Journal articles: 'Thyrister control'

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Fernandez, Ian Christian, Maria Theresa De Leon, Anastacia Alvarez, John Richard Hizon, and Marc Rosales. "Properties and Design of CMOS Thyristor Delay Elements." Journal of Integrated Circuits and Systems 17, no. 1 (April 30, 2022): 1–7. http://dx.doi.org/10.29292/jics.v17i1.580.

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The CMOS thyristor delay element and its basic operation are presented in this paper. Six variations of the thyristor design developed over the years to extend the delay length, to improve the consistency of the delay, or to control the sensitivities of the delay are also discussed. This includes the complementary thyristor, the thyristor without the current source, the thyristor with threshold elevation, the thyristor with opposing current source, the single-ended thyristor, and the thyristor-type feedback delay element. Design considerations common to all CMOS thyristors are also discussed to provide insights on topology selection, capacitive loading, and transistor sizing.

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Chyzhenko, O. I., and O. B. Rybina. "STUDY OF TRANSIENT PROCESSES IN THE CIRCUIT OF A CONDITIONALLY-TWELVEPHASE THYRISTOR COMPENSATOR FOR THE CORRECTION OF TRANSIENT START-UP MODES IN THE ELECTRICAL NETWORK." Praci Institutu elektrodinamiki Nacionalanoi akademii nauk Ukraini 2022, no. 63 (November 21, 2022): 58–64. http://dx.doi.org/10.15407/publishing2022.63.058.

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Electromagnetic transient processes in a network with a conventionally twelve-phase thyristor compensator designed to adjust the value of the starting transient current of the network in the case of direct start from the network of asynchronous motors of comparable power to the network with a jump-like change in the control angle of the thyristors in the bridges were studied. A comparison was made with such a change in the control angle of thyristors of transient currents in the circuits of a two-bridge controlled thyristor compensator with parallel connection of bridges with transient currents in a conventionally twelve-phase thyristor compensator, where these bridges are switched on in series with each other relative to the supply voltage. The advantages of the technical and economic and mass-dimensional parameters of the conventional twelve-phase converter and its operational characteristics when applied in practice in comparison with analogues are indicated. Ref. 5, fig. 6, table.

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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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Pirozhenko, Andrii, Yevhenii Modlo, Ruslan Shaida, Viktor Batarieiev, Mykola Zhukov, and Mykhailo Drukker. "Principle of Organization for Laboratory Stand of the Electric Drive with a Real Regulatory System No Time Scaling." SHS Web of Conferences 100 (2021): 06002. http://dx.doi.org/10.1051/shsconf/202110006002.

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The existing practical training of specialists in the field of the electric drive is recognized as insufficient, not allowing them to conduct independently a complex of adjustment works or works on elimination of refusals. All known virtual methods of research of electric drives are scaled in time therefore at the trained skills on use of the measuring and registering devices during the work on real installation don't develop, and also skills on work with real knots of control systems for control of the set drive modes. We propose a stand consisting of a real system of regulation and the model of the power drive to work without time scale, thus significantly closer to the actual laboratory setting drive. The structure of the laboratory stand on the basis of the engine of a direct current of independent excitement with the reversible thyristor converter is in details considered. It is proved that an optimal algorithm for the simulation of three-phase bridge converter operating at anchor chain is an algorithm which rooms include a thyristor and of the remaining thyristors allows you to choose the design scheme and carry out the integration of equations describing electric processes in the circuit detect a change in state of the thyristors and the transition to other design scheme. Given the discrete model and considered design scheme of three-phase bridge Converter in a normal mode switching thyristors and emergency mode, if false turn on of the thyristor during commutation. Mathematical model of the device - the solution of differential equations by numerical integration of the Runge-Kutta. Proposed hardware mathematical model based on the family of microcomputer ARM СortexTM fourth generation.

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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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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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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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Соболева, О. С., В. С. Головин, В. С. Юферев, П. С. Гаврина, Н. А. Пихтин, С. О. Слипченко, and А. А. Подоскин. "Моделирование пространственной динамики включения лазера-тиристора (λ=905 нм) на основе многопереходной гетероструктуры AlGaAs/InGaAs/GaAs." Физика и техника полупроводников 54, no. 5 (2020): 478. http://dx.doi.org/10.21883/ftp.2020.05.49265.9341.

