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Journal articles on the topic 'Thyristor converters Automatic control'

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Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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1

Kuznetsov, V. A., G. D. Polkovnikov, V. E. Gromov, V. A. Kuznetsova, and O. A. Peregudov. "High power current pulse generator based on reversible thyristor converter." Izvestiya. Ferrous Metallurgy 62, no. 12 (January 15, 2020): 964–71. http://dx.doi.org/10.17073/0368-0797-2019-12-964-971.

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In metal forming using high power current pulses, it becomes necessary to control both reproduction frequency and pulse amplitude. Description of a generator of high power current pulses with controlled thyristor converter is provided as a power source of charging device (charger) for regulating voltage (pulse amplitude) of capacitor charge. Faults of the generators associated with inrush current in capacitor charge modes are revealed, which reduces quality of supply network. To reduce time of transient processes while lowering voltage across capacitors, application of reverse thyristor converter is applied as a power source. Structural diagram of generator is considered, which includes reversible thyristor converter with separate control, power unit, capacitor recharge device, charger parameters automatic control system and capacitor charge process control system. Calculation of parameters of automatic control system regulators is presented. To obtain optimal transients, standard methodology for setting regulators to a modular optimum was used. In order to reduce overshoot at time of disturbances appearance, which can reach 100 % and higher, socalled logical device was introduced into the automatic control system. It blocks control pulses on thyristors of converter and simultaneously reduces signal at the output of current regulator to zero. Simulation model of high power current pulse generator in MatLab – Simulink environment was synthesized. Analysis of the model was carried out, and graphs are given that explain principle of device operation and transition processes under various operating modes. Generator application will allow user to adjust amplitude of current pulses with high speed and to obtain sufficiently high-quality transient processes of capacitors charge (discharge), which will have beneficial effect on supply network. Application of better converters will significantly increase frequency of reproduction of current pulses.
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2

Lei, Zhaoyu, Jianyi Guo, Yingfu Tian, Jiemin Yang, Yinwu Xiong, Jie Zhang, Ben Shang, and Youping Fan. "Thyristor Aging-State-Evaluation Method Based on State Information and Tensor Domain Theory." Electronics 10, no. 21 (November 5, 2021): 2700. http://dx.doi.org/10.3390/electronics10212700.

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The thyristor is the key device for the converter of the ultra-high-voltage DC (UHVDC) project to realize AC–DC conversion. The reliability of thyristors is directly related to the safe operation of the UHVDC transmission system. Due to the complex operating environment of the thyristor, there are many interrelated parameters that may affect the aging state of thyristors. To extract useful information from the massive high-dimensional data and further obtain the aging state of thyristors, a supervised tensor domain classification (STDC) method based on the adaptive syn-thetic sampling method, the gradient-boosting decision tree, and tensor domain theory is proposed in this paper. Firstly, the algorithm applies the continuous medium theory to analogize the aging state points of the thyristor to the mass points in the continuous medium. Then, the algorithm applies the concept of the tensor domain to identify the aging state of the thyristor and to transform the original state-identification problem into the state classification surface determination of the tensor domain. Secondly, a temporal fuzzy clustering algorithm is applied to realize automatic positioning of the classification surface of each tensor sub-domain. Furthermore, to solve the problem of unbalanced sample size between aging class data and normal class data in the state-identification domain, the improved adaptive synthetic sampling algorithm is applied to preprocess the data. The gradient-boosting decision tree algorithm is applied to solve the multi-classification problem of the thyristor. Finally, the comparison between the algorithm proposed and the conventional algorithm is performed through the field-test data provided by the CSG EHV Power Transmission Company of China’s Southern Power Grid. It is verified that the evaluation method proposed has higher recognition accuracy and can effectively classify the thyristor states.
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3

Tarasovsky, Timofey S., and Arnold O. Limberg. "System of contactless automatic voltage regulation of BARN with thyristor-reactor switching device." Innotrans, no. 2 (2021): 49–53. http://dx.doi.org/10.20291/2311-164x-2021-2-49-53.

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The functional scheme of a closed system of contactless automatic voltage regulation of a converter unit with a thyristor-reactor switching device TRSD for voltage regulation is considered. The proposed external characteristics of the converter unit with the BARN and TRSD system when using the TRSNP-12500/10 converter transformer are presented. An algorithm for generating a control signal for an executive controlled thyristor – reactor switching device by the controller of the system – the SHAUN 6 cabinet-is considered, based on which the stable external characteristics of the converter are implemented on a laboratory physical model of a converter unit with a 30 kVA converter transformer.
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4

Melnykov, V. "DESIGN OF THE POWER TRANSISTOR ENERGY CONVERTERS FOR AUTOMATED DC-DRIVE SYSTEMS." Electromechanical and energy saving systems 2, no. 53 (2021): 31–39. http://dx.doi.org/10.30929/2072-2052.2021.2.54.31-39.

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Purpose. One of the integral parts of modern mechatronic motion modules, where electric motors provide the conversion of electrical energy into useful mechanical action, are power semiconductor converters. At the current stage of industrial development, the use of energy converters as a part of a fully controlled semiconductor switches opens wide opportunities for the development and implementation of highly efficient resource- and energy-saving devices. Methodology. Two types of converters are widely used in automated DC electric drive systems: controlled thyristor rectifiers and pulse-width DC converters, the principle of operation of which is based on the key mode of operation of the regulating semiconductor, which periodically connects the source voltage to the output circuit. The paper presents a laboratory sample of a power semiconductor DC energy converter, which can ensure reliable motor operation in both motor and braking modes. Results. The presented transistor energy converter consists of two main parts: the first part performs the main role – control, and it includes a control unit, a microcontroller, and a device for displaying current information. The second part is a power module, which includes the necessary power supply modules, control drivers and power transistor switches of the converter. To obtain high quality transients of the electric drive system, the circuit is equipped with additional sensors of current, voltage and speed, which takes part in the formation of the control signal and in the protection systems against overvoltage and current jumps. Practical value. The paper substantiates the parameters of the components and proposes developed technical solutions for the construction of a microprocessor control system for a transistor DC energy converter. It is shown that in order to ensure a constant generator mode in automated electric drive systems, where the primary energy converter is an uncontrolled rectifier, it is expedient to install an energy discharge circuit in the DC link. References 18, figures 14.
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5

Metelkov, Vladimir P., and Yakov L. Liberman. "Сhoosing the Belt Conveyor Start Mode." Electrotechnical Systems and Complexes, no. 2(43) (June 28, 2019): 54–59. http://dx.doi.org/10.18503/2311-8318-2019-2(43)-54-59.

