Journal articles: 'Current control of the traction accumulator'

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Arhun, S., Yu Borodenko, A. Hnatov, A. Popova, H. Hnatova, N. Kunicina, A. Ziravecka, A. Zabasta, and L. Ribickis. "Choice of Parameters for the Electrodrive Diagnostic System of Hybrid Vehicle Traction." Latvian Journal of Physics and Technical Sciences 57, no. 4 (August 1, 2020): 3–11. http://dx.doi.org/10.2478/lpts-2020-0017.

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AbstractWhen operating a hybrid vehicle (HEV), it is important to reduce maintenance and repair costs. The HEV electric drive (ED) consists of electronic, electrical and mechanical parts and is considered a complex diagnostic model. The availability of an electrical part greatly simplifies the process of monitoring and obtaining information about the state of the system. In order to create a hybrid diesel-electric propulsion system (HDEPS), the choice of structural and functional parameters as diagnostic ones is justified, the control points are chosen, and the necessary accuracy and unambiguity of measurements are determined. Qualitative evaluations of the electrical processes occurring in the power supply circuit of ED from a high-voltage accumulator battery for the selection of diagnostic parameters according to the criteria of sensitivity, informative character, stability and manufacturability of measurements are presented. It has been revealed that during HDEPS diagnostics both stable and transient modes of operation of electric machines should be considered; for analysis of ED technical state it is necessary to have information about current mode of HDEPS load; for measurement of instantaneous values of supply voltage and consumption current it is necessary to select the sensors with short response time and linear conversion function. In terms of sensitivity to structural changes in the circuit and parametric deviations, it is necessary to choose, as diagnostic parameters, the voltage or current, depending on the mode of operation of the ED and the point of measurement of the electrical value. The obtained results are the basis for creating a new system of diagnostics of electric power supply HDEPS in this direction.

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Dobrucky, Branislav, Slavomir Kascak, Michal Frivaldsky, and Michal Prazenica. "Determination and Compensation of Non-Active Torques for Parallel HEV Using PMSM/IM Motor(s)." Energies 14, no. 10 (May 12, 2021): 2781. http://dx.doi.org/10.3390/en14102781.

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The paper deals with the determination and compensation of non-active torques of parallel HEV using an auxiliary electrical PMSM or IM motor. The non-active oscillating torque generating by the ICE engine was estimated, and consequently, the compensating torque component of the current was determined. Based on real measured data, the four regimes of operation have been investigated: compensating non-active torques, parallel operation, regenerating for PMSM, and both parallel operations, together with compensation. Using of p-q theory, the power of fundamental harmonic is presented by average values PAV, QAV of total power waveforms p(t), and q(t). Worked-out simulation results are used for sizing and dimensioning of PMSM machine, VSI inverter, and traction accumulator-battery. Circuit simulator Matlab/Simulink was used for all simulation experiments.

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Young, Jieh Shian, Yu Bang Lin, Kuan Jie Chen, and Po Ting Chen. "Gain-Scheduled Control Approach by Logarithm Transformation for Electrical Vehicle Traction Force Control." Applied Mechanics and Materials 619 (August 2014): 283–87. http://dx.doi.org/10.4028/www.scientific.net/amm.619.283.

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This paper proposes an approach by logarithm to evaluating the electrical vehicle traction force control directly instead of the slip ratio measurements. Utilizing the built character database of the driven motor, or so-called current-RPM-torque database, a gain-scheduled approach by logarithm transformation is developed to provide the appropriate traction force while one traction wheel of the vehicle is traveling into different road surface. An illustrated simulation with a scenario close to real situation is also given to show the feasibility to evaluate and control the traction force through the database of the motor.

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Nezevak, Vladislav Leonidovich, and Svyatoslav Sergeevich Samolinov. "Application of electric power accumulators in traction power supply system in order to increase capacity on «bottleneck» sections." Transport of the Urals, no. 1 (2020): 104–9. http://dx.doi.org/10.20291/1815-9400-2020-1-104-109.

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The paper considers issues of increasing capacity on «bottleneck» sections of direct current railways by means of application of electric power accumulators. Selection of electric power accumulators location is carried out with the consideration for grading of track on a section, specific recuperation, dominance of traffic type, rate of electric rolling stops, mode of feeding of intersubstational zones. When determining power consumption and capacity of electric power accumulators a depth of discharge that affects a service life and a state of charge graph that depends on a selected characteristic of charging rate are considered. The procedure of assessing the influence of electric power accumulator operation on capacity is considered on the example of one of the railway sections.

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Yan, Shi Rong, and Shi Zhong Li. "Study on an EV Traction Control Strategy." Applied Mechanics and Materials 141 (November 2011): 605–10. http://dx.doi.org/10.4028/www.scientific.net/amm.141.605.

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According to an electrical vehicle (EV) construction and working principle, a dynamic model governing its motion was established. A built-in permanent magnet synchronous motor was selected as its driving motor and a mathematical model about the motor working principle was described also. To get good motion effect, a motor driving control system with a current loop and a speed loop was developed. The current loop consists of maximum torque per ampere control and field weakening control. The speed loop is based on a sliding mode control. To make the EV working more smooth, stable and safer, its traction control includes driving motor control and wheel braking control. During some acceleration or cornering, wheel braking control is introduced to keep driving wheels in good slip states, especially to make the car in a good stable and safe state. Simulation study based on MATLAB/Simulink showed the control strategy developed here can make the EV work well, even when it runs on some asymmetric road.

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Uteshevs, Igors, and Anatoly Levchenkov. "Modeling of overheat process control of electric motor." Scientific Journal of Riga Technical University. Power and Electrical Engineering 25, no. 25 (January 1, 2009): 61–64. http://dx.doi.org/10.2478/v10144-009-0013-3.

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Modeling of overheat process control of electric motorThe paper presents the research of heating electric traction motor, the temperature dependence of the load current and control impact. The process of heat in heating electric traction motor is given.

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Putri, Tsamaroh Nidaa, and Priyo Sasmoko. "ALAT PEMANTAU PENGOSONGAN AKUMULATOR 12V/ 5Ah BERBASIS ARDUIONO UNO." Gema Teknologi 18, no. 4 (April 30, 2016): 10. http://dx.doi.org/10.14710/gt.v18i4.21910.

