Faults analysis and remedial strategies in high power neutral point clamped converters

Bordignon, P.; Carpaneto, M.; Marchesoni, M.; Tenca, P.

doi:10.1109/pesc.2008.4592366

Cited by 20 publications

(10 citation statements)

References 6 publications

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“…The faulty circuit can be bypassed, and the converter can be reprogrammed to generate reduced voltage [254], [255]. In [256]- [259], fault analysis and fault operation for an NPC and ANPC are presented.…”

Section: Recent Advances In Control and Operational Issuesmentioning

confidence: 99%

Recent Advances and Industrial Applications of Multilevel Converters

Kouro

Malinowski

Gopakumar

et al. 2010

IEEE Trans. Ind. Electron.

3,362

1,276

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Multilevel converters have been under research and development for more than three decades and have found successful industrial application. However, this is still a technology under development, and many new contributions and new commercial topologies have been reported in the last few years. The aim of this paper is to group and review these recent contributions, in order to establish the current state of the art and trends of the technology, to provide readers with a comprehensive and insightful review of where multilevel converter technology stands and is heading. This paper first presents a brief overview of well-established multilevel converters strongly oriented to their current state in industrial applications to then center the discussion on the new converters that have made their way into the industry. In addition, new promising topologies are discussed. Recent advances made in modulation and control of multilevel converters are also addressed. A great part of this paper is devoted to show nontraditional applications powered by multilevel converters and how multilevel converters are becoming an enabling technology in many industrial sectors. Finally, some future trends and challenges in the further development of this technology are discussed to motivate future contributions that address open problems and explore new possibilities.

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Section: Recent Advances In Control and Operational Issuesmentioning

confidence: 99%

Recent Advances and Industrial Applications of Multilevel Converters

Kouro

Malinowski

Gopakumar

et al. 2010

IEEE Trans. Ind. Electron.

3,362

1,276

View full text Add to dashboard Cite

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“…Thus, the average values of i x n pos [k] and i x n meg [k] are calculated by (10) and (11), respectively, where N is the total number of samples, k is the index of a sample and x is the inverter leg index As can be seen in Fig. 2, to identify the faulty switch, it is necessary to use these diagnostic variables together with the number of faulty IGBT pairs.…”

Section: Operation Of a 3lnpc Ac Drive Under Normal And Faulty Conditmentioning

confidence: 99%

Fault diagnostic algorithm for three‐level neutral point clamped AC motor drives, based on the average current Park's vector

Mendes¹,

Abadi²,

Cruz³

2014

IET Power Electronics

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This study presents a new fault diagnostic technique for a semiconductor open-circuit fault in a neutral-point clamped inverter, based on the average current Park's vector approach. This method relies on the measurement of two motor line currents and is able to perform a complete diagnosis in less than half of the inverter output current period. The implementation of this diagnostic technique requires no additional current or voltage sensors besides the ones already used by the control algorithm of the converter. The diagnostic method uses the modulus and angle of the normalised average current Park's vector to detect the fault and identify the faulty insulated gate bipolar transistor (IGBT) pair, respectively. Simultaneously, the normalised average values corresponding to the positive and negative parts of the motor supply currents waveforms are used to identify the inner faulty IGBTs with even and odd numbers, respectively. The diagnostic method is also robust to transient conditions imposed by load and speed variations. The performance and effectiveness of the proposed diagnostic technique are validated both by the simulation and experimental results.

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“…Most of such effort has been dedicated to the proposition of suitable solutions to disconnect the damaged converter from the power mains ( [4] - [7]). In [8] the authors address the current paths related to different possibilities of internal faults in the inverter and propose the addition of crow-bar circuits to limit the total converter damage extent.…”

Section: Introductionmentioning

confidence: 99%

“…At this point, one can conclude that, besides proper sizing and maintenance of the converter circuit breaker, correct coordination of the power devices I 2 t with the circuit breaker switching delay and short-circuit level at the converter connection point are the only issues to be addressed at the design stage. However, the existence of multiple short-circuit current paths in the converter [8] suggests that:…”

Section: Introductionmentioning

confidence: 99%

A Fault-Resilient Implementation of Three Level Npc Igct-Based Converters

Rocha¹,

Franca²,

Santos³

et al. 2011

Eletrônica de Potência

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This paper presents a strategy for protecting high power IGCT-based converters which are currently used in a wide range of drive applications. The protection of such converters against internal faults has been addressed in the technical literature, but the main focus has been on the solutions to disconnect the converter from the mains. In this paper, the short circuit current paths through the power devices are identified and studied from the perspective of keeping the overall repair cost after a fault to a minimum. It is shown that a preferred short-circuit current path that limits the thermal energy in all IGCTs to safe levels exists. Furthermore, it is demonstrated that it is possible to guarantee, through proper busbar geometry and/or device selection, that the short-circuit current stress can always be moved to the power diodes. Simulation results are presented to support all the discussions and conclusions, avoiding the costs and risks of tests on a medium voltage prototype. 1

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Faults analysis and remedial strategies in high power neutral point clamped converters

Cited by 20 publications

References 6 publications

Recent Advances and Industrial Applications of Multilevel Converters

Recent Advances and Industrial Applications of Multilevel Converters

Fault diagnostic algorithm for three‐level neutral point clamped AC motor drives, based on the average current Park's vector

A Fault-Resilient Implementation of Three Level Npc Igct-Based Converters

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