With the continuous improvement of new energy permeability

loop switching in distribution network is becoming a hot topic of study

and phase shifting transformer (PST) is widely concerned as an important means of power flow regulation. In the existing modeling and calculation methods to PST

the effect of the equivalent impedance on the phase shift effect is often ignored

which

in some cases

leads to the deviation between the analysis results and the actual situation and affects safe and stable operation of system. On this basis

in this paper a dual-core symmetrical phase-shifting transformer model considering the influence of equivalent impedance is set up by way of considering the diversity of functions and the variability of structure of phase-shifting transformer together with the voltage drop generated by equivalent impedance. The corresponding power flow calculation model is derived

which makes the theoretical analysis results more accurate. Finally

a simulation system model is set up in PSDEdit. The results show that whether the equivalent impedance is considered in the mathematical model of PST has a great influence on the calculation results of the active power transmitted by the line in the steady-state environment and the impact degree of the system in the transient process. Consideration of the effect of the equivalent impedance is more conducive to improve the accuracy of the analysis results.