A New Model-Based Fault Detection and Localization Scheme for Cascaded H-bridge Multilevel Converter

Gorla, Naga Brahmendra Yadav; Kolluri, Sandeep; Chai, Merlin; Panda, Sanjib Kumar

doi:10.1109/ecce44975.2020.9236140

Cited by 6 publications

(1 citation statement)

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“…The assumption-verification method is adopted to locate the faulty switch within 50ms, taking a longer locating time when multiple faults occur. Similarly, the estimation error of grid current is used for the fault detection, and the modulation method is changed for fault localization in [18], where the specific time instants need to be obtained, and the changed modulation results in increased current harmonics. According to the model predictive control (MPC) features, the literature [19] compares the predicted current with the actual one to detect the fault, and single or multiple open-circuit faults are diagnosed by the 2168-6777 (c) 2021 IEEE.…”

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confidence: 99%

A Voltage-Based Multiple Fault Diagnosis Approach for Cascaded H-Bridge Multilevel Converters

Xie

Wang

et al. 2022

IEEE J. Emerg. Sel. Topics Power Electron.

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This paper proposes a fast and robust opencircuit fault diagnosis method without additional sensors for cascaded H-bridge multilevel converters (CHBMCs). The method is based on the error between the actual input-side voltage and the estimated one, with one detection threshold and 2n comparators in n cascaded Hbridges. Benefit from the simple design of the fault location, spike elimination, and parameter estimation, with the lower implementation burden, the single and multiple faults in arbitrary positions are accurately identified within a fundamental cycle, and the diagnostic robustness is guaranteed under different transient changes. In view of the low complexity, the proposed scheme can be easily applied to the CHBMCs with arbitrary modules. The experimental results from a CHBMC prototype verify the effectiveness of the proposed method under different operating conditions and fault scenarios. 1 Index Terms-cascaded H-bridge multilevel converters (CHBMCs), open-circuit fault, voltage error, fault detection and localization, multiple switch faults I. INTRODUCTIONConsidering the cost-effective trade-off for the mediumvoltage high-power system, the multilevel converters have emerged as an important topology in industrial applications due to their superior advantages of higher efficiency, lower harmonic distortion, and flexible expandability [1], [2]. Among different multilevel converters, the cascaded H-bridge multilevel converters (CHBMCs) are one of the most valuable structures thanks to the high scalability and fault tolerance [3], popularly applied to the photovoltaic systems [4], static synchronous compensators (STATCOM) [5], solid-state transformers [6], and traction applications [7]. The CHBMCs generally operate as a single-phase rectifier in the traction Manuscript

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confidence: 99%