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Tsamaroh Nidaa Putri, Priyo Sasmoko explains that accumulator is a combination of several pieces of cells used for altering the chemical energy into electricity energy used in motor vehicles. Accumulators are used continuously will shrink and drop so it needs to be recharged. To know the state of the battery voltage drop experienced the need for a measurement to determine the ability of the accumulator. Design manufacture accumulator discharge monitoring tool consists of a voltage divider circuit to know the big accumulator voltage in percentage form. Used also an ACS712 current sensor to detect the discharge current and LM35 temperature sensor to determine the temperature of the accumulator. The control system used is the Arduino UNO microcontroller and an LCD for displaying the measurement data. Normal voltage ranges accumulator 12,5V - 13,8V. Accumulator with a capacity of 5Ah takes 8 hours to process discharge when using 20 watt lamp load. If the voltage of the first accumulator on the LCD shows the percentage of 0 % then automatically the system will work to discharge for a second accumulator. The duration of use depends on the large accumulator load used. Keyword:Accumulator, ACS712, capacity accumulator, Arduino UNOReferencesAgustin, Leonandi. 2015. Rancang Bangun Sistem Monitoring Kondisi Aki Pada Kendaraan Bermotor. Skripsi. Universitas Tanjungpura Pontianak.Andri, Helly. 2010. Rancang Bangun System Battery Charging Automatic. Skripsi S1 Teknik Elektro Fakultas Teknik Universitas Indonesia.Asnan, Zainal. 2007. Alat Pengecekan Kapasitas Aki (Accu) Berbasis Personal Computer. Skripsi. Universitas Katolik Widya Mandala Surabaya.Bishop, Owen. 2004. Dasar-dasar Elektronika. Jakarta: Erlangga, Alih Bahasa Irzam Harmein.Fadli, Usman. 2015. Aplikasi Sensor Arus ACS712 Dan Borland Delphi 7.0 untuk Monitoring Penggunaan Daya Listrik pada Rumah Berbasis Arduino UNO. Tugas Akhir. Universitas Diponegoro.Frank D. Petruzella., 2001, Elektronika Industri. Yogyakarta: Penerbit ANDI, Penerjemah Suminto, Drs. MA.,Kadir, Abdul. 2013. Panduan Praktis Mempelajari Aplikasi Mikrokontroler dan Pemrogamannya Menggunakan Arduino. Yogyakarta: Penerbit ANDI.Marpaung, May Harpri Rabiman. 2014. Monitoring Suhu dengan Menggunakan Sensor Suhu LM35 Serta Pengaturan Suhu Pada Otomatisasi Dispenser Berbasis Arduino UNO dengan Tampilan LCD. Tugas Akhir. Universitas Diponegoro.Salim, Emil. 2014. Perancangan dan Implementasi Telemetri Suhu Berbasis Arduino UNO, Skripsi. Universitas Sumatra Utara.Setiyawan, Danang Duwi. 2015. Pengisi Baterai Akumulator Otomatis Berbasis Mikrokontroller. Tugas Akhir. Universitas Gajah Mada.Tooley, Michael. 2003. Rangkaian Elektronik Prinsip dan Aplikasi. Jakarta: Erlangga, Alih Bahasa Irzam Harmein

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Han, Jingang, Xin Gu, Yi Yang, and Tianhao Tang. "Dynamic Improvement with a Feedforward Control Strategy of Bidirectional DC-DC Converter for Battery Charging and Discharging." Electronics 9, no. 10 (October 21, 2020): 1738. http://dx.doi.org/10.3390/electronics9101738.

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With the increasing importance of power accumulator batteries in electric vehicles, the accurate characteristics of power accumulator batteries have an important role. In order to evaluate the power accumulator battery, battery charging and discharging is indispensable. In this article, a H-bridge bidirectional DC-DC converter is presented which can charge and discharge the battery with different voltage levels and one of the merits of this topology is that a wide output voltage range can be easily achieved. In the control part, a proportional-integral (PI) control strategy is adopted to ensure a stable and reliable operation of the converter. Furthermore, compared with the PI control strategy, a duty ratio feedforward control is utilized to obtain the rapid current dynamic response. In this article, firstly, the system configuration for battery charging and discharging is introduced, then the operating principles and mathematical model of the DC-DC converter are analyzed and derived. Secondly, for bidirectional DC-DC converters, the PI control method and duty ratio feedforward control method are put forward and designed. Finally, the simulation model is established based on PSIM software and the experiment platform is also built in lab. The results of the simulation and experiment research show that the H-bridge bidirectional DC-DC converter can operate reliably and stably during the charging, discharging and power flow reverse modes. In addition, the dynamic response of the charging and discharging current can also be further improved by introducing the duty ratio feedforward control method.

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Frantz, Jonathan M., Sushant Khandekar, and Scott Leisner. "Silicon Differentially Influences Copper Toxicity Response in Silicon-accumulator and Non-accumulator Species." Journal of the American Society for Horticultural Science 136, no. 5 (September 2011): 329–38. http://dx.doi.org/10.21273/jashs.136.5.329.

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The use of copper (Cu) in agriculture is widespread as a pesticide, and it is present in high concentrations in certain types of manures. As the use of Cu continues and manure management is incorporated into sustainable systems, the likelihood of Cu toxicity increases. Supplemental silicon has been used to successfully counteract potential micronutrient toxicity. There is currently considerable debate regarding the value of including silicon (Si) as a nutrient in fertility programs and as such, it is not part of a typical management practice in floriculture crop production in the United States. We investigated the potential for Si to ameliorate the effects of Cu toxicity in both a Si-accumulating [zinnia (Zinnia elegans)] and a Si-non-accumulating [snapdragon (Antirrhinum majus)] species. Using visible stress indicators and dry weight analysis, it initially appeared that Si was a significant benefit to only zinnia under Cu toxicity. Enzymatic assays and elemental analysis of leaves, stems, and roots revealed that both species responded to supplemental Si, showing evidence of reduced stress and nutrient concentrations more similar to healthy, control plants than plants exposed to Cu toxicity. Although there appear to be differences in the extent of Si-mediated amelioration of Cu toxicity between these two plants, both responded to supplemental Si. This adds to the growing body of evidence that all plants likely have Si-mediated responses to stress, and its inclusion into fertility programs should be more broadly considered than current practices.

