scholarly journals Methodology and Models of Combined Modeling of Electromagnetic Pro-cesses in Electric Traction Systems

2021 ◽  
pp. 40-49
Author(s):  
T. M Mishchenko
Keyword(s):  
Electric Power ◽  
Correlation Functions ◽  
Correlation Equation ◽  
Transition Function ◽  
Electric Locomotive ◽  
Electromagnetic Processes ◽  
Electric Traction ◽  
Traction System ◽  
First Time ◽  
Identification Model

Purpose. The main purpose of the work is the development of identification models and a new method of modeling electromagnetic processes in electric traction systems with simultaneous consideration of all its subsystems, as well as several feeder zones of the electrified section. Methodology. To achieve this purpose, the methods of mathematical modelling, the basics of the theory of random processes and the methodology of their probabilistic-statistical processing, the methods for solving integral equations and analysis of electric traction circuits in electric traction systems are used. Findings. The requirements to be met by an adequate, stochastic identification model of electric traction devices are established. The solution of Fredholm’s integral correlation equation of the first kind is performed. The analytical expression of the identification dynamic model of the electric locomotive DE–1 is obtained and its adequacy is checked. The methodology of combined modeling of electromagnetic processes in devices and subsystems of electric traction systems is developed and presented tabularly. Originality. For the first time it is proposed to use the pulse transition function as identification models of traction substation and traction network with electric rolling stock in predictive modeling of electromagnetic and electric power processes in electric traction systems. A new method has been developed, a method of complex modeling of electromagnetic and electric power processes in the system of electric traction with simultaneous consideration of all its subsystems, as well as several inter-substation zones of the electrified section. For the first time, a method of partitioning the correlation functions for solving an integral correlation equation has been proposed, which allows defining a pulse transition function as an identification model of any subsystem of an electric traction system. Practical value. The developed identification models and the method of combined modeling make it possible to predict electromagnetic processes simultaneously in all feeder zones of the electrified section of the electric traction system. The obtained identification model of the electric locomotive DE–1 can be adapted with its subsequent use in modeling processes in the traction circuits of electric locomotives of other types. The method of factorization of correlation functions used in solving the Volterra integral correlation equation of the first kind (convolution type) can be adapted to the solution of other integral equations, which describe the processes in electric traction systems.

scholarly journals The Julien Electric Traction System

Science ◽  
1889 ◽  
Vol ns-13 (310) ◽  
pp. 30-31
Author(s):  
W. BRACKEN
Keyword(s):  
Electric Traction ◽  
Traction System

The Study for the Electronic Control Technology of the Electric Power Traction System in the Bridge/Shipping Crash Testing Laboratory

2011 ◽  
Vol 255-260 ◽  
pp. 1750-1754
Author(s):  
Xiao Yuan Zhang ◽  
Mu Xi Lei ◽  
Zheng Bao Lei ◽  
Bi Feng Ou
Keyword(s):  
Electric Power ◽  
Control Method ◽  
Crash Test ◽  
Centralized Control ◽  
Testing Laboratory ◽  
Test Report ◽  
Crash Testing ◽  
Test Flow ◽  
Traction System ◽  
Logic Relationship

The electric power traction system in the Bridge/Shipping Crash Testing Laboratory, is the foundation of the crash test between the shipping and the bridge. In order to make sure the process more quickly, stably, accurately, centralized-control method has been applied in the electric power traction system of the Bridge/Shipping Crash Testing Laboratory in The Changsha University of Science and Technology, so the test flow has been controlled and finished automatically, the test data could be collected and recorded automatically, safety alarm, protect automatically and the history data could be recorded on the real-time, the test report form could been formed automatically and the manage function will be worked and so on. The problem of complexity of the test flow, the difficulty of the induction about the logic relationship, the strong electromagnetism interfere in the big current equipment, the machine shock is strong and so on would be solved, the traction system in the crash test would be made more real and mature.

Conceptual approach to problem of economic efficiency substantiation of three-phase alternating current system of electric traction

2020 ◽  
pp. 74-79
Author(s):  
Boris Alexeevich Arzhannikov ◽  
◽  
Vladimir Alexeevich Koksharov ◽  
Keyword(s):  
Economic Efficiency ◽  
Current System ◽  
Alternating Current ◽  
Railway Transport ◽  
Conceptual Approach ◽  
System Effect ◽  
Three Phase ◽  
Optimal Values ◽  
Electric Traction ◽  
Traction System

The paper proposes a conceptual approach to economic efficiency substantiation of three-phase alternating current system of electric traction in comparison with one-phase alternating current system of electric traction. It is based on quasi-optimal values of indicators of electric traction system that are necessary for feasibility study and assessment of integral criterion of efficiency, for which, in turn, it is necessary to compare systems by reduced expenditures. Saving of reduced expenditures should also consider out-of-transport effect that is very important for system effect of interaction between railway transport and other enterprises.

scholarly journals Reduction of electric power losses by the reactive power compensation unit at the point of AC electric traction network sectioning

2019 ◽  
Vol 78 (5) ◽  
pp. 297-302
Author(s):  
Leonid A. German ◽  
Aleksander S. Serebryakov
Keyword(s):  
Electric Power ◽  
Carrying Capacity ◽  
Reactive Power ◽  
Reactive Power Compensation ◽  
Baseline Data ◽  
Power Losses ◽  
Method Of Calculation ◽  
Traction Network ◽  
Electric Traction ◽  
Positive Effect

Changes of electric traction network with regulated and not-regulated reactive power compensation units (CU) are required due to switching on the reactive power static generators at the AC electric traction network sectioning points the specifying calculations of the reactive power. The method of calculation of power losses in the traction network with regulated and not-regulated cross capacity compensation units at the sectioning point was developed. The main positive effect of CU at the sectioning point is increasing of the carrying capacity of the railroad sections. However, calculation of CU effectiveness for reduction of electric power losses, as well as calculation of continuously controlled CU requires appropriate calculations. It is demonstrated that CU effectiveness at the sectioning points of reactive power compensation is reduced in connection with distribution of the draft load; CU regulation effectiveness is also reduced as a response to increase of the carrying capacity of the railroad section, which allows assessing the proposed calculation formulae. Presented examples of calculation for the actual baseline data demonstrate that full losses in the traction network (assumed as 100%) can be reduced by using of CU of the sectioning point up to 21% maximum with continuously controlled units and up to 13.4% with uncontrolled CU. As automatics of the reactive power static generator is designed for increasing the carrying capacity of the railroad, its operation frequently complies with the reactive power overcompensation regime when losses in the traction network are increased.

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