Relevant bibliographies by topics / AC traction drive

Academic literature on the topic 'AC traction drive'

Author: Grafiati
Published: 10 December 2022
Last updated: 19 February 2023

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Journal articles on the topic "AC traction drive"

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Zong, Jian, Yi Ruan, Ming Hui Chen, and Li Bo Xu. "Study on Narrow-Gauge Traction Locomotive Control System." Advanced Materials Research 418-420 (December 2011): 2074–77. http://dx.doi.org/10.4028/www.scientific.net/amr.418-420.2074.

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Most narrow-gauge vehicles driven by DC motor now, as DC drive due to power constraints and high maintenance costs, most of them will gradually be replaced by AC drives. But VVVF(Variable Voltage Variable Frequency) control method adopt in some running narrow-track traction locomotives, that can reduce over-current with load starting and should be compensated at low frequency. Based on study the Control strategies of narrow-track locomotives, comparing with the characteristics of power distribution of dual-motor drive system. The motor ought to have the same mechanical feature in dual-motor drive system, vector control strategy select in the control system. Experiments prove the system has good performance of stability, reliability, and good control performance, which can meet the narrow-track traction locomotive control requirements.
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Marinin, S. A. "Comparison of the energy efficiency of ac electric freight locomotives with collector and asynchronous traction drive." Herald of the Ural State University of Railway Transport, no. 1 (2022): 57–64. http://dx.doi.org/10.20291/2079-0392-2022-1-57-64.

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Electric locomotives with asynchronous traction drive are operated on the Russian road network in passenger and freight traffic. The advantage of such a drive is a large specific power. At first glance, electricity consumption of an electric locomotive with asynchronous traction drive should be less than that of an electric locomotive with a collector traction drive. The same is declared by manufacturers of traction rolling stock [1, 2]. But the answer to the question which electric locomotive is more economical in freight traffic: with a collector or asynchronous traction drive? - is far from being unambiguous [3, 4, 5]. In order to determine which electric locomotives have the best energy efficiency regarding the traction drive, a comparison of electric energy costs for traction of freight trains by electric locomotives of the VL80S series with collector traction drive, operated in two- and three-section versions, and a promising two-section electric locomotive of the 2ES7 series with asynchronous traction drive was performed. The energy efficiency assessment was carried out using methods based on elements of mathematical statistics and probability theory, including estimation of the distribution parameters of the studied quantities, statistical hypothesis testing and variance analysis. This article presents the main results of the research carried out at the testing area of the Gorky Railway during the pilot operation of the 2ES7 series electric locomotive on the Druzhinino - Vekovka section.
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Dubravin, Y., V. Tkachenko, and O. Spivak. "INCREASING THE ENERGY EFFICIENCY OF THE AC ELECTRIC LOKOMOTIVE TRACTION DRIVE." Collection of scientific works of the State University of Infrastructure and Technologies series "Transport Systems and Technologies" 1, no. 38 (December 24, 2021): 36–52. http://dx.doi.org/10.32703/2617-9040-2021-38-36-4.

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The study of the energy characteristics of the active traction converter with pulse-width modulation as part of the traction electric drive of an AC electric locomotive was held during the research. Active traction converter provides pulse-width control of the collector DC traction motors voltage and belongs to the basic AC / DC circuit. The transient process when switching transistor switches is accompanied by significant voltage surge, due to the scattering inductance reaction of the traction transformer. Studies have shown that the diode discharge buffer circuits do not provide discharge of the electromagnetic energy accumulated in the winding of the transformer. An active traction converter control algorithm has been developed, which implies the use of pulse-width and phase regulation of rectified voltage. Switching of transistor switches occurs in the presence of a parallel current circuit. This creates the conditions for the discharge of electromagnetic energy accumulated in the secondary winding circuit of the traction transformer. The developed mathematical model allows to investigate the electromagnetic processes that occur during the switching of transistor switches and to evaluate the energy efficiency of the electric locomotive with active traction converter. In the simulation process, the influence of active traction converter parameters and control algorithms on the power rate of the converter, the total THD distortion rate of current and voltage and the relative values of the rectified voltage were investigated. Measures to increase the power rate and to reduce the emission level of higher current harmonics into the traction network were proposed.
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Goolak, Sergey, Viktor Tkachenko, Pavol Šťastniak, Svitlana Sapronova, and Borys Liubarskyi. "Analysis of Control Methods for the Traction Drive of an Alternating Current Electric Locomotive." Symmetry 14, no. 1 (January 13, 2022): 150. http://dx.doi.org/10.3390/sym14010150.

