Mathematical Problems in Engineering / 2021 / Article / Tab 4 / 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 4 Sample assessment results.
Sample number Attenuation factor Frequency (Hz) Predicted results and classification Theoretical value Predictive value Error Theoretical value Predictive value Error Divergence Classification correctness 1 −4.318 −4.308 0.010 43.13 43.064 −0.066 No Correct 2 −3.493 −3.483 0.010 43.27 43.291 0.021 No Correct 3 −2.935 −2.885 0.050 43.29 43.278 −0.012 No Correct 4 −4.224 −4.151 0.073 43.14 43.180 0.040 No Correct 5 1.038 1.127 0.089 38.44 38.430 −0.010 Yes Correct 6 1.152 1.193 0.041 43.30 43.360 0.060 Yes Correct 7 −5.414 −5.448 −0.034 42.88 42.874 −0.006 No Correct 8 −3.566 −3.499 0.067 42.02 42.022 0.002 No Correct 9 −3.865 −3.917 −0.052 42.45 42.431 −0.019 No Correct