1. State Grid Jibei Electric Power Co. Ltd., Beijing 100054, China; 2. State Grid Jibei Electric Power Research Institute(North China Electric Power Research Institute Co. Ltd.), Beijing 100045, China; 3. Grid-connected Operation Technology for Wind-Solar-Storage Hybrid System State Grid Corporation Key Laboratory, Beijing 100045, China

Virtual synchronous generator(VSG)technology is widely concerned because it can help renewable power generation equipment equipped with frequency and voltage support capabilities similar to synchronous machines. The models and control strategies of VSG are now focused on and VSG is mainly applied in the microgrid. Started with the difficulties encountered in the demonstration project of the large-capacity grid-connected renewable VSG, combined with the relevant technical problems of renewable energy development, the safe and efficient operation problems of the grid-connected VSG in the complex conditions are summarized as the grid-connected adaptability of VSG, including grid-connected stability, fault ride-through, and frequency support based on rotor inertia of wind power VSG. For various aspects of grid-connected adaptability problems, the existing research results and limitations are summarized, relevant research progress is specially introduced, and the future research directions are prospected.