase single-stage AC-DC converter for small wind turbine systems. \begin{table}
\begin{tabular}{c c} \hline Core size (R/r/H) & 100 mm/5 mm/4 mm \\ Aluminum shield size (R’/H’) & 140 mm/4 mm \\ Transformer ratio (N\({}_{1}\)/N\({}_{2}\)) & N(N\({}_{1}\)/N\({}_{2}\)) = 0.684 (13/19) \\ Conditions of air gap & 10 mm \\ Pri./Sec. self-infductance (L\({}_{1}\)/L\({}_{2}\)) & 87.44 \(\mu\)H/166.3 \(\mu\)H \\ Magnetizing inductance (L\({}_{m}\)) & 66.76 \(\mu\)H \\ Pri./Sec. leakage inductance (L\({}_{11}\)/L\({}_{2}\)) & 20.68 \(\mu\)H/23.7 \(\mu\)H \\ Coupling coefficient (k) & 0.809 \\ Resonant frequency (f\({}_{\rm r}\)) & 80 kHz \\ Pri./Sec. resonant capacitor (C\({}_{r1}\)/C\({}_{r2}\)) & 203 nF/173 nF \\ \hline \end{tabular}
\end{table} 
Table 1: Parameters of the IPT-based loosely coupled transformer. \begin{table}
\begin{tabular}{c c} \hline \hline
**Specification/Parameters** & **Values** \\ \hline Wind power generator voltage & 112-250 V\({}_{\mathrm{rms}}\)/20–47 Hz \\ (V\({}_{\mathrm{LL}}\))/frequency (f\({}_{\mathrm{G}}\)) & 400 V\({}_{\mathrm{DC}}\)/1 kW \\ Output voltage (V\({}_{\mathrm{o}}\))/Power (P\({}_{\mathrm{o}}\)) & 85 kHz/80 kHz \\ Switching/resonance frequency (f\({}_{\mathrm{s}}\)/f\({}_{\mathrm{r}}\)) & 350 ns \\  Dead time (t\({}_{\mathrm{dead}}\)) & UJ3C0120040 KS [1200 V/65 A/35 m\(\Omega\)] \\  SIC switching devices (Q\({}_{\mathrm{1}}\)–Q\({}_{\mathrm{4}}\)) & UJ3C0120040 KS [1200 V/65 A/35 m\(\Omega\)] \\  Circulating diodes (D\({}_{\mathrm{1}}\), D\({}_{\mathrm{2}}\)) & UJ3D6560 KSD [650 V/60 A/1.5 V\({}_{\mathrm{F}}\)] \\  SIC input rectifier diodes & GP2D050A120B [1200 V/50 A/1.4 V\({}_{\mathrm{F}}\)] \\  Schottky output diodes & UJ3D6560 KSD [650 V/60 A/1.5 V\({}_{\mathrm{F}}\)] \\ C\({}_{\mathrm{1}}\), C\({}_{\mathrm{2}}\)/C\({}_{\mathrm{B}}\), C\({}_{\mathrm{B}1}\), C\({}_{\mathrm{B}2}\) & 1000 μ/3.3 μF \\ \hline \multicolumn{3}{c}{**PFC Inductor and Capacitor Parameters**} \\ \hline L\({}_{\mathrm{Fa}}\), L\({}_{\mathrm{D}}\), L\({}_{\mathrm{F}\mathrm{c}}\) & 10.8 mH [DKIH-3352-1011-NK] \\ L\({}_{\mathrm{B}1}\), L\({}_{\mathrm{B}2}\), L\({}_{\mathrm{B}3}\) & 60 μH \\ C\({}_{\mathrm{Fa}}\), C\({}_{\mathrm{Pb}}\), C\({}_{\mathrm{F}\mathrm{c}}\) & 3.3 μF \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Main input–output specifications and the used devices.