NPC 인버터에서 Carrier-based PWM 방법의 분석과 비교

This paper provides analysis and comparison of carrier-based PWM methods for neutral-point-clamped (NPC) inverter. The harmonics current of NPC inverter are compared with those of conventional 2-level inverter by the analysis of harmonic voltage vector, and the current harmonics for various modulator are compared with one another. In addition, we investigate the variation of neutral point current for each PWM method according to the modulation index (m,) and power factor (PF), Finally, with the simulation results, this paper determines the optimal PWM method according to the modulation index and PF among the considering methods.