Comparison Between the Motion Equation of Mechanical Network and the In-ertia Damping of Grid-forming VSG
With the wide application of new energy and power electronic equipment,the new power system is facing many instability challenges.In order to overcome these challenges,the grid-forming(GFM)control technology can be used to replace the synchronous machine through voltage support and active inertia adjustment to ensure the stability of the power system.However,the inertia damping mechanism of the grid-connected converter itself is not clear,and its damping coefficient is often ignored.Starting from the motion equation of mechanical system,this paper first de-duces that the motion equation of mass-spring system and the control equation of networked virtual synchronous ma-chine are essentially second-order differential equations.Then,the consistency of the inertia damping mechanism of the mechanical network and the electrical network is verified by experimental simulation.Finally,the key role of the damping coefficient of the grid-connected VSG in maintaining the stable synchronization state is verified by Matlab/Simulink simulation in the IEEE 39-bus system.
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