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Sun, Xin Yu. "Cophase Power Supply Control Technology in the Application of the Electric Traction Locomotive." Applied Mechanics and Materials 513-517 (February 2014): 3938–41. http://dx.doi.org/10.4028/www.scientific.net/amm.513-517.3938.

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China's current traction net unilateral power supply mode and the existing traction substation connection and phase change connection determine the existence of stationary phase of traction network. Therefore, the application of modern power electronics and microprocessor control technology and the development of cophase power supply technology with independent intellectual property rights are the way to realize the innovation of traction power supply technology, which will achieve a win-win situation for cophase power and electric power development, it has the vital significance.

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Zong, Jian, Ping Qian, and Xue Feng Ding. "Study of Electrical Traction Locomotive Control System Based on Feed-Forward Decoupling Strategy." Advanced Materials Research 516-517 (May 2012): 1935–38. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.1935.

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An asynchronous motor is widely used in traction locomotive system now, AC induction motor is nonlinear, strongly coupled and multivariable system, so it is very difficult to control as a linear system. For this, VVVF(Variable Voltage Variable Frequency) control method adopt in some running traction locomotives, that can reduce over-current with load starting and should be compensated at low frequency. Based on study the Control strategies of locomotives, vector control adopt in most electrical traction locomotive. According to the drawing performance requirements of electrical traction motor, feed-forward decoupling method adopted. Simulation and experiment proved this method can meet the traction locomotive control requirements.

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Gou, Bin, Xing‐Lai Ge, Yong‐Chao Liu, and Xiao‐Yun Feng. "Load‐current‐based current sensor fault diagnosis and tolerant control scheme for traction inverters." Electronics Letters 52, no. 20 (September 2016): 1717–19. http://dx.doi.org/10.1049/el.2016.0675.

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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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Meng, Tian Jiao. "Design on Intelligent Control System in Gyms of Generating Electricity." Advanced Materials Research 926-930 (May 2014): 1509–12. http://dx.doi.org/10.4028/www.scientific.net/amr.926-930.1509.

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By recycling the kinetic energy in gyms, a generating system is closely related to this design, in which a perfect output circuit has been used so as to output a constant voltage no matter how variable the power of the kinetic energy is. Consequently, a continuing and constant current will be output when an electrical storage device is equipped. Based on a systematic analysis of the generator, accumulator and loading equipment, this thesis would grasp the variation tendency of each variable in the generating system, thus to realize the grid-connected operation of the existing alternating current and the generating system built-up by the fitness equipment.

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Du, Zhekang, Kai Loon Cheong, and Perry Y. Li. "Energy management strategy for a power-split hydraulic hybrid vehicle based on Lagrange multiplier and its modifications." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 233, no. 5 (September 24, 2018): 511–23. http://dx.doi.org/10.1177/0959651818801416.

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Lagrange multiplier approach is a computationally efficient method for computing optimal energy management strategy for a hydraulic hybrid vehicle under the assumption that the accumulator dynamics can be ignored and only the net use of storage energy is considered. Although it provides a close estimate to the fuel economy compared to that obtained using dynamic programming, the resulting control strategy does not respect the physical limits of the storage capacity of the hydraulic accumulator. Thus, the synthesized control strategy is not feasible for actual driving. This article investigates the basic Lagrange multiplier approach for real-time control and proposes modifications so that the storage capacity is respected. It is shown that the Lagrange multiplier can be interpreted as an equivalent loss factor which turns out to be the marginal loss associated with the discharge of stored energy. The two proposed modifications are as follows: (1) a moving horizon approach and (2) making the Lagrange multiplier a function of the current state of charge. Both methods are successful in maintaining the accumulator state of charge within limits with modest effect on fuel economy (3%–5% lower).

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Matúš Danko, Branislav Hanko, and Peter Drgoňa. "Optimized Control of Energy Flow in an Electric Vehicle Based on GPS." Communications - Scientific letters of the University of Zilina 23, no. 1 (October 28, 2020): C7—C14. http://dx.doi.org/10.26552/com.c.2021.1.c7-c14.

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Presented paper deals with energy flow control of an electric vehicle with multiple energy storages. For efficiency control of energy flow is necessary to know the traction profile of the route. The Global Positioning System is used for observation of the traction profile. The first of the proposed algorithms uses the whole traction profile of a predetermined route, so the control algorithm can determine when the use of energy of the secondary energy storage is useful. The second proposed algorithm uses the GPS to determine the traction profile from routes stored in memory. If the route is not predetermined, or found in the memory of stored routes, the last algorithm controls the energy flow, based on the current of the primary energy storage. For verification of the proposed algorithm for control of the DC/DC converter, motor with inverter was replaced by the programmable power supply and programmable electronic load. The final evaluation shows that the proposed algorithm with the predetermined route saves about 5% more energy than the basic algorithm based on the battery current.

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Antipin, Dmitriy, Vladimir Vorob'ev, Oleg Izmerov, Maksim Maslov, Vadim Korchagin, Dmitriy Petrakov, and Pavel Zhirov. "PROBLEMS IN DEVELOPMENT OF ENERGY-SAVING TRACTION DRIVE." Bulletin of Bryansk state technical university 2021, no. 3 (March 9, 2021): 25–38. http://dx.doi.org/10.30987/1999-8775-2021-3-25-38.

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The problems of traction properties increase in locomotives are considered. The necessity in devices for instantaneous control of a friction coefficient of wheels and rails based on the impact of electric current or a magnetic field upon a wheel/rail contact area. There are defined basic fields of researches essential for the actual realization of such devices. It is defined that devices based on electric current impact require the introduction of considerable changes in the units of a crew part for wheel pair insulation and searches of problem solution in the separation of traction current and control one and the prevention of control current impact upon alarm systems. It is offered to consider magnetic amplifiers of adhesion as a solution of a short-term outlook which can be introduced in an existing locomotive fleet and those using current impact as a solution of newly-developed promising machines. There is offered a design of an individual traction drive simplifying a problem in the arrangement of devices for instantaneous control of a friction coefficient.

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Zhang, Yi, Qiang Shen, Liqiang Hou, and Shufan Wu. "Non-Propellant Eddy Current Brake and Traction in Space Using Magnetic Pulses." Aerospace 8, no. 2 (January 20, 2021): 24. http://dx.doi.org/10.3390/aerospace8020024.

