The AC/DC hybrid power distribution system is an important form of future power distribution systems. The dynamic interaction between the AC and DC systems restricts its stable operation. This paper examines the impact of power electronic device interactions on the stability of AC and DC power distribution systems. By constructing a model of the AC/DC hybrid power distribution system with photovoltaic grid connection

the interactions between the photovoltaic grid connection on the AC and DC sides and their influence on system stability are analyzed. Firstly

a small-signal model of the AC/DC hybrid system with AC and DC photovoltaic grid connection was established. Then

the mechanism of the dynamic interaction between the AC and DC sides of the photovoltaic grid connection was qualitatively analyzed. Considering the different power flow directions

the amplitude-frequency characteristics of the mutual influence components and the trajectory of the dominant mode change in the system under different system parameters were studied to analyze the interaction's influence on system stability. The results show that the transmission of the interaction between the AC and DC sides is affected by parameters such as the control of the interconnection converter

and that changes in power flow direction alter its transmission characteristics. Finally

the correctness of the analysis results was verified through simulation analysis.