Abstract: Compared with the single-source grid-connected system,the broadband oscillation analysis of the multi-source gridconnected system,represented by the wind-PV system,becomes more complicated due to the interaction between the stations. In this paper,a small signal model of the system is established by using the graphical modeling method and verified by simulation. Then,the broadband oscillation mode is analyzed by the eigenvalue analysis method to find out the interaction mode of wind farm and photovoltaic power station. Impedance method is used to study the interaction between renewable energy stations and analyze the influencing factors.The research results show that the interaction between renewable energy stations depends on the relative size and phase of the equivalent admittance of the stations,and the grid-connected distance and output ratio of renewable energy stations will affect the interaction between the stations and thus affect the system interaction mode. The analysis of the interaction rule of different positions and operating conditions of renewable energy can provide certain guidance for the access and operation of large-scale renewable energy.