Pole‐to‐ground fault ride through strategy for half‐/full‐bridge hybrid MMC‐based radial multi‐terminal HVDC systems with low‐impedance grounded

Lin, Lei; He, Zhen; Hu, Jiabing; He, Zhiyuan; Xu, Kecheng

doi:10.1049/iet-gtd.2017.0580

Cited by 25 publications

(15 citation statements)

References 24 publications

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“…To avoid these hazards, understanding the transient behaviour of the dc fault current during the FRT stage is crucial [11]. Considering that pole-to-ground (PTG) fault is the most common dc fault [3,4], and symmetrical bipolar is the most typical configuration in HVDC system [12,13], this work will concentrate on the symmetrical bipolar-based hybrid MMC, and analyse the transient behaviour of the dc fault current during the PTG FRT stage.…”

Section: Introductionmentioning

confidence: 99%

Modelling and analysis of half‐/full‐bridge hybrid MMC when riding through DC‐side pole‐to‐ground fault

Lin

et al. 2021

High Voltage

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In a modular multilevel converter-based high-voltage direct current (MMC-HVDC) system, the dc fault ride through (FRT) control is an effective way to deal with a dc-side pole-to-ground (PTG) fault. However, the setting of FRT duration brings potential hazards: 1) MMC will face the risk of "secondary short circuit" if FRT duration is short; 2) ac grid may have power angle stability issue if FRT duration is long. To avoid these hazards and provide theoretical guidance for the FRT duration setting, transient behaviour of dc fault current during the PTG FRT stage is explored in this work. Firstly, challenges of the transient analysis are summarised as non-linearity and high-order issues. In light of this, numerical and Hilbert-Huang Transformation methods are introduced to evaluate the non-linearity issue. It is found that the path of MMC from dc current to dc internal voltage is weakly nonlinear. Hence, a linear transient model is built to analyse the dc fault current. By participation factor analysis, the order of the proposed model is further reduced, so that an analytical expression of the dc fault current is approximately derived. Based on the analytical expression, regularities and mechanism of dc fault current are fully revealed. Application of the transient analysis to the setting of FRT duration is elaborated in detail. Finally, the PSCAD/EMTDC simulation verifies the validity of the proposed model and analytical expression.

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Section: Introductionmentioning

confidence: 99%

Modelling and analysis of half‐/full‐bridge hybrid MMC when riding through DC‐side pole‐to‐ground fault

Lin

et al. 2021

High Voltage

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“…Modular multilevel converters (MMCs) constitute an important new energy delivery mechanism owing to their strong scalability, low harmonic content, and the ability to provide reactive power support [1]. When compared with a two-terminal system, a multi-terminal HVDC can realise multiple power supplies and multiple drop-point power reception with better flexibility, cost effectiveness, and stability, thereby enhancing its application prospects [2]. Furthermore, the transmission mode of an inland overhead line rises gradually with the increasing voltage level and transmission capacity of the flexible DC system, progressing towards multi-terminal networking [3].…”

Section: Introductionmentioning

confidence: 99%

A multiport superconducting fault‐current‐limiting circuit breaker for a flexible DC power grid

Wang

et al. 2021

IET Energy Syst Integration

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The fault current of the high-voltage and large-capacity flexible DC power grid has the characteristics of a fast rising rate, high peak value, and large influence area; therefore, fault current suppression equipment suitable for the flexible DC power grid has become a research hotspot. First, the fault mechanism and fault current calculation associated with the DC converter are analysed in this study; subsequently, a multiport superconducting fault-current-limiting circuit breaker (SFCLCB) suitable for a flexible DC power grid is designed. The circuit breaker adopts ground drainage to transfer the fault current. It only needs to be equipped with a single-way conduction power electronic switch group and the number of switches is not affected by the number of DC lines, considerably improving the cost effectiveness of the equipment. In addition, the workflow and current-limiting principle of SFCLCB are analysed, and the optimal matching method is determined with respect to the resistance of the superconducting current limiter and the power electronic devices of the main circuit breaker. Afterwards, the four-terminal flexible DC transmission simulation system is observed to exhibit high efficiency in suppressing the fault current and high cost effectiveness based on comparative simulations. Finally, its engineering applicability is verified by the digital physical and hybrid simulation platform.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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“…Generally, dc short-circuit faults in MMC-HVDC overhead transmission system can be divided into two types: pole-to-pole (PTP) fault and pole-to-ground (PTG) fault [9][10][11][12]. When PTG fault occurs, the PTG voltage of the healthy pole would be increased to twice the rated value and the phase-to-ground voltages in the ac side would get offset, causing a severe offset voltage between neutral point and ground [13,14].…”

Section: Introductionmentioning

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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Pole‐to‐ground fault ride through strategy for half‐/full‐bridge hybrid MMC‐based radial multi‐terminal HVDC systems with low‐impedance grounded

Cited by 25 publications

References 24 publications

Modelling and analysis of half‐/full‐bridge hybrid MMC when riding through DC‐side pole‐to‐ground fault

Modelling and analysis of half‐/full‐bridge hybrid MMC when riding through DC‐side pole‐to‐ground fault

A multiport superconducting fault‐current‐limiting circuit breaker for a flexible DC power grid

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

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