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The paper is concerned with the problems associated with starting a long conveyor driven by an induction motor. We consider the dynamic loads in the conveyor belt during start-up, which cause slippage of the conveyor belt on the traction drum leading to its premature deterioration. The relevance of the topic is associated with the high cost of the conveyor belt reaching 60% of the cost of the entire conveyor and more. The aim of the work is to ascertain the possibilities of reducing the wear of the conveyor belt, for example, through the use of the possibilities provided by the system of the electric drive. The possibility of reducing the probability of the conveyor belt slippage by increasing the initial belt tension is noted. However, constant high tension also accelerates belt deterioration. To solve this problem, the use of automatic tension control devices is proposed, as well as the reduction of dynamic loads in the belt by using soft starters based on a thyristor voltage converter, which regulates the amplitude of voltage on the motor stator. The features of an asynchronous motor heating when starting with a constant speed of rotation of the magnetic field are discussed. The interrelation between the start-up duration and the motor stator winding heating with the dynamic loads occurring in the conveyor belt in start-up modes is considered. Modeling results obtained using the Simulink package are presented. Since long start-up modes of asynchronous electric drives based on thyristor voltage converters can lead to motor overheating, especially when the conveyor is restarted under full load and in hot climates, it is advisable to use automatic conveyor belt tension control devices during start-up modes thereby reducing premature belt deterioration together with a decrease in the conveyor motor heating.
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6

Wang, Qin. "Design on AC/DC Converter Based on DSP56000 Processor." Applied Mechanics and Materials 539 (July 2014): 523–26. http://dx.doi.org/10.4028/www.scientific.net/amm.539.523.

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On the basis of incomplete three function mathematical principle, the method of using three point interpolation and undetermined coefficient can solve control circuit equation, which can realize the automatic conversion circuit of the AC/DC current, to achieve very good automatic control effect. In order to verify the effectiveness and reliability of the mathematical model, this paper designs twelve pulse thyristor full wave circuit current conversion experiment, the core of circuit analysis uses Web circuit computer online control system and Motorala development DSP56000 processor, and using the RAM port and the bus carry out communication. Finally, the system is introduced the design of Internet Web ideological and political education platform, to provide the technical support for the ideological and political Internet online education.
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7

Goun, Valentina S., Aleksandr S. Anikin, and Aleksey A. Bakin. "Experimental determination of suboptimal parameters for energy-efficient control of an induction motor." International Journal of Power Electronics and Drive Systems (IJPEDS) 11, no. 4 (December 1, 2020): 2173. http://dx.doi.org/10.11591/ijpeds.v11.i4.pp2173-2182.

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The article presents the results of experimental studies of the automatic speed control system (ASCS) of an induction motor (IM). Preliminary experimental studies have shown that the stator current minimum (power factor) is a suboptimal criterion. Optimal in terms of control is the rated power factor. Tests of IM with a thyristor voltage converter (TVC), as a power source, were conducted on an installation created at the department. A mathematical model of ASCS IM corresponding to the experimental setup has been developed. To determine the main functional dependences of IM, such as stator voltage, stator current, power factor, torque on the shaft, a program for approximating experimental data by polynomials was developed. Using the developed mathematical model, the regulatory characteristic of IM that was optimal from an energy point of view was obtained. The necessary indicators of IM and TVC are determined (thyristor control angle, stator voltage, stator current) to change existing settings in order to save electric energy. The results of experimental studies are presented, the graph shows an optimized version of the form of the regulatory characteristic according to the criterion of minimum electric energy consumption.
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8

Grabovskii, Vladimir. "Estimation of Damage Rotor Shaft of Turbogenerators with a Diode Brushless Excitation System." Известия высших учебных заведений. Электромеханика 64, no. 4-5 (2021): 90–98. http://dx.doi.org/10.17213/0136-3360-2021-4-5-90-98.

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The damage to the rotor shafts of high-power turbo generators is estimated as a result of the resonant in-teraction between the generator and the exciter caused by the operation of the automatic excitation regulator (AER) by mathematical modeling. The analysis covers turbo generators with a capacity of 300 to 1000 MW with a diode brushless excitation system (DBES). The simulated circuit includes a turbo generator with a block transformer, a power transmission line, an exciter in the form of a reversed synchronous generator with a rotat-ing rectifier diode converter unit, a static thyristor converter, and a sub-exciter in the form of a synchronous machine with permanent magnets. When modeling the electrical part, an approach is used from the positions of its own coordinates, which ensures maximum methodological consistency of the models of the listed devices and allows directly reproducing resonant phenomena at torsional vibration frequencies with the determination of instantaneous values of currents, voltages and electromagnetic moments of the turbo generator and exciter. The mechanical system is presented taking into account the exciter and sub-exciter as a seven-mass system. AER is introduced into the mathematical model by means of transfer functions with corresponding coefficients and time constants. The control system of the thyristor converter is represented in the model by a generator of line-arly increasing signals, a body for comparing these signals with the signal from the AER and a control pulse generator. To assess the damage rate, the deformation criterion for soft and hard loads in the zone of low-cycle fatigue and the force criterion in the zone of multi-cycle fatigue were used. A comparative quantitative assess-ment of the damage in the neck of the G-E shaft line in the resonant interaction between the exciter and the generator with different automatic excitation control systems is given. The influence of attenuation of electro-magnetic transients and damping of torsional vibrations on the damage values is analyzed. The results ob-tained can be used to analyze the functioning and determine the settings of the AER.
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9

Afanasev, Sergey, and Alexandr Pakhomov. "Current Limitation in the DC Electric Drive System with Modal Control and Variable Structure." Известия высших учебных заведений. Электромеханика 65, no. 4 (2022): 58–63. http://dx.doi.org/10.17213/0136-3360-2022-4-58-63.

