VSG low voltage ride through control strategy based on power angle maintenance
Virtual synchronous generator(VSG)control simulates the operation characteristics of the synchro-nous generator to achieve the purpose of providing inertia support for the power grid by grid-connected invert-er.The traditional VSG is easy to cause the over-amplitude of the output current and the power angle oscilla-tion when a short-circuit fault occurs in the power grid,and it cannot provide reactive power support for the power grid,so that the inverter does not have the ability of low voltage ride through(LVRT).Aiming at this problem,this paper puts forward a kind of LVRT strategy based on VSG control.The power angle keeps stable during the fault,the pre-synchronization is implemented through a link of power angle maintenance based on virtual power during the fault recovery,and after the fault is recovered,the output power can be quickly restored to the given value to realize the smooth and quick switching between operating modes,thus achieving the LVRT.Simulation results show that the control strategy is correct and effective.
virtual synchronous generator(VSG)low voltage ride through(LVRT)power angle ma-intenancedynamic response
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