“…Event Detection Category Applied Technique [70], [80], [83], [85], [86], [136] Signal Processing Wavelet Transform [70], [72], [75], [79], [90]- [92], [138], [139] Filtering [81], [89], [140], [141] Fourier Transform [94], [100], [104]- [107], [116], [120], [142] Statistical Analysis PCA [95], [99], [103], [110], [113], [115], [121] Clustering and Correlation [123], [127], [131]- [133] Machine Learning/Deep Learning CNN [125], [128], [134] LSTM Among these requirements, frequency response and active power control are critically important. Figure 6 shows the deterioration of the U.S Eastern Interconnection (EI) frequency response to a 4.5 GW generator loss under different levels of PV penetration [148]*.…”