Voltage Stability Bifurcation Analysis for AC/DC Systems with VSC-HVDC

Table 4

Performance comparison of the modified IEEE-118 test system for four different operating modes.

The two cases	Operation modes	Load margin 𝜆 (p.u.)	Iteration numbers	CPU time in seconds
AC/DC system	1	4.6188	15	29.7642
AC/DC system	2	4.8750	15	32.0300
AC/DC system	3	4.8625	15	31.2754
AC/DC system	4	6.2750	15	76.4324