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An effective method of current limitation in the DC electric drive closed system with modal control under various op-erating modes of the electric motor has been developed and investigated. The control object is the DC motor of inde-pendent excitation, powered by a thyristor converter. The automatic control theory methods were used to solve the problem. The method of current limitation of the DC motor armature circuit in a closed system with modal control and variable structure has been studied. The coefficients synthesis of the modal current controller and the rotation speed of the DC motor armature has been made. The simulation of transient processes of starting, braking, reversing and stopping the DC motor has been carried out. The control process quality is assessed by analyzing the transients of a closed electric drive system in the MatLab dynamic systems modeling environment. Recommendations are given on the parameter choice of relay links to ensure the effective current limitation. The operability of the electric drive system was checked with the engine parameters being varied. In general, the proposed current limiting method copes with its task successfully though being sensitive to the relay elements settings.
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10

Rudykh, A. V., and S. V. Sukyasov. "Power control of electric heating elements using thyristor voltage and resistance converters." iPolytech Journal 26, no. 2 (July 6, 2022): 310–19. http://dx.doi.org/10.21285/1814-3520-2022-2-310-319.

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This article investigates the energy efficiency of thyristor converters with an active load. The conversion of electric energy in a “thyristor converter – electric heating element” installation is considered from the standpoint of electromagnetic theory. The energy characteristics of the considered installation was calculated in the MATLAB environment. When thyristor voltage converters are operated under the mode of controlling the power of active load, passive power was found to be generated at the input during the non-conductive state of the converter (thyristor is locked). The use of passive power allows additional thermal energy to be obtained by means of an extensive use of voltage, without increasing the current consumption. An increase in the depth of power control of electric heating elements by thyristor voltage converters leads to a significant increase in passive power. In the active power control range (50–100% of the nominal value), the factor accounting for variations in the total power in the converter due to an incomplete use of the voltage at the input of the considered installation decreases from 1.0 to 0.93. This reduces the power factor of the load converter from 0.97 to 0.925. Despite the high value of the load power factor (in the control interval 0–50% of the rated power value), the factor accounting for variations in the total power was found to be reduced to 0.66. As a result, the power factor of the converter with the load is reduced by ~ 33%. In order to increase the efficiency of converting electrical energy to control the active load power, it is proposed to use thyristor resistance converters that vary the electrical resistance of the load over time. It is shown that unsatisfactory operation of a thyristor voltage converter can be caused by inefficient use of voltage at the input of the “thyristor converter – electric heating element” installation. When using thyristor resistance converters, the current non-sinusoidality factor does not exceed 1.5 % and the voltage non-sinusoidality factor in a 0.38 kV network does not exceed 0.2 %.
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11

BENEDETTI, MARIO, and CARLOS F. CHRISTIANSEN. "Universal microprocessor controller for thyristor phase control of multiphase converters." International Journal of Electronics 62, no. 3 (March 1987): 385–92. http://dx.doi.org/10.1080/00207218708920989.

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12

Mendybayev, Sergazy, Yermek Sarsikeyev, and Dameli Kapanova. "Control of Valve Converters with Natural Current Characteristics." MATEC Web of Conferences 155 (2018): 01047. http://dx.doi.org/10.1051/matecconf/201815501047.

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The article considers the valve converter with a natural current characteristic, which is called the current of parametric, for which the primary is not the source of the electric force but a parametric source of current, to the output of which connected to the counter-parallel thyristor sets assembled on the bridge scheme. The control of thyristors in the current converter is carried out taking into account the characteristic features of the parametric source, to avoid overvoltage on its reactive elements, analyzed algorithmic and modulating functions of the system borne temporary diagrams.
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13

Benedetti, M., and G. Uicich. "New high-performance thyristor gate control set for line-commutated converters." IEEE Transactions on Industrial Electronics 46, no. 5 (1999): 972–78. http://dx.doi.org/10.1109/41.793346.

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14

Luo, F. L., and R. J. Hill. "Minimisation of interference effects in thyristor converters by feedback/ forward control." Transactions of the Institute of Measurement and Control 7, no. 4 (July 1985): 175–82. http://dx.doi.org/10.1177/014233128500700402.

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15

Chikirkin, Oleg V. "Development of an Algorithm for Defining Thyristors Opening Angle Value at the New Configuration of Grid Commutation of Reversible Converter Arms of Electric Locomotive." Journal of Siberian Federal University. Engineering & Technologies 14, no. 8 (December 2021): 903–13. http://dx.doi.org/10.17516/1999-494x-0361.

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The article presents a new approach in the application of a diode discharge arm which is aimed at increasing the energy indicators of traction mode of AC locomotives. The method implies the utilization of electromagnetic energy stored in the commutate current circuit for closing exhausted thyristor arms of traction converters through a buffer contour provided by the discharge arm. A mathematical simulation of electromagnetic processes of the standard and proposed converters has been performed. The analysis of the results allows to find the most optimal value of thyristor arms opening angle when the discharge arm closes fully the exhausted thyristor arms in compliance with the condition of increasing the power factor of the electric locomotive. The developed control method of the proposed converter is presented by a table of pulses fed to the thyristors electrodes, as well as by the algorithm of point-of-time calculation of the impulses generation
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16

Usmonov, E. G., D. S. Akhmetbaev, M. Mamutov, Sh Abdurakhmonov, and M. Turgunov. "Application of an auto-parametric circuit for controlling thyristor converters." E3S Web of Conferences 289 (2021): 07015. http://dx.doi.org/10.1051/e3sconf/202128907015.

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This article discusses the issues of excitation of second-order subharmonic oscillations, in circuits representing a two-core electro-ferromagnetic circuit with a capacitive load, in order to use it to control the states of thyristors, frequency converters. The stability of the solutions of the equations of the two-core chain is investigated. Recommendations are given for obtaining stable subharmonic oscillations of the order 1/2 f when using these circuits as a control element of thyristor frequency dividers by two.
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17

Hill, R. John, and Fang L. Luo. "Current Source Optimization in AC-DC GTO Thyristor Converters." IEEE Transactions on Industrial Electronics IE-34, no. 4 (November 1987): 475–82. http://dx.doi.org/10.1109/tie.1987.351009.

