Nonlinear integral backstepping control based on particle swarm optimization for a grid-connected variable wind energy conversion system during voltage dips. - Elmostafa Chetouani; Youssef Errami; Abdellatif Obbadi; Smail Sahnoun; Elhadi Baghaz; Hamid Chojaa; Said Mahfoud (Comput. Electr. Eng., 2024)