scholarly journals Analysis of Control Methods for the Traction Drive of an Alternating Current Electric Locomotive

Symmetry ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 150
Author(s):  
Sergey Goolak ◽  
Viktor Tkachenko ◽  
Pavol Šťastniak ◽  
Svitlana Sapronova ◽  
Borys Liubarskyi
Keyword(s):  
Vector Control ◽  
Short Circuit ◽  
Asynchronous Motor ◽  
Torque Ripple ◽  
Operating Conditions ◽  
Control Methods ◽  
Electric Locomotive ◽  
Traction Drive ◽  
Operating Modes ◽  
Traction Drives

The analysis of operating conditions of traction drives of electric locomotives with asynchronous traction motors has been carried out. It was found that during operation in the output converter of an asynchronous motor, defects may occur, which leads to asymmetric modes of its operation. Models of a traction drive of an electric locomotive with asynchronous motors with scalar and vector control of the output converter are proposed, taking into account asymmetric operating modes. As a result of the simulation, the starting characteristics of the traction drive were obtained for various control methods both in normal and emergency modes of the drive. For the drive-in emergency mode, the following cases were investigated: the balance of the converter output voltages and the turn-to-turn circuit of 10% of phase A winding of the motor stator; imbalance of the output voltages of the inverter and an intact motor; imbalance of the output voltages of the converter and interturn short circuit of 10% of phase A winding of the motor stator. Comparison of the simulation results have shown that in emergency modes in the traction drive, the torque ripple on the motor shaft in the drive with vector control is 13% less, and in scalar control, the phase current unbalance coefficient is 22% less. The results of this work can be used to study the influence of the output converter control methods on the energy efficiency indicators of the traction drive of an AC electric locomotive.

scholarly journals Indirect vector control for induction motor drive using two level and five level inverter

2019 ◽  
Vol 8 (2) ◽  
pp. 134
Author(s):  
Ankit Agrawal ◽  
Rakesh Singh Lodhi ◽  
Pragya Nema
Keyword(s):  
Vector Control ◽  
Induction Motor ◽  
Lower Order ◽  
Torque Ripple ◽  
Operating Conditions ◽  
Motor Drive ◽  
Induction Motor Drive ◽  
Ac Drives ◽  
And Performance ◽  
Cage Induction Motor

<p>This paper represent modelling &amp; simulation of indirect vector control for induction motor drive using two level and five level inverter. To overcome of lower order harmonics, THD &amp; speed torque characteristics of three phase squirrel cage induction motor. This paper provides solution through indirect vector control &amp; SPWM technique for multilevel inverter. A comparison and performance of two level and five level inverter are used in motor to control speed, current and torque. Matlab simulation environment are taken to simulate indirect vector control for induction motor drive using two level and five level inverter, so torque ripple minimization, lower order harmonics are reduced, constant speed, constant torque and variable speed variable torque are determined through simulation results. The applications under operating conditions are performed better THD, better reliability in AC drives.</p>

scholarly journals Modeling and analysis of vector control systems for asynchronous motor

2020 ◽  
Vol 178 ◽  
pp. 01001 ◽  
Author(s):  
Viktor Meshcheryakov ◽  
Tatyana Sinyukova ◽  
Alexey Sinyukov ◽  
Andrei Boikov ◽  
Rustem Mukhametzhanov
Keyword(s):  
Vector Control ◽  
Control Systems ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Asynchronous Motor ◽  
Evaluation Criteria ◽  
Torque Ripple ◽  
Modulation Method ◽  
Asynchronous Electric Drive ◽  
Vector Systems

The study aims at the analysis of vector control asynchronous electric drive systems. For comparison and evaluation, mathematical models of systems are implemented in the environment of simulation modeling Matlab Simulink. The evaluation criteria selected were: complexity of implementation, energy efficiency of the inverter, accuracy of speed maintenance, torque ripple, reaction speed of the system to disturbances from the side of the drive mechanism, impact on the supply network. Vector control systems by ensuring the maintenance of accuracy of the moment in the entire range of speed control are more widespread. The study of vector systems, the formation of the stator voltage vector in which is carried out using pulse-width modulation. The signal organization during the study was carried out by several methods. At the initial stage, the signal was formed due to relay-vector control in a closed loop for monitoring the instantaneous values of current errors without forced modulation; at the next stage of the study, the signal was generated using sinusoidal pulse-width modulation based on a comparison of control signals with some reference vector, the final stage became a spatial-vector modulation method.