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18

Srdic, Srdjan, and Milos Nedeljkovic. "Predictive Fast DSP-Based Current Controller for Thyristor Converters." IEEE Transactions on Industrial Electronics 58, no. 8 (August 2011): 3349–58. http://dx.doi.org/10.1109/tie.2010.2089941.

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19

Khaychenko, I. A., V. V. Babenko, Yu V. Nefedov, and Anh Tu Ha. "Algorithm for reducing additional losses in asynchronous electric drives in plants with static power regulators." Proceedings of Tomsk State University of Control Systems and Radioelectronics 23, no. 4 (December 25, 2020): 93–98. http://dx.doi.org/10.21293/1818-0442-2020-23-4-93-98.

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The ways to reduce losses of electrical energy in power supply systems of industrial enterprises containing powerful semiconductor converters and asynchronous motors are considered. The source of additional electric power losses related to subharmonic nature of voltage fluctuations from operation of converters using the principle of frequency-pulse control is determined. The operation algorithm for thyristor switches of semiconductor converters is proposed, that provides reduction of electric power losses in asynchronous motors connected in parallel with powerful converters. The voltage graphs and currents of simulation model in operation modes of converters show the potential to increase energy efficiency of operation of a wide range of industrial objects with asynchronous motors, connected in parallel and having cyclically changing load.
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20

Luo, Fang Lin, and Roland John Hill. "System Optimization---Self-Adaptive Controller for Digitally Controlled Thyristor Converters." IEEE Transactions on Industrial Electronics IE-33, no. 3 (August 1986): 254–61. http://dx.doi.org/10.1109/tie.1986.350231.

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21

Luo, Fang L., and Roland J. Hill. "Fast Response and Optimum Regulation in Digitally Controlled Thyristor Converters." IEEE Transactions on Industry Applications IA-22, no. 1 (January 1986): 10–17. http://dx.doi.org/10.1109/tia.1986.4504675.

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22

Savenko, A. E., and P. S. Savenko. "Features of operation of ship electrical power systems with electrical propulsion systems." Power engineering: research, equipment, technology 24, no. 3 (June 14, 2022): 91–100. http://dx.doi.org/10.30724/1998-9903-2022-24-3-91-100.

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THE PURPOSE. Consider the issue of the presence of distortions in the form of sinusoidal voltage and current in autonomous electrical power systems with electrical propulsion systems, built on the principle of the unified electric power system. Compare the results of the study of voltage distortion for electrical power systems with electrical propulsion systems of various structures and give recommendations for their application.METHODS. For research, unified electric power systems with DC electrical propulsion systems on the Yeysk ferry and alternating current on the asymmetric icebreaker Baltika are considered. The possibilities of programming with frequency control of modern drives of rudder propellers with AC motors are analyzed.RESULTS. Oscillograms of voltages and currents of generators were obtained using thyristor converters and inverters to control electrical propulsion systems in various modes. Significant ripples and distortions of the sinusoidal voltage and generator currents were noted when thyristor converters are used to power DC propulsion electric motors. Also, small deviations from the sinusoidal form of the ship's network voltage were recorded when inverters were used to control AC propulsion motors as part of rudder propellers.CONCLUSION. The issue of ensuring the quality of electricity produced in autonomous electrical power systems of sea vessels is of great relevance and importance. To ensure the best results, it is advisable to use azimuthing podded drive with AC electric motors, the rotation speed of which is implemented by inverter frequency converters with a DC link.
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23

Lale, Srđan, Mihajlo Obrenović, and Slobodan Lubura. "Realization of Hardware-in-the-loop Simulator of Thyristor-based Power Electronics Converters." IFAC-PapersOnLine 55, no. 4 (2022): 280–85. http://dx.doi.org/10.1016/j.ifacol.2022.06.046.

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24

Vasilev, B. U., and D. V. Mardashov. "Automatic control in multidrive electrotechnical complexes with semiconductor converters." Journal of Physics: Conference Series 803 (January 2017): 012170. http://dx.doi.org/10.1088/1742-6596/803/1/012170.

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25

Golovko, Sergey Vladimirovich, Artem Vladislavovich D'yachenko, and Nickolay Gennadievich Romanenko. "Comparative analysis of thyristor schemes of marine DC motor control." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2020, no. 2 (May 22, 2020): 111–19. http://dx.doi.org/10.24143/2073-1574-2020-2-111-119.

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The article considers the problem of the DC motors control that are often used in many electric drive systems. Due to the progress of industrial electronics and technology it has become possible to develop more efficient motor control circuits. The conventional speed control methods commit power losses in the system, which can be minimized by using the power electronics strategy. There is considered the thyristor control of DC motors of the ship electric drive. The DC motor control systems are described and simulation models in the MATLAB Simulink program are presented. The thyristor methods for controlling a DC motor speed are listed: single-phase semi-controlled converter (for motors with power up to 15 kW); single-phase drive with a controlled converter (available to operate in two quadrants); three-phase semi-controlled converter; three-phase controlled converter; single-phase reverse converter realized by connecting two single-phase converters (ensuring multi-mode operation); three-phase reverse converter realized as a single-phase converter. The mechanical characteristic of a DC motor was illustrated when the voltage supplied to the armature winding changed. It has been stated that control of the armature voltage is more favorable for speeds below the rated speed; flow control is preferable for speeds above the nominal speed. It has been inferred that speed control by means of power electronics devices provides large energy savings, in contrast to the traditional speed control methods, since the traditional methods experience significant energy losses.
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26

Jeftenic, Borislav, Milan Bebic, Miodrag Milojevic, and Mario Belincevic. "New drive and control concept of the paper-board machine at the board factory "Umka"." Chemical Industry 58, no. 5 (2004): 240–45. http://dx.doi.org/10.2298/hemind0405240j.