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The safety of on-orbit satellites is threatened by space debris with large residual angular velocity and the space debris removal is becoming more challenging than before. This paper explores the non-contact despinning and traction problem of high-speed rotating targets and proposes an eddy current brake and traction technology for space targets without any propellant consumption. The principle of the conventional eddy current brake is analyzed in this article and the concept of eddy current brake and traction without propellant is put forward for the first time. Secondly, according to the key technical requirements, a brand-new structure of a satellite generating artificial magnetic field is designed accordingly. Then the control mechanism of eddy current brake and traction without propellant is analyzed qualitatively by simplifying the model and conditions. Then, the magnetic pulse control method is proposed and analyzed quantitatively. Finally, the feasibility of the technology is verified by the numerical simulation method. According to the simulation results, the eddy current brake and traction technology based on magnetic pulses can make the angular speed of target decrease linearly without propellant during the process. This technology has huge advantages compared with conventional eddy current brake technology in terms of efficiency and reduced propellant consumption.

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Zong, Jian, Yi Ruan, Ming Hui Chen, and Li Bo Xu. "Study and Implement on the Control System of Traction Locomotive Based on Torque Current Closed-Loop." Applied Mechanics and Materials 121-126 (October 2011): 3502–5. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.3502.

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In order to overcome the poor stationarity of traction locomotive during the operation mode switching, with rotor flux oriented vector control theory based on, torque model control strategy is adopted. It can overcome the DC bus pumping as Locomotive deceleration and barking. In this system, output torque can be controlled directly, experiments verify the system has good performance of stability and reliability, which can meet the traction locomotive control requirements.

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Lee, Sung-Gu, Jae-Nam Bae, and Won-Ho Kim. "Study on Calculation Process of Current and Current Phase Angles Considering Control for Traction IPMSMs." Journal of the Korean Society for Railway 21, no. 2 (March 31, 2018): 159–65. http://dx.doi.org/10.7782/jksr.2018.21.2.159.

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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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He, Liqun, Jian Xiong, Hui Ouyang, Pengju Zhang, and Kai Zhang. "High-Performance Indirect Current Control Scheme for Railway Traction Four-Quadrant Converters." IEEE Transactions on Industrial Electronics 61, no. 12 (December 2014): 6645–54. http://dx.doi.org/10.1109/tie.2014.2316240.

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Venghi, Luis Esteban, Facundo Aguilera, Pablo M. De la Barrera, and Cristian H. De Angelo. "Single-Observer Based Current Sensor Fault Tolerant Control for IM Traction Drives." IEEE Latin America Transactions 19, no. 12 (December 2021): 2087–96. http://dx.doi.org/10.1109/tla.2021.9480151.

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Yun, Chun-Gi, Seunghoon Baek, Hanyoung Bu, Younghoon Cho, Jin-Hyuk Park, and Myung-Yong Kim. "Simple current control without grid voltage sensor for traction solid-state transformer." Journal of Power Electronics 21, no. 4 (February 8, 2021): 703–12. http://dx.doi.org/10.1007/s43236-020-00214-4.

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Buyakova, Natalya, Vasiliy Zakaryukin, and Andrey Kryukov. "Control of electromagnetic environment in smart traction power supply systems." E3S Web of Conferences 91 (2019): 01009. http://dx.doi.org/10.1051/e3sconf/20199101009.

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The possibility of reducing the intensity of magnetic field created by a traction network of an alternating current electrified railroad is considered in the article. The electric field of such a traction network at a height of 1,8 m above is relatively small. In order to control the electromagnetic situation, 2x25 kV traction systems, sucking transformers with a return wire for the 25 kV system, amplifying and shielding wires of the traction network, passive screens on passenger platforms, optimization of train traffic schedules can be used. Fazonord software package developed at the Irkutsk State Transport University was used as a tool for the analysis of the above events. Using computer simulations, it was shown that the most effective methods for reducing the magnetic field strength are the use of screens on passenger platforms, optimal train schedules, and the use of “soft” train driving modes. The latter measure is able to reduce the peak magnetic field strength by about 25%.

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Zhou, Yuan Hua, Hong Wei Ma, Hai Yan Wu, and You Jun Zhao. "Constant Cutting-Power Control of Shearer Based on Neural Network Model Predictive Control." Advanced Materials Research 823 (October 2013): 340–44. http://dx.doi.org/10.4028/www.scientific.net/amr.823.340.

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To solve the problem of constant power control of shearer cutting machine, the nonlinear predictive control method based on Neural Network was proposed in this thesis. In the method, the cutting current was used to identify the cutting load, and the Neural Network was used to predict and control the traction speed. A Neural Network model was built by the current and speed to control the cutting power of shearer. In MATLAB, the field data was used to simulate and the simulation verify the proposed scheme is better than PID method.

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Kohara, Akira, Katsuhiro Hirata, Noboru Niguchi, and Kazuaki Takahara. "AC/DC current ratio in a current superimposition variable flux reluctance machine." Open Physics 16, no. 1 (May 24, 2018): 215–18. http://dx.doi.org/10.1515/phys-2018-0031.

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Abstract We have proposed a current superimposition variable flux reluctance machine for traction motors. The torque-speed characteristics of this machine can be controlled by increasing or decreasing the DC current. In this paper, we discuss an AC/DC current ratio in the current superimposition variable flux reluctance machine. The structure and control method are described, and the characteristics are computed using FEA in several AC/DC ratios.

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Wang, Yaqi, and Zhigang Liu. "Suppression Research Regarding Low-Frequency Oscillation in the Vehicle-Grid Coupling System Using Model-Based Predictive Current Control." Energies 11, no. 7 (July 10, 2018): 1803. http://dx.doi.org/10.3390/en11071803.

