Abstract
This work aims to explore and evaluate the nonreversible AC/DC five-level structure from the point of view of its operational safety: high electrical security on internal destruction and continuity in operation. It only has low-voltage monotransistor cells (Si and SiC 600 V max) and is intrinsically tolerant to imperfection control and parasites, therefore naturally secure. The design and lab-test of fault monitoring and fault diagnosis with just one voltage sensor of a single-phase five-level VIENNA rectifier were proposed. This real-time diagnostic method allows for a safe stop or corrective control strategy based on the reconfiguration of the modulation. The reconstruction strategy allows for optimization of the current and voltage signals as well as power factor. A continuous post-fault operation can be achieved for critical applications. An experimental prototype 3 kW/230 VAC/800 VDC/32 kHz was created to validate the proposed fault diagnosis method and reconfiguration control method.
Highlights
The study of switch failures in a VIENNA structure requires in-depth knowledge of the operating principles of this converter under normal conditions
Several open-circuit fault (OCF) diagnostic methods have been proposed based on the radius and form of the current [13,14,15,16]
Instead of using the current, the OCF can be detected by output voltage for multilevel cascade inverters [17]
Summary
The study of switch failures in a VIENNA structure requires in-depth knowledge of the operating principles of this converter under normal conditions. The dynamic model in the form of equations of state can be transcribed by the latter to understand the evolution of the flying voltages of the converter and to find the steady state directly. The study of the behavior of the VIENNA converter following the failure of a power switch analyzes the constraints generated by the fault to check whether the safety of the converter is ensured and whether the degraded operation is possible. The fault types of multilevel converters are classified into two: open-circuit fault (OCF) and short-circuit fault (SCF). Instead of using the current, the OCF can be detected by output voltage for multilevel cascade inverters [17]. Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
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