This paper proposes a grid synchronization control strategy for the grid-connected voltage source converters(VSCs)based on the voltage dynamics of the dc-link capacitor in the *** voltage dynamics of the dc-link capac...
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This paper proposes a grid synchronization control strategy for the grid-connected voltage source converters(VSCs)based on the voltage dynamics of the dc-link capacitor in the *** voltage dynamics of the dc-link capacitor are used to regulate the frequency and phase angle of the inner potential of the VSC,synchronizing the VSC with ***,in the proposed strategy,the active power regulation and grid synchronization of the VSC are combined,which are separated in the traditional control *** can avoid the instability of the VSC in a weak grid with a low short circuit ratio(SCR),aroused by the dynamic interaction between the separated control loops in traditional control ***,the energy stored in the dc-link capacitor is directly coupled with the grid via the inner potential of the VSC,and the inertia characteristic is naturally featured in the inner potential by the proposed *** the increase of the capacitance,the natural inertial response of the VSC is helpful to improve the grid frequency ***,simulation results are presented to validate the correctness and effectiveness of the proposed strategy in the enhancement of the grid frequency and voltage dynamic support capability.
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