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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.
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Biryukov, V. V., Yu A. Fedorova, and M. V. Rozhkova. "Simulation of drive power in mechatronic systems." Journal of Physics: Conference Series 2061, no. 1 (October 1, 2021): 012035. http://dx.doi.org/10.1088/1742-6596/2061/1/012035.

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Abstract The results of research on determining the parameters and circuit solutions of traction drives of funicular cars are presented in this paper. As a result of the research, it has been revealed that the funiculars, the bodies of which have an articulated joint, possess the greatest advantages. It is effectually to use three-phase AC machines with permanent magnets as traction electric motors. The mechanical part of the drive must contain a speed transformer with a gear rack-wheel type gearing. The wheels of the running gears perform the function of holding the car on the track structure. The traction force is performed in a gearing, the rack of which is placed between the rails of the track structure. The given method for calculating the power of the drive motor made it possible without question to determine its dependence on the angle of inclination of the railroad bed.
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B. Balaji and J. D. Anunciya. "Model Predictive Control based Direct Matrix Converter fed Permanent Magnet Synchronous Machine drives for Traction and Electric Mobility Applications." ARAI Journal of Mobility Technology 2, no. 1 (January 15, 2022): 140–51. http://dx.doi.org/10.37285/ajmt.1.1.8.

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There have been extensive research works going on electric mobility but most of these work and the existing electric mobility systems are battery-based DC systems. In some applications of electric mobility like traction and advanced technologies like electromagnetic induction charging, AC fed systems are employed due to the innate qualities of AC power transmission. Almost all the electric mobility systems we use are AC induction or permanent magnet machines. The conventional electric mobility systems including traction having AC as their energy source use two-stage conversion i.e. A fixed AC is converted to a fixed or variable DC link using a rectifier and finally, an inverter provides a variable AC in terms of frequency and magnitude according to the control algorithm. The two-stage conversion has its pros and cons but Matrix Converter (MC) will be a suitable and efficient alternative for AC fed AC motor drives. In the case of traction and other electric mobility applications, the load torque demand plays a significant role. The predictive control technique provides a suitable solution for these kinds of special drive applications due to their selective parameter control ability. Implementation of predictive control using a matrix converter is more effective than the conventional inverter fed drives, owing to the increased viability of matrix converter switching configurations. This paper discusses the mathematical implementation and comparison of Predictive Current Control (PCC) and Predictive Torque Control (PTC) with and without weighing factor for AC fed electric mobility applications. The efficacy of both the model predictive control techniques in concern of execution time, steady-state, transient, and dynamic conditions are analysed and validated along with the influence of diverse control variables in the cost function.
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Goolak, Sergey, Viktor Tkachenko, Gintautas Bureika, and Gediminas Vaičiūnas. "METHOD OF SPECTRAL ANALYSIS OF TRACTION CURRENT OF AC ELECTRIC LOCOMOTIVES." Transport 35, no. 6 (January 21, 2021): 658–68. http://dx.doi.org/10.3846/transport.2020.14242.

