Tran Quang Tho, Truong Viet Anh, and Le Minh Phuong. “PWM Technique With Variable Carrier Wave Frequency to Reduce Switching Loss in Grid- Connected Pv Inverter”. Journal of Technical Education Science 9, no. 3 (September 29, 2014): 31–38. Accessed April 7, 2026. https://www.jte.edu.vn/index.php/jte/article/view/552.