The problems of variable power flow

power flow reversal and voltage over-limit in new power system are becoming more and more prominent. Hybrid power transformer can not only transmit power reliably

but also meet the flexible regulation requirements of new power system. In this paper

the equivalent circuit that effectively reflects the working characteristics of each component of the hybrid power transformer is constructed. A mathematical model is derived to characterize the relationship between the regulating converter's output voltage and the controlled bus voltage

as well as the active and reactive power flows in the controlled transmission line. Based on the power injection method

the power flow calculation models of the hybrid power transformer to realize the voltage regulation function and power flow regulation function are derived and constructed respectively. The power flow calculation method of hybrid power transformer with multiple control modes of voltage regulation and power flow regulation is proposed. The user-defined models of multi-control mode of hybrid power transformer are constructed by PSASP software

and the validity of the power flow calculation model of hybrid power transformer and the proposed power flow calculation method is verified.