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Abstract A 2D carrier transport model to be used in studying the spatial current dynamics in laser thyristors is presented. The model takes into account such features as optical feedback, impact ionization, and drift velocity saturation in strong electric fields. It is shown that there is current localization during laser-thyristor switch-on. A relationship is demonstrated between the distribution nonuniformity of the control current and its amplitude and position of the initial switch-on region. The time of laser-thyristor switch-on is 13 ns at a feed voltage of 26V, with a time of switch-on spreading over the entire 200-μm stripe width of ~65 ns. These parameters remain invariable irrespective of the switch-on spatial dynamics.

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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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Bimali, Bibek, Sushil Uprety, and Ram Prasad Pandey. "VAR Compensation on Load Side using Thyristor Switched Capacitor and Thyristor Controlled Reactor." Journal of the Institute of Engineering 16, no. 1 (April 12, 2021): 111–19. http://dx.doi.org/10.3126/jie.v16i1.36568.

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Generally, AC loads are the inductive loads which are reactive in nature. These loads, thus, demand and draw reactive power from the supply source. If these loads draw large lagging current from the source, this will cause excessive voltage drop in the line, which can even cause the voltage collapsing in the line itself if the drop in the line is excessively high. VAR compensation means efficient management of reactive power locally to improve the performance of AC power systems. In this paper, Static VAR Compensator, using TSC (Thyristor Switched Capacitor) and TCR (Thyristor Controlled Reactor), is designed and simulated in MATLAB to maintain the power factor of power system nearly to unity at all times. TSC and TCR are basically shunt connected capacitors and inductor respectively whose switching (of capacitors) and firing angle control (of inductor) operations are carried out using thyristors. The purpose of capacitors is to supply lagging VAR as per the demand by the connected loads and the overcompensation due to excess VAR generated by the discrete set of turned on capacitors are absorbed by the adjustable inductive reactance of the inductor in TCR branch through firing angle control mechanism.

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Gałuszkiewicz, Patryk, Zbigniew Gałuszkiewicz, and Janusz Baran. "Simulation Studies of Energy Recovery in a BLDC Motor-Based Kinetic Energy Storage." Energies 15, no. 20 (October 12, 2022): 7494. http://dx.doi.org/10.3390/en15207494.

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This paper presents research conducted on the development of an innovative system to increase the amount of energy recovered from a high-speed kinetic energy storage based on a three-phase permanent magnet brushless (PM BLDC) motor/generator (mogen) with a flywheel-shaped rotor, compared to the efficiency obtained for standard solutions with power electronics systems. This kinetic energy storage is currently under development. In the system presented in the paper, the regulated DC output voltage of the 6T thyristor bridge is controlled with a tolerance within ±10% of the reference voltage for a variable power load. The input voltage of the rectifier is a three-phase trapezoidal-shaped voltage from the rotating mogen, whose amplitude can vary from 0 to 650 V and frequency from 0 to 250 Hz voltage. The article presents example results of simulation tests of the mogen-based kinetic energy storage model with the thyristors’ firing angle control system. As part of the research, a prototype of the rectifier was built on a laboratory scale, to confirm the validity of the assumptions regarding the synchronization and control method of the bridge using a new design of the thyristor gate drivers.

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Yu, Xin, Tao Niu, Li Peng Han, Jian Hao Liu, Jian Wang, Xiao Lin Deng, and Shu Han Wang. "C++ Builder and Inter Base Based Design and Realization of Intelligent Monitoring Control System of HV Static Reactive Compensator." Advanced Materials Research 1049-1050 (October 2014): 712–15. http://dx.doi.org/10.4028/www.scientific.net/amr.1049-1050.712.

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SVC is a dynamic reactive compensator based on switching type HV electrical and electronic devices, well recognized as an effective means of resolving power quality problems. SVC is complex in structure, consisting of TCR valve sets, FC filter channel, etc. In particular, TCR valve set adopts thyristor serial connecting technology, and over 100 thyristors are adopted, which requires real-time status of devices in SVC to be monitored and uploaded, and even failures to be recorded. Therefore, the monitoring software becomes an important part in ensuring SVC safe operation. Combined with actual cases, this paper introduces a technology of using C++ Builder and Inter Base to design the static reactive compensator monitoring software. The user interface is elegant, with short development period, highly transplantable, and easily modified.

