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Generalized IGBT Open-Circuit Fault Diagnosis Algorithm with no Additional Sensors for Grid-Connected N-Level NPC Converters

Caseiro, L. ; Mendes, A. M. S.

Generalized IGBT Open-Circuit Fault Diagnosis Algorithm with no Additional Sensors for Grid-Connected N-Level NPC Converters, Proc IEEE Industrial Electronics Conf. - IECON, Yokohama, Japan, Vol. 1, pp. 1 - 6, November, 2015.

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Abstract
This paper presents a real-time diagnostic algorithm
for IGBT open-circuit faults in Neutral-Point-Clamped converters,
generalized for the N-level case. This algorithm can thus be
used in any NPC converter without adaptations, regardless of the
number of levels. The algorithm is based on the estimated instant
pole voltage error and requires no additional sensors, relying only
on signals already available to the controller. The algorithm is
independent from the load and control strategy and provides very
fast diagnostics, with diagnostic times as low as 2 sample periods
(in favorable conditions). Simulation results are presented for the
diagnostic algorithm, when used in a NPC rectifier with 3, 5 and 7
levels, showing its speed, effectiveness and robustness.