Research Article
Application of Firefly Algorithm in Voltage Stability Environment Incorporating Circuit Element Model of SSSC with Variable Susceptance Model of SVC
Table 2
Voltage stability index values of most stressed lines.
(a) For 14-bus system |
| Cases | Line number | Preinsertion of FACTS | Postinsertion of FACTS | FA | SFLA | DE | PSO |
| Case 1 | 14 | 0.1122 | 0.0714 | 0.0818 | 0.0807 | 0.0829 | 20 | 0.0776 | 0.0582 | 0.0537 | 0.0544 | 0.0617 | 1 | 0.0688 | 0.0447 | 0.0511 | 0.0491 | 0.0519 | 17 | 0.0593 | 0.0310 | 0.0388 | 0.0408 | 0.0503 | 9 | 0.0515 | 0.0291 | 0.0346 | 0.0307 | 0.0401 |
| Case 2 | 10 | 0.2580 | 0.1106 | 0.1722 | 0.1651 | 0.1995 | 14 | 0.1815 | 0.0994 | 0.0991 | 0.1012 | 0.1244 | 20 | 0.1494 | 0.0912 | 0.0941 | 0.1109 | 0.1286 | 9 | 0.1393 | 0.0833 | 0.0994 | 0.1081 | 0.1120 | 1 | 0.0799 | 0.0517 | 0.0604 | 0.0597 | 0.0661 |
| Case 3 | 10 | 0.1904 | 0.1014 | 0.0941 | 0.1057 | 0.1129 | 15 | 0.1160 | 0.0809 | 0.0802 | 0.0914 | 0.0956 | 6 | 0.0914 | 0.0529 | 0.0317 | 0.0441 | 0.0582 | 4 | 0.0793 | 0.0447 | 0.0406 | 0.0533 | 0.0551 | 9 | 0.0648 | 0.0361 | 0.0304 | 0.0369 | 0.0408 |
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(b) For 30-bus system |
| Cases | Line number | Preinsertion of FACTS | Postinsertion of FACTS | FA | SFLA | DE | PSO |
| Case 1 | 12 | 0.3691 | 0.3664 | 0.3687 | 0.3700 | 0.3683 | 5 | 0.1284 | 0.0695 | 0.1264 | 0.0987 | 0.1282 | 13 | 0.1226 | 0.0722 | 0.0114 | 0.1169 | 0.1095 | 15 | 0.0749 | 0.0713 | 0.0748 | 0.0752 | 0.0749 | 14 | 0.0678 | 0.0667 | 0.0674 | 0.0676 | 0.0672 |
| Case 2 | 12 | 0.3899 | 0.3861 | 0.3877 | 0.3874 | 0.3881 | 5 | 0.3596 | 0.0884 | 0.3310 | 0.0793 | 0.3312 | 13 | 0.2549 | 0.2115 | 0.2355 | 0.2351 | 0.2390 | 16 | 0.1687 | 0.1241 | 0.1735 | 0.1767 | 0.1610 | 15 | 0.1255 | 0.1167 | 0.1245 | 0.1244 | 0.1249 |
| Case 3 | 12 | 0.3851 | 0.3688 | 0.3864 | 0.3686 | 0.3793 | 13 | 0.1732 | 0.1159 | 0.1766 | 0.1152 | 0.1711 | 16 | 0.0836 | 0.0445 | 0.0855 | 0.0475 | 0.0833 | 1 | 0.0786 | 0.0540 | 0.0810 | 0.0568 | 0.0694 | 15 | 0.0775 | 0.0741 | 0.0776 | 0.0749 | 0.0771 |
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