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Abduraimov, Erkin, and Dilshad Khalmanov. "Development of contactless solid state voltage relay." E3S Web of Conferences 216 (2020): 01106. http://dx.doi.org/10.1051/e3sconf/202021601106.

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The article deals with the research issues of compact, reliable, high-speed semiconductor solid-state non-contact voltage relays with an increased service life, combining a sensitive system and a powerful actuator with a sinusoidal voltage curve at the load. Theoretical studies of a controlled resistive and non-autonomous dynamic circuit, consisting of a thyristor connected in series with a parallel circuit containing a capacitance and an active resistance, under the influence of an external sinusoidal voltage, which can be used in control circuits of power thyristors, are presented. An experimental characteristic is shown with a description of the operating principle of the developed solid-state non-contact voltage relay.

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Wan, Jiexing, Wei Hua, and Baoan Wang. "Compulsory Islanding Transition Strategy Based on Fuzzy Logic Control for a Renewable Microgrid System." Mathematical Problems in Engineering 2021 (May 17, 2021): 1–13. http://dx.doi.org/10.1155/2021/9959222.

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Advantages of microgrid integrated with a renewable energy system have been acknowledged in more and more applications. Operating steadily during different modes is of great significance, and different modes transferring must be transient, seamless, and reliable to maintain the continuous electricity supply for loads, especially sensitive ones. As a semicontrolled switch that is unable to shut instantly until the zero point of its current, thyristors should be forced to be turned off by certain strategies to minimise the influence brought by the delay of modes transferring. In this paper, a compulsory turn-off strategy based on fuzzy logic control of converter output voltage is proposed. With the strategy, an alterable reverse voltage is applied across the conducting thyristor by dynamically adjusting the output voltage reference instruction and closed-loop control parameters depending on the changing rate rather than detecting the polarity of voltage or current. Constraints from acquisition of analog data and error of digital calculation will be eliminated. Finally, simulation and experimental results verify the effectiveness of the proposed strategy.

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Brito, Marcelo R. S., Fernando C. Melo, Luiz C. Freitas, João B. Vieira, Ernane A. A. Coelho, Valdeir J. Farias, and Luiz C. G. Freitas. "Didactic platform for teaching of three-phase rectifier circuits in power electronics." International Journal of Electrical Engineering & Education 51, no. 4 (October 2014): 279–91. http://dx.doi.org/10.7227/ijeee.0001.

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With the aim of preventing an Electrical Engineering course from being predominantly theoretical, the didactic materials used in laboratory activities are essential to make the learning process easier and more stimulating for the student. In this context, this paper presents a didactic platform developed for teaching a.c.-d.c. converters in the subject of power electronics at the Federal University of Uberlândia (UFU), Brazil. The proposed platform consists of a three-phase controlled and/or uncontrolled rectifier. The IC TCA785 is used to control thyristor operation. In order to make teaching more dynamical, the didactic platform was designed to have various operating conditions, simulating, for example, breakdown components and mixed use of thyristors and diodes. A prototype of the proposed platform was built, evaluated experimentally in the laboratory and the results are shown in this paper.

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Soskov, A., Ya Forkun, O. Iegorov, and M. Glebova. "Principles and methods of non-contact DC contactors calculation for alternative power systems." Lighting engineering and power engineering 1, no. 57 (April 6, 2020): 9–15. http://dx.doi.org/10.33042/2079-424x-2020-1-57-9-15.

