Influence analysis of the main control parameters in FVSG on the frequency stability of the system

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 change 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 inertia time constant is shown and the control frame of VSG is constructed. Then, the FVSG control method based on exponential inertia is studied. Finally, the influence law of the main control parameters of FVSG 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.