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An improved method for spectral analysis of traction current of an Alternating Current (AC) electric locomotive is considered in the article. A new method of spectral analysis considers the change in voltage in the catenary system as a non-deterministic, non-ergodic and non-Gaussian process. It has been established that higher voltage harmonics in the catenary system have a significant negative effect on the operation of non-traction railway consumers of electricity. In addition, electric locomotives operating in the same feeder zone have a mutual influence on each other. Electric railway transport is a source of higher voltage harmonics and strongly distorts the shape of the sinusoidal voltage of the catenary system, which are caused by the higher spectral components of the current in the electric locomotive traction drive circuit. These spectral components of the traction current arise in the traction drive circuit due to the nonlinearity of the current-voltage characteristics of the electronic devices of an electric locomotive, for example, a contact rectifier, a capacitor circuit of traction motors. Reactive power compensators are used in electric locomotives to eliminate components of higher harmonic traction current in the catenary system. Traditionally, spectral analysis in such systems is performed using Fourier methods. However, the determination of the spectral components of the traction current by the Fourier method for constructing a control system for a reactive power compensator is possible only if the process of voltage variation is a deterministic or ergodic Gaussian process. Otherwise, the application of Fourier transform methods will be incorrect. An analysis of the factors that affect voltage changes in the catenary system showed that this process is significantly different from the ergodic Gaussian process. Such factors include the following: the operating mode of the electric locomotives; number and total capacity of electric locomotives in one feeder zone; electric locomotives passing through feeder zones; instability of collection current. Thus, in the case under consideration, the application of the Fourier methods is incorrect for the analysis of the spectral components of the traction current. This affects the quality of compensation of the higher harmonic components of the traction current, and in some cases, the unstable operation of the control system of the active part of the reactive power compensator. Proposed scientific approach is based on the Levinson–Durbin linear prediction algorithm. On the one hand, this allows adapting the control system of the compensator to the voltage parameters of the catenary system. On the other hand, this allows taking into account the operating modes of electric rail vehicle with reactive power compensation. The construction of a compensator control system using the Levinson–Durbin algorithm significantly simplifies thensynchronization scheme of the compensator and power circuits of the traction electric drive of AC electric locomotive. A comparison of the traditional method of spectral analysis, based on the Fast Fourier Transform (FFT), and the method, based on the Levinson–Durbin algorithm, proposed by the authors, showed the high efficiency of the latter.
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Sengamalai, Usha, T. M. Thamizh Thentral, Palanisamy Ramasamy, Mohit Bajaj, Syed Sabir Hussain Bukhari, Ehab E. Elattar, Ahmed Althobaiti, and Salah Kamel. "Mitigation of Circulating Bearing Current in Induction Motor Drive Using Modified ANN Based MRAS for Traction Application." Mathematics 10, no. 8 (April 8, 2022): 1220. http://dx.doi.org/10.3390/math10081220.

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Induction motors are popularly used in various applications because of the proposed modest construction, substantiated process, and limited size of specific power. The traditional AC traction drives are experimentally analyzed. There is a high circulating current due to the high Common-Mode Voltage (CMV). The high Circulating Bearing Current (CBC) is a major problem in conventional two-level voltage source inverter fed parallel-connected sensor-based induction motors for traction applications. A sensorless method is well known for shrinking costs and enhancing the reliability of an induction motor drive. The modified artificial neural network-based model reference adaptive system is designed to realize speed estimation methods for the sensorless drive. Four dissimilar multilevel inverter network topologies are being implemented to reduce CBC in the proposed sensorless traction motor drives. The multilevel inverter types are T-bridge, Neutral Point Clamped Inverter (NPC), cascaded H-bridge, and modified reduced switch topologies. The four methods are compared, and the best method has been identified in terms of 80% less CMV compared to the conventional one. The modified cascaded H-bridge inverter reduces the CBC of the proposed artificial neural network-based parallel connected induction motor; it is 50% compared to the conventional method. The CBC of the modified method is analyzed and associated with the traditional method. Finally, the parallel-connected induction motor traction drive hardware is implemented, and the performance is analyzed.
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Zarifyan, A. A., and N. V. Talakhadze. "Comparative research of electrical energy transformation processes in locomotive traction drives with asynchronous motors and series-wound brushed DC motors." Journal of Physics: Conference Series 2131, no. 4 (December 1, 2021): 042079. http://dx.doi.org/10.1088/1742-6596/2131/4/042079.

