Current Suppression Method for DC Side Short Circuit Fault of MMC

Xin, Yechun; Yang, Yong; Wang, Weiru; Wang, Tuo; Xu, Guangjian; Dong, Qing

doi:10.1109/egrid48402.2019.9092659

Cited by 3 publications

(6 citation statements)

References 7 publications

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“…Δẋ = AΔx + BΔu dc (7) where Δx denotes the state variables vector. The order of the state-space model is determined by the order of the ARMA model in system identification.…”

Section: Index Of Damping Characteristicsmentioning

confidence: 99%

“…However, the internal dynamics of MMCs are ignored through the equivalent circuit methods, and the damping characteristics of the system cannot be displayed. The mainstream of the existing short-circuit current suppression methods for MMC-HVDC are optimising the MMC topology [6] and installing new current limiting devices [7]. The existing researches lack evaluation of the system damping and the short-circuit current to provide guidance for the planning and operation of MMC-HVDC transmission system.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Interaction between damping characteristics and the initial‐stage short‐circuit current of MMC‐HVDC transmission systems

Qin

Liu

Zhou

et al. 2021

IET Power Electronics

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This paper studies the interaction between the damping characteristics and the initial-stage short-circuit current of modular multilevel converter based high voltage direct current (MMC-HVDC) transmission system. First, the MMCs' input-output characteristics are obtained through the operator approach, and the influences of both linear part and nonlinear part are analysed. Second, an input-output characteristics based short-circuit current calculation method is proposed. Third, an eigenvalue-based comprehensive index is proposed to evaluate the damping characteristics of the MMC-HVDC transmission system. Finally, the interaction between the damping characteristics and the initial-stage DC shortcircuit current is analysed under different system parameters and DC system structures. The analysis results show that there is a negative correlation between the system damping characteristics and the average rising rate of the short-circuit current. The proposed index G can effectively evaluate the short-circuit current of MMC-HVDC and can provide guidance for the planning of DC system structure, the selection of operation mode and system parameters.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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“…Δẋ = AΔx + BΔu dc (7) where Δx denotes the state variables vector. The order of the state-space model is determined by the order of the ARMA model in system identification.…”

Section: Index Of Damping Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Interaction between damping characteristics and the initial‐stage short‐circuit current of MMC‐HVDC transmission systems

Qin

Liu

Zhou

et al. 2021

IET Power Electronics

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show abstract

“…Although many researches have investigated the topologies and application of current limiting devices, it is still not a perfect method for suppressing the DC short-circuit current. Due to the difficulty in manufacturing and high cost, there is no suitable DC fault current limiting devices for widely application [58]. The full use of converters' own capability through properly designed control strategies has become a prioritized choice, and it has been widely adopted in scenarios, such as DFIGs [59].…”

Section: Fault Current Suppression Control Strategymentioning

confidence: 99%

“…However, the above two methods need hybrid MMC and it is still not available for the most widely applied HB-MMC. A DC short circuit current suppression method that is based on bridge arm voltage control is designed in [58]. It is found that the rising rate of the short circuit current is proportional to the number of sub-modules participating in the discharge that can be reduced through reducing the DC component in the reference voltage in the bridge arm after fault.…”

Section: Fault Current Suppression Control Strategymentioning

confidence: 99%

“…With the DC and AC component of the compensated bridge arm reduced simultaneously, the output DC voltage is further reduced and the fault current is suppressed. The proposed current limiting measure is applied to a double-terminal MMC-HVDC system in [58]. Figure 19 shows the comparison of DC short circuit current with/without a current limiting measure.…”

Section: Fault Current Suppression Control Strategymentioning

confidence: 99%

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Review on Short-circuit Current Analysis and Suppression Techniques for MMC-HVDC Transmission Systems

et al. 2020

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The modular multilevel converter (MMC) has been widely adopted in high voltage direct current (HVDC) transmission systems due to its significant advantages. MMC-HVDC is developing towards multi-terminal direct current (MTDC) power grid for reliability enhancement. However, there exist a huge amplitude and a steep rise in fault current due to the low impedances of DC lines and MMCs, which threaten the security and reliability of the DC power grids. It is necessary to restrain the DC short circuit current in order to ensure the safe and stable operation of DC power grids. This paper gives a comprehensive review and evaluation of the proposed DC short-circuit current analysis and suppression techniques used in MMC-based MTDC power girds, in terms of MMC modeling, short circuit calculation, and suppression method. In addition, future trends of countermeasures to short circuit current in MMC-based MTDC power grids are also discussed.

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Impact of System Inherent Characteristics on Initial-Stage Short-Circuit Current of MMC-Based MTDC Transmission Systems

Qin

Liu

et al. 2022

IEEE Trans. Power Syst.

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Current Suppression Method for DC Side Short Circuit Fault of MMC

Cited by 3 publications

References 7 publications

Interaction between damping characteristics and the initial‐stage short‐circuit current of MMC‐HVDC transmission systems

Interaction between damping characteristics and the initial‐stage short‐circuit current of MMC‐HVDC transmission systems

Review on Short-circuit Current Analysis and Suppression Techniques for MMC-HVDC Transmission Systems

Impact of System Inherent Characteristics on Initial-Stage Short-Circuit Current of MMC-Based MTDC Transmission Systems

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