Actively Controllable Switching for Tree Topology Seafloor Observation Networks

Chen, Yanhu; Howe, Bruce M.; Yang, Canjun

doi:10.1109/joe.2014.2362830

Cited by 20 publications

(9 citation statements)

References 21 publications

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“…At present, the mainstream international submarine cabled power supply technology uses direct current power supply, and there are two types, i.e., the constant voltage system and the constant current system, each system having its own advantages and disadvantages. For constant voltage power supply systems, the power converter module is connected in parallel with the trunk cable, and the power can be easily distributed through a mesh network [12], as with the North East Pacific Time-Integrated Undersea Networked Experiments (NEPTUNE-Canada) [13,14] and other operating systems [15,16]. For constant current power supply systems, a high-frequency switching converter is needed to shunt the primary node current on the trunk cable, keep the current in the trunk cable constant, and provide a constant current for the secondary node [11,17], as with Japan 's Dense Ocean Network for Earthquakes and Tsunamis (DONET) [18,19].…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of an Equivalent Load Power-Stability Control Circuit for Cabled Underwater Information Networks

2020

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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 stability of the remote power supply system, a key component of underwater power facilities, is essential. To avoid instability and collapse of the power system caused by rapid changes in load, we propose an equivalent load power-stability control circuit suited for an underwater constant current power supply system. This circuit can change its own working state according to the size of the load and play a role in power compensation. In order to prove the feasibility of the converter design, the working state of the circuit under different load values was analyzed and the performance of circuit was verified through simulation and experiments. The results show that when the load resistance changes within a large range (including when the load has an open circuit or short circuit fault), the equivalent load is basically unchanged or changed within a very small range for the constant current source, causing the constant current source to maintain stable output voltage and output power. Thus, the influence of the branch line cable on the trunk line cable is reduced, and the reliability of the underwater constant current power supply system is improved. Furthermore, the equivalent load power-stability control circuit would facilitate live equipment replacement and maintenance for CUINs. INDEX TERMS Cabled underwater information networks (CUINs), remote constant current power supply system, stability, equivalent load power-stability control.

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Section: Introductionmentioning

confidence: 99%

Design and Analysis of an Equivalent Load Power-Stability Control Circuit for Cabled Underwater Information Networks

2020

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“…Currently, there are two major types of power supply systems used internationally and both are direct current (DC). In the first type, the trunk cable operates at a nominally constant voltage (CV) [15] and all nodes are parallel connected using seawater as a return; some examples of these systems are the North East Pacific Time-Integrated Undersea Networked Experiments (NEPTUNE-Canada) [16], [17] and other operating systems [18], [19]. In the second type, the trunk cable operates in a constant current (CC) mode [14].…”

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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“…Currently, there are two major types of power supply system in use internationally and both are direct current (DC). In the first type, the trunk cable operates at a nominally constant voltage (CV) [11] and all nodes are parallel connected using seawater as a return; example systems are the North East Pacific Time-Integrated Undersea Networked Experiments (NEPTUNE-Canada) [12], [13] and other operating systems [14], [15]. In the second type, the trunk cable operates in a constant current (CC) mode [10].…”

Section: Introductionmentioning

confidence: 99%

“…In the light of FDID strategy in self-validating multifunctional sensors, by using the squared prediction error (SPE) statistic, the sparse non-negative matrix factorization-based method can effectively detect faults, and the variables contribution plots based on SPE statistic can help to locate and isolate the faulty sensitive units [22]. Chen Y.et al proposed an actively controllable method which configures each branch link of the network [11] by changing the input current of the SPFE, and the constant voltage is employed to locate the system fault by using the measured voltage current and impedance method, and in this way, a relevant laboratory experimental prototype was designed. Lu S, Chan T et al proposed a method directed against the low/high impedance faults of the constant voltage remote power supply system in the NEPTUNE observation network [12], [23], by changing the polarity of the SPFE output voltage, the links for the power and communication in the branching unit (BU) are adjusted to control the interrupter switching to realize low-impedance fault location and isolation.…”

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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Actively Controllable Switching for Tree Topology Seafloor Observation Networks

Cited by 20 publications

References 21 publications

Design and Analysis of an Equivalent Load Power-Stability Control Circuit for Cabled Underwater Information Networks

Design and Analysis of an Equivalent Load Power-Stability Control Circuit for Cabled Underwater Information Networks

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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