Detection and Localization Strategy for Switch Open-Circuit Fault in Modular Multilevel Converters

Geng, Zhi; Han, Minxiao; Khan, Zmarrak Wali; Zhang, Xin

doi:10.1109/tpwrd.2020.2972355

Cited by 21 publications

(14 citation statements)

References 22 publications

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“…In [33] and [34], multiple OC faults with different types are considered. In [33], arm voltage is measured and compared the predicted value.…”

Section: A Diagnosis Of Oc Switching Faultmentioning

confidence: 99%

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On-line fault diagnosis and fault-tolerant operation of modular multilevel converters — A comprehensive review

Yang

Wang

2020

Trans. Electr. Mach. Syst.

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“…In [33] and [34], multiple OC faults with different types are considered. In [33], arm voltage is measured and compared the predicted value.…”

Section: A Diagnosis Of Oc Switching Faultmentioning

confidence: 99%

“…The faulty SM is located through comparing the switching signal and error of the arm voltages. In [34], the capacitor voltage differences are used to pinpoint the position of faulty SM(s). The faulty devices are located based on the capacitor voltage under different current and switching command conditions.…”

Section: A Diagnosis Of Oc Switching Faultmentioning

confidence: 99%

On-line fault diagnosis and fault-tolerant operation of modular multilevel converters — A comprehensive review

Yang

Wang

2020

Trans. Electr. Mach. Syst.

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“…IGBT damage is the most common cause of sub-module failure [ 6 ], generally due to short-circuit faults or open-circuit faults [ 7 ]. Compared to the IGBT short-circuit fault, the IGBT open-circuit faults can last for a long time without being detected, which can deteriorate the output of the MMCs and can make the capacitors in the faulty SMs over-charged [ 8 ]. Therefore, this paper is concerned with the IGBT open-circuit fault diagnosis of Modular Multilevel Converters in High Voltage Direct Current (MMC-HVDC) systems.…”

Section: Introductionmentioning

confidence: 99%

Open-Circuit Fault Detection and Classification of Modular Multilevel Converters in High Voltage Direct Current Systems (MMC-HVDC) with Long Short-Term Memory (LSTM) Method

Wang

Ahmed

et al. 2021

Sensors

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Fault detection and classification are two of the challenging tasks in Modular Multilevel Converters in High Voltage Direct Current (MMC-HVDC) systems. To directly classify the raw sensor data without certain feature extraction and classifier design, a long short-term memory (LSTM) neural network is proposed and used for seven states of the MMC-HVDC transmission power system simulated by Power Systems Computer Aided Design/Electromagnetic Transients including DC (PSCAD/EMTDC). It is observed that the LSTM method can detect faults with 100% accuracy and classify different faults as well as provide promising fault classification performance. Compared with a bidirectional LSTM (BiLSTM), the LSTM can get similar classification accuracy, requiring less training time and testing time. Compared with Convolutional Neural Networks (CNN) and AutoEncoder-based deep neural networks (AE-based DNN), the LSTM method can get better classification accuracy around the middle of the testing data proportion, but it needs more training time.

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“…This paper focuses on FTO. The fault detection and localization method is used to detect and locate the SM fault in the shortest possible time as discussed in [8]- [10]. A model predictive control strategy has been proposed in [8] for fault detection approach that uses the error between the estimated capacitor voltages and the measured ones to locate the faulty SM.…”

Section: Introductionmentioning

confidence: 99%

“…This scheme offers robustness against system parameter uncertainty. In [10] a new method has been proposed where multiple SM faults are detected at the moment. FTO of MMC has been investigated in [11]- [21].…”

Section: Introductionmentioning

confidence: 99%

DC Voltage Control and OLTC Control Strategy for MMC-Based HVDC System Under SM Failure

2021

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The Modular multilevel converters (MMCs) have excellent performance when operated with high modulation index such as the case of gird-connected converters in high voltage direct current (HVDC) system. Reliable and fault tolerant operation (FTO) of the system is very important in HVDC. A novel FTO algorithm under sub module failure without using any additional redundant SMs is proposed. In the proposed method, the direct current bus voltage control and on-load tap changer (OLTC) control strategy are combined for interruption free operation of the system without any additional voltage stress on switching devices and performance degradation of the system during fault. The analytical details of the normal as well as FTO operation are given. The proposed FTO strategy is verified through simulation and also experimentally using a prototype. The simulation and experimental results are presented. INDEX TERMSfault tolerant operation (FTO). high voltage direct current (HVDC), On load tap changer (OLTC), Multi-level converters(MLCs), modular multilevel converter (MMC), pulse width modulation (PWM), voltage source converters (VSC), sub module (SM) failure

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Detection and Localization Strategy for Switch Open-Circuit Fault in Modular Multilevel Converters

Cited by 21 publications

References 22 publications

On-line fault diagnosis and fault-tolerant operation of modular multilevel converters — A comprehensive review

On-line fault diagnosis and fault-tolerant operation of modular multilevel converters — A comprehensive review

Open-Circuit Fault Detection and Classification of Modular Multilevel Converters in High Voltage Direct Current Systems (MMC-HVDC) with Long Short-Term Memory (LSTM) Method

DC Voltage Control and OLTC Control Strategy for MMC-Based HVDC System Under SM Failure

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