Table 4 Assessment information of all methods
Criterion name | Instability detection moment (s) | Parameters | Values |
|---|---|---|---|
Maximum power angle difference based criterion | 1.54 | threshold value of power angle difference () | 180 |
power angle difference detecting instability () | 180.58 | ||
leading generator | Yemazhai#1 | ||
lagging generator | Nayong#1 | ||
maximum power angle difference (°) | 357.91 | ||
maximum power angle difference moment (s) | 2.72 | ||
Clearance of generator cluster based criterion | 2.02 | threshold value of clearance angle difference (°) | 150 |
clearance of generator cluster detecting instability (°) | 156.7528 | ||
Measured trajectory based EEAC | 1.72 | unbalanced power (MW) | 15.8657 |
power angle speed (rad/s) | 3.0980 | ||
Trajectory convexity in the phase plane based criterion | 2.28 | convexity index in the angle-angle acceleration phase | 0.0005 |
convexity index in the unbalanced power-angle phase | 0.3162 | ||
changing rate of electric power | 24.3630 | ||
Single generator energy function based criterion | 1.96 | power angle acceleration (rad/s2) | −0.0041 |
energy changing rate (MW/s) | 282.7081 | ||
Perturbed voltage trajectory integration based criterion | 0.74 | key bus station | Shuanglong |
voltage upper limit (pu) | 0.85 | ||
threshold value of voltage integration | 0.03 | ||
voltage integration value | 0.0304 |