## 1 Introduction  
Small-scale wind power systems ranging from 1 kW to 3 kW are being increasingly applied to grid-connected wind power systems for self-generation in urban and rural communities. Given their installation near residential areas, efficiency, reliability, and electrical stability are particularly important [1; 2; 3]. Existing small-scale wind power generation systems (WFGSs) are being upgraded to improve efficiency by boosting the generation voltage of Permanent Magnet Synchronous Generators (PMSGs) from 80 V\({}_{\text{rms}}\) to 250 V\({}_{\text{rms}}\). These systems incorporate a three-phase power factor correction (PFC) AC-DC converter and a non-isolated DC-DC converter to enhance the input power factor and overall performance [4; 5; 6]. By applying a PFC AC-DC converter at the output of the PMSG, the three-phase AC generation voltage and current can be made in phase, thereby improving the power factor (PF) and achieving a nearly sinusoidal AC current waveform. However, the use of a non-isolated DC-DC converter necessitates the use of a low-frequency transformer (50 Hz or 60 Hz) at the output of the grid-connected inverter, which limits the compactness of small-scale wind power systems. To achieve compactness, high-frequency transformers (HFTR) are used in the DC-DC converter stage, providing isolation and a wide output voltage range. Nevertheless, the power conversion devices of small-scale WFGSs are complex due to the two-stageconfiguration of PFC and DC-DC converters, leading to increased circuit complexity and control challenges [7; 8; 9]. To address these issues, recent research has focused on developing small-scale WPGSs that utilize a single-stage AC-DC converter, which can improve the power factor (PF) and provide isolated output within a single power conversion unit. This approach allows for a more compact and lightweight design, reducing the weight burden on the nacelle, and can also be expanded for grid-connected applications [10; 11]. However, in practical applications, the three-phase wind turbine generators can rotate with the nacelle due to wind speed or direction changes. This makes it challenging to ensure electrical stability when connecting the generator voltage to the power conversion device located in a fixed tower as it can lead to issues such as cable twisting. Slip rings and brushes, as shown in Figure 1a, are used to address this issue. However, when power is transmitted through the brushes during nacelle rotation, issues such as sparks and contact wear arise, leading to reduced reliability of the wind power system [12]. Therefore, to reduce disadvantages such as brush wear and decreased reliability caused by nacelle rotation in three-phase medium and small-scale wind turbines, recent research has focused on wireless power transfer (WPT) systems for Inductive Power Transfer (IPT)-based small-scale wind power generation systems (WPGSs) [13]. The basic structure of the IPT-based small-scale WPGS is illustrated in Figure 1b. The primary contactless coupler is fixed to the shaft below the main bearing unit of the nacelle tower, allowing it to rotate with the nacelle according to wind direction. The secondary coupler, which maintains a fixed air gap with the primary side, is secured inside the tower. The fixed secondary coupler is connected to a high-frequency diode rectifier and a high-voltage DC link, which can be connected to a grid-tied inverter. Additionally, for IPT-based wireless power transfer, compensation circuits such as S-S (series-series) and S-P (series-parallel) circuits are commonly used [14; 15]. These main circuit topologies for wireless power transfer are being studied for application in small-scale wind power systems. Although single-stage converter modules for IPT-based three-phase small wind power systems have been reviewed, they are complex because they implement three-phase circuits based on single-phase designs, making the main circuit configuration complicated.