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Table 4 Heavy active and reactive power at some load buses of the IEEE 30-bus test system

From: A novel collapse prediction index for voltage stability analysis and contingency ranking in power systems

Bus no.

Apparent power P(MW)

Q(MVAr)

Most critical lines

Lines (from–to)

NCPI

Lmn

FVSI

LQP

NLSI

VSLI

Bus-3

P = 290

Q = 265

3–1

3–1

0.9481

0.6522

0.3578

0.2836

0.6487

0.9494

 

3–4

0.6205

0.6095

0.6019

0.5159

0.6214

0.6218

Bus-7

P = 381

Q = 200

7–5

7–5

0.9795

0.9580

0.8389

0.5348

0.9624

0.9853

 

7–6

0.7386

0.5016

0.2872

0.3148

0.6553

0.8738

Bus-12

P = 212

Q = 174

12–4

12–4

0.9743

0.2363

0.1459

0.9641

0.1459

0.9361

 

12–13

0.8993

0.8993

0.8993

0.8993

0.8993

0.8993

 

12–16

0.0286

0.0662

0.0577

0.1126

0.2750

0.3272

 

12–15

0.0275

0.0095

0.0089

0.0195

0.1028

0.1149

 

12–14

0.0681

0.0684

0.0672

0.0551

0.0317

0.0304

Bus-14

P = 89

Q = 64.6

14–15

14–15

0.9903

0.7340

0.5822

0.1143

0.8653

0.8817

 

14–12

0.9143

0.8922

0.7541

0.4067

0.9251

0.9566

Bus-24

P = 86

Q = 77.3

24–22

24–22

0.9540

0.7852

0.6789

0.3275

0.8558

0.9047

 

24–23

0.7137

0.6762

0.6102

0.3925

0.7464

0.7658

 

24–25

0.6323

0.5839

0.5218

0.3040

0.6796

0.6986

Bus-30

P = 27

Q = 25.9

30–27

30–27

0.9828

0.8982

0.7633

0.3899

0.9324

0.9577

 

30–29

0.6980

0.6598

0.6060

0.3901

0.7242

0.7367