Mathematical Problems in Engineering / 2021 / Article / Tab 3 / Research Article
Online Monitoring and Early Warning of Subsynchronous Oscillation Using Levenberg–Marquardt and Backpropagation Algorithm Combined with Sensitivity Analysis and Principal Component Analysis Table 3 PCA method for processing input parameters.
Sample number 1 2 3 4 5 6 7 8 9 Original input parameters P th /Q th 1.0/0.2 0.5/0.2 1.0/0.2 1.0/0.2 1.0/0.2 1.0/0.2 1.0/0.2 1.0/0.2 1.0/0.2 P DFIG /Q DFIG 1.0/0.1 1.0/0.1 0.5/0.1 1.0/0.1 1.0/0.1 1.0/0.1 1.0/0.1 1.0/0.1 1.0/0.1 P HVDC /Q HVDC −1.0/0.2 −1.0/0.2 −1.0/0.2 −0.7/0.2 −1.0/0.2 −1.0/0.2 −1.0/0.2 −1.0/0.2 −1.0/0.2 K C 1 1 1 1 3 1 1 1 1 K I_DFIG 0.16 0.16 0.16 0.16 0.16 0.7 0.16 0.16 0.16 K P_DFIG 0.3 0.3 0.3 0.3 0.3 0.3 0.7 0.3 0.3 K I_HVDC 20 20 20 20 20 20 20 100 20 K P_HVDC 6500 6500 6500 6500 6500 6500 6500 6500 3250 Parameters after PCA dimensionality reduction Z 1−1.40 −0.38 1.56 0.49 −1.06 −1.41 3.68 0.25 −1.73 Z 20.90 −0.32 3.66 −0.78 −0.98 −0.88 −1.43 −0.76 0.58 Z 32.07 0.10 −1.12 −0.47 −1.35 −1.23 1.15 −0.51 1.36 Z 4−0.11 −0.01 0.03 0.02 −2.24 2.25 0.12 0.02 −0.08 Z 5−0.30 0.74 −0.15 1.06 −0.87 −0.85 −0.74 1.07 0.04 Z 6−0.35 0.12 0.01 −0.20 −0.02 −0.02 0.06 0.02 0.37