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Open AccessArticle

Enhanced Threshold Point Calculation Algorithm for Switch Fault Diagnosis in Grid Connected 3-Phase AC–DC PWM Converters

1
Department of Electrical and Computer Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si 16419, Gyeonggi-do, Korea
2
Intelligent Mechatronics Research Center, Korea Electronics Technology Institute (KETI) 388, Songnae-daero, Wonmi-gu, Bucheon-si 14502, Gyeonggi-do, Korea
*
Author to whom correspondence should be addressed.
Energies 2019, 12(10), 1979; https://doi.org/10.3390/en12101979
Received: 6 May 2019 / Revised: 20 May 2019 / Accepted: 21 May 2019 / Published: 23 May 2019
(This article belongs to the Special Issue Fault Diagnosis and Fault-Tolerant Control)
The resilience of systems with alternating current (AC)–direct current (DC) converters has been investigated with the aim of improving switch fault diagnosis. To satisfy this aim, this paper proposes a switch fault diagnosis algorithm for three-phase AC–DC converters. The proposed algorithm operates using the phase current instead of the average current to reduce the calculation time required for fault switch detection. Moreover, a threshold point calculation method is derived using a theoretical analysis, which was lacking in previous research. Using the calculated threshold point, a switch fault diagnosis algorithm is obtained to detect faults independent of the load condition. Using the proposed algorithm, switch faults can be detected within 4 ms, which is the recommended value for uninterruptible power supply (UPS). The theoretical analysis, the operating principle, and the experimental results on a 3-kW grid-tied AC–DC converter test-bed are presented herein, which verify the performance of the proposed algorithm. View Full-Text
Keywords: AC–DC power conversion; fault diagnosis; counting method; threshold point AC–DC power conversion; fault diagnosis; counting method; threshold point
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Koo, G.W.; Joo, D.; Lee, B.K. Enhanced Threshold Point Calculation Algorithm for Switch Fault Diagnosis in Grid Connected 3-Phase AC–DC PWM Converters. Energies 2019, 12, 1979.

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