From: Reduced order modeling for transient simulation of power systems using trajectory piece-wise linear approximation
Training trajectory
\(\varvec{\delta }_{\varvec{2}}\)
\(\varvec{\delta }_\mathbf{i } \quad \varvec{\forall } \mathbf i \varvec{\ne } \mathbf 2 \)
Trajectory 1
1.45
1.25
Trajectory 2
1.1
1
Trajectory 3
0.8