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http://dx.doi.org/10.6113/JPE.2014.14.5.946

Fault-Tolerant Control of Cascaded H-Bridge Converters Using Double Zero-Sequence Voltage Injection and DC Voltage Optimization  

Ji, Zhendong (School of Electrical Engineering, Southeast University)
Zhao, Jianfeng (School of Electrical Engineering, Southeast University)
Sun, Yichao (School of Electrical Engineering, Southeast University)
Yao, Xiaojun (School of Electrical Engineering, Southeast University)
Zhu, Zean (School of Electrical Engineering, Southeast University)
Publication Information
Journal of Power Electronics / v.14, no.5, 2014 , pp. 946-956 More about this Journal
Abstract
Cascaded H-Bridge (CHB) converters can be directly connected to medium-voltage grids without using transformers and they possess the advantages of large capacity and low harmonics. They are significant tools for providing grid connections in large-capacity renewable energy systems. However, the reliability of a grid-connected CHB converter can be seriously influenced by the number of power switching devices that exist in the structure. This paper proposes a fault-tolerant control strategy based on double zero-sequence voltage injection and DC voltage optimization to improve the reliability of star-connected CHB converters after one or more power units have been bypassed. By injecting double zero-sequence voltages into each phase cluster, the DC voltages of the healthy units can be rapidly balanced after the faulty units are bypassed. In addition, optimizing the DC voltage increases the number of faulty units that can be tolerated and improves the reliability of the converter. Simulations and experimental results are shown for a seven-level three-phase CHB converter to validate the efficiency and feasibility of this strategy.
Keywords
Cascaded H-bridge converter; DC voltage balancing; DC voltage optimization; Fault-tolerant control; Star connection; Zero-sequence voltage;
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Times Cited By KSCI : 2  (Citation Analysis)
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