Pham LN, Phan QD, Nguyen VN. Four-Level Neutral Point Clamped Inverter Fed by 18-Pulse Diode Rectifier With Low Input and Output Harmonic Distortion: VERSION OF RECORD ONLINE: 17/09/2025. JTE [Internet]. 2025 Sep. 17 [cited 2026 Apr. 7];. Available from: https://www.jte.edu.vn/index.php/jte/article/view/1773