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Abstract An estimate of the Russian railways expenses level for the purchase of fuel and energy resources is given. It is shown the costs for the purchase of electric energy for train traction account for more than half of the total costs. In this regard, the problem of increasing the traction rolling stock energy efficiency seems certainly relevant. The diagram of voltage and current measurements at the primary winding of the AC cargo electric locomotive transformer is given. The experimental data processing algorithm is proposed. A comparative analysis of the results obtained for electric locomotives with series-wound brushed DC motors (throughout what follows will be denoted as BTMs) and asynchronous traction motors (will be denoted as ATMs) showed that the power factor of the asynchronous drive is higher: 0.99, compared to 0.65 for the drive with BTMs; and the coefficient of nonlinear current distortions is only 0.15, compared to 0.53 for the BTMs. The conclusion is made about higher efficiency of electric energy conversion process in asynchronous traction drive in trust mode.
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Chen, Yue Dong, and Zhen Hua Xia. "Simulation and Implementation for the Speed Control System of Horizontal Continuous Casting Dragger for Copper." Advanced Materials Research 383-390 (November 2011): 1696–700. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.1696.

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The levels of continuous casting process of copper and copper alloy billet have many advantages, such as taking small footprint, low investment and the shorter flow. Recently, it develops very quickly all over the world. This article designs the dummy body drive control system based on the DSP digital signal processing chips, inverter and variable speed induction motor, and uses the unique process that space vector pulse width modulation strategy can achieve continuous casting horizontal tractor’s four beats to realize continuous casting process’ high-quality, stable and reliable implementation. Early in the 19th century, German Bismarck had proposed a continuous casting process in his patent. The development of this method in the copper industry began in 1940s, the type of equipment went through belt type, vibration mold, vertical traction type, tilt casting type and Horizontal traction type [1, 2]. Now, horizontal traction, as the most popular method abroad, because its products don’t need straightening, and consistency of properties along the length and high density of grain lead to the improvements of mechanical properties and electrical properties, its superiority in product quality and production efficiency is obvious. The design combined the modern AC variable speed control and advanced SCM control technology and traction continuous casting process to design a Speed controller of horizontal continuous casting of copper traction motor, its performance is similar with to dummy industrial control computer and AC servo motor drive control system, but the configuration of the hardware is less than half the price.
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Dissertations / Theses on the topic "AC traction drive"

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Selhi, Hocine. "Simulation of transients in AC traction systems." Thesis, University of Nottingham, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282843.

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Pokálený, Jan. "Trakční pohon elektromobilu napájený vodíkovým palivovým článkem." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217584.

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The topic of this diploma thesis is a traction drive of electrocar with fuel cell. The drive is supplied with hydrogen fuel cell with power of 2 kW. The traction drive consists of the three-phase DC/AC converter and the asynchronous machine. The main part of this work is a creation of the mathematical model of the traction drive in program Matlab–Simulink.
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Gitau, Michael N. "Optimal PWM switching strategy for single-phase AC-DC converters." Thesis, Loughborough University, 1994. https://dspace.lboro.ac.uk/2134/7205.

