Comprehensive understanding of DC pole‐to‐pole fault and its protection for modular multilevel converters

Yang, Xiaofeng; Xue, Yusheng; Wen, Piao; Li, Zejie

doi:10.1049/hve.2018.5045

Cited by 16 publications

(16 citation statements)

References 30 publications

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“…In practical application, the MMC would be blocked after the detection of dc side fault. Therefore, analysis of the transient response of dc side fault is based on the blocking of MMC [21,[41][42][43][44][45]. In [15], before the MMC is blocked, the ac current contributes to the dc side.…”

Section: Ptp Faultmentioning

confidence: 99%

Review on topology‐based dc short‐circuit fault ride‐through strategies for MMC‐based HVDC system

Wan

Mao

Zhou

et al. 2020

IET Power Electronics

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Modular multilevel converter (MMC) based high-voltage direct-current (HVDC) transmission system is a promising solution to the bulk power transmission over a long distance, especially for renewable energy integration. However, conventional half-bridge submodules MMC topology is susceptible to dc faults. In this study, dc short-circuit fault analysis and a review on recent advances in clearing dc fault current utilising different topologies are presented. Furthermore, the MMC can also work as a static synchronous compensator, producing reactive power to support the grid and improving the stability of the system when dc fault occurs. Finally, the comparison for different topologies in terms of device cost, estimated power losses, dc fault ridethrough capability, and reactive power compensation capability is given.

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Section: Ptp Faultmentioning

confidence: 99%

Review on topology‐based dc short‐circuit fault ride‐through strategies for MMC‐based HVDC system

Wan

Mao

Zhou

et al. 2020

IET Power Electronics

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show abstract

“…Generally, VSCs are vulnerable to dc pole-to-pole (PTP), poleto-ground and broken-line faults. As the most serious failure condition, a typical PTP fault is taken for a dc fault spread mechanism study [32], [33]. Figure 2 illustrates an equivalent three-phase VSC-HVDC PTP fault circuit diagram and the progressing fault stages.…”

Section: A Different Fault Stagesmentioning

confidence: 99%

Inductive Fault Current Limiters in VSC-HVDC Systems: A Review

et al. 2020

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Fast emerging fault current levels in high voltage direct current (HVDC) systems has always been a significant obstacle to building a safer and more reliable grid. Inductive fault current limiters (FCLs), compared with its resistive counterpart, are very effective in restricting the fault rising speed that causes major damage during the whole fault process. In this study, a comprehensive review of the methods used for building inductive type FCLs in HVDC systems is presented. The fault current characteristics of the modern HVDC system is discussed to obtain the basic requirements for the FCL. On the basis of different technological domains, various inductive-type FCL topologies and devices are well categorized and analyzed. After the overall discussion and comparison, representative works, as well as new progress and future prospects, are conveyed in detail. One may find the content of this study helpful as a detailed literature review or a practical technical guidance of this field.

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“…However, assuming, for example, the proposed three-phase buck-boost DAB-MMC is used, the transformer ratio can be reduced by a factor of four to n/4 : 1, due to the higher V dc1 : V dc2 gain indicated by Equation (8). Hence, the peak ac current will be four times smaller than Equation (12) and is given by Equation ( 14)Î…”

Section: Transformer Winding Current Analysismentioning

confidence: 99%

Exploiting buck–boost duality in dual active bridge modular multilevel converters to achieve high DC step ratios

et al. 2020

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A previously unidentified duality between buck and boost configured dc-ac modular multilevel converters (MMCs) is firstly revealed. Armed with this insight, a new dualactive-bridge (DAB)-MMC is proposed for high-voltage dc (HVDC)-to-medium-voltage dc (MVDC) power conversion that utilizes cascaded buck and boost dc-ac stages to obtain high dc step ratios. Single-phase and three-phase variants are presented. When compared with the conventional DAB-MMC solution for the same dc step ratio, both the single-phase and three-phase topologies offer reduced MVDC side transformer winding current stresses, while the three-phase topology also yields reduced MVDC side MMC submodule current stresses. The former is achieved by having the freedom to design the transformer with a lower turns ratio, and the latter is achieved due to the inherent paralleling of submodules on the MVDC side of the converter. Analysis of the three-phase topology reveals its low-voltage side transformer winding current stresses can be reduced by a factor of 3.27. A generalized mathematical model of the proposed buck-boost DAB-MMC is derived and used to propose a dynamic controller for both the single-phase and three-phase topologies. Real-time simulations obtained from a real-time digital simulator system that incorporates an FPGA-based controller for the valve firing controls validate the proposed buck-boost DAB-MMC operation and dynamic controls.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Comprehensive understanding of DC pole‐to‐pole fault and its protection for modular multilevel converters

Cited by 16 publications

References 30 publications

Review on topology‐based dc short‐circuit fault ride‐through strategies for MMC‐based HVDC system

Review on topology‐based dc short‐circuit fault ride‐through strategies for MMC‐based HVDC system

Inductive Fault Current Limiters in VSC-HVDC Systems: A Review

Exploiting buck–boost duality in dual active bridge modular multilevel converters to achieve high DC step ratios

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