Reliability modelling and analysis on MMC for VSC‐HVDC by considering the press‐pack IGBT and capacitors failure

Li, Hui; Zheng, Min; Yao, Ran; Lai, Wu‐Wei; Deng, Jing; Long, Haiyang; Qu, Haitao

doi:10.1049/joe.2018.8909

Cited by 7 publications

(4 citation statements)

References 4 publications

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“…O conversor CHBé composto de vários componentes que podem falhar por diferentes razões, como falhas em circuito aberto ou em curto-circuito nos IGBTs, falhas no capacitor da célula, falhas na fonte de alimentação ou falhas no gate driver [8], [9]. Para manter a operação do conversor após uma ou mais falhas, células adicionais (chamadas células redundantes) são integradasà estrutura do conversor [10].…”

Section: Resumo -unclassified

Estratégia De Tolerância A Falhas Para Um Conversor Delta-Chb Statcom Na Região De Sobremodulacão

Mendonca¹,

Cupertino²,

Pereira³

et al. 2020

Eletrônica de Potência

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The cascaded H-bridge (CHB) is a popular topology for Static Synchronous Compensator (STATCOM) applications. Since this converter is composed of tens/hundreds of components, concerns related to reliability are inherent in the design of this converter. Generally, redundant cells are used, increasing the cost of STATCOM. Indeed, there is a potential for fault-tolerant operation when the overmodulation region is considered. This work explores the inherent redundancy of the delta-CHB in the overmodulation region. Initially, an analytical expression for the boundary between the linear region and overmodulation is determined and validated for different operating conditions. Then, the fault-tolerant is evaluated in a simulation environment, considering a case study of a 17 MVA/13.8 kV delta-CHB STATCOM composed of 24 cells per arm. Symmetric and asymmetric failures are addressed. The results indicate that the converter is capable of operating at rated conditions after 4 faults distributed in the three converter arms (5.5 % redundancy factor) without exceeding the recommended harmonic distortion values.

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Section: Resumo -unclassified

Estratégia De Tolerância A Falhas Para Um Conversor Delta-Chb Statcom Na Região De Sobremodulacão

Mendonca¹,

Cupertino²,

Pereira³

et al. 2020

Eletrônica de Potência

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“…Jing et al considered the correlation of sub-modules, analyzed the influence of different sub-module redundancy configuration schemes on the reliability of MMC, and finally obtained the joint probability distribution function of the converter arms [6]. Li et al considered the operating conditions of the converter valve, established a reliability model of the MMC valve based on the fault tree analysis method, and identified the weak links of the MMC valve [7]. Rong et al deduced the analytical expressions of the loss rate, power supply reliability, and redundancy of the full-bridge MMC converter valve.…”

Section: Introductionmentioning

confidence: 99%

“…The aforementioned study did not consider bypass switch refusal closing as a critical factor [4][5][6][7][8][9][10]. The VSC valve sub-module only needs to close the bypass switch when there is a fault, but if the bypass switch cannot be closed for some reason, the converter valve needs to be blocked to avoid expanding the fault range.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Reliability Constraint Analysis of MMC Valve

Wang,

Chen,

et al. 2023

J. Phys.: Conf. Ser.

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The VSC-converter valve is the core equipment of the VSC-HVDC transmission system, and its reliability directly affects the availability of the VSC-HVDC system. The reliability model of the existing VSC-converter valve mainly considers the relationship between different redundancy and the reliability of the VSC-converter valve. This paper first analyzes the impact of the failure of key components of the VSC-converter valve. According to the different effects, the arm reliability model of the VSC-converter valve is established, and finally, the comprehensive reliability model of the VSC-converter valve is established. Then, based on the model of the VSC-converter valve, the reliability constraints of the VSC-converter valve that meet the engineering requirements are finally derived. An example is given to verify the correctness of the classification reliability evaluation. Finally, according to the reliability model proposed in this paper, the design recommendations for a highly reliable VSC converter valve are given.

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“…Therefore, they play an essential role in the operation of the MMCs and have to be extremely reliable. In all types of capacitors, due to features like self-healing, excellent ripple current performance, and low equivalent series resistance [2]- [4], metalized polypropylene film (MPPF) capacitors are typically used in MMC applications. Although MPPF capacitors can provide better reliability performance, they are not failure-free.…”

Section: Introductionmentioning

confidence: 99%

Capacitor Condition Monitoring Based on the DC-Side Start-Up of Modular Multilevel Converters

Wang

Zhang

Wang

et al. 2020

IEEE Trans. Power Electron.

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This paper proposes a new sub-module capacitor condition monitoring method for modular multilevel converters (MMCs) based on the DC-side start-up procedure. During this process, the MMC can be simplified into an RC charging circuit, and the sub-module capacitance can be estimated by investigating its relationship with the phase current and sub-module voltage. Several practical issues related to the implementation, advantages, and limitations of the proposed method are presented as well. In order to validate the method, a series of experiments with different sub-module capacitances are conducted based on a three-phase MMC platform. Experimental results confirm the effectiveness and feasibility of the proposed method.

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Reliability modelling and analysis on MMC for VSC‐HVDC by considering the press‐pack IGBT and capacitors failure

Cited by 7 publications

References 4 publications

Estratégia De Tolerância A Falhas Para Um Conversor Delta-Chb Statcom Na Região De Sobremodulacão

Estratégia De Tolerância A Falhas Para Um Conversor Delta-Chb Statcom Na Região De Sobremodulacão

Modeling and Reliability Constraint Analysis of MMC Valve

Capacitor Condition Monitoring Based on the DC-Side Start-Up of Modular Multilevel Converters

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