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This paper describes the reconstruction of the drives of a paper machine for the press and drying part of the machine during June, 2001, as well as the expansion of the paper machine with a "third coating" during July, 2002 at the board factory "Umka". The existing old drive of the press and the drying groups was realized as a 76 meter long line shaft drive. The coating section of the machine was realized with sectional drives with DC motors fed from thyristor converters. The concept of the new drive is based on standard squirrel cage induction motors, fed from frequency converters. The system is controlled by a programmable logic controller. The communication between the controller, frequency converters and control panels is realized with a profibus protocol. The Laboratory for Electric Drives, of the Faculty of Electrical Engineering, Belgrade, was contracted for the drive part of the reconstruction of the paper-board machine. The complete project, supervision of the work of the investor's own technical services and final commissioning of the drives were organized in such a way that the drives were changed during the planned periods for the repair of the machine.
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27

Kobori, Yasunori, Jing Li, Yi Fei Sun, Minh Tri Tran, Anna Kuwana, and Haruo Kobayashi. "Automatic Current Balance for Multi-Phase Switching Converters with Ripple Control or Soft Switch." Advanced Engineering Forum 38 (November 2020): 143–56. http://dx.doi.org/10.4028/www.scientific.net/aef.38.143.

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This paper proposes a new multi-phase switching converter with atuotomatic current barance technique. It is well-known that the multi-phase switching converter is suitable to handle large output current with small output voltage ripple for the buck converters which use the clock pulse. This paper investigates a multi-phase controlled method for the ripple-controlled converters and the soft switching converters, that use no clock pulse; for this reason, these converters are difficult to realize multi-phase converter configurations. There are some multi-phase hysteretic controlled converters; they utilize a main clock generator or an external sub-clock pulse, which has the master-slave synchronization method. But it is difficult to respond to a frequency change of the master converter. These multi-phase converters have not considered the imbalance among phase currents caused by variations of inductors and semiconductor switches in the power stage. For the commercialized multi-phase Voltage Regulating Modules (VRMs), the inductors and the semiconductor switches are selected to adjust the balance among the phase currents. However, there is no multi-phase soft switching converter.Then we have developed the multi-phase ripple-controlled converter and the multi-phase soft switching converter with the technique of detecting 180-degree from the variable operating frequency of the main converter. Moreover, in these converters, there appears the current imbalance because of the element variations among inductors and capacitors, if some cares are not taken there. Then we have developed the automatic correction for the current imbalance by modifying the width of the Constant On Time (COT) pulse or modifying the slope of the saw-tooth signal.
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28

Jalili, K., N. Weitendorf, and S. Bernet. "Behavior of PWM Active Front Ends in the Presence of Parallel Thyristor Converters." IEEE Transactions on Industrial Electronics 55, no. 3 (March 2008): 1035–46. http://dx.doi.org/10.1109/tie.2008.917079.

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29

Shu, Liu Yan, and Yan Pin Ning. "Straightness Apparatus in the Automatic Control Design Deep Hole." Applied Mechanics and Materials 130-134 (October 2011): 684–86. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.684.

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In this paper, the instrument is designed by basing on principle of the measurement method of straightness error measurement of deep hole, the design technologies of A/D converters, automatic control and computer are used. The instrument can automatically acquire data, the process of acquire data is convenient, fast, safe and the data is reliable.
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30

Kovalova, Yuliia, Victor Kovalov, and Irina Shcherbak. "Reactive Power of Asynchronous Electric Drives with Semiconductor Converters." Lighting engineering and power engineering 60, no. 1 (April 30, 2021): 9–14. http://dx.doi.org/10.33042/2079-424x.2021.60.1.02.

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The purpose of the article is to obtain a ratio for determining the reactive power of induction motors when powered by semiconductor converters. The task is to determine the dependence of reactive power on control parameters of the converters. The research method used is computer simulation of electric drive based on Fryze power theory for non-sinusoidal currents. The result is the obtained expression for the calculation of reactive power, which takes into account the rated idle current of the motor with sinusoidal power supply and the type of converter, due to introducing special coefficients. Numerical values of the latter, depending on the control parameter, are obtained on computer models with their subsequent approximation. The scientific novelty of the research is in the further development of Fryze power theory in the direction of decomposition of non-sinusoidal current components using computer models. The practical significance is the obtained expression for determining the reactive power of an asynchronous electric drive with a thyristor voltage converter, on the basis of which the capacity of compensating capacitors is calculated to increase its energy efficiency.
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31

Szymański, Zygmunt. "Intelligent, Energy Saving Power Supply and Control System of Hoisting Mine Machine with Compact and Hybrid Drive System / Inteligentne, Energooszczędne Układy Zasilania I Sterowania Górniczych Maszyn Wyciągowych Z Napędem Zintegrowanym Lub Hybrydowym." Archives of Mining Sciences 60, no. 1 (March 1, 2015): 239–51. http://dx.doi.org/10.1515/amsc-2015-0016.

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Abstract In the paper present’s an analysis of suitableness an application of compact and hybrid drive system in hoisting machine. In the paper presented the review of constructional solutions of hoisting machines drive system, driving with AC and DC motor. In the paper presented conception of modern, energy sparing hoisting machine supply system, composed with compact motor, an supplied with transistor or thyristor converter supply system, and intelligent control system composed with multilevel microprocessor controller. In the paper present’s also analysis of suitableness application an selected method of artificial intelligent in hoisting machine control system, automation system, and modern diagnostic system. In the paper one limited to analysis of: fuzzy logic method, genetic algorithms method, and modern neural net II and III generation. That method enables realization of complex control algorithms of hosting machine with insurance of energy sparing exploitation conditions, monitoring of exploitation parameters, and prediction diagnostic of hoisting machine technical state, minimization a number of failure states. In the paper present’s a conception of control and diagnostic system of the hoisting machine based on fuzzy logic neural set control. In the chapter presented also a selected control algorithms and results of computer simulations realized for particular mathematical models of hoisting machine. Results of theoretical investigation were partly verified in laboratory and industrial experiments.
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32

Luo, Fang L., and Roland J. Hill. "Influence of Feedback Filter on System Stability Area in Digitally Controlled Thyristor Converters." IEEE Transactions on Industry Applications IA-22, no. 1 (January 1986): 18–24. http://dx.doi.org/10.1109/tia.1986.4504676.

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33

Gała, Marek, Kazimierz Jagieła, Andrzej Jąderko, and Janusz Rak. "Integrated Multimotor Electrical DC Drive for Metallurgical Rolling Table." Acta Mechanica et Automatica 9, no. 2 (June 1, 2015): 93–98. http://dx.doi.org/10.1515/ama-2015-0016.

