Abstract: With the increasing penetration of renewable energy generation systems such as wind power and photovoltaics,the power grid presents a weak grid or even very weak grid characteristics,which brings about serious challenges with regard to the stable and efficient operation of renewable energy grid-connected generation systems.By reviewing the current results of existing typical renewable energy grid-connected inverter stability control strategies and other aspects,the basic principles and research status of current-source mode,voltage-source mode,and dual-mode control are summarized,and the current-source mode based on phase-locked loop control can ensure system stability and power control rapidity under a strong grid,which has many limitations in terms of stability,system voltage,and frequency adjustment,and adapting to a scenario where a high proportion of renewable energy generation units are connected is difficult.Voltage-source mode control based on power self-synchronous control can provide support for voltage and frequency,and it is therefore more suitable for weak grid situations with high penetration of renewable energy generation connected to the grid.The dual-mode control strategy based on grid impedance adaptation takes advantage of both the current-source mode and voltage source mode in terms of stability,which is more applicable to the scenario of large fluctuations in grid impedance under a high penetration rate.Finally,the above-mentioned typical control strategies are summarized and discussed to determine possible future research directions.