Abstract: Due to the difficulty in analytically describing the port characteristics of power electronic transformers (PETs), generating the Jacobian matrix for power flow calculations in hybrid AC/DC distribution networks with multiple PETs and distributed generations is challenging. A power flow calculation method based on an alternate iteration method is proposed to address this. Firstly, an equivalent controlled source pair is constructed to decouple the mutual influence between multiple PET ports, creating a suitable decoupling model. Secondly, control modes are divided to reflect the impact of different port control modes, resulting in different equations for PETs. Subsequently, power flow equations for networks with PET in various operational scenarios are derived, considering port control modes and coordinated control methods. Finally, using port voltage and power as decoupled variables, an alternate iterative algorithm is used for power flow calculations in hybrid AC/DC networks. The method's accuracy is validated by comparing results with detailed model-based simulations using the improved IEEE33 test system of AC/DC hybrid distribution.