Neutral-point potential balancing problem of five-level active neutral-point-clamped inverter

作者：Wang Kui^*; Zheng Zedong; Li Yongdong

来源：Proceedings of the CSEE, 2012, 32(3): 30-35.

• Active neutral-point-clamped (ANPC)
• Balancing algorithms
• Balancing problems
• Diode-clamped
• Emerging topologies
• Fundamental period
• Multilevel converter
• Neutral point potential
• Neutral-point voltages
• Neutral-point-clamped inverters
• Steady state
• Zero sequence voltage

Five-level active neutral-point-clamped (ANPC) converter is a newly emerging topology which can overcome the drawbacks of traditional diode-clamped converters and flying-capacitor converters. The neutral-point potential balancing problem of a five-level ANPC inverter was studied. By calculating the average neutral-point current in a fundamental period, it can be concluded that the neutral-point potential can be balanced by itself under ideal condition and steady state. A neutral-point potential balancing algorithm based on zero-sequence voltage injection was presented. By calculating the neutral-point currents of all key zero-sequence voltages, the most appropriate zero-sequence voltage was selected to generate the required neutral-point current, which can make the neutral-point voltage ripple the lowest. Experimental results were presented to verify the validity of the algorithm.

• 出版日期2012
• 单位清华大学