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Abstract A drive system of a section of a metallurgical rolling table consisting of six dc motors, 2220 amperes of total current, fed from a single ABB reversible thyristor converter has been described in this paper. Autonomous excitation circuits of the motors are fed from independent thyristor converters working in the so called MULTIFEX system linked with a supervisory high power converter. There are presented schemes of the DSL communication realized by FEX excitation cards of the motors using the SDSC card of the DCS-800-S02 converter and logic control system based on a PLC controller. The parameterization of the DCS-800 converter and the DCF 803 excitation systems was conducted using the DriveWindow software tool. Significant waveforms of voltages, currents and the estimated motor velocity are described and presented for the idle run as well as during transporting sheets discharged from a pusher furnace.
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34

Pilla, Azar, and Gorripotu. "Impact of Flexible AC Transmission System Devices on Automatic Generation Control with a Metaheuristic Based Fuzzy PID Controller." Energies 12, no. 21 (November 2, 2019): 4193. http://dx.doi.org/10.3390/en12214193.

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The present work proposes a teaching–learning-based optimization (TLBO)-tuned fuzzy proportional-integral-derivative (PID) controller of two-area hydro-thermal generating units for automatic generation control (AGC). The proposed system takes into account the physical constraints such as transport delay (TD), generation rate constraint (GRC), and governor dead band (GDB) nonlinearities. Firstly, fuzzy PID controllers were designed for both the areas and their gains were optimized using various minimization objective function criteria. Furthermore, applications of flexible alternating current transmission system (FACTS) devices such as static synchronous series compensator (SSSC), thyristor-controlled series capacitor (TCSC), thyristor-controlled phase shifter (TCPS), and unified power flow controller (UPFC) were investigated by integrating FACTS devices in appropriate locations of the system. The simulation results revealed that the minimum objective values were attained when the UPFC was placed in the system. Lastly, robustness analysis was done to observe the capability of the proposed controller with UPFC by changing system parameters and considering random load disturbances.
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35

Kosmodamianskiy, Andrey, Alexander Pugachev, and Nikolay Strekalov. "Control system of temperature of locomotives traction frequency converters." MATEC Web of Conferences 341 (2021): 00061. http://dx.doi.org/10.1051/matecconf/202134100061.

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The features of the control systems of temperature of the traction frequency converters consisted of rectifier, capacitor and voltage source inverter for traction rolling stock are discussed. The induction motor is considered as a load for traction frequency converter. The dependence of the number of thermal cycles from semiconductor junction temperature fluctuations before the failure of the semiconductor device are shown. The topology and operation principle of automatic temperature control system of voltage source inverter semiconductor devices of traction frequency converter are developed and described. The system is based on air forced cooling with the use of fan or blower as an executive regulation device. The main feature of the proposed system is the additional reference of switching frequency that allows to reduce the semiconductor temperature fluctuations. The elements of switching frequency control loop are chosen and evaluated, the recommendations on practical implementations are given. Simulation of automatic temperature control system in Matlab with both references of semiconductor junction temperature and its fluctuation was carried out with all essential nonlinearities of induction motors and semiconductor devices taken into account. Results of simulation are included and discussed.
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36

Blagoveshchenskaya, Margarita M., and Mikhail V. Veselov. "Comparative study of frequency converters of three-phase electric motors in automatic control of technological parameter." Health, Food & Biotechnology 2, no. 3 (September 15, 2021): 48–56. http://dx.doi.org/10.36107/hfb.2020.i3.s71.

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Frequency converters of asynchronous three-phase AC motors are widely used in industry, including food production. A thorough understanding of the technical capabilities of frequency converters contributes to their efficient use. This article discusses a technical comparison of two frequency converters of three-phase electric motors of the Russian company "OWEN" and the Danish company "DANFOSS" according to the criterion of the quality of regulation of the technological parameter. For comparison, a test bench was created, in which the devices were tested in turn, under the same conditions. During the preparation and implementation of testing, it turned out that the hardware capabilities of frequency converters for their use in regulating technological parameters are the same, and the parametric capabilities are different. The frequency converter of the "OWEN" company is equipped with a PI controller, and the frequency converter from "DANFOSS" is equipped with a PID controller. As the results of testing the devices show, despite
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37

Lv, Guo Yun, and Shui Xian Hu. "Research on Vacuum Consumable Arc Remelting Furnace Drop Testing System for Thyristor Power Supply." Applied Mechanics and Materials 268-270 (December 2012): 1494–98. http://dx.doi.org/10.4028/www.scientific.net/amm.268-270.1494.

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Stable and reliable automatic control system of Vacuum Consumable Arc Remelting (VAR) furnace with thyristor power supply is the key to smelt successfully special alloy metal and high temperature alloy metal, which is related to special properties of remelting ingot directly, however, it is key problem to test the drop pulse for thyristor supply. This paper makes a deep study for drop short pulse testing system on AVR with thyristor power supply, and digital signal processing is used to obtain drop short pulse value with different frequency ranges. According to the specification of thyristor power supply, firstly, basic theory analysis of drop short pulse measuring is researched. Secondly, high-speed digital signal processing technology is adopted to sample furnace voltage signal real-timely, trap filter group is designed to remove the multiple order harmonic, and band pass filter group is designed directly to process and calculate the amount of drop short pulses in different frequency ranges, finally, the material parameters which impact on drop short frequency. Field experiment results show the effectiveness of the whole drop short pulse testing system.
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38

Padhan, Saroj, Rabindra Kumar Sahu, and Sidhartha Panda. "Automatic generation control with thyristor controlled series compensator including superconducting magnetic energy storage units." Ain Shams Engineering Journal 5, no. 3 (September 2014): 759–74. http://dx.doi.org/10.1016/j.asej.2014.03.011.

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39

Hu, Yang, Heng Zhang, Jing Chen, Huan Zhang, Xinmeng Liu, Jiachen Li, Hanyu Chen, and Haiyang Hu. "A Multi-Functional De-Icing Equipment Using Hybrid Type Parallel Current Source Converters." E3S Web of Conferences 256 (2021): 02016. http://dx.doi.org/10.1051/e3sconf/202125602016.

