Research on single-ended protection principle of LCC-VSC three-terminal DC transmission line

Zhang, Dahai; Wu, Chuanjian; He, Jinghan; Luo, Guangzhao

doi:10.1016/j.ijepes.2021.107512

Cited by 11 publications

(9 citation statements)

References 16 publications

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“…Combined with the fault circuit downstream of the fault branch, U x and I x can be further expressed as: Since the remote system's fault current is limited to 0, it can be equivalent to an open circuit. Therefore, the fault circuit downstream of the fault branch can be expressed as: (8) The corresponding voltage U xn and current I xn at x n can be expressed as:…”

Section: Temporary Faultmentioning

confidence: 99%

“…The fault circuit is equivalent to the distributed parameter model, and the fault distance is solved by (13). U x and I x (30) denote the electrical quantity of positive or negative pole, which need to be decoupled in (8) as:…”

Section: The Process Of the Proposed Schemementioning

confidence: 99%

“…Permanent PTP faults are selected for simulation. In combination with the selection of current-limiting reactors (CLR) values in the literature [3,[6][7][8][9], the CLR values at the LCC side are set to 100 mH, 200 mH, and 300 mH, respectively, while the CLR values at the MMC side are set to 10 mH, 50 mH, and 100 mH, respectively. The fault locations are set as f 1-30 and f 1-470 .…”

Section: Performance Of Noise Interferencementioning

confidence: 99%

“…Currently, the protection principles of the hybrid multi-terminal HVDC grid mainly focus on single-ended protection [6][7][8][9] and pilot protection [3,[10][11][12]. Generally, the single-end protection principle of the hybrid multi-terminal DC transmission system depends on wavefront identification, and its performance is closely related to the sampling rate, wavefront calibration, DC boundary, fault locations, etc., and requires further development.…”

Section: Introductionmentioning

confidence: 99%

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Fault identification scheme for protection and adaptive reclosing in a hybrid multi-terminal HVDC system

Hou

Song

Fan

2023

Prot Control Mod Power Syst

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A fault identification scheme for protection and adaptive reclosing is proposed for a hybrid multi-terminal HVDC system to increase the reliability of fault isolation and reclosing. By analyzing the "zero passing" characteristic of current at the local end during the converter capacitor discharge stage, the fault identification scheme is proposed. The distributed parameter-based fault location equation, which incorporates fault distance and fault impedance, is developed with the injection signal and the distributed parameter model during the adaptive reclosing stage. The fault distance is determined using a trust region reflection algorithm to identify the permanent fault, and a fault identification scheme for adaptive reclosing is developed. Simulation results show that the proposed scheme is suitable for long-distance transmission lines with strong anti-fault impedance and anti-interference performance. Also, it is less affected by communication delay and DC boundary strength than existing methods.

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Section: Temporary Faultmentioning

confidence: 99%

Section: The Process Of the Proposed Schemementioning

confidence: 99%

Section: Performance Of Noise Interferencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fault identification scheme for protection and adaptive reclosing in a hybrid multi-terminal HVDC system

Hou

Song

Fan

2023

Prot Control Mod Power Syst

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“…Nevertheless proposed time and frequency domain single end data-based schemes like current/voltage derivativebased [6,7], travelling wave based [8,9] and frequency domain based [10] have required high speed of operation. However, to achieve selectivity feature of the above-mentioned schemes, it is necessary to install boundary elements at the end of each DC line [11,12], which is not possible in case of DC distribution system due to the increased complexity of the system.…”

Section: Introductionmentioning

confidence: 99%

High speed protection of medium voltage DC distribution system using modified mathematical morphology

Shah

Bukhari

Imran

et al. 2022

IET Renewable Power Gen

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One of the challenging issues in the realization of medium-voltage DC (MVDC) distribution system is high-speed protection scheme design against quickly rising short circuit fault-DC current. This paper proposes a high-speed protection scheme based on the processing of energy signals through mathematical morphology (MM). The voltage and current signals measured at a distribution line section (DLS) are used to obtain the energy signal. The proposed scheme develops a modified MM-based filter to extract the transient information in the energy signal rapidly and distinctly in the form of positive/negative polarity. The polarity detection of any disturbance in the analysed energy signal indicates the occurrence of a sudden disturbance in the system. The sudden disturbance occurrence confirmation triggers the faulty DLS identification and classification algorithms of the proposed scheme. The faulty DLS identification and classification algorithms are based on the detected polarities of the energy signal. The protection scheme requires low bandwidth communication. The proposed protection scheme is evaluated by using a ±2.5 kV radial distribution network containing 4 feeders under different fault conditions in MAT-LAB/SIMULINK software. Simulation results verify that the proposed scheme can isolate the faulty portion within a few milliseconds after fault inception under a variety of fault cases.

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A reliable protection scheme for DC system with universal applicability

Zhang

et al. 2022

Electric Power Systems Research

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Research on single-ended protection principle of LCC-VSC three-terminal DC transmission line

Cited by 11 publications

References 16 publications

Fault identification scheme for protection and adaptive reclosing in a hybrid multi-terminal HVDC system

Fault identification scheme for protection and adaptive reclosing in a hybrid multi-terminal HVDC system

High speed protection of medium voltage DC distribution system using modified mathematical morphology

A reliable protection scheme for DC system with universal applicability

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