The converter based on virtual synchronous generator（VSG） control can simulate the inertia of synchronous generator.Virtual inertia can be adjusted within a certain range

which is a significant advantage compared with traditional synchronous generator.However

the changes of the control parameters of the flexible virtual synchronous generator（FVSG） will seriously affect the frequency stability of the system.It is very important for parameter selection to explore the influence of the main control parameters on the frequency stability of the system.Firstly

the VSG control strategy with fixed inertial time constant is shown and the control frame of VSG is constructed.Then

three typical FVSG control methods are studied and compared.Finally

in accordance with the FVSG control technology based on exponential inertia

the influence law of the main control parameters on the frequency stability of the system is revealed by constructing the small-signal model

the sensitivity calculation

and the root locus analysis

which provides the basis for the selection of the control parameters.