I am trying to perform a stability study for VSC connected to an equivalent grid on SIMULINK. I need to extract the load angle from the implemented control of VSC(droop) and subtract it with the angle from phasor of grid voltage. The idea is to plot the (P-delta) curves and examine how the operating point changes during transients. The load angle extracted from the control is linearly increasing with time, and doesnt show any changes when a voltage sag is introduced. I have attached the screenshots, any leads on what is wrong? The plot is for deltatheta

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