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It is shown that the principle of control and power supply of a non-contact bi-directional DC contactor by the electrical line voltage is implemented by connecting the electronic control circuit by one output between two opposite powered gate-controlled thyristors of the bilateral switch to the first pole of the contactor and the second one – to the output clamp. As a result, the electrical line voltage is fed to the electronic circuit only for a short time (up to ms), that is determined by the charge time of the switching capacitor to the breakdown voltage of the threshold zener diode. The peculiarities of the heating process of the power semiconductor contactor in different operating conditions were determined, that allowed to develop a methodology that with sufficient accuracy determines such important parameters as rated and operational current of the contactor. In addition, it was found that in order to reduce significantly the capacity of the switching capacitor, and consequently the size and cost, it is necessary while turning on of the switching thyristor the discharging current of the switching capacitor was equal to the current of its charging circuit, and their values should not be less than the maximum allowable current of turning off the gate-controlled thyristor. It is allows to define justified the parameters of the elements that provide a secure turning off the bilateral switch. The researches have also shown that the non-contact contactors due to the introduction of the network voltage control as compared with existing ones have peculiarities which rise competitive abilities. In particular, they are more reliable, they do not need to supply an additional power source, they exclude standard drivers, and minimize energy consumption. Thus, an exemplary aspect of using the obtained scientific result is the ability to create competitive reliable non-contact DC contactors for voltage up to 1000 V and currents of 100-600 A for alternative energy. Key words – non-contact bi-directional DC contactor, switching capacitor, switching thyristor, power semiconductor switch, alternative energy.

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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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Albrecht, Matthaeus, Andreas Huerner, Tobias Erlbacher, Anton J. Bauer, and Lothar Frey. "Experimental Verification of a Self-Triggered Solid-State Circuit Breaker Based on a SiC BIFET." Materials Science Forum 897 (May 2017): 665–68. http://dx.doi.org/10.4028/www.scientific.net/msf.897.665.

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In this work, the feasibility of the Bipolar-Injection Field Effect-Transistor (BIFET) [5] in two different Dual Thyristor type circuits [4] for an application as solid-state circuit breaker (SSCB) is experimentally verified. The Dual Thyristor type circuits are assembled from discrete silicon JFETs and a silicon carbide BIFET and are electrically characterized at various temperatures. The current-voltage characteristic shows the expected regenerative self-triggered turn-off capability under over-currents and the option to control the turn-off current by a passive resistor network. The issue with the adverse positive temperature coefficient of the trigger-current can be solved by putting the SiC BIFET in a cascode arrangement with a silicon Dual Thyristor. In this configuration the SiC BIFET provides the high voltage blocking capability and the silicon Dual Thyristor with its negative temperature coefficient controls the trigger-current. Transient analyses of both circuits indicate fast switching times of less than 50 μs seconds. It is demonstrated for the first time, that the SiC BIFET, due to its normally-on behaviour, used in a Dual Thyristor type circuit is a promising concept for self-triggered fuses in high current and high voltage applications.

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Vobecky, Jan. "The Bidirectional Phase Control Thyristor." IEEE Transactions on Electron Devices 67, no. 7 (July 2020): 2844–49. http://dx.doi.org/10.1109/ted.2020.2991690.

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Samatov, Nematjon Akhmatovich. "Selection Of Flow Diagrams Of The Adjustable Thyristor Asynchronous Electric Actuator With Phase Control." American Journal of Engineering And Techonology 02, no. 11 (November 20, 2020): 19–24. http://dx.doi.org/10.37547/tajet/volume02issue11-03.

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This article discusses the use of thyristors and the choice of a circuit in the control of adjustable asynchronous electric motors. The theoretical foundations and practical aspects of using various control schemes for asynchronous electric drives are presented.

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Sh. Wais, Dunya, and Wafaa S. Majeed. "PERFORMANCE OF HIGH VOLTAGE TRANSMISSION LINE BASED ON THYRISTOR-CONTROL SERIES COMPENSATOR." Journal of Engineering and Sustainable Development 25, no. 5 (May 1, 2021): 26–38. http://dx.doi.org/10.31272/jeasd.25.5.3.

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This research aims to improve the steady-state performance of high-voltage power transmission lines, which is a significant challenge for the power system grid's safe and reliable operation. The research adopted Flexible Alternating Current Transmission System for electronic devices. The flexible alternating current transmission system technology will be used in this specific work as Thyristor-Controlled Series Compensators. Thyristor-controlled series compensator devices increase transmission systems' capacity and enhance the voltage profile by regulating transmission line reactance. Gravitational Search Algorithm is a meta-heuristic approach applied to find the optimum size and optimal location of thyristor-controlled series compensators in power systems. The gravitational search algorithm is used to solve the multi-objective and integrated optimum power flow problem in reactive energy management during normal and contingency operations. The results showed reduced voltage deviation, reduced active/reactive power losses, and increased transmission line reserves above thermal limits, in addition to reducing the installed cost and number of thyristor series compensators devices. The simulation part was created with MATLAB programming language and validated with MATPOWER software. Applied to IEEE 30 bus system and 400kV super high voltage grid system.