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The thesis describes an optimal selective harmonic elimination strategy suitable for singlephase AC-DC converter-fed traction drives. The objective is to eliminate low-order supply current harmonics, including those injected into the supply due to load-side current ripple. Other advantages that the switching strategy has to offer over phase-control include improved supply power factor, reduced VA consumption for a given demand speed and load, reduced torque and speed ripple and smaller armature circuit smoothing inductance. The effect of field current boost on the dynamic response of the drive is also described. It is shown that field boost helps to reduce the speed rise-time by increasing the electromagnetic torque available during acceleration periods. Closed-loop control of a 4-quadrant DC drive is described and a comparison made between the performance of PID-control and pseudo-derivative feedback control. It is shown that pseudo-derivative feedback control has several advantages to offer, amongst which are ease of tuning of the controller gains and a superior performance following load torque disturbances. A laboratory size drive system was designed and built, and used to validate simulation predictions for both the switching strategy and pseudo-derivative feedback control. A microcontroller based hardware implementation of both the switching strategy and a digital pseudo-derivative feedback controller was adopted, with the switching strategy being implemented using an off-line approach of precalculating the switching angles and storing these in look-up tables. The armature voltage controller comprises a dual-converter employing IGBTs as switching devices. The use of IGBTs allows higher switching frequencies at significant power levels than would be possible if GTOs were used. It also simplifies the gate drive circuit design and minimises the need to use snubber circuits.
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Серга, Богдан Петрович. "Векторно-керований асинхронний електропривод садового міні-трактора." Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2021. https://ela.kpi.ua/handle/123456789/42601.

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Дипломний проект містить: сторінок – 72, рисунків – 18, таблиць – 5 В даному дипломному проекті було досліджено тяговий асинхронний електропривід садового міні-трактора. Був проведений аналітичний огляд. Здійснено вибір двигуна. Розроблена функціональна схема системи а також виконано синтез регуляторів для векторного керування. Результати моделювання підтвердили працездатність і ефективність спроектованої системи. Виконання даного дипломного проекту забезпечувались за допомогою використання наступних програм: Microsoft Office Word, Microsoft Office Visio, Matlab.
The diploma project contains: pages – 72, figures - 18, tables - 5 In this diploma project the traction asynchronous electric drive of a garden mini-tractor was investigated. An analytical review was conducted. The engine is selected. The functional scheme of the system is developed and the synthesis of regulators for vector control is performed. The simulation results confirmed the efficiency and effectiveness of the designed system. Execution of this diploma project was provided by using the following programs: Microsoft Office Word, Microsoft Office Visio, Matlab.
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Patil, Niranjan Anandrao. "Field weakening operation of AC machines for traction drive applications." 2009. http://trace.tennessee.edu/utk_graddiss/78.

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(843817), Stanley Pang. "Digital signal processor based controller for an AC traction drive system." Thesis, 1995. https://figshare.com/articles/thesis/Digital_signal_processor_based_controller_for_an_AC_traction_drive_system/20335215.

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The aim of this research was to implement a modern digital control system using Digital Signal Processor (DSP) technology with an existing 10kW prototype AC traction drive system. The system drives an induction motor from a single phase supply, via two IGBT pulse width modulation (PWM) converters. The model was built as a teaching aid to demonstrate the implementation of various control strategies, and also acts as a research tool for the development of new control techniques. Because variable speed AC drives often utilise complex  mathematical calculations which must be performed very rapidly, normal microprocessor based systems often present the designer with serious difficulties. Engineers are therefore turning to DSP technology to replace such microprocessors. The two controllers used for this research were obtained from dSpace GmbH. Named 'DS1102', they were independent add-on cards for IBM PC's. Each DS1102 card contained two state-of-the-art Texas Instruments DSP processors; the TMS320C31 and the TMS320P14. The IBM PC was used for both software development, and system interfacing. Through the use of two 'Windows' based software packages known as COCKPIT and TRACE respectively, the user was able to adjust control system parameters, and monitor converter variables in real-time. These packages were designed specifically for research and education purposes. The PWM rectifier system provides a unity power factor utility interface capable of bi-directional power transfer, which also regulates the DC link voltage. The control technique is known as Predictive Current Control (PCC) with a fixed switching frequency. Briefly, the technique calculates the required duty ratio for the switches in order to bring the actual current equal to the demand current within a switching period. For the PWM inverter, semiconductor switching losses were a major concern. Therefore device switching frequency was limited to below 500 Hz. Accordingly a technique known as Direct Self Control (DSC) was chosen for the induction machine. It is based on a single switching command, and produces similar characteristics to a six -step inverter. The typical switching frequency achieved was approximately 300 Hz.

