Fault detection and diagnosis of grid-connected photovoltaic systems using energy valley optimizer based lightweight CNN and wavelet transform oleh Ali Teta, Belkacem Korich, Derradji Bakria, Nadji Hadroug, Abdelaziz Rabehi, Mohammad Alsharef, Mohit Bajaj, Ievgen Zaitsev, Sherif S. M. Ghoneim