Simplified PWM Strategy for Neutral-Point-Clamped (NPC) Three-Level Converter
- Resource Type
- Academic Journal
- Authors
- Zongbin Ye; Yiming Xu; Fei Li; Xianming Deng; Yuanzheng Zhang
- Source
- JOURNAL OF POWER ELECTRONICS. 2014-05 14(3):519-530
- Subject
- Minimum pulse width compensation
Neutral point potential balance
PWM
Switching losses reduction
Three-level converter
- Language
- Korean
- ISSN
- 1598-2092
2093-4718
A novel simplified pulse width modulation(PWM) strategy for neutral point clamped (NPC) three-level converter is proposed in this paper.The direct output voltage modulation is applied to reduce the calculation time. Based on this strategy, several optimized control methods are proposed. The neutral point potential balancing algorithm is discussed and a fine neutral point potential balancing scheme is introduced. Moreover, the minimum pulse width compensation and switching losses reduction can be easily achieved using this modulation strategy. This strategy also gains good results even with the unequal DC link capacitor. The modulation principle is studied in detail and the validity of this simplified PWM strategy is experimentally verified in this paper. The experiment results indicated that the proposed PWM strategy has excellent performance, and the neutral point potential can be balanced well with unequal DC link captaincies.