Abstract: Aiming at the power quality problems brought by the access of large-scale distributed power (DG) to the distribution network, this paper proposes distribution network power flow optimization control method based on hybrid power electronic transformer (HPET), which aims to improve the accommodation capacity of the distribution network for DG. The steady-state of HPET are described by establishing a voltage source model and a power injection model, and the HPET sequential linear programming (SLP) method is proposed by considering the nonlinear voltage capability and the constraints of power electronic devices. Through example simulation verification, the proposed method provides a low-cost and efficient voltage/reactive power control solution for the distribution network high-penetration DG access by coordinating the operation of multiple HPET, which improves the utilization of DG in the distribution network.