In these figures, the subscript “SS” (e.g., P_SS and Vac_SS) refers to
the results from the small-signal model and subscript “EMT” (e.g., P_EMT and Vac_EMT) refers to results from the detailed EMT simulation. Fig. 5 shows a comparison of the power responses obtained from the detailed nonlinear model and the
small-signal model for a power order step change from 1.0 to 0.95 p.u. The simulations are for SCR=1.6 and the low PLL gain of Kp=10 (i.e., Kppll=10 and 50). Fig.