Research of UHV DC Transmission Based on the Current Control

2011 ◽  
Vol 143-144 ◽  
pp. 19-23
Author(s):  
Hai Long Zhao ◽  
Zhong Ying Lin
Keyword(s):  
Transmission System ◽  
Current Control ◽  
Good Effect ◽  
Submarine Cable ◽  
Long Distance ◽  
Harmonic Control ◽  
Dc Power ◽  
Current Transmission ◽  
Simulation Results ◽  
Time Type

Compared with AC (alternating current) transmission, DC(direct current) transmission has obvious superiority at high power, long distance, submarine cable transmission and asynchronous interconnected between exchange systems etc.. This paper constructed a kind of 12 pulse bridge UHV DC transmission system that includes control protection function through MATLAB/Simulink tool. By setting the breaker parameters, this paper studied the 12 pulse bridge UHV DC transmission system AC/DC side in case of setting down time, type and cleared. The simulation results demonstrate that this system has a good effect in harmonic control and it has no power compensations in realizing HV DC process, and it can completely work as an important reference in constructing HV DC power grid.

Performance testing of a long distance radial static VAr compensated transmission system and validation of simulation results

1988 ◽  
Vol 3 (4) ◽  
pp. 1509-1517 ◽  
Author(s):  
S.S. Choi ◽  
J.R. Stewart ◽  
B. Singh ◽  
P.F. Carrington ◽  
E.H. Goddard ◽  
...  
Keyword(s):  
Performance Testing ◽  
Transmission System ◽  
Long Distance ◽  
Simulation Results

scholarly journals Non-characteristic Harmonic Analysis of Uhv ac/dc Systems

2019 ◽  
Vol 260 ◽  
pp. 02011
Author(s):  
Jie Gong ◽  
Lixing Zhou ◽  
Lawu Zhou ◽  
Mengdi Zhou
Keyword(s):  
Direct Current ◽  
Power Transmission ◽  
Transmission System ◽  
Operating Conditions ◽  
Operation Condition ◽  
Long Distance ◽  
Current Transmission ◽  
Pulse Converter ◽  
Actual Operation ◽  
Grid Side

Uhv direct current transmission has developed rapidly in China due to its unique advantages of large capacity, long distance and high voltage. A series of researches have been carried out on the non-characteristic harmonic current in the grid side of uhv dc transmission system. This paper is aimed at the analysis of non-characteristic harmonics in the uhv direct current transmission system using a 12-pulse converter. Under ideal operating conditions, the system has characteristic non-characteristic harmonics. However, the actual operation condition of HVDC project is not ideal, so there are non-characteristic harmonics. The Simulink of MATLAB is used to model a uhv dc power transmission system. Based on this model, dynamic simulation is carried out to analyze the steady-state and dynamic characteristics of the system. Meanwhile, several common faults in the system are simulated. The simulation result is the same as the actual phenomenon, which provides support for identification, control and fault diagnosis of uhv ac/dc transmission system in the future.

scholarly journals Large-Signal Stability Analysis of the Undersea Direct Current Power System for Scientific Cabled Seafloor Observatories

2019 ◽  
Vol 9 (15) ◽  
pp. 3149
Author(s):  
Yamei Jiang ◽  
Feng Lyu
Keyword(s):  
Computer Simulation ◽  
Power System ◽  
Direct Current ◽  
Stability Criterion ◽  
Submarine Cable ◽  
Large Signal ◽  
Long Distance ◽  
Signal Stability ◽  
Dc Power ◽  
Submarine Cables

A large number of power electronic converters and long-distance submarine cables are an important part of the undersea direct current (DC) power system of the scientific cabled seafloor observatories (CSOs). However, the constant power load (CPL) characteristics of the converters and the distributed parameter characteristics of long-distance submarine cables greatly affect the stability of the CSO DC power system. This paper analyzes the large-signal stability of the CSO DC power system, and the equivalent circuits of long-distance submarine cables are established by theoretical analysis and computer simulation. A simplified computer simulation model and an equivalent experimental prototype model of a single-node CSO DC power system was built in the laboratory to study this issue. The mixed potential function method is used to analyze the large-signal stability of the CSO DC power system, and the large-signal stability criterion is obtained theoretically. The validity of the large-signal stability criterion is proved by simulations and experiments. The conclusion is that reducing the inductance of the submarine cable, increasing the capacitance of the submarine cable, increasing the output voltage of the shore station power feeding equipment (PFE) or reducing the power consumption of the undersea station, are beneficial to improve the large-signal stability of the CSO DC power system.

scholarly journals Spin current distribution in antiferromagnetic zigzag graphene nanoribbons under transverse electric fields

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jie Zhang ◽  
Eric P. Fahrenthold
Keyword(s):  
Electric Fields ◽  
Transverse Electric ◽  
Graphene Nanoribbons ◽  
Spin Current ◽  
Differential Resistance ◽  
Current Control ◽  
Field Analysis ◽  
Current Transmission ◽  
Transverse Electric Fields ◽  
Zigzag Graphene Nanoribbons

AbstractThe spin current transmission properties of narrow zigzag graphene nanoribbons (zGNRs) have been the focus of much computational research, investigating the potential application of zGNRs in spintronic devices. Doping, fuctionalization, edge modification, and external electric fields have been studied as methods for spin current control, and the performance of zGNRs initialized in both ferromagnetic and antiferromagnetic spin states has been modeled. Recent work has shown that precise fabrication of narrow zGNRs is possible, and has addressed long debated questions on their magnetic order and stability. This work has revived interest in the application of antiferromagnetic zGNR configurations in spintronics. A general ab initio analysis of narrow antiferromagnetic zGNR performance under a combination of bias voltage and transverse electric field loading shows that their current transmission characteristics differ sharply from those of their ferromagnetic counterparts. At relatively modest field strengths, both majority and minority spin currents react strongly to the applied field. Analysis of band gaps and current transmission pathways explains the presence of negative differential resistance effects and the development of spatially periodic electron transport structures in these nanoribbons.

scholarly journals Heat Leak Measurement of the 200 m Superconducting DC Power Transmission System at Chubu University

2012 ◽  
Vol 36 ◽  
pp. 1366-1371 ◽  
Author(s):  
Hirofumi Watanabe ◽  
Yury Ivanov ◽  
Jian Sun ◽  
Makoto Hamabe ◽  
Toshio Kawahara ◽  
...  
Keyword(s):  
Power Transmission ◽  
Transmission System ◽  
Heat Leak ◽  
Dc Power ◽  
Power Transmission System ◽  
Dc Power Transmission

Modeling and Simulation of Electric Drive Bulldozer Based on the Torque Control

2013 ◽  
Vol 310 ◽  
pp. 236-239 ◽  
Author(s):  
Zhi Chao Zhou ◽  
Xiao Ling Chen ◽  
Yuan Zou
Keyword(s):  
Job Performance ◽  
Electric Drive ◽  
Performance Index ◽  
Slip Rate ◽  
Transmission System ◽  
Torque Control ◽  
Power Performance ◽  
Simulation Results ◽  
Operation Cycle ◽  
Ac Induction Motor

According to the power performance index of the bulldozer, the matching calculation of electric drive tracked bulldozer transmission system is put forward, including AC induction motor, reduction ratios between motors and sprockets, engine-generator. Combined with the slip rate simulation of the special operation cycle conditions of bulldozer eletromechanical transmission system based on Matlab/Simulink is performed. Simulation results show that the dynamic characteristic satisfy the requirements of the job performance of the bulldozer. The matching calculation of the eletromechanical transmission system for bulldozer proved itself to be effective and feasible.

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