Analysis and Minimization of the Oscillatory Currents in Multibranch Thyristor-Switched Capacitors

Figure 6

The optimal switching angle 𝛼 as a function of the per unit capacitor initial voltage 𝑧=𝑉_𝑜/𝑉_𝑚, for switching each of the four branches 𝑘=1, 2, 3 and 4. Plots for three different per unit total compensator ratings are shown. In each plot, the top curve corresponds to 𝑘=1, and the bottom curve applies for 𝑘=4.

(a) Compensator rating 𝛾=0.03 per unit

(b) Compensator rating 𝛾=0.104 per unit

(c) Compensator rating 𝛾=0.208 per unit