Analysis Methodology for Differential Mode Interference in Energy Supply System of Hybrid DC Breaker

Cui, Xiang; Li, Ying; Liu, Yuan; Zhang, Sheng; Ji, Bing; Qi, Lei; Zhang, Keke

doi:10.1109/temc.2019.2952247

Cited by 16 publications

(9 citation statements)

References 16 publications

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“…When the capacitor voltage exceeds the MOV action voltage, the fault current will transfer to the energy absorber branch. The current change rate of stage VI will reach kA/ms level, which is also called the second current transfer process, and its current can be expressed by Equation ( 13)- (15).…”

Section: Mechanism and Characterisation Of Current Generationmentioning

confidence: 99%

“…For DC circuit breaker, the problems in electromagnetic transient process and electrical stress are mainly concerned [13,14]. X. Cui and others analysed the mechanism of differential mode interference in the HCB power supply system, established the broadband equivalent circuit model of the power supply system, and proposed the suppression measures [15]. Because of the short operation time of HCB, there is no literature on the transient MF disturbance at the DCU, and there is no measurement data of the internal magnetic field.…”

Section: Introductionmentioning

confidence: 99%

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Analysis for magnetic field disturbance of hybrid DC circuit breaker during breaking

Shen

et al. 2021

High Voltage

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The high current of hybrid DC circuit breaker (HCB) in the process of breaking generates strong transient magnetic field (MF), which may interfere with the normal operation of driver control units (DCUs). Therefore, the analysis for transient MF disturbance is of great significance. Due to the large space scale of HCB, with the large number of power electronic devices, the numerical calculation method has the disadvantages of large consumption of resources and slow calculation speed in solving the transient MF inside the HCB. In this study, the current generation mechanism of a 500 kV HCB is analysed, and the equivalent current path is obtained by considering the skin effect. Combined with the temporal and spatial distribution of transient current, the multi-process transient equivalent model of transient MF calculation is established, and the model has the advantages of high precision and high speed. Then, the breaking experiment of HCB is carried out, and the transient MF near the DCU is measured. The experiment results verify the validity of the model. Furthermore, the disturbance of transient MF at the DCU of the transfer branch during breaking 25 kA current is analysed.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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Section: Mechanism and Characterisation Of Current Generationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis for magnetic field disturbance of hybrid DC circuit breaker during breaking

Shen

et al. 2021

High Voltage

Self Cite

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“…Moreover, the primary and secondary equipment in the high-voltage DCCB is highly integrated [9,10], and the CMD can easily transform into sensitive ports' interference of DCCB through capacitive and inductive coupling or radiation [11], as shown in Figure 1. These differential-mode interferences may cause misjudgement of DCCB protection.…”

Section: Introductionmentioning

confidence: 99%

Analysis and suppression of voltage oscillation at DC circuit breaker terminal in DC fault transient process

Shen

Huang

et al. 2022

High Voltage

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High‐frequency voltage oscillation occurs at the initial stage of DC short‐circuit fault in the modular multilevel converter (MMC)‐based high‐voltage direct‐current systems, which directly threatens the reliable operation of the secondary equipment in DC circuit breakers (DCCBs). Therefore, this paper focusses on the voltage oscillation characteristic at DCCB terminals, considered the stray parameters of connecting lines, the parasitic parameters of main equipment and the impedance of grounding grid, established equivalent circuit models of MMC‐HVDC converter station at the initial stage of pole‐to‐pole and pole‐to‐ground fault, and obtained the analytical formula for the voltage oscillation frequency. Then, the comparison with the DC short‐circuit test data of ±200 kV MMC‐HVDC converter station verified the validity of the models and revealed the mechanism of voltage oscillation. Finally, the influence of the parameters of the converter station on the oscillation characteristics was discussed. It was proposed to install the DCCB at the MMC valve's terminal near the DC side, and the oscillation frequency is about 10–60 kHz, which is more than 5 times lower than that at the DC reactor's terminal near the DC pole bus, and the disturbance of oscillation to DCCB was alleviated.

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“…The research and implementation of the former have been relatively mature, while the latter remains an open problem. How to solve the problem of identification of unknown protocols has been an important difficulty in the field of network security [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

An Unknown Protocol Identification Method for Industrial Internet

Zhu

Jiang

Zhang

et al. 2022

Wireless Communications and Mobile Computing

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This paper focuses on the problem of protocol identification in the industrial internet and proposes an unknown protocol identification method. We first establish an industrial internet protocol detection model to classify known protocols, unknown protocols, and interference signals and then store the unknown protocols for manual analysis. Based on the Eps-neighborhood idea, we further develop an Eps-neighborhood hit algorithm and propose an identification method to identify unknown protocols, where the supervised learning classification of unknown protocol detection is realized. Finally, extensive experimental results are provided to illustrate our theoretical findings. It indicates that the proposed method has an average screening accuracy of 94.675% and 95.159% for unknown protocols encoded in binary and ASCII, respectively, while the average screening accuracy of known protocols in binary and ASCII encoding is 94.242% and 94.075%.

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Analysis Methodology for Differential Mode Interference in Energy Supply System of Hybrid DC Breaker

Cited by 16 publications

References 16 publications

Analysis for magnetic field disturbance of hybrid DC circuit breaker during breaking

Analysis for magnetic field disturbance of hybrid DC circuit breaker during breaking

Analysis and suppression of voltage oscillation at DC circuit breaker terminal in DC fault transient process

An Unknown Protocol Identification Method for Industrial Internet

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