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This paper has proposed a phase controlled and PWM controlled power current source converter (CSC) for transmission line de-icing. The proposed system consists of a high-power thyristor-based line commutated converter to contribute a majority of the dc de-icing current and a low power PWM CSC to provide a part of the dc de-icing current and to compensate the low order harmonic ac current from the TCR. Thus, the grid current can be highly sinusoidal. In order to avoid the resonance caused by the interaction between TCR and PWM CSC, a virtual impedance control is implemented in the PWM CSC without using any additional sensors. Comprehensive verification results have been obtained to validate the correctness of the proposed approach.
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40

Tamai, S., S. Murakami, R. Uchida, and H. Akagi. "Control and Performance of a Self-Commutated GTO Converter Operating in Parallel With Line-Commutated Thyristor Converters." IEEE Transactions on Industrial Electronics 51, no. 1 (February 2004): 67–73. http://dx.doi.org/10.1109/tie.2003.822086.

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41

Chiang, C. Y., and C. L. Chen. "Automatic gating control of lowest voltage switching for boundary mode buck converters." IET Power Electronics 3, no. 5 (2010): 649. http://dx.doi.org/10.1049/iet-pel.2009.0007.

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42

Abduraimov, Erkin, Dilshad Khalmanov, Moldagali Peysenov, and Nargiza Khamidova. "Control of quality and modes of power supply systems using contactless devices." E3S Web of Conferences 289 (2021): 07026. http://dx.doi.org/10.1051/e3sconf/202128907026.

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The article discusses the issues of creating contactless switching devices for automatic quality control and operation modes of power supply systems, using the developed contactless thyristor voltage relays, characterized by high reliability and speed, combining a sensitive system and a powerful final controlling element. Schemes with operating principles and experimental characteristics are given. It is proposed to use it to automatically turn on or off the booster transformer winding when the input voltage changes to maintain the rated voltage of electricity consumers, as well as to create a power regulator for capacitor banks of reactive energy compensating devices.
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43

Li, Xiao Guang, Ping Ping Xiao, and Juan Zhu. "An Energy-Saving Control System to Street Lamp Based on Sensor Networks." Applied Mechanics and Materials 397-400 (September 2013): 1430–33. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.1430.

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For the problems that the street running state and information was difficult to feedback and reasonable control, we apply the topology model to the street lighting management system, and complete the optimization control in this paper. Using the fuzzy control theory to handle the road signals, the intelligent lighting region controller integrates the thyristor chopper with the autotransformer technology, carries out the soft start and slow slope control to the street light, and realizes automatic voltage and energy saving. At finally, the system can realize the energy-saving control and intelligent, networked management of city street lamp.
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44

Zhu, Juan, Ji Ya Tian, Jun Hong Hao, and Shu Yan Zhang. "The Evaluation of Teaching Quality Based on Fuzzy Method." Advanced Materials Research 989-994 (July 2014): 2488–90. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.2488.

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For the problems that the street running state and information was difficult to feedback and reasonable control, we apply the topology model to the street lighting management system, and complete the optimization control in this paper. Using the fuzzy control theory to handle the road signals, the intelligent lighting region controller integrates the thyristor chopper with the autotransformer technology, carries out the soft start and slow slope control to the street light, and realizes automatic voltage and energy saving. At finally, the system can realize the energy-saving control and intelligent, networked management of city street lamp.
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45

Andriyanov, Aleksey. "Calculation optimal control system parameters for nonlinear dynamic processes of pulse voltage converters." Automation and modeling in design and management 2022, no. 4 (December 21, 2022): 87–96. http://dx.doi.org/10.30987/2658-6436-2022-4-87-96.

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A technique for choosing the optimal control system parameters for DC voltage converters is proposed, based on the joint application of the theory of linear automatic control systems and the theory of nonlinear dynamic systems. A small-signal structural dynamic model of an open loop of an automatic control system based on a direct step-up voltage converter with a control system for nonlinear dynamic processes based on a delayed feedback method is considered. Applying this model makes it possible to carry out a scientifically substantiated choice of the control system parameters for nonlinear dynamic processes using the methods of linear automatic control system theory. Bode diagrams of an open loop system are calculated without additional control of nonlinear dynamic processes and with additional control. The efficiency of using control systems for nonlinear dynamic processes is shown, which allows eliminating undesirable dynamic modes without additional parametric synthesis of the controller and, consequently, without reducing the system performance as a whole. In addition, applying these methods allows adjusting the controller parameters to increase the system performance without switching the system to undesirable dynamic modes. The results obtained can be applied at the stage of designing wide-class DC voltage pulse converters
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46

Maslihan. "PENGONTROL MOTOR KONVEYOR (BAN BERJALAN)." STRATEGY : JURNAL TEKNIK INDUSTRI 1, no. 1 (June 6, 2019): 19–23. http://dx.doi.org/10.37753/strategy.v1i1.404.

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Conveyors are the main mover in industrial processes, automation in conveyor operations is needed to increase company efficiency and productivity. In this thesis, a conveyor drive motor control system is designed based on the rotation parameters of the shredder motor as a reduced form of the actual size, as a model to understand the working principle and control of the conveyor drive motor using a motor scale in the laboratory. Fruit conveyor systems in industries are used to bring (herd) fruit into the aisle of the fruit crushing chamber. Control is carried out by varying the voltage at the input of the thyristor control circuit, which is carried out by changing the ignition angle (triggering) of the thyristor according to the assumption that the motor is driven in the Agrokusuma home industry as a comparison to the original scale with the laboratory scale. The motor functions as a driver by using a thyristor component as a speed regulator and using the LM3915 IC component to regulate the trip voltage level sensor. The test results show that the design of an automatic fruit shredder feeding control system can function according to predetermined specifications, which means that the speed of the shredder motor is linear with the conveyor motor so that there is a balance of fruit supply to the shredder motor by the conveyor motor. ABSTRAK Konveyor merupakan penggerak utama dalam proses industri, otomatisasi dalam pengoperasian konveyor sangatlah diperlukan untuk peningkatan efisiensi dan produktivitas perusahaan. Dalam skripsi ini dirancang sistem pengaturan motor penggerak konveyor berdasarkan perameter putaran motor shredder sebagai bentuk tereduksi dari ukuran sesungguhnya, sebagai model untuk memahami prinsip kerja dan pengendalian motor penggerak konveyor digunakan skala motor yang ada di laboratorium. Sistem konveyor buah di industri-industri digunakan untuk membawa (menggiring) buah untuk masuk ke dalam lorong ruang penghancur buah. Pengendalian dilakukan dengan memberikan variasi tegangan pada masukan rangkaian pengendali thyristor, yang dilakukan dengan mengubah-ubah sudut penyalaan (pemicuan) thyristor yang sesuai untuk pengasumsian penggerak motor yang berada di agrokusuma home industry sebagai pembanding skala asli dengan skala laboraturium. Motor berfungsi sebagai penggerak dengan menggunakan komponen thyristor sebagai pengatur kecepatan dan menggunakan komponen IC LM3915 untuk pengatur sensor level trip tegangan . Hasil pengujian menunjukkan bahwa rancangan sistem pengendalian otomatis fruit shredder feeding dapat berfungsi sesuai dengan spesifikasi yang telah ditetapkan yang artinya kecepatan motor shredder bersifat linier dengan motor konveyor sehingga terjadi keseimbangan suplai buah pada motor shredder oleh motor konveyor
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47

