Study on Fault Tolerant Control Strategy for Sub-modules of Modular Multilevel Converter

Zhang, Hui; Shao, Wenquan; Wei, Xiaohui; Li, Ning

doi:10.1109/aeees48850.2020.9121531

Cited by 7 publications

(5 citation statements)

References 4 publications

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“…According to the operation status of the redundant SMs during system normal operation, hardware-based methods can be classified into cold reserve method [18] (also called passive method [16,17] or spare process [19]) and hot reserve method [20][21][22][23][24][25][26][27] (also called active method [16,17]). In cold reserve methods, all the redundant SMs are bypassed during system normal operation.…”

Section: Hardware-based Methodsmentioning

confidence: 99%

“…In this method, the modulation signal of each SM varies at all times, which increases the control complexity. Reference [27] combines the nearest level modulation (NLM) and sorting voltage balance control techniques to select the SMs to be inserted. These methods can realize seamless replacement when SMs fail; however, the power loss of the bypassed SMs cannot be ignored and the SM utilization rate is low.…”

Section: Hardware-based Methodsmentioning

confidence: 99%

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Semi‐hot redundant control method for modular multilevel converter‐based high‐voltage direct current systems under submodules fault

Yang

Jia

Zou

et al. 2023

IET Power Electronics

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A modular multilevel converter‐based high voltage direct current (MMC‐HVDC) system involves a large number of cascading submodules (SMs). The failure of SMs may critically degrade the system performance. Therefore, several redundant SMs can be incorporated and reasonably controlled to ensure the system reliable and continuous operation even if certain SMs fail. This paper proposes a semi‐hot redundant method for MMC‐HVDC systems. In the proposed strategy, when the system operates normally, the redundant SMs are controlled in a lower voltage range. These SMs do not require frequent charging and discharging, which decreases the switching loss. When ordinary SMs fail, the faulty SMs are bypassed and the corresponding number of redundant SMs can be promptly recharged to the rated voltage to replace the faulty SMs. The semi‐hot reserved SMs can shorten the transient process of faulty SMs replacement, and in this process, the absence of faulty SMs does not considerably influence the system. Thus, the original control and modulation strategies of the system do not need to be modified when several SMs fail. The performance of the proposed method is compared with those of the existing methods, and its validity is demonstrated through a small‐scale experimental prototype.

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Section: Hardware-based Methodsmentioning

confidence: 99%

Section: Hardware-based Methodsmentioning

confidence: 99%

Semi‐hot redundant control method for modular multilevel converter‐based high‐voltage direct current systems under submodules fault

Yang

Jia

Zou

et al. 2023

IET Power Electronics

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show abstract

“…The NLC is also proposed in [133], as an alternative to avoid complex multiple carrier coordination (PS-PWM) or control modification in fixed-voltage hot-redundant mode (Strategy 3). The method is validated through simulation, however, high circulating currents of 7.5 pu arise when the method is activated 100 ms after the fault occurrence.…”

Section: B Hot-redundant Mode Reconfiguration Strategiesmentioning

confidence: 99%

Faults in Modular Multilevel Cascade Converters–Part II: Fault Tolerance, Fault Detection and Diagnosis, and System Reconfiguration

Rojas

Jerez

Hackl

et al. 2022

IEEE Open J. Ind. Electron. Soc.

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Modular Multilevel Cascade Converters (MMCCs) are considered a promising power electronics topology in industry. Their scalability allows to reach (ultra/very) high voltage levels with low harmonic content and high efficiency and makes MMCCs an ideal solution for high-power applications; such as electrical drives, solid-state transformers and high-voltage direct-current (HVDC) transmission systems. However, the high levels of thermal, electrical and mechanical stress on the power electronics devices and the large number of components (e.g. capacitors or semiconductors) make MMCCs prone to faults. Fault detection and diagnosis (FDD) in combination with fault isolation and system reconfiguration techniques, based on cell redundancy, can increase the reliability, availability and safety of MMCCs, which is crucial for their utilization in critical energy applications. This second part of the paper comprehensively surveys: (i) fault tolerance and fault detection & diagnosis (FDD; e.g. expert system, model-or hardware and data-based FDD methods) and (ii) system reconfiguration strategies (e.g. cold-or hot-redundant) for MMCCs. Finally, the state-of-the-art, challenges and future research trends and opportunities towards reliable MMCC-based systems are revealed.

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“…Therefore, the energy storage converter connected to the medium voltage DC (MVDC) grid needs to be characterized by high voltage and large capacity, voltage conversion, electrical isolation and bidirectional conversion. It is widely used in high-voltage and large-power applications because of its modular structure and fault tolerance [6]. For high-voltage rail transit vehicles, the control strategies of super capacitor energy storage system based on Modular Multilevel Converter (MMC) are studied in [7], [8].…”

Section: Introductionmentioning

confidence: 99%

Bidirectional Power Control Strategy for Super Capacitor Energy Storage System based on MMC DC-DC Converter

Swetha¹,

Latha²,

Swathi³

et al. 2023

IJRASET

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In order to equip more high-energy pulse loads and improve power supply reliability, the vessel integrated power system shows an increasing demand for high-voltage and large-capacity energy storage systems. Based on this background, this paper focuses on a super capacitor energy storage system based on a DC-DC converter. This paper analyzes the different topology of Hybrid Energy Storage System (HESS) and Demand Management System using HESS. Taking into account the shortcomings of the traditional bidirectional power control strategy, this paper proposes a control strategy where the HESS module of each branch independently controls the voltage of the sub-module capacitor. The outputs are validated and verified using MATLAB Simulink platform.

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Study on Fault Tolerant Control Strategy for Sub-modules of Modular Multilevel Converter

Cited by 7 publications

References 4 publications

Semi‐hot redundant control method for modular multilevel converter‐based high‐voltage direct current systems under submodules fault

Semi‐hot redundant control method for modular multilevel converter‐based high‐voltage direct current systems under submodules fault

Faults in Modular Multilevel Cascade Converters–Part II: Fault Tolerance, Fault Detection and Diagnosis, and System Reconfiguration

Bidirectional Power Control Strategy for Super Capacitor Energy Storage System based on MMC DC-DC Converter

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