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Recently, low-frequency oscillation (LFO) has occurred many times in high-speed railways and has led to traction blockades. Some of the literature has found that the stability of the vehicle-grid coupling system could be improved by optimizing the control strategy of the traction line-side converter (LSC) to some extent. In this paper, a model-based predictive current control (MBPCC) approach based on continuous control set in the dq reference frame for the traction LSC for electric multiple units (EMUs) is proposed. First, the mathematical predictive model of one traction LSC is deduced by discretizing the state equation on the alternating current (AC) side. Then, the optimal control variables are calculated by solving the performance function, which involves the difference between the predicted and reference value of the current, as well as the variations of the control voltage. Finally, combined with bipolar sinusoidal pulse width modulation (SPWM), the whole control algorithm based on MBPCC is formed. The simulation models of EMUs’ dual traction LSCs are built in MATLAB/SIMULINK to verify the superior dynamic and static performance, by comparing them with traditional transient direct current control (TDCC). A whole dSPACE semi-physical platform is established to demonstrate the feasibility and effectiveness of MBPCC in real applications. In addition, the simulations of multi-EMUs accessed in the vehicle-grid coupling system are carried out to verify the suppressing effect on LFO. Finally, to find the impact of external parameters (the equivalent leakage inductance of vehicle transformer, the distance to the power supply, and load resistance) on MBPCC’s performance, the sensitivity analysis of these parameters is performed. Results indicate that these three parameters have a tiny impact on the proposed method but a significant influence on the performance of TDCC. Both oscillation pattern and oscillation peak under TDCC can be easily influenced when these parameters change.

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Steczek, Marcin. "Effect of the supply voltage fluctuations on the efficiency of the technique of shaping the current spectrum generated by VSI traction drive." MATEC Web of Conferences 180 (2018): 05002. http://dx.doi.org/10.1051/matecconf/201818005002.

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The issue of interfering influence of traction vehicles on railway traffic control systems is a serious problem posing a threat to railway traffic safety. This issue is gaining in importance as more and more vehicles equipped with traction inverters are put into service. Current harmonics generated by traction vehicles equipped with voltage source inverters can be controlled in such a way that they do not exceed the limits imposed by railway operators. One of the current harmonic control techniques, proposed by the authors, is the use of a combination of SHE (Selective Harmonic Elimination) and SHM (Selective Harmonic Mitigation) techniques to control the traction voltage source inverter. In this article, the author present the results of investigations on the influence of supply voltage fluctuations on the efficiency of shaping techniques of the current harmonic spectra taken from the DC network by VSI traction drive system, using the SHE and SHM modulation techniques. Regarding the fact that in 3 kV DC electric traction systems, fluctuations of the vehicle's supplying voltage are accepted in a wide range, it is necessary to determine the influence of voltage changes on the proposed modulation techniques. The research object is a simulation model of traction drive which consisting of an asynchronous motor fed by a voltage source inverter. The simulation model was verified by the means of measurements performed at a low scale laboratory stand. Analysis of the tested techniques when supplying voltage is fluctuating, allows to evaluate their usefulness in real operating conditions. The results obtained for SHE and SHM techniques were compared with SPWM modulation.

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Sun, Peiliang, Kang Li, and Chen Xing. "A partial compensation scheme for MMC-based railway cophase power supply." Transportation Safety and Environment 2, no. 4 (August 25, 2020): 305–17. http://dx.doi.org/10.1093/tse/tdaa020.

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Abstract This paper presents a partial compensation scheme for V/v transformer cophase traction power supply in high-speed railway systems. The scheme compensates variable traction load current, and controls the current phase at the secondary side of the V/v transformer for power factor correction and negative sequence current reduction. To achieve this, the grid side current phase angles are optimized while satisfying the grid code on the power factor and voltage unbalance limits. The optimized phase angles are then used to design control references under varying load conditions. The compensation control action is updated regularly based on real-time measurements of the traction load, and the required currents are controlled by a 25-level single-phase back-to-back MMC power conditioner to achieve the compensation target. Static and dynamic load compensation performances are verified based on the simulation studies.

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Buonsanti, Michele, S. Calcagno, F. C. Morabito, and Mario Versaci. "Eddy Current and Fuzzy Inference to Control Defects Growth in Reinforced Concrete." Key Engineering Materials 345-346 (August 2007): 1291–94. http://dx.doi.org/10.4028/www.scientific.net/kem.345-346.1291.

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In reinforced concrete, when slits take places, the problem arises to control the growth of it. If the critical limit is exceeded due to further load increases, the final strength relies on the integrity of the tight rods. The ability of finding possible defects in these rods and in controlling the relevant growth is therefore of great importance in structural safety at the ultimate stage. In particular, thin reinforced concrete structures draw researchers attention to such a point that several theoretical models have been developed with the aim to reproduce with adequate reliability the real behaviour, taking into consideration the actual deformability, the rising and spreading of fissuring, together with the mechanisms and the loads leading to collapsing. In this work, an experimentation is carried out on a deflect less reinforced concrete specimen, which underwent to rising traction up to the fissuring. The employed investigation technique is an application of the well-known eddy current-based methodology. The magnetic fields maps which were got by this way constitute an electromagnetic representation of the tensional condition of the specimen at the different values of the applied traction, using the above mentioned experimental database, concerns the extraction of inferences to predict and assess the growth of defects in reinforced concrete elements similar to the employed specimen.

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Niu, He. "A Comparative Study of Over-Current Sensing for Traction Inverters." Active and Passive Electronic Components 2021 (January 21, 2021): 1–6. http://dx.doi.org/10.1155/2021/6678234.

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The over-current condition for a traction inverter can indicate flaws on control algorithms, interference on logic signals, hardware aging, or hardware misconduct. Thus, proper detection of over-current conditions during inverter operation is a critical item for inverter development and product validation. This paper reviews several widely used over-current detection methods and a few theoretically approved over-current detection methods. The main focus of this review includes the sensing bandwidth, sensing accuracy, and implementation complexity of the studied over-current detection methods. The advantages of those widely used methods and the application requirements for the theoretically and prototypingly approved methods are concluded by this review.

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Сулейманов, Р. Я., and И. Б. Падерина. "Features of rolling stock acceleration." Herald of the Ural State University of Railway Transport, no. 1 (2020): 75–81. http://dx.doi.org/10.20291/2079-0392-2020-1-75-81.

