Four-Leg-Based Fault-Tolerant Matrix Converter Schemes Based on Switching Function and Space Vector Methods

• Published in: IEEE transactions on industrial electronics (1982) Vol. 59; no. 1; pp. 235 - 243
• Main Author: Kwak, Sangshin
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.01.2012; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Circuit faults; Fault tolerance; Fault tolerant systems; Fault-tolerant drive; Mathematical analysis; matrix converter; Matrix converters; Modulation; Phase modulation; space vector modulation; Switches; Switching; switching function; Topology; Vectors (mathematics)
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2011.2143378

A four-leg-based fault-tolerant matrix converter topology is proposed, along with switching function and space vector approaches for modulation schemes, to improve the reliability of matrix converter drives. The four-leg-based fault-tolerant structure utilizes an additional redundant phase module. Based on the reconfigured hardware topology, fault-tolerant modulation strategies with both switching function and space vector approaches are developed to provide the matrix converter drives with continuous and disturbance-free operation. Pulsewidth-modulated algorithms with closed-form expressions, based on a switching function matrix, are presented to synthesize redefined output waveforms with reconfigured converter structures. Furthermore, a space-vector-based scheme using the indirect equivalent circuit with the fictitious dc link is also developed for the fault-tolerant topology after failures. Experimental results show the feasibility of the proposed four-leg-based fault-remedial approach, along with the developed modulation techniques.