An Accelerated Distance Protection of Transmission Lines Emanating From MMC-HVdc Stations

Liang, Yingyu; Huo, Yaotong; Zhao, Feng

doi:10.1109/jestpe.2021.3058154

Cited by 13 publications

(3 citation statements)

References 33 publications

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“…CT saturation can cause the measured differential current to (1) Frequency-Domain based scheme [7][8][9]14] The fault behaviors of MMC are considered. Thus, they can operate well in the presence of MMC-HVDC stations Inherent demerits of frequency-domain based scheme include the requirement of discrete Fourier transform, the negative effect of decaying DC component on accuracy of phasor estimation Some of them have no natural phase selection capability [7][8][9] Time-Domain based scheme [10][11][12][13]15] Discrete Fourier transform is removed. They exhibit good operating speed and low complexity Some of them are not applicable to MMC-HVDC stations.…”

Section: Analysis Of Differential Current Waveformsmentioning

confidence: 99%

“…However, the proposed scheme cannot operate accurately under symmetrical faults. The authors in [8] propose a primary protection scheme based on improved distance protection and fiber-optic communication, which can operate correctly under all fault types. However, there are still some limitations, such as the inability to identify fault phases and slow operation in some cases.…”

Section: Introductionmentioning

confidence: 99%

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Current trajectory image-based protection algorithm for transmission lines connected to MMC-HVDC stations using CA-CNN

Liang

Ren

et al. 2023

Prot Control Mod Power Syst

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In the presence of an MMC-HVDC system, current differential protection (CDP) has the risk of failure in operation under an internal fault. In addition, CDP may also incur security issues in the presence of current transformer (CT) saturation and outliers. In this paper, a current trajectory image-based protection algorithm is proposed for AC lines connected to MMC-HVDC stations using a convolution neural network improved by a channel attention mechanism (CA-CNN). Taking the dual differential currents as two-dimensional coordinates of the moving point, the moving-point trajectories formed by differential currents have significant differences under internal and external faults. Therefore, internal faults can be identified using image recognition based on CA-CNN. This is improved by a channel attention mechanism, data augmentation, and adaptive learning rate. In comparison with other machine learning algorithms, the feature extraction ability and accuracy of CA-CNN are greatly improved. Various fault conditions like different network structures, operation modes, fault resistances, outliers, and current transformer saturation, are fully considered to verify the superiority of the proposed protection algorithm. The results confirm that the proposed current trajectory image-based protection algorithm has strong learning and generalizability, and can identify internal faults reliably.

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Section: Analysis Of Differential Current Waveformsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Current trajectory image-based protection algorithm for transmission lines connected to MMC-HVDC stations using CA-CNN

Liang

Ren

et al. 2023

Prot Control Mod Power Syst

Self Cite

View full text Add to dashboard Cite

show abstract

“…Each logical judgment process can be regarded as a relay, although these relays are not real and are called virtual relays. Using virtual relays can help better simulate the protection system and provide a more accurate description of the relay protection system's behavior [8].…”

Section: Introductionmentioning

confidence: 99%

A Summary of Relay Protection-based Simulation for Dynamic Performance and Reliability Assessment

2023

Int. J. Appl. Inf. Manag.

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As technology advances, electricity has become an essential aspect of both national security and daily life. Ensuring the safety of the power grid is thus of utmost importance. However, in China, research on relay protection models for dynamic simulation of power systems is still in its early stages. Due to this, the control laws of relay protection elements have not been well understood, leading to inadequate handling of system failures. To ensure the safe operation of power systems, it is crucial to first strengthen the grid structure of the power system. This can be achieved through the improvement of elasticity coefficient, reasonable distribution of reserve capacity, and the reinforcement of the adjustment ability of the tie line between major power grids. Additionally, improving the stable reserve of the power grid is essential. To improve the authenticity and reliability of dynamic simulation, it is necessary to establish a set of relay protection models that are consistent with actual relay protection. By doing so, the stability problem in the power system can be accurately analyzed, leading to improved reliability. In this study, a relay protection model was established that reduces the complexity of modeling and can accurately reflect the dynamic characteristics of the power system following interference. This model is significant to the analysis and research of power systems, as it can enhance the understanding of control laws for relay protection elements, leading to improved management of system failures and better overall reliability.

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Simplified Space Vector Modulation Algorithm for Modular Multilevel Converters

Zhao,

Wang,

Wang

et al. 2024

Lecture Notes in Electrical Engineering

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An Accelerated Distance Protection of Transmission Lines Emanating From MMC-HVdc Stations

Cited by 13 publications

References 33 publications

Current trajectory image-based protection algorithm for transmission lines connected to MMC-HVDC stations using CA-CNN

Current trajectory image-based protection algorithm for transmission lines connected to MMC-HVDC stations using CA-CNN

A Summary of Relay Protection-based Simulation for Dynamic Performance and Reliability Assessment

Simplified Space Vector Modulation Algorithm for Modular Multilevel Converters

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