scholarly journals THERMAL MODEL OF THE "INDUCTION GENERATOR–INDUCTION MOTOR" SYSTEM WITH NON–SYMMETRY IN THE STATOR WINDINGS

2021 ◽  
Vol 2 (53) ◽  
pp. 47-55
Author(s):  
V. Chenchevoi ◽  
◽  
Iu. Zachepa ◽  
O. Chornyi ◽  
R. Yatsiuk ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Thermal State ◽  
Asynchronous Motor ◽  
Operating Conditions ◽  
Factors Affecting ◽  
Thermal Transients ◽  
Operating Modes ◽  
Stator Windings ◽  
Asynchronous Generator

Purpose. Development of the IG model for estimation of influence of variations of parameters of the generator on quality of process of self–excitation at definition of the basic and boundary operating modes and system of initial excitation at invariable parameters of the generator. Result. The article presents studies of the system "asynchronous generator-asynchronous motor" with parametric asymmetry to determine the quality of generated electricity in load modes of operation on a mathematical model. The assessment of the thermal state in steady-state conditions was carried out using an equivalent thermal equivalent circuit. Thermal transients were investigated when starting an asynchronous electric motor from an autonomous power source based on an asynchronous generator. On a thermal mathematical model, a study of the influence of the asymmetry of the output voltage and its deviation from the nominal value on the heating of the connected asynchronous motor was carried out. A regression model has been developed for studying the operating conditions of electricity consumers when powered by an asynchronous generator with an asymmetry of the stator windings. Practical value. The use of the obtained equations will make it possible to determine the most rational combination of factors affecting the heating of the stator windings of asynchronous machines, at which they will not overheat in excess of the maximum permissible temperature values of the corresponding insulation classes. Figures 9, tables 2, references 23.

scholarly journals Research of remote protection operation in a branched sectioned line 10 kV

2020 ◽  
pp. 39-49
Author(s):  
A. Omelchuk ◽  
◽  
Y. Yarosh ◽  
V. Pryadko ◽  
O. Mashchenko ◽  
...  
Keyword(s):  
Short Circuit ◽  
Operating Time ◽  
Operation Time ◽  
Operating Conditions ◽  
Initial Time ◽  
Operating Modes ◽  
The Difference ◽  
The One ◽  
Percent Accuracy ◽  
Time Of Operation

The article investigates the parameters of setting up adjacent remote protections with remote start-up, taking into account the peculiarities of operating modes and operating conditions of partitioned branched distribution lines. The influence of parameters and modes of operation of such lines on the range of adjustment of settings on resistance and time of operation at the end of a zone of action and requirements to linearity of time characteristics that allows to define distances to a place of short circuit on operation time is defined. The results for setting up remote protections of partitioned lines with sources of distributed generation are obtained: the conditions for adjusting the protection settings for resistance to operation are determined taking into account the parameters of the partitioned lines and the limits of adjusting the settings for resistance to secondary values are determined. The conditions for adjusting the settings by the time of operation and the limits of the time of operation of protection for most lines are determined. For selective operation of protection at the selected settings on time of operation unambiguity of time characteristics at change of sizes of working currents of protection on condition of ten percent accuracy of work of protection on resistance of operation is provided. The conditions for ensuring the selective operation of adjacent protections in the selected range of settings by the time of operation, taking into account the ratio of resistances and the difference in the time of operation are determined. The initial time of protection protection is substantiated for debugging of protection on time of operation against operation of overvoltage limiters and against burnout of fusible insert of fuses of branches and unsoldering at short circuit directly behind the fuse. The use of modern microprocessor protection devices will ensure, on the one hand, the accuracy of the resistance, linear and unambiguous dependence of the operating time on the resistance of the short circuit at different levels of currents and voltages, etc., and on the other hand - ease of maintenance.