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Sh. Aziz, Mothanna, and Ahmed G. Abdullah. "Hybrid control strategies of SVC for reactive power compensation." Indonesian Journal of Electrical Engineering and Computer Science 19, no. 2 (August 1, 2020): 563. http://dx.doi.org/10.11591/ijeecs.v19.i2.pp563-571.

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<span>This article shows a prospective utilizations of flexible AC transmission system (FACTS) controls, like the static VAR compensator (SVC). One of the major motives for setting up an SVC is to recover dynamic voltage controller and thus increase system load aptitude. Static VAR compensator system proposed in this work consists of thyristor switched capacitor and thyristor controlled reactor sets, this style of SVC modelled using MATLAB simulink toolbox. A hybrid genetic algorithm with PI and fuzzy logic controls that used to control and expand the grid performance of the power system. The model results reveal that the Static Var Compensation contribute a decent result in upholding bus voltage after the power network is in an active and steady moment, besides it has a capability of the constancy control. It can totally work as a significant plan of reactive power recompense in power networks. </span>

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Dzhaborov, Mehrubon, Sergey Myatezh, and Vladlen Ivanov. "Research of Four-Zone Converter in Regenerative Braking Mode." Applied Mechanics and Materials 698 (December 2014): 101–5. http://dx.doi.org/10.4028/www.scientific.net/amm.698.101.

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Algorithm of thyristor control for the single-phase four-zone converter with the ladder structure, functioning in regenerative mode was compiled; investigation of the proposed converter was conducted. The correctness of thyristor control algorithms was checked by means of a computer model in the medium MATLAB / Simulink.

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Юрков, С. Н., Т. Т. Мнацаканов, and А. Г. Тандоев. "Неодномерный эффект dU/dt в мощных тиристорах." Физика и техника полупроводников 54, no. 1 (2020): 69. http://dx.doi.org/10.21883/ftp.2020.01.48777.9137.

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The method allowing to take into account the influence of the design peculiarities of a power thyristor on its dU/dt parameter is described. A simple model is proposed, that makes it possible to find the parameters of the auxiliary thyristor structure that belongs to the regenera-tive control gate and provides the given value of the thyristor dU/dt parameter. The minimum possible value of turn-on current of the thyristor, limited by a given value of the maximum rate of voltage rise, is found.

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Asabin, A. A., I. V. Belyanin, E. N. Sosnina, R. Sh Bedretdinov, and E. V. Kryukov. "CONTROL SYSTEM OF THYRISTOR VOLTAGE REGULATOR." Интеллектуальная электротехника, no. 1 (2020): 25–39. http://dx.doi.org/10.46960/2658-6754_2020_1_25.

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Asabin, A. A., A. A. Kralin, and E. V. Kryukov. "Thyristor voltage regulator control algorithm research." IOP Conference Series: Materials Science and Engineering 643 (November 13, 2019): 012046. http://dx.doi.org/10.1088/1757-899x/643/1/012046.

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Mochalov, I. A. "Adaptive Identification and Thyristor Converter Control." IFAC Proceedings Volumes 22, no. 16 (October 1989): 311–14. http://dx.doi.org/10.1016/s1474-6670(17)53030-x.

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Nedeljkovi, M., and Z. Stojiljkovi. "Fast current control for thyristor rectifiers." IEE Proceedings - Electric Power Applications 150, no. 6 (2003): 636. http://dx.doi.org/10.1049/ip-epa:20030910.

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Timoshkin, Vadim V., and Semen S. Popov. "Study of electric drive with thyristor voltage regulator." Yugra State University Bulletin 18, no. 3 (October 8, 2022): 99–106. http://dx.doi.org/10.18822/byusu20220399-106.

