Fault-Tolerant Control Strategy for Neutral-Point-Clamped Three-Level Inverter

Autor: Yanxia Shen, Beibei Miao, Dinghui Wu, Kader Ali Ibrahim
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: Journal of Control Science and Engineering, Vol 2018 (2018)
Druh dokumentu: article
ISSN: 1687-5249
1687-5257
DOI: 10.1155/2018/5126404
Popis: A fault-tolerant control technique is discussed for the Neutral-Point-Clamped (NPC) three-level inverter, which ensures that the NPC inverter operates normally even under device failures. A two-level leg is added to the NPC inverter; when the device open circuit fault occurs, the load of this faulty phase is connected to the neutral point of this two-level leg through the bidirectional thyristors. An improved Space Vector Pulse Width Modulation (SVPWM) strategy called “addition and subtraction substitution SVPWM” is proposed to effectively suppress fluctuation in capacitor neutral-point voltages by readjusting the sequence and action time of voltage vectors. The fault-tolerant topology in this paper has the advantages of fewer switching devices and lower circuit costs. Experimental results show that the proposed fault-tolerant system can operate in balance of capacitor neutral-point voltages at full output power and the reliability of the inverter is greatly enhanced.
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