1.NARI Technology Co., Ltd., Nanjing 211106, China;2.School of Electrical Engineering, Southeast University, Nanjing 210096, China

With the increase of renewable energy penetration, it is of great significance for the system frequency stability analysis to study the dynamic characteristics of the frequency of the system with the integration of renewable energy by the self-synchronous voltage source. Based on this, by using the load capacity as the reference capacity, this paper constructs a system frequency dynamic aggregation model including the synchronous generator and the integration of renewable energy by the grid-following current source and the grid-forming self-synchronous voltage source. And the influence of the proportion of renewable energy by the self-synchronous voltage source and the control parameters of the self-synchronous voltage source on the dynamic and steady-state performance of the system frequency is analyzed by using the damping ratio and the H_∞ norm index. The research results show that there is a critical range of the influence of the proportion of self-synchronous voltage source on the system frequency performance, and the effect of proportion increase on the frequency performance is obviously reduced when the proportion of self-synchronous voltage source exceeds the critical range. Finally, the effectiveness of the proposed system frequency dynamic aggregation model and the correctness of the analysis results are verified by the real-time simulation based on RT-LAB.