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The article is devoted to the issue of acceleration of passenger electric stock. According to the traffic schedule, the trains are to have rapid acceleration and braking determined by the acceleration. In itself, great acceleration does not cause great inconvenience to passengers. But to provide comfort for passengers, limiting of acceleration build-up is required. At contact-rheostat control traction force is maintained by step change of starting rheostats resistance in accordance with the speed increase. This results in stepped changes of thrust force, respectively, to impulsive loads. At impulsive control of the traction drive there is a possibility of smooth increase of traction motors current value and, therefore, of the traction force. It was proposed to increase the armature current by the linear law with transition to a constant value at the end of the process. However, at the end of the process there is a traction force push similar to an ice slide. The most natural is to increase the thrust force according to the exponential law. For this purpose, an intensity set unit is introduced, which is to change the armature current according to the mentioned law at step-by-step change of the task from the driver controller in arbitrary sequence. In the control unit operating in analog mode, the exponential law is created when charging the condenser the voltage of which is determined by a differential equation and is supplied to the input of the armature current regulator. In the digital control form, a direct solution to the differential equation is impossible because of the constant change in the initial conditions under the action of the driver controller. Therefore, it is proposed to solve the equation by the digital Euler method, and to develop a special programming method.

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Cheng, Peng, Chao Wu, Huiwen Kong, Frede Blaabjerg, and Yu Quan. "Connection and Control Strategy of PV Converter Integrated into Railway Traction Power Supply System." Energies 13, no. 22 (November 16, 2020): 5989. http://dx.doi.org/10.3390/en13225989.

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In order to supply the single-phase locomotive load and mitigate the negative sequence current, this paper develops a V/V transformer-based connection and control strategy of three-phase photovoltaic (PV) converters integrated into railway traction power supply systems. In this V/V transformer-based connection, the two-phase traction voltage is converted into the three-phase voltage. This approach can offer a common low voltage AC bus, which is more convenient for more access to three-phase PV converters. Based on this V/V transformer-based connection, an individual phase current control strategy with the hybrid current reference is fully designed. In this control strategy, the current reference, containing two parts, is generated. One is the asymmetrical part for powering the single-phase locomotive load and mitigating the negative sequence current. The other is the symmetrical part for feeding the surplus power back to the utility grid. Then, each phase current replaces the dual-sequence current to be controlled to track the corresponding phase current reference. Consequently, PV converters can flexibly inject the symmetrical and asymmetrical currents without the dual-sequence extraction for a simpler implementation. Finally, the effectiveness of the developed connection and control strategy is validated by the simulation studies.

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Wang, Yuan, Xiao Qiong He, Ze Liang Shu, Zheng Xiang Xu, and Ying Ying Zhou. "Study of Droop Characteristic in Advanced Co-Phase Traction Power Supply System." Applied Mechanics and Materials 380-384 (August 2013): 3118–23. http://dx.doi.org/10.4028/www.scientific.net/amm.380-384.3118.

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The disadvantages of two existing traction power supply modes are analyzed and advanced co-phase traction power supply system based on three-phase to single-phase converter is studied in the paper. Then, the chain model of network and the constant power model of locomotive are established. According to the above results, further analysis of the circulating-impedance and the feasibility study of droop control in this system are presented. The circulating-current analysis results of the advanced co-phase traction power supply system and the droop control of the system are given in the end of the paper.

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Marykyn, Aleksander, and Vasiliy Myroshenko. "The analysis of electromagnetic processes in reactive power compensation unit with variable inductance." Proceedings of Petersburg Transport University, no. 2 (June 20, 2017): 298–306. http://dx.doi.org/10.20295/1815-588x-2017-2-298-306.

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Objective: To analyze transient processes when activating reactive power compensation unit with variable inductance and load bounce in electric traction alternating current network. To determine reactive power control range for possible structural variations of a unit. To choose the most power efficient variant of mutual connection of controlled reactor and capacitor bank with uncontrolled capacity in reactive power compensation unit. To make a conclusion, concerning feedback device application in control system. Methods: Connection diagrams of a unit to an alternating current monophase network. Mutual connection diagrams of controlled reactor and capacitor bank were chosen. Structural variations’ control range analysis of reactive power compensation unit was conducted. In MATLAB Simulink software package, simulation of different bucking out system circuitry was fulfilled. Simulation of compensation unit functioning was carried out for one variant with load bounce in electric traction. Results: It was established that, in case of series connection of controlled reactor and capacitor bank, control range may comprise no more than 15 % of nominal capacity. Starting current of a unit reaches twofold value. Parallel connection makes it possible to control reactive power in a broad band. Starting current in this case reaches fourfold excess of value. It is suggested to use uncontrolled reactor successively with capacitor bank as an additional unit. Such a variant makes it possible to reduce starting current and simultaneously provide filtration of the third current harmonics. Practical importance: A series-parallel variant of compensation unit circuitry seems to be the most perspective for application in electric traction alternating current network.

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Тарасов, Алексей, Aleksey Tarasov, Дмитрий Конохов, Dmitriy Konokhov, Галина Федяева, Galina Fedyaeva, Татьяна Сморудова, and Tatyana Smorudova. "SIMULATION OF SYSTEM OF ENERGY EFFICIENT DOUBLE-AREA VELOCITY CONTROL IN ASYNCHRONOUS DRIVE WITH MOMENT DIRECT CONTROL." Bulletin of Bryansk state technical university 2016, no. 1 (March 31, 2016): 127–33. http://dx.doi.org/10.12737/18303.

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In the paper there are presented and tested energy-efficient algorithms of asynchronous drive control with the system of moment direct control on the basis of simulation. The algorithms are directed to the reduc-tion of stator current consumption and also to the maximum use of an engine on heating and power. With purpose of energy saving the electric drive system with direct moment control is supplied additionally with a special setting device of a stator flux linkage where the dependence of a stator flux linkage upon the moment of an asynchronous drive necessary to support an optimum angle between momentforming vectors is realized. A functional scheme of the system of an energy effective doublearea control of an asynchronous drive velocity with the direct control of a moment and an adjustable capacity limitation reflecting principles of functioning and an interrelation of system basic units is shown. To check-up the solutions offered there is developed a model of a traction electric drive system in the basic library of the bundled software Matlab Simulink, the results of its modeling confirm the effectiveness in the application of energy saving algorithms allowing the reduction of current consumption of the asynchronous traction electric drive by 7-10%

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Chen, Jian, Peng Li, Gangbing Song, and Zhang Ren. "Control of an innovative super-capacitor-powered shape-memory-alloy actuated accumulator for blowout preventer." Modern Physics Letters B 31, no. 01 (January 10, 2017): 1650426. http://dx.doi.org/10.1142/s0217984916504261.

