基于三端口高频隔离变换器及其控制策略的混合式先进牵引供电装置

The advanced traction power supply equipment (ATPSE) based on power electronics technology presents an opportunity to address issues of negative-sequence power quality and neutral section simultaneously. However, existing power-frequency/high-frequency isolation schemes still face challenges such as low power density and high investment costs. To address these issues, a high-frequency isolated ATPSE (HI-ATPSE) based on triple-port high-frequency isolated dc converter and existing traction transformers is proposed. Compared to existing high-frequency isolation schemes, the device volume and initial cost are effectively reduced by sharing output ports in the proposed HI-ATPSE. In addition, considering the power quality issues within the proposed HI-ATPSE, a control strategy is proposed to suppress the dc side double-frequency ripple and negative-sequence while reducing the dc side's capacitance value. Finally, the feasibility and reliability of the proposed HI-ATPSE and control strategy are validated through simulation and experimental verification.