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Open-Circuit Fault Diagnosis in Neutral-Point-Clamped UPS Inverters with no Additional Sensors

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

Open-Circuit Fault Diagnosis in Neutral-Point-Clamped UPS Inverters with no Additional Sensors, Proc IEEE Industrial Electronics Conf. - IECON, Yokohama, Japan, Vol. 1, pp. 1 - 6, November, 2015.

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Abstract
The operating conditions of UPS inverters and the
fact that the load is unknown lead to great difficulties in fault
diagnosis. This paper proposes the use of a fault diagnosis
algorithm based on estimated pole voltage error for UPS inverters
based on the 3-level Neutral-Point-Clamped topology. This algorithm
is independent from the load and is not affected by
unbalanced three-phase operation. This algorithm provides very
fast and reliable results and requires no additional sensors or
hardware. Simulation results are presented to demonstrate the
algorithm’s speed and robustness.