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The design of a super-capacitor-powered shape-memory-alloy (SMA) actuated accumulator for blowout preventer (BOP) presented in this paper featured several advantages over conventional hydraulic accumulators including instant large current drive, quick system response and elimination of need for the pressure conduits. However, the mechanical design introduced two challenges, the nonlinear nature of SMA actuators and the varying voltage provided by a super capacitor, for control system design. A cerebellar model articulation controller (CMAC) feedforward plus PID controller was developed with the aim of compensation for these adverse effects. Experiments were conducted on a scaled down model and experimental results show that precision control can be achieved with the proposed configurations and algorithms.

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39

Yun, Chun‑Gi, Seunghoon Baek, Hanyoung Bu, Younghoon Cho, Jin‑Hyuk Park, and Myung‑Yong Kim. "Correction to: Simple current control without grid voltage sensor for traction solid‑state transformer." Journal of Power Electronics 21, no. 7 (May 17, 2021): 1107. http://dx.doi.org/10.1007/s43236-021-00258-0.

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40

Lingaitis, Leonas Povilas, and Lionginas Liudvinavičius. "ELECTRIC DRIVES OF TRACTION ROLLING STOCKS WITH AC MOTORS." TRANSPORT 21, no. 3 (September 30, 2006): 223–29. http://dx.doi.org/10.3846/16484142.2006.9638070.

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The paper considers the variation of circuit design of the electric drives in traction rolling stocks when traditional DC electric machines are replaced with AC electric machines. Simplified circuit diagrams of the electric drives using electric machines of non‐commutator type are offered. Operational defects of DC traction engines are weighed against some positive characteristics of direct current series excitation in traction engines, determining their extensive use in the electric drives of traction rolling stocks. However, the rapid development of semiconductor devices, e.g. thyristors and IGBT transistors, led to the creation of a great variety of semiconductor inverters. This made it possible to develop an autonomous three‐phase power supply system for diesel locomotives and algorithms for the AC traction motors and to obtain engine characteristics matching the tractive force by using voltage frequency and current inverters. A mathematical justification of the engine torque and tractive force control as well as its particular characteristics is provided. The graphs demonstrating the particular ways of changing the electrical parameters of an asynchronous motor with a squirrel‐cage rotor are also presented.

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41

Bejaoui, Fatah, Chokri Mechmeche, Ali Sghaier Tlili, and Hamed Yahoui. "Design and implementation of a hybrid control for the energy management system in electric traction." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 234, no. 10 (July 10, 2020): 1075–87. http://dx.doi.org/10.1177/0959651820932677.

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This article intends designing and implementing a hysteresis current controller for the energy management system within an electric traction to maintain the output voltage in a certain interval whatever the disturbances to the system. The energy management system within an electric traction encompasses a battery functioning as a fuel cell within the primary energy source, an ultracapacitor considered as an auxiliary source and two direct current to direct current converters renowned as boost and buck/boost converters, whose modeling is constantly contemplated as a very difficult task. As a matter of fact, these converters are designed as switching circuits with a prevalent change of structures, which makes them strongly nonlinear. Thereby, they can be assumed as hybrid dynamical systems whose continuous parts are especially characterized by electrical magnitudes, namely, the currents and voltages in the converters, and whose discrete part is illustrated by the high-frequency switching metal–oxide–semiconductor field-effect transistor which demands faster control mechanisms to ensure proper regulation of the output voltage of two direct current to direct current converters. The validity and effectiveness strategy control of the energy management system are highlighted by numerical simulation as well as by experimental implementation on the DSPACE1104 R&D Controller Board.

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42

Young, Jieh Shian, Yi Pin Lin, and Po Wen Shih. "Neural Network Approach to Gain Scheduling for Traction Control of Electrical Vehicles." Applied Mechanics and Materials 392 (September 2013): 272–76. http://dx.doi.org/10.4028/www.scientific.net/amm.392.272.

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This paper proposes a gain scheduling approach by neural network to force control of the electric vehicle wheels. To approximate to the reality in simulation, we utilize the traction force database of the motor, called the current-RPM-torque database, instead of the slip ratio measurements. The system is nonlinear and a constant gain cannot overcome all road conditions of the traction force control for the electric vehicles. The appropriate gains for different road conditions can be the training data of the neural network. In this paper, the proper parameters for the RBF neural network are obtained. The appropriate gains which have to fit the assigned specifications in time domain seem to be inverse proportion to the slip ratio slope.

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Safarov, Abdurauf, Khurshid Sattarov, and Sarvar Jumaboyev. "Device for conversion of equalizing current at the site of the traction ac network." E3S Web of Conferences 139 (2019): 01034. http://dx.doi.org/10.1051/e3sconf/201913901034.

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The article proposes the design of a device for converting the equalizing current using a compensating winding, which meets the requirements for accuracy and reliability on the part of various automated control systems, control and measurement of currents.

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44

Bublik, Vladimir Vasilyevich, Oleg Vladimirovich Gatelyuk, Nikolay Vasilyevich Esin, Viktor Alexandrovich Smirnov, and Oleg Dmitrievich Yurasov. "Condition analysis of existing technological process for repair of electric traction motors of direct current freight locomotives with the use of theory of network planning and control." Transport of the Urals, no. 2 (2020): 70–74. http://dx.doi.org/10.20291/1815-9400-2020-2-70-74.

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The paper provides information about the experience of using network schedules in the conditions of service locomotive depots that contribute to the observance of logical discipline in planning, drawing up calendar plans and managing repair work to restore traction engines of 2ES6 series of freight electric locomotives, as well as a set of measures to optimize the technological process of traction engines repair in the volume of TR-600. The analysis of the existing technological process of repair of traction engines allowed to reveal features of distribution of time of each operation in branches of the network schedule with identification of time parameters of volumes of repair of its separate nodes, and also to justify reserves allowing to accelerate carrying out planned repairs of traction engines in volume of TR-600 of the electric locomotive. The results obtained can be used in service locomotive depots when justifying measures to optimize the technological process of repair of electric locomotives in order to reduce the time and economic costs of repairing electric locomotives 2ES6.

