Title :
Study on neutral-point voltage balance of 3-level NPC inverter in 3-phase 4-wire system
Author :
Zhang, Wenping ; Li, Xiao ; Du, Chengrui ; Wu, Xiaotian ; Shen, Guoqiao ; Xu, Dehong
Author_Institution :
Dept. of Electr. Eng., Zhejiang Univ., Hangzhou, China
Abstract :
Problem of neutral-point voltage unbalance is a key issue for 3-phase 4-wire 3-level NPC inverter. This paper analyzes the relationship between the neutral point voltage and the neutral point current. Neutral-point voltage problem is transformed into neutral-point current problem. Then value of neutral-point current under balanced and unbalanced load condition is calculated. According to the mathematical analysis, a neutral point voltage control strategy is investigated. The simulation and experimental results verify control method.
Keywords :
Capacitors; Converters; Fluctuations; Inverters; Mathematical model; Modulation; Voltage control; 3-level; 3-phase 4-wire; neutral-point voltage;
Conference_Titel :
Power Electronics for Distributed Generation Systems (PEDG), 2010 2nd IEEE International Symposium on
Conference_Location :
Hefei, China
Print_ISBN :
978-1-4244-5669-7
DOI :
10.1109/PEDG.2010.5545910
