Fault tolerance in active power filters, based on multilevel NPC topology

Lopes, Pedro Faria; Mendes, André M. S.

doi:10.1109/iecon.2012.6388786

Cited by 9 publications

(10 citation statements)

References 19 publications

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“…For grid-connected converters, since it is necessary to measure the supply voltage, the pole voltage value can be obtained by using an estimation method. An estimation approach for IGBT OC fault is presented in [25] for a 3LNPC active power filter. However, under certain fault conditions, the faulty leg is disconnected from the DC bus, which will lead to a floating value of the pole voltage.…”

Section: Introductionmentioning

confidence: 99%

Open‐circuit fault diagnosis for a fault‐tolerant three‐level neutral‐point‐clamped STATCOM

Guo

Xia

et al. 2019

IET Power Electronics

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This study presents an open-circuit fault diagnosis method for a fault-tolerant three-level neutral-point-clamped static synchronous compensator (STATCOM). Since STATCOM only outputs reactive current, misdiagnosis may occur by utilising conventional methods. The proposed method relies on the measurement of three-phase currents and is able to identify the faulty switch within 10 ms. The diagnosis method uses the residuals of three-phase currents to detect the faults and locate the faulty switch pair. In addition, the root-mean-square value of the faulty phase current for a quarter of the current period is used to identify the faulty switch. Only the sensors that already exist in the system are required for the diagnosis method, which avoids the use of additional hardware circuits. Experimental results demonstrate the effectiveness and robustness of the proposed fault diagnosis strategy.

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Section: Introductionmentioning

confidence: 99%

Open‐circuit fault diagnosis for a fault‐tolerant three‐level neutral‐point‐clamped STATCOM

Guo

Xia

et al. 2019

IET Power Electronics

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“…An APF OC fault diagnosis and tolerance method based on a NPC 3-level was proposed in [37]. This method is based on a direct comparison between estimated filter line voltages and the expected voltages without additional sensors.…”

Section: Introductionmentioning

confidence: 99%

“…This method is based on a direct comparison between estimated filter line voltages and the expected voltages without additional sensors. However, the calculation precision cannot be guaranteed and no experimental results are given in [37].…”

Section: Introductionmentioning

confidence: 99%

“…In [37]- [39], the voltage error was estimated by using circuit equations, where di/dt must be involved. In a discrete digital control system, di/dt is calculated by using the last period value i(k-1)(k=1,2,3…) and T S , which means that a T S time delay constantly exists.…”

Section: Introductionmentioning

confidence: 99%

“…The error can be reduced by a higher sampling frequency, but it cannot be eliminated. This has a direct influence on the OC fault diagnosis, which was not considered in [37]- [39].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

IGBT Open-Circuit Fault Diagnosis for 3-Phase 4-Wire 3-Level Active Power Filters based on Voltage Error Correlation

Wang¹,

Tang²,

Zhang³

et al. 2016

Journal of Power Electronics

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A novel open-circuit fault diagnosis method for 3-phase 4-wire 3-level active power filters based on voltage error correlation is proposed in this paper. This method is based on observing the output pole voltage error of the active power filter through two kinds of algorithms. One algorithm is a voltage error analytical algorithm, which derives four output voltage error analytic expressions through the pulse state, current value and dc bus voltage, respectively, assuming that all of the IGBTs of a certain phase come to an OC fault. The other algorithm is a current circuit equation algorithm, which calculates the real-time output voltage error through basic circuit theory. A correlation is introduced to measure the similarity of the output voltage errors between the two algorithms, and OC faults are located by the maximum of the correlations. A FPGA has been chosen to implement the proposed method due to its fast prototyping. Simulation and experimental results are presented to show the performance of the proposed OC fault diagnosis method.

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Open-circuit fault diagnosis in Neutral-Point-Clamped active power filters based on instant voltage error with no additional sensors

Caseiro

Mendes

Lopes

2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Fault tolerance in active power filters, based on multilevel NPC topology

Cited by 9 publications

References 19 publications

Open‐circuit fault diagnosis for a fault‐tolerant three‐level neutral‐point‐clamped STATCOM

Open‐circuit fault diagnosis for a fault‐tolerant three‐level neutral‐point‐clamped STATCOM

IGBT Open-Circuit Fault Diagnosis for 3-Phase 4-Wire 3-Level Active Power Filters based on Voltage Error Correlation

Open-circuit fault diagnosis in Neutral-Point-Clamped active power filters based on instant voltage error with no additional sensors

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