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Admittance study of grid connected VSCs for harmonic oscillatory instabilities

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Figure

Fig. 1. System model:
Fig. 2. Real part of the positive- and negative-sequence VSC  admittance. Continuous and dashed lines: Analytical  expression (16) (G vsc () and G vsc (), respectively); Dots:
Fig. 5. Influence of the CC bandwidth on the boundary  frequencies f b+  and f b    of the VSC negative damping region
Fig. 6 illustrates the errors between the different  approximations of the frequency f b+  and those obtained from  (17)
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