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Steczek, M., A. Szeląg, and D. Chatterjee. "Analysis of disturbing effect of 3 kV DC supplied traction vehicles equipped with two-level and three-level VSI on railway signalling track circuits." Bulletin of the Polish Academy of Sciences Technical Sciences 65, no. 5 (October 1, 2017): 663–74. http://dx.doi.org/10.1515/bpasts-2017-0071.

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Abstract Electric traction vehicles cooperating with a 3kV DC traction system and equipped with drive systems based on voltage source inverters are the most significant sources of disturbances for a railway signalling system. Every traction vehicle to be authorised for operation on railway lines must fulfil the limits imposed on current harmonics magnitudes and those provided by railway operators. The solution introduced for prototypes of most modern traction drives is to replace the two-level inverters with three-level topology. Therefore, it is essential to establish the influence of the new solution on the railway signalling system. This paper presents a comparative analysis between simulation results delivered for two and three-level traction drive system regarding generation of disturbing current harmonics. Two types of VSI modulation techniques were taken under consideration: sinusoidal PWM (SPWM) and a new one, proposed by the authors, based on selective harmonic elimination (SHE). Furthermore, the authors presented application of one of the SHE based optimization techniques for shaping the EMU’s (electric multiple unit) DC side input current harmonics spectrum in order to meet the required limits. The described technique is based on off-line generation of a set of solutions for each of the VSI operating points and selection of the best solution for the assumed criteria. The applied simulation models and the concept of SHE control were verified in a laboratory by means of a low-power drive stand. Using the three-level inverter in traction drives system results in less current harmonics than using two-level topology without modification of the modulation technique. Thus, it does not guarantee fulfilling all limits assumed in this paper. The proposed modulation technique allows for fulfilling the limits, and the technical implementation of the proposed technique in a traction drive system will be considered in future studies.

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Fang, Xiaochun, Zhongbei Tian, Zhongping Yang, Fei Lin, and Pietro Tricoli. "Simple current control of permanent magnet synchronous machines for railway traction operating in six‐steps." IET Electric Power Applications 14, no. 13 (December 2020): 2640–47. http://dx.doi.org/10.1049/iet-epa.2020.0106.

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Jiang, Wenying, Qiqi Guo, and Zhen Zhang. "Study of Excitation Characteristics of Traction Machine/Drive Systems." Energies 13, no. 1 (December 27, 2019): 151. http://dx.doi.org/10.3390/en13010151.

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In order to accurately evaluate the performance of a traction machine/drive system, it is necessary to have an accurate excitation source which considers current harmonics. In this paper, four machine/drive systems with different excitation sources have been modeled, simulated, and studied to evaluate the effects on permanent magnet synchronous machines (PMSMs) from different perspectives. In Model I, the excitation is an ideal sinusoidal current source with no harmonics. Model II is excited by an ideal sinusoidal voltage source regardless of the pulse width modification’s (PWM’s) influence. Model III takes into account the influence of current harmonics under space vector pulse width modulation (SVPWM) control. Model IV is based on the equivalent circuit extraction (ECE) model (a look-up table motor model). We simulate these four models and study the characteristics of the excitation sources, based on the observations of current harmonics, torque, electromagnetic force, computation time, and efficiency. Experiments are also conducted to show that Model III allows the most precise study of the considered system. Model IV is a good substitution, providing similar results with a shorter running time.

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Yin, Jintian, Yongfang Xie, Tao Peng, Chunhua Yang, and Zhiwen Chen. "Current Characteristics Analysis and Fault Injection of an Early Weak Fault in Broken Rotor Bar of Traction Motor." Mathematical Problems in Engineering 2018 (October 10, 2018): 1–8. http://dx.doi.org/10.1155/2018/4934720.

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Aiming at the destructive and irreversible problems of the broken rotor bar fault of the traction motor, the current characteristics of the early weak fault of the single bar are analyzed, and the broken rotor bar fault simulation injection is realized on the experimental platform. Firstly, a damage factor from the change rule of the metal resistance value of a rotor bar is defined. By means of such a damage factor, the relationship between the severity of the fracture of a single rotor bar and the phase resistance of the traction motor was obtained. Through the superposition principle, the traction motor in the fault of the rotor bar was regarded as a normal motor in which the reverse current source was superimposed on the fault rotor bar. The characteristic values of the stator current fault component were obtained when the single bar had broken. Finally, the relationship between the fault characteristics component of the stator current and the fracture severity of the single rotor bar was established. On this basis, on hardware-in-the-loop fault injection benchmark of the traction drive control system based on dSPACE, the gradual injection of early weak faults in the early broken rotor bar was carried out and the results were analyzed. The experimental data demonstrated the correctness of the current characteristics analysis and fault injection.

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Hu, Hong Sheng, and Juan Wang. "Model Reference Adaptive Control for Magnetorheological Damper Subjected to High Impact Load." Advanced Materials Research 301-303 (July 2011): 436–41. http://dx.doi.org/10.4028/www.scientific.net/amr.301-303.436.

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Using the developed hardware-in-the-loop simulation platform for weapon system under impact load excitation and a novel large-scale single-ended MR damper without the accumulator, impact tests for the special designed long-stroke magnetorheological recoil damper were done and its dynamic performances under different impact loads and input current were examined in this paper. Model of damping force was established by using the model reference adaptive control method. Its dynamic performances of MR damper under model reference adaptive control strategies were analyzed by numerical simulations and tests. Experimental results show that the model reference adaptive control method could reduce its peak value of recoil damping force to 27.33% and its peak value of stroke to 48.75%, and its adjustability of damping force could be well applied for its impact resistance design of gun recoil mechanism.

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Radu, Petru Valentin, and Adam Szeląg. "Modelling of operation of a stationary energy storage device in metro rail transport for selection of its parameters." MATEC Web of Conferences 180 (2018): 02011. http://dx.doi.org/10.1051/matecconf/201818002011.

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The paper presents a Simulink model of a DC metro traction supply system with a stationary energy storage device (SESD). The simulation model consists of traction substations, a train model, and an energy storage device (ESD) with supercapacitors (SC). A new energy management strategy considering the line voltage and current, SC state of charge (SOC) and SC charging and discharging current is proposed. This method can improve the energy savings and manage the remaining energy. Simulation results provided in this paper justify the control method. The proposed model can be used with different ESD, such as batteries.

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Journal articles on the topic 'Current control of the traction accumulator'

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