Performance improvement of cascaded H-bridge multilevel inverters with modified modulation scheme

• Published in: JOURNAL OF POWER ELECTRONICS Vol. 21; no. 3; pp. 541 - 552
• Main Authors: Lee, Eui-Jae, Lee, Kyo-Beum
• Format: Journal Article
• Language: English
• Published: Singapore Springer Singapore 01.03.2021; 전력전자학회
• Subjects: Electrical Machines and Networks; Engineering; Original Article; Power Electronics; 전기공학; Total harmonic distortion improvement; Cascaded H-bridge multilevel inverter; Phase-shifted PWM; Discontinuous PWM; Switching loss reduction
• ISSN: 1598-2092; 2093-4718
• DOI: 10.1007/s43236-020-00200-w

This study proposes a modified modulation scheme based on the phase-shifted pulse-width modulation (PS-PWM) method to improve the output performance and reduce the switching loss in cascaded H-bridge multilevel inverters. The PS-PWM method is one of the most popular modulation schemes. However, it generates significant switching loss, which can lead to the failure of power semiconductor switches. Various studies have proposed modulation schemes to reduce switching loss. The clamped discontinuous PWM (DPWM) method achieves the best switching loss reduction performance in comparison with other modulation schemes. However, the clamped DPWM method has low output characteristics, such as total harmonic distortion. The proposed modulation scheme achieves the same switching loss reduction and improved output performance by modifying the dwell time order. The proposed evenly clamped DPWM method was compared with the conventional clamped DPWM method through simulations and experiments.