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Book chapters on the topic "AC traction drive"

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Liang, Jianying, Zhilin Rong, Zhixue Zhang, and Wenguang Luo. "Analysis on the Harmonic Coupling Relationship Between AC Drive Trains and Traction Nets." In Proceedings of the 2015 International Conference on Electrical and Information Technologies for Rail Transportation, 585–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49367-0_58.

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Konowrocki, Robert, and Tomasz Szolc. "An Analysis of Electromechanical Interactions in the Railway Vehicle Traction Drive Systems Driven by AC Motors." In Advances in Intelligent Systems and Computing, 225–35. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-27687-4_23.

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Conference papers on the topic "AC traction drive"

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Cheok, A. "AC drive with particular reference to traction drives." In APSCOM-97. International Conference on Advances in Power System Control, Operation and Management. IEE, 1997. http://dx.doi.org/10.1049/cp:19971858.

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Morimoto, Hiroaki, Tetsuo Uzuka, Akira Horiguchi, and Takemi Akita. "New type of feeding transformer for AC railway traction system." In 2009 International Conference on Power Electronics and Drive Systems (PEDS 2009). IEEE, 2009. http://dx.doi.org/10.1109/peds.2009.5385659.

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Zare, Majid, Ali Yazdian Varjani, Seyed Mohammad Dehghan, and Saeed Kavehei. "Power Quality Compensation and Power Flow Control in AC Railway Traction Power Systems." In 2019 10th International Power Electronics, Drive Systems and Technologies Conference (PEDSTC). IEEE, 2019. http://dx.doi.org/10.1109/pedstc.2019.8697653.

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Zhiwen Ma, Trillion Zheng, and Fei Lin. "Research on reciprocal power-fed AC drive test rig for electric traction applications." In Proceedings of the Eighth International Conference on Electrical Machines and Systems. IEEE, 2005. http://dx.doi.org/10.1109/icems.2005.202887.

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Hoang, K. D., J. Wang, M. Cyriacks, A. Melkonyan, and K. Kriegel. "Feed-forward torque control of interior permanent magnet brushless AC drive for traction applications." In 2013 IEEE International Electric Machines & Drives Conference (IEMDC). IEEE, 2013. http://dx.doi.org/10.1109/iemdc.2013.6556247.

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Perin, Igor, Peter F. Nussey, Umberto M. Cella, Truc V. Tran, and Geoffrey R. Walker. "Application of power electronics in improving power quality and supply efficiency of AC traction networks." In 2015 IEEE 11th International Conference on Power Electronics and Drive Systems. IEEE, 2015. http://dx.doi.org/10.1109/peds.2015.7203421.

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Nafis, Bakhtiyar Mohammad, Ange Iradukunda, and David Huitink. "Drive Schedule Impacts to Thermal Design Requirements and the Associated Reliability Implications in Electric Vehicle Traction Drive Inverters." In ASME 2018 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/ipack2018-8280.

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Power output to electric traction drive systems varies over a wide range during real-world operation. As a result, the inverters, responsible for converting direct current battery (DC) to alternating current (AC) for electric motor operation, experience temperature changes that are important to consider in thermal design of the whole system, as well as implications for reliability in actual use. Because of the implications of temperature on device & system reliability, it is necessary to design appropriate thermal management systems to control their temperatures to meet product reliability goals. This study utilizes US Environmental Protection Agency standard driving schedules as case studies in how driving characteristics result in power module temperature profiles during operation for various heat removal schemes and design efficiencies. The temperature profiles obtained in this study clearly demonstrate a strong relationship between motor power output and inverter heat sink temperature. Moreover, when integrated with various degrees of road incline, the driving schedules show how road and elevation also impacts the need for various cooling technologies. This information can be integrated into use condition analyses for predicting reliability of the electronic components using reliability models developed from accelerated testing and qualifications to ensure the proper certification envelope is demonstrated for any given vehicle and environment, as well as demonstrate the effectiveness of cooling methods for determination of technical and economic feasibility.
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van Gelder, R. "A universal traction drive system with minimal levels of interference currents for use on AC and DC supply systems." In International Conference on Electric Railways in a United Europe. IEE, 1995. http://dx.doi.org/10.1049/cp:19950187.

