An Active Node Switching Method Based on Discrete-Voltage Intervention for Seafloor Observation Network

Zhang, Zhifeng; Chen, Yanhu; Li, Dejun; Jin, Bo; Yan, Canjun; Xu, Feifei

doi:10.4031/mtsj.51.3.6

Cited by 4 publications

(4 citation statements)

References 19 publications

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“…Energy transmission plays a key role in long-term observatories. Hence, the observation platforms require a reliable and robust underwater electrical network that enables flexible node switch and partial operation during node failure or maintenance ( Zhang et al., 2017 ). There is difficulty for inspecting and repairing the equipment because of its location in the extreme environment, it is necessary to strengthen the management of electronic equipment control (e.g., heat dissipation) to extend its service period ( Toma et al., 2015 ).…”

Section: Development Of Deep-sea Equipmentmentioning

confidence: 99%

Role of deep-sea equipment in promoting the forefront of studies on life in extreme environments

et al. 2021

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Summary The deep-sea environment creates the largest ecosystem in the world with the largest biological community and extensive undiscovered biodiversity. Nevertheless, these ecosystems are far from well known. Deep-sea equipment is an indispensable approach to research life in extreme environments in the deep-sea environment because of the difficulty in obtaining access to these unique habitats. This work reviewed the historical development and the state-of-the-art of deep-sea equipment suitable for researching extreme ecosystems, to clarify the role of this equipment as a promoter for the progress of life in extreme environmental studies. Linkages of the developed deep-sea equipment and the discovered species are analyzed in this study. In addition, Equipment associated with researching the deep-sea ecosystems of hydrothermal vents, cold seeps, whale falls, seamounts, and oceanic trenches are introduced and analyzed in detail. To clarify the thrust and key points of the future promotion of life in extreme environmental studies, prospects and challenges related to observing equipment, samplers, laboratory simulation systems, and submersibles are proposed. Furthermore, a blueprint for the integration of in situ observations, sampling, controllable culture, manned experiments in underwater environments, and laboratory simulations is depicted for future studies.

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Section: Development Of Deep-sea Equipmentmentioning

confidence: 99%

Role of deep-sea equipment in promoting the forefront of studies on life in extreme environments

et al. 2021

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“…Substituting ( 35) into (34), we can obtain; ϕ cable = 2.1004 × 10 −6 i st + 6.5347 × 10 −9 i cu (36) i st = 0.25i cable and i cu = 0.75i cable are known, and i st and i cu is substituted into (36); ϕ cable = 5.3 × 10 −7 i cable (37) The distributed inductance per unit length of the cable is;…”

Section: Modeling Simulation and Analysis Of The Short-circuit Grounding High-impedance Fault Location For A Constant Current Remote Powementioning

confidence: 99%

“…According to the generalized Kirchhoff's current law (KCL), the method based on the leakage current error vector generated by the open-circuit fault in the constant voltage remote power supply system was proposed [36]. An active node fault switching and isolating method based on a discrete-voltage intervention is proposed and aimed at controlling a specific node inserted in or cut away from the whole underwater network [37]. Zheng S. et al proposed an HVDC power switching circuit for the BUs of CUINs based on the voltage sharing scheme of the series-connected IGBTs [38].…”

Section: Introductionmentioning

confidence: 99%

A Novel Diagnosis and Location Method of Short-Circuit Grounding High-Impedance Fault for a Mesh Topology Constant Current Remote Power Supply System in Cabled Underwater Information Networks

et al. 2019

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Cabled underwater information networks (CUINs) have evolved over the last decade to provide abundant power and broad bandwidth communication to enable marine science. To ensure reliable operation of CUINs, it is essential to have the technology for high-impedance fault diagnosis and isolation with high reliability and accuracy. The short-circuit grounding high-impedance fault status of mesh topology constant current remote supply system was diagnosed by analyzing the variation difference of equivalent current in the Laplace transform domain. Shore power feeding equipment (SPFE) supplied the power for underwater system individually from both terminals, and the fault location was located by calculating the shunt loss of the current in the trunk before and after the fault. Thus, the fault was isolated to maintain normal operation of the rest of the system and improve the reliability of CUINs. According to the established typical mesh topology constant current remote supply system circuit model, the fault location scheme was designed to simulate the faults of the cable sections in the different links in the constant current remote supply system, and the changes of current located at the primary nodes (PNs) in the Laplace transform domain before and after the fault were analyzed. The results show that the equivalent current of each PN changes when a fault occurs in the system, and the location of the fault point can be analyzed by comparing the shunt loss of the current in the trunk before and after the fault. The designed method of short-circuit grounding high-impedance fault diagnosis and location for a constant current remote supply system is suitable for the fault monitoring and judgment of CUINs with high feasibility and practicality. Furthermore, it provides technical support for the resulting effective determination of faults, isolation of faults, protection of equipment, and improvement of the system reliability.INDEX TERMS Cabled underwater information networks (CUINs), constant current, short-circuit grounding high-impedance fault, fault diagnosis, point location, reliability.

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“…According to generalized Kirchhoff's current law, the method based on the leakage current error vector generated by high-impedance fault in the constant voltage remote power supply system was proposed [27]. An active node fault switching and isolating method based on discrete-voltage intervention is proposed aimed at controlling a specific node inserted in or cut away from the whole underwater network [28]. Shaoduo Zheng, and Feng Lyu proposed an HVDC power switching circuit for the BUs of CUINs, based on the voltage sharing scheme of series-connected IGBTs [29].…”

Section: Introductionmentioning

confidence: 99%

Research on High-Impedance Fault Diagnosis and Location Method for Mesh Topology Constant Current Remote Power Supply System in Cabled Underwater Information Networks

et al. 2019

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Cabled underwater information networks (CUINs) have evolved over the last decade to provide abundant power and broad bandwidth communication to enable marine science. To ensure reliable operation of the CUINs, the technology for high-impedance fault diagnosis and isolation with high reliability and accuracy is essential. In this paper, we review diagnosis and location methods as applied to a constant voltage ring and the tree topology network. A high-impedance fault diagnosis method based on the variation of the sampling voltage in the primary nodes (PNs) for a constant current remote power supply system is proposed. The methods for analyzing the fault voltage with using power monitoring and control system (PMACS) and communications monitoring, control system (CMACS), and hybrid detection with alternating current and direct current are used for research the high-impedance fault location based on the designed fault isolation circuit. In particular, a verification scheme for high-impedance fault location is designed for the CUINs based on the classical mesh topology. Furthermore, high-impedance faults of nodes and submarine cable sections in the trunk cable are simulated, and the variations of leakage voltage are analyzed. By researching the change of leakage voltage before and after the fault occurs, the feasibility and practicability of the diagnosis and location scheme are verified. INDEX TERMS Cabled underwater information networks (CUINs), constant current remote power supply system, high-impedance fault, mesh topology, diagnosis and location.

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An Active Node Switching Method Based on Discrete-Voltage Intervention for Seafloor Observation Network

Cited by 4 publications

References 19 publications

Role of deep-sea equipment in promoting the forefront of studies on life in extreme environments

Role of deep-sea equipment in promoting the forefront of studies on life in extreme environments

A Novel Diagnosis and Location Method of Short-Circuit Grounding High-Impedance Fault for a Mesh Topology Constant Current Remote Power Supply System in Cabled Underwater Information Networks

Research on High-Impedance Fault Diagnosis and Location Method for Mesh Topology Constant Current Remote Power Supply System in Cabled Underwater Information Networks

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