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In the modern world, the electric drive has tasks of different nature, depending on the application and technological process. At the moment, induction electric drives, which operate by direct start, are widely used. This method has negative factors: high starting currents at the launch; impact loads on the mechanical system. During continuous running mode of the electric motor with direct start, its resource and mechanical system is reduced. Thyristor voltage regulators is used extensively to solve this problem. Ramp generators are used for soft start, the parameters of which determine the settling time and how efficiently the peak currents and torques will be reduced. Object of research: induction electric drive with thyristor voltage regulator. Purpose of research: research of parameters of ramp generator for electric drive with thyristor voltage regulator. Methods of research: numerical methods for solving differential equations, functional diagrams, control system topology, electric drive theory. Main results of research: A generalized algorithm for the control system of thyristor voltage regulator keys is presented. An analysis was made for parameters of ramp generator in the electric drive with thyristor voltage regulator.

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Lei, Youjian, and Xiaomin Lin. "LED Driving Power Online Detection System." Modern Electronic Technology 1, no. 1 (October 16, 2017): 1. http://dx.doi.org/10.26549/met.v1i1.320.

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LED driving power is a necessary product for LED lighting; the behaviors of pursuing low-cost of some small and medium-sized enterprise producers in China directly affect the quality of LED power. Therefore, it is necessary to detect the reliability of the LED driving power. There are 4 main factors for the over-burning of the LED driving power: lightning oscillation frequency, voltage mutation frequency, switch motion frequency and static discharge frequency.For the above problems, this paper raises the LED driving power online detection system, including: surge voltage input module, main control module, pulse width modulation module, power module, thyristor control module, current transformer, amplifier, RMS-DC conversion module, A/D conversion module, display module, main control module connecting to surge voltage input module.The main operating principle is that the main control module connects the pulse width modulation module, which connects the thyristor control pole of the thyristor control module, the first anode thereof connects the power module; the primary side of current transformer connects the second anode of the thyristor control module through two wire switches, and the secondary side thereof connects the amplifier, which connects the RMS-DC conversion module; RMS-DC conversion module connects the A/D conversion module, which connects the main control module; the main control module also connects the display module. In addition, the project also provides the detection functions of LED output current, voltage digital display and different loads.

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31

Abduraimov, Erkin. "Research of the trigger effect in diode-thyristor circuits of contactless relay devices." E3S Web of Conferences 216 (2020): 01105. http://dx.doi.org/10.1051/e3sconf/202021601105.

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The paper investigates the main properties of the trigger effect in diode-thyristor circuits and proposes the creation of small-sized thyristor contactless voltage relays, combining in one device a sensitive system to changes in input voltage and powerful actuators capable of switching large load currents. The article also discusses a non-contact thyristor relay of alternating current voltage, the load mode of which is analyzed, taking into account the voltage of the transition to the open state of the thyristor and the formula for the effective value of the voltage across the load. It is proposed to use the developed such relays as contactless switching and control equipment, which allow to reliably and quickly control the operating modes of electrical equipment, regulate the reactive power of capacitor banks, create ring networks, improve the quality of electricity in distribution networks and reduce capital costs for the construction of a power supply system.

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Fazliddin, Arzikulov, Sadullayev Tuymurod, and Olimov Orif Nosirovich. "Use Of Recovery Boilers At Gas-Turbine Installations Of Compressor Stations And Thyristor Controls." American Journal of Applied Sciences 02, no. 09 (September 21, 2020): 46–50. http://dx.doi.org/10.37547/tajas/volume02issue09-08.

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Matafonova, E. P., and S. B. Burkhanov. "Application Features of Thyristor Regulators to Control the Light Flux in Industrial Fishing." E3S Web of Conferences 320 (2021): 01015. http://dx.doi.org/10.1051/e3sconf/202132001015.

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To control the intensity of the light flux when fishing saury it is necessary to widely change the voltage of the lighting fishing equipment. It is reasonable to carry out this by controlling additionally installed thyristor regulators supplying individual symmetric three-phase groups of light sources that will ensure balanced loading of the synchronous generator stator windings. In this research the features of using a thyristor voltage regulator in a four-wire system of ship power supply are studied based on mathematical analysis, conclusions are made using computer modeling and the use of current limiting reactors is justified.