SVPWM Vector Control Speed Regulation System of Asynchronous Motor Based on DSP

2013 ◽  
Vol 373-375 ◽  
pp. 1294-1298
Author(s):  
Jin Li
Keyword(s):  
Vector Control ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Low Voltage ◽  
Asynchronous Motor ◽  
Torque Ripple ◽  
Low Noise ◽  
Regulation System ◽  
Motor Speed ◽  
Speed Regulation

Space vector pulse width modulation (SVPWM) is a method to control the AC asynchronous motor. SVPWM technology applied in AC speed regulation system can not only improve the shortcoming of low voltage utilization in the pulse-width modulation (PWM) technology, but have little torque ripple and low noise advantages. In this paper, a SVPWM vector control AC asynchronous motor speed regulation system employing a core TMS320LF2407A-type DSP chip was presented, and simulated the speed regulation system by MATLAB SIMULINK. The obtained simulation results indicate that the proposed speed regulation system has excellent dynamic and static performance, thus SVPWM control technology of asynchronous motor based on DSP has been implemented.

scholarly journals Vector control system of electric traction drive with power losses minimization

2021 ◽  
Vol 2131 (4) ◽  
pp. 042090
Author(s):  
T S Titova ◽  
A M Evstaf’ev ◽  
A A Pugachev
Keyword(s):  
Control System ◽  
Vector Control ◽  
Operating Conditions ◽  
Limiting Factors ◽  
Power Losses ◽  
Diesel Generator ◽  
Traction Drive ◽  
Asynchronous Motors ◽  
Electric Traction ◽  
Vector Control System

Abstract Based on the operating conditions analysis of electric traction drives of locomotives, it has been established that the vector control systems for an asynchronous motor fully satisfy all the requirements. On the basis of a T-shaped equivalent circuit, a mathematical model of an induction motor is presented, taking into account losses in the stator steel, the effect of the rotor current and saturation displacement. An algorithm for the formation of the optimal, from the point of view of power losses, task for the rotor flux linkage when using a vector control system with the orientation of the axes of the coordinate system along the rotor magnetic field, is developed. The limiting factors are the limitations on the current and voltage of the motor stator, the diesel generator set power. A shared control system for an electric traction drive with asynchronous motors has been developed, which provides direct control of wheel slip with a subordinate vector control system that minimizes power losses. The results of modeling in a steady-state operation and a start-up mode for an electric traction drive of a two-axle bogie with axial support and 630 kW asynchronous motors with the use of various options for organizing circuit reentrances are presented.

SEARCH FOR WAYS TO IMPROVE THE TRACTION PROPERTIES OF LOCOMOTIVES AND TRACTION DRIVE DESIGN

2021 ◽  
pp. 48-59
Author(s):  
Vladimir Vorob'ev ◽  
Aleksandr Pugachev ◽  
Oleg Izmerov ◽  
Evgeniy Nikolaev
Keyword(s):  
Pulse Width ◽  
Field Experiments ◽  
Pulse Width Modulation ◽  
Asynchronous Motor ◽  
Rolling Stock ◽  
Diesel Locomotive ◽  
Design Work ◽  
Traction Drive ◽  
Traction Motors ◽  
Traction Drives

The work objective is to increase the traction properties of locomotives without the use of traction drives with asynchronous traction motors and pulse width modulation. Research methods: methods of physical and field experiments, analytical methods for calculating the dynamics of the rolling stock. Conclusion: based on the conducted research, it is proposed to perform a promising diesel locomotive in the form of two sections on three two-axle bogies and a booster on two two-axle bogies, as well as to carry out experimental design work to develop an arc-type stator asynchronous motor and traction drives of a diesel locomotive using it.

Distributed Modeling Of Building Systems Through Cyber-Physical Integration

2019 ◽  
pp. 12-17
Keyword(s):  
Data Structure ◽  
Operating Conditions ◽  
Physical Models ◽  
Distributed Model ◽  
Physical Processes ◽  
Distributed Modeling ◽  
Distributed Models ◽  
Operating Modes ◽  
Building Systems ◽  
Important Practical Application

This article describes the proposed approaches to creating distributed models that can, with given accuracy under given restrictions, replace classical physical models for construction objects. The ability to implement the proposed approaches is a consequence of the cyber-physical integration of building systems. The principles of forming the data structure of designed objects and distributed models, which make it possible to uniquely identify the elements and increase the level of detail of such a model, are presented. The data structure diagram of distributed modeling includes, among other things, the level of formation and transmission of signals about physical processes inside cyber-physical building systems. An enlarged algorithm for creating the structure of the distributed model which describes the process of developing a data structure, formalizing requirements for the parameters of a design object and its operating modes (including normal operating conditions and extreme conditions, including natural disasters) and selecting objects for a complete group that provides distributed modeling is presented. The article formulates the main approaches to the implementation of an important practical application of the cyber-physical integration of building systems - the possibility of forming distributed physical models of designed construction objects and the directions of further research are outlined.

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