Post-fault reconfiguration for a versatile and hybrid 4 Leg NPC-flying capacitor topology

Abdelghani, Hafedh Ben; Abdelghani, Afef Bennani-Ben; Richardeau, Frédéric; Blaquière, Jean-Marc; Mosser, Franck

doi:10.1109/isie.2014.6864837

Cited by 10 publications

(9 citation statements)

References 6 publications

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“…Nevertheless, due to practical implementation, a low‐size LC filter must be included [22]. The LC filter capacitor of Fig.…”

Section: Hybrid Npc‐fc Topologymentioning

confidence: 99%

“…5 a . The mathematical modelling of the (1L–3L–3L) faulty mode leads to six active voltage vectors (with an amplitude of E /3) and one zero voltage vector that can be used to control the reconfigured converter [29].…”

Section: Normal Condition and Post‐fault Operationsmentioning

confidence: 99%

“…Ceballos et al [20, 21] have proposed to add a fourth three‐level FC‐based topology, at 50% duty ratio and quasi‐zero voltage ripple, which is controlled, under normal conditions, in order to guarantee a balanced NP voltage without low‐frequency oscillation, independent of the NP current sign and with easy control of the NPC legs. However, an important issue with this hybrid topology is the mutual interactions between the two topologies [22]: on the one hand, the dead times introduced into the FC commutation cells affect the 3L‐NPC output voltages. On the other hand, the NP current injected by the 3L‐NPC into the FC leg leads to a possible imbalance of its FC voltage.…”

Section: Introductionmentioning

confidence: 99%

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Fault tolerant‐topology and controls for a three‐level hybrid neutral point clamped‐flying capacitor converter

Abdelghani

Richardeau

et al. 2016

IET Power Electronics

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This study details a three-level hybrid fault-tolerant converter. The definition of an original decoupling solution between the fourth flying capacitor (FC) leg and the three neutral point (NP) clamped-based phases overcomes topology hybridisation issues. Under normal conditions, a control strategy of the FC-based leg leads to a converter NP voltage balance, and decreases the DC side capacitors' volume and cost. Under fault conditions, the presented fault isolation and converter reconfiguration strategies generate a post-fault converter, which is able to operate safely with the added FC-based leg. The proposed topology is an interesting trade-off between converter fault-tolerant capability and its complexity and offers the ability to be simply reconfigured and controlled in the case of switch fault occurrence. Two operation modes under fault conditions are presented and their performances are shown and discussed through simulation results and first experimental tests.

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“…Nevertheless, due to practical implementation, a low‐size LC filter must be included [22]. The LC filter capacitor of Fig.…”

Section: Hybrid Npc‐fc Topologymentioning

confidence: 99%

Section: Normal Condition and Post‐fault Operationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fault tolerant‐topology and controls for a three‐level hybrid neutral point clamped‐flying capacitor converter

Abdelghani

Richardeau

et al. 2016

IET Power Electronics

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“…According to the topology, the researches on fault-tolerant control of multilevel inverter are mainly as follows: Fault-tolerance of neutral point clamped (NPC) inverter [6], fault-tolerance of cascaded inverter [7], fault-tolerance of flying capacitor inverter [8], fault-tolerance of hybrid NPC four-leg inverter [9], and fault-tolerance of T-type inverter [10], etc. For all of these, the fault-tolerant control of cascaded multilevel inverters can be divided into hardware method and software method.…”

Section: Introductionmentioning

confidence: 99%

Voltage Space Vector Equivalent Substitution Fault-Tolerance Control for Cascaded H-Bridge Multilevel Inverter with Current-Tracking

Liu

Wang

2020

Electronics

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A novel fault-tolerant control method based on the equivalent substitution of voltage space vector for cascaded H-bridge multilevel inverter with current-tracking is proposed in this paper. With this method, the fault effects on the voltage vector of each sector of the cascaded inverter is analyzed first. Then, an algorithm to substitute the voltage vector in fault state is developed. In the fault state, if the voltage vector selected by the original algorithm cannot be used normally, the redundant voltage vector with the position coincidence is preferentially selected for equivalent substitution. If there is no redundant coincidence vector, select the other vector whose position and effect are closest to it. Compared with the commonly used N + 1 redundancy method, this method does not require the spare cascaded units and can be applied to any class cascaded H-bridge multilevel inverter with current-tracking to improve its reliability. Finally, the effectiveness of the proposed method is validated by simulation and experiment results.

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“…However, fault detection and the method of blowing up fuses were not discussed and the practical implementation issues were not detailed. In [34], the authors show the FC IGBT's dead time effect on the FC output voltage for this fault tolerant hybrid topology and claim to add an LC filter to overcome this issue.…”

Section: Introductionmentioning

confidence: 99%

Versatile Three-Level FC-NPC Converter With High Fault-Tolerance Capabilities: Switch Fault Detection and Isolation and Safe Postfault Operation

Abdelghani

Richardeau

et al. 2017

IEEE Trans. Ind. Electron.

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This paper deals with a hybrid fault-tolerant converter topology. It is performed through the connection of a classical three-phase three-level Neutral Point Clamped (3L-NPC) converter with a fourth three-level Flying Capacitor (3L-FC) leg. The 3L-FC leg actively balances the 3L-NPC neutral point voltage. For normal operation mode, this paper proposes a mathematical design of the filter needed to connect these two different topologies. Experimentally, and thanks to the already existing decoupling capacitors of the 3L-NPC converter, this filter requires the addition of only one low size inductance. When one fault of the power switch of the 3L-NPC occurs, the paper proposes hardware reconfiguration technique based on only two fuses and one thyristor per leg allows a safe post-fault operation recovery. This is achieved thanks to a simple faultdetection method and a new technique that combines fault leg isolation and corresponding phase post-fault connection to the neutral point. Also, a dedicated FPGA-based control of the reconfigured converter is synthetized to ensure power system availability under fault operation mode. The converter fault-tolerant capabilities are addressed through simulation results and original overall experimental validations of the fault detection and isolation and the post-fault operation steps, carried out on a 15 kW prototype converter.

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Post-fault reconfiguration for a versatile and hybrid 4 Leg NPC-flying capacitor topology

Cited by 10 publications

References 6 publications

Fault tolerant‐topology and controls for a three‐level hybrid neutral point clamped‐flying capacitor converter

Fault tolerant‐topology and controls for a three‐level hybrid neutral point clamped‐flying capacitor converter

Voltage Space Vector Equivalent Substitution Fault-Tolerance Control for Cascaded H-Bridge Multilevel Inverter with Current-Tracking

Versatile Three-Level FC-NPC Converter With High Fault-Tolerance Capabilities: Switch Fault Detection and Isolation and Safe Postfault Operation

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