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Under large disturbances, P-f droop-controlled voltage source converters may lose synchronous stability, just like synchronous generator. Moreover, the current limitation leads to a more complicated instability mechanism and decreases stability margin greatly. This letter describes a virtual power angle instability problem and analyzes its mechanism from the virtual power angle characteristic curves of a converter with respect to an infinite bus. Simulation verifies the rationality of the analysis.
Xin et al. (2016) studied this question.