A Method for Open-Circuit Faults Detecting, Identifying, and Isolating in Cascaded H-Bridge Multilevel Inverters

Mhiesan, Haider; Umuhozs, Janviere; Mordi, Kenneth; McCann, Roy; Balda, Juan Carlos; Farnell, Chris; Mantooth, Alan

doi:10.1109/pedg.2018.8447855

Cited by 20 publications

(5 citation statements)

References 21 publications

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“…They are designed for SCF detection and, consequently, protect conventional voltagesource converters from failures in DC-link capacitors or remaining healthy switches [27]. Hence, additional measures are required for detecting the OCFs [28]. There are several methods capable of detecting both OCF and SCF at the cost of auxiliary sensors and digital signal processing: voltage sensing of magnetic components through auxiliary windings [29], diode voltage sensing [30], capacitor current sensing [31], inductor current sensing using custom Rogowski coil [32] or conventional sensors [33], etc.…”

Section: Fault Identification Routinementioning

confidence: 99%

Topology-Morphing Photovoltaic Microconverter With Wide MPPT Voltage Window and Post-Fault Operation Capability

et al. 2020

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In this paper the concept of wide input voltage range photovoltaic microconverter with postfault operation capability is presented. This microconverter could remain operational in the case of short-or open-circuit failure of any switch of its front-end inverter. When the fault occurs, the control system automatically identifies the fault and applies the special post-fault modulation sequence thus keeping the functionality of the microconverter unchanged. The research findings are validated by the help of a 350 W experimental prototype specially developed for integration of silicon PV modules into the residential DC nanogrids with the nominal voltage of 350 V. Paper explains the multi-mode operation principle and fault identification routine. It presents the experimental efficiencies and evaluates the maximum power point tracking performance of the microconverter prior and after the short-circuit fault of an upper switch of the inverter. The daily energy yield test conducted for both cases has confirmed that the proposed approach can extend the service life of PV microconverters with a moderate impact on their performance. INDEX TERMS DC-DC power converters, digital control, fault diagnosis, fault tolerance, fault-tolerant control, photovoltaic systems, power electronics, pulse width modulation, quasi-Z-source converters.

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Section: Fault Identification Routinementioning

confidence: 99%

Topology-Morphing Photovoltaic Microconverter With Wide MPPT Voltage Window and Post-Fault Operation Capability

et al. 2020

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“…This paper adopts a new fault‐tolerant and robust cascaded 33 inverter to overcome the issues mentioned earlier. This paper focuses on fault‐tolerant topology only, the fault detection method in Mhiesan et al 34 used to detect the fault. This fault‐tolerant CHB inverter has a novel cross‐connected(X) HB cell to provide smooth and reliable operation in case of switch fault.…”

Section: Introductionmentioning

confidence: 99%

Grid integration of three phase solar powered fault‐tolerant cascaded H‐bridge inverter

Rajesh

Nakka

Kishore

2022

Circuit Theory & Apps

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Grid integration of solar photovoltaic (PV) systems is becoming popular recently due to the merits of stable support to conventional grid, limiting global warming and reduced emissions. However, maintaining capacitor voltage balancing, unity power factor, sinusoidal grid current, and harmonic profile improvement are challenging tasks owing to change in irradiation conditions. Multilevel inverters (MLI) in grid-connected systems will enhance the system's power quality in terms of voltage and current total harmonic distortion (THD). One of the most promising multilevel topologies for renewable energy applications is the cascaded H-bridge (CHB) inverter. Since CHB inverters include many components, they have a higher risk of failure, lowering system reliability. Due to the change in irradiation condition, the voltage across the corresponding DC link capacitor may vary. Therefore, the DC-link capacitor balancing is mandatory and done by an individual control scheme. This paper presents a highly reliable, robust, and modular solar PV-fed faulttolerant CHB inverter with an individual voltage/current control strategy for grid integration. Higher reliability and modularity, power factor correction, and harmonic profile improvement are the main objectives of the proposed system. The proposed system has been simulated in MATLAB/Simulink and validated with experimental results on the developed prototype for different irradiation conditions.

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“…In comparison to conventional two-level inverters, multilevel inverters generate lower harmonic voltage/current, since they are characterized by a multilevel quasi-sinusoidal waveform. Various multilevel inverter topologies have been proposed in the literature, such as the PUC5 topology [1][2][3][4][5][6][7][8][9][10][11][12][13], which was introduced to provide good quality power and reduce the number of components compared to its predecessors. Insulated gate bipolar transistors (IGBT) are typically used as power switches in multilevel inverters due to their high voltage and current ratings.…”

Section: Introductionmentioning

confidence: 99%

“…A cascaded hbridge (CHB) multilevel inverter can be diagnosed by monitoring each cell's output voltage and current direction. The technique has been implemented using level-shifted pulse width modulation (LS-PWM) in order to achieve an acceptable total harmonic distortion (THD), as described in Reference [5]. The use of multilayer perceptron's for classification and localization of the fault type is discussed in Reference [6].…”

Section: Introductionmentioning

confidence: 99%

Open-Circuit Fault Detection in a Multilevel Inverter Using Sub-Band Wavelet Energy

Khan

Shees²,

Alsharekh

et al. 2021

Electronics

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Recent research has focused on sustainable development and renewable energy resources, thus motivating nonconventional cutting-edge technology development. Multilevel inverters are cost-efficient devices with IGBT switches that can be used in ac power applications with reduced harmonics. They are widely used in the power electronics industry. However, under extreme stress, the IGBT switches can experience a fault, which can lead to undesirable operation. There is a need for a reliable system for detecting switch faults. This paper proposes a signal processing method to detect open-circuit problems in IGBT switches. Relative wavelet energy has been used as a feature for a machine learning algorithm to diagnose and classify the faulted switches. The switching sequence can be altered to restore a healthy output voltage. Inverter faults have been diagnosed by using support vector machine (SVM) and decision tree (DT), and an ensemble model based on decision tree (DT) and XG boost algorithm was developed, which yielded 92%, 88%, and 94.12% accuracy, respectively.

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A Method for Open-Circuit Faults Detecting, Identifying, and Isolating in Cascaded H-Bridge Multilevel Inverters

Cited by 20 publications

References 21 publications

Topology-Morphing Photovoltaic Microconverter With Wide MPPT Voltage Window and Post-Fault Operation Capability

Topology-Morphing Photovoltaic Microconverter With Wide MPPT Voltage Window and Post-Fault Operation Capability

Grid integration of three phase solar powered fault‐tolerant cascaded H‐bridge inverter

Open-Circuit Fault Detection in a Multilevel Inverter Using Sub-Band Wavelet Energy

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