POWER QUALITY IMPROVEMENT USING UPQC. International Engineering Journal For Research & Development, [S. l.], v. 6, n. ICMRD21, p. 12, 2021. DOI: 10.17605/OSF.IO/984MH. Disponível em: https://www.iejrd.com/index.php/iejrd/article/view/1791. Acesso em: 1 oct. 2026.