Fault-Tolerant Neutral-Point-Clamped Converter Solutions Based on Including a Fourth Resonant Leg

Ceballos, Salvador; Pou, Josep; Zaragoza, Jordi; Robles, Eider; Villate, J.L.; Martin, J.L.

doi:10.1109/tie.2010.2069075

Cited by 90 publications

(39 citation statements)

References 36 publications

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“…In some applications, higher reliability of the circuit is required that it is even expected that the circuit should keep working for a period under the device failures. So, in recent years, the research of fault-tolerant control for multilevel inverters has attracted wide attention from scholars [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Fault-Tolerant Control Strategy for Neutral-Point-Clamped Three-Level Inverter

Shen

Beibei

et al. 2018

Journal of Control Science and Engineering

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A fault-tolerant control technique is discussed for the Neutral-Point-Clamped (NPC) three-level inverter, which ensures that the NPC inverter operates normally even under device failures. A two-level leg is added to the NPC inverter; when the device open circuit fault occurs, the load of this faulty phase is connected to the neutral point of this two-level leg through the bidirectional thyristors. An improved Space Vector Pulse Width Modulation (SVPWM) strategy called "addition and subtraction substitution SVPWM" is proposed to effectively suppress fluctuation in capacitor neutral-point voltages by readjusting the sequence and action time of voltage vectors. The fault-tolerant topology in this paper has the advantages of fewer switching devices and lower circuit costs. Experimental results show that the proposed fault-tolerant system can operate in balance of capacitor neutral-point voltages at full output power and the reliability of the inverter is greatly enhanced.

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Section: Introductionmentioning

confidence: 99%

Fault-Tolerant Control Strategy for Neutral-Point-Clamped Three-Level Inverter

Shen

Beibei

et al. 2018

Journal of Control Science and Engineering

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“…Several researchers introduced fault-tolerant strategies for the well-known topologies such as an NPC inverter [14], [15], a flying capacitor inverter [16], an H-bridge multilevel inverter [17], [18], etc. In [14] and [15], the additional fourth leg replaces the faulty leg when the fault occurs.…”

Section: Introductionmentioning

confidence: 99%

Diagnosis and Tolerant Strategy of an Open-Switch Fault for T-Type Three-Level Inverter Systems

Choi

Lee

Blaabjerg

2014

IEEE Trans. on Ind. Applicat.

212

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This paper proposes a new diagnosis method of an open-switch fault and fault-tolerant control strategy for T-type three-level inverter systems. The location of the faulty switch can be identified by the average of the normalized phase current and the change of the neutral-point voltage. The proposed faulttolerant strategy is explained by dividing into two cases: the faulty condition of half-bridge switches and neutral-point switches. The performance of the T-type inverter system improves considerably by the proposed fault-tolerant algorithm when a switch fails. The proposed method does not require additional components and complex calculations. Simulation and experimental results verify the feasibility of the proposed fault diagnosis and fault-tolerant control strategy.

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“…In this way, several strategies have been proposed [6,7] to cope with the problem, including the use of novel modulation techniques [8], or improving the performance of others previously considered [9], to name a few. Important research is still being made in this field considering various approaches [10,11].…”

Section: Introductionmentioning

confidence: 99%

Voltage balancing in three-level neutral-point-clamped converters via Luenberger observer

Umbría

Gordillo

Gómez-Estern

et al. 2014

Control Engineering Practice

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This paper addresses the problems associated with the dc-link capacitor voltages of the three-level neutral-point-clamped power converter: the imbalance of the capacitor voltages as well as the presence of an ac-voltage low-frequency oscillation in the dc link of the converter. In order to cope with them, a mathematical analysis of the capacitor voltage difference dynamics, based on a direct average continuous model, is carried out, considering a singular perturbation approach. The analysis leads to a final expression where a sinusoidal disturbance appears explicitly. Consequently, the two problems can be handled together using the ordinary formulation of a problem of regulating the output of a system subject to sinusoidal disturbances, applying classical control theory to design the controller. In this way, the controller is designed including the disturbance estimate provided by a Luenberger observer to asymptotically cancel the disturbance, while keeping also balanced the capacitor voltages. Experiments for a synchronous threelevel neutral-point-clamped converter prototype are carried out to evaluate the performance and usefulness of the converter working as a grid-connected inverter under the proposed control law.

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Fault-Tolerant Neutral-Point-Clamped Converter Solutions Based on Including a Fourth Resonant Leg

Cited by 90 publications

References 36 publications

Fault-Tolerant Control Strategy for Neutral-Point-Clamped Three-Level Inverter

Fault-Tolerant Control Strategy for Neutral-Point-Clamped Three-Level Inverter

Diagnosis and Tolerant Strategy of an Open-Switch Fault for T-Type Three-Level Inverter Systems

Voltage balancing in three-level neutral-point-clamped converters via Luenberger observer

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