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Choudhury, Abhijit, Pragasen Pillay, and Sheldon S. Williamson. "A hybrid-PWM based DC-link voltage balancing algorithm for a 3-level neutral-point-clamped (NPC) DC/AC traction inverter drive." In 2015 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2015. http://dx.doi.org/10.1109/apec.2015.7104523.

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Mindl, Pavel, Zdeněk Čeřovský, and Pavel Mňuk. "Optimization of induction machine generator regime in electro mobile." In FISITA World Congress 2021. FISITA, 2021. http://dx.doi.org/10.46720/f2020-adm-099.

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The main physical parameters in case of traction vehicle design are: Maximal desired velocity, desired traction power and traction torque on vehicle velocity dependence. In case of electrically driven vehicles these requirements are solved by the variable parameters of electric energy for motor supply. Power required for motor terminals in accordance with vehicle speed are for comparable vehicles the same. In case of electric drive, the power, needed for motor supplying could have different parameters, characterized by the supply voltage, current and its frequency. Supply voltage and current frequency must be proportional to vehicle required speed of course. But torque creation is very sensitive on air gap magnetic field revolutions and machine rotor revolutions difference. This difference is characterized by the rotor current frequency (f2) or by the corresponding rotor current angular velocity ω2 = 2π f2. Operational regime of AC induction motor is characterized by three independent parameters: Stator voltage U1, stator voltage frequency f1 and rotor current frequency f2. These parameters determinates torque T, stator current I1 and its relation T/I1 unequivocally. Electrically driven vehicles enable to recuperate electric energy during braking interval. It is very temptingly to recuperate braking energy with maximal efficiency when relation I/T achieved its maximum for desired braking torque. To solve this problem is possible theoretically in case, if basic motor parameters – winding inductance and resistivity are constant parameters. But in real case resistivity changes with temperature and inductance depends on current. Therefore, in real case of this troubleshooting is based on theory and experiments combination. In case of induction machine working regime optimization it is necessary to split the task on the motor and generator regimes. In case of electric vehicle recuperation braking, it is convenient to achieve for desired braking torque maximal active current for electric accumulator charging. From theory and previous experiments imply that it exists I/T relation maximum like in motor so in generator regimes. Optimization of motor regime were analysed and experimentally verified in L/1/. The case of recuperation regime is analysed in this article.
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Reports on the topic "AC traction drive"

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Drive modelling and performance estimation of IPM motor using SVPWM and Six-step Control Strategy. SAE International, April 2021. http://dx.doi.org/10.4271/2021-01-0775.

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Abstract:
This paper presents a comprehensive evaluation of the performance of an interior permanent magnet (IPM) traction motor drive, and analyses the impact of different modulation techniques. The most widely used modulation methods in traction motor drives are Space vector modulation (SVPWM), over-modulation, and six-step modulation have been implemented. A two-dimensional electromagnetic finite element model of the motor is co-simulated with a dynamic model of a field-oriented control (FOC) circuit. For accurate tuning of the current controllers, extended complex vector synchronous frame current regulators are employed. The DC-link voltage utilization, harmonics in the output waveforms, torque ripple, iron losses, and AC copper losses are calculated and compared with sinusoidal excitation. Overall, it is concluded that the selection of modulation technique is related to the operating condition and motor speed, and a smooth transition between different modulation techniques is essential to achieve a better performance.
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