Yousfi, Boutheina, Abdelmouméne Delassi, and Salem Arif. "Improvement of Automatic Generation Control Behavior of Two Interconnected Areas Using SMES and TCSC." Advances in Modelling and Analysis B 64, no. 1-4 (December 31, 2021): 40–45. http://dx.doi.org/10.18280/ama_b.641-406.

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In this paper, an attempt has been made to enhance the dynamic behaviour of Automatic Generation Control (AGC) of two areas two units using both Thyristor Controlled Series Compensator (TCSC) placed in the tie-line and Superconducting Magnetic Energy Storage (SMES) units are considered in both areas. For more realistic study, the effects of Governor Dead Band (GDB) and Generation Rate Constraints (GRCs) are taken into account for both areas. However, to conduct the system to better dynamic responses, we have implemented a PI-PD cascade controller. After that, a well-known and powerful optimisation algorithm named Firefly Algorithm (FA) is employed by evaluating the Integral of the Squared Error (ISE). From the obtained results, the implemented methods prove its efficiency from different view of points such as: minimisation of Overshoot and Undershoot Peaks (PO), (PU) and Settling Time (ST).
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48

Damin, Zhang, Wang Shitao, Kang Shaobo, and Zhang Ji. "Implementation of the Predictive Current Control of Multi-Pulse Flexible Topology Thyristor Rectifier Under Unbalanced Source Voltages." Open Electrical & Electronic Engineering Journal 11, no. 1 (January 25, 2017): 14–22. http://dx.doi.org/10.2174/1874129001711010014.

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Predictive current control strategy has captured much concern recently in power converters. As for the multi-pulse flexible-topology thyristor rectifiers (m-PFTTR), the symmetry of the input line-to-line voltages has great influence upon the implementation of the control strategy. Existing literatures have mainly focused on the implementation under ideal condition, i.e., the input line-to-line voltages, being critical to the predictive current controller, were supposed to be symmetrical. In fact, the unbalance of the input line-to-line voltages usually exists in the windings of the zigzag transformer at front end and the A/D converter of the digital signal processor (DSP). This paper presents a new method to dynamically regulate the input line-to-line voltages to ensure the symmetry of each other. It is realized through the instantaneous correction of the bias values in the course of sampling, and the correction is embodied in the modified control algorithm. The paper includes analyses of the m-PFTTR as well as the control algorithm, simulation and experiments. Simulation and experimental results demonstrate the effectiveness of the presented method.
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49

Zhou, Bing, and Jing Hui Zhao. "Design of Temperature Control System for Thermocouple Verification Based on Virtual Instrument Technology." Advanced Materials Research 706-708 (June 2013): 742–47. http://dx.doi.org/10.4028/www.scientific.net/amr.706-708.742.

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The thermocouple calibration temperature control system is constructed USB - 4716 200 ks/s, 16 multi-function USB module, JKH-C series thyristor phase shift trigger, PC machine as the main hardware, the U.S. National Instrument (NI) company Labview as the software development platform. According to the precious metal, base metal thermocouple wire thermoelectric EFM method to determine the temperature test point, the temperature control system using automatic control to test furnace temperature, and realize the visual operation interface. Temperature control accuracy: temperature deviation calibration point is less than ± 5 °C when testing the thermocouple, constant temperature stability: constant temperature's change is less than 0.2 °C /min in the thermocouple testing process.
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50

Afanasov, A. M., S. V. Arpul, V. Y. Vasyliev, O. O. Hololobova, and S. M. Holik. "Automated Control Systems for Mutual Loads of Traction Electric Machines." Science and Transport Progress, no. 1(97) (October 17, 2022): 50–58. http://dx.doi.org/10.15802/stp2022/265336.

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Purpose. Testing of electric machines should be as objective as possible and contain reliable information about the quality of manufacture or repair of electric machines. During the tests, the parameters of the total power of the test bench sources, energy efficiency of each test process, the difference in thermal loads of the armature windings and excitation windings change. To perform the full test of the electric machine, it is necessary to equip test benches with systems for automatic control of the process of mutual loading. The analysis of different variants of automatic control systems is performed in the work. Methodology. Theoretical studies of electromagnetic processes using a mathematical model of the system “voltage source – traction motor” were performed. This system allows determining the energy performance of electric machines in the entire range of changes in loads and voltages during the tests. The methods of theoretical research and analytical calculation of electrical circuits, theoretical foundations of electrical engineering, mathematical modelling of electrical and energy processes were used in the analysis. Findings. The analysis of rational variants of functional schemes’ construction of automatic control systems with various quantity of power supplies, automatic control loops, mechanical and electric power converters is performed. Rational functional schemes of automatic control systems for testing various collector electric machines of direct and pulsating current are developed. Originality. Rational variants of construction of test benches with electric and mechanical moment converters taking into account variable processes of loading of electric cars during the test are offered. The analysis of energy efficiency of various variants of construction of test benches for testing electric machines in entire range of change of test loadings and voltage of power supplies in the case of using the automatic control system of mutual loading process is performed. Practical value. The conducted research will allow creating recommendations for the design of automated control systems for test benches in order to improve the technical and economic characteristics, reduce the consumption of electricity consumed for testing.
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