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Bajwa, Muhammad Shahzad, Muhammad Usman Keerio, Noor Hussain Mugheri, Rameez Akbar Talani, Rizwan Aziz Siddiqui, and Riaz Hussain Memon. "Simulink Analysis and Mathematical Modeling of Parameters Variation for Thyristor based Speed Controller of Single Phase Induction Motor." Vol 3 Issue 5 3, no. 5 (December 31, 2021): 45–58. http://dx.doi.org/10.33411/ijist/2021030504.

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The thyristor is a power electronics device that is widely used in various electrical appliances due to its lower on-conduction losses, easy availability, lower switching loss, greater efficiency and cost-benefit. Mostly a thyristor is used in rectifiers and variable-speed drives. Almost 70% of loads used in the world consists of induction motors in various types and forms. In this work, a thyristor-based controller is used to control the speed of a single phase induction motor by adjusting the firing angle for the gate terminal of the thyristor. Depending upon the firing angle, the output voltage, output current, speed, power factor and the total harmonic distortion are varied which is analyzed through MATLAB/Simulink. Further curve fitting technique is used to formulate the mathematical relationships between varying parameters concerning thyristor’s firing angle. The findings of this work are helpful to achieve the best curve fit model for varying parameters concerningthe thyristor firing angle.

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Lock, K. S. "Thyristor Control of Shaded-Pole Induction Motors." Electric Machines & Power Systems 13, no. 3 (January 1987): 185–93. http://dx.doi.org/10.1080/07313568708909234.

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36

Farahat, H. M., M. S. Ismail, and M. A. Ashour. "Stability analysis of thyristor device control systems." Transactions of the Institute of Measurement and Control 8, no. 1 (January 1986): 2–8. http://dx.doi.org/10.1177/014233128600800101.

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Sugawara, F., M. Kimura, and Y. Sunohara. "Minority-carrier control gate turn-off thyristor." IEEE Transactions on Electron Devices 36, no. 1 (January 1989): 132–37. http://dx.doi.org/10.1109/16.21192.

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Trọng Dũng, Nguyễn, Nguyễn Chính Cương, Hồ Tuấn Hùng, and Lại Khắc Hoàng. "Simulation of thyristor application in AC motor control." Journal of Science, Natural Science 60, no. 4 (2015): 9–16. http://dx.doi.org/10.18173/2354-1059.2015-0002.

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Nasir, Bilal Abdullah. "Performance Improvement of Induction Motor Controlled by Thyristor Chopper on the Rotor Side." International Journal of Electrical and Electronics Research 10, no. 4 (December 30, 2022): 1154–58. http://dx.doi.org/10.37391/ijeer.100463.

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In this paper, the performance characteristics of a variable-speed drive system with a wound rotor induction motor incorporating a 3-phase diode bridge rectifier - thyristor chopper with a modified commutation circuit system on the rotor side were studied. A DC equivalent circuit was used in the analysis of the motor-rectifier-chopper system and suitable equations have been derived for the determination of the system performance. The analytical results obtained are compared with those obtained experimentally to ascertain the validity of the system in practical applications. The results obtained indicate that a true variable speed drive system based on a thyristor chopper-controlled induction motor is successfully implemented. It is shown that the thyristor chopper control using the Hitachi commutation circuit permits the realization of a slip-ring induction motor as a variable speed and improved power factor. Also, the torque level obtained by the chopper control was found to be three times that obtained from conventional rotor resistance control at the same conditions.

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40

Prokudin, Aleksandr, and Anton Korzhov. "EXPANDING THE FUNCTIONAL CAPABILITIES OF A THYRISTOR FIELD DAMNING DEVICE FOR INTENSIFICATION OF PROCESS CONTROL." Bulletin of the South Ural State University series "Power Engineering" 22, no. 1 (March 2022): 48–54. http://dx.doi.org/10.14529/power220105.

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Abstract. The article considers the operation of a commonly known thyristor device for dampening a synchronous generator magnetic field. Improvement in the characteristics of the device and expansion of its functionality with a known control algorithm requires an increase in the number of quenching circuits. The article proposes an algorithm for controlling damping circuits based on the principle of binary coding of the decimal value of the required equivalent re-sistance of the device. The current-voltage characteristics of the device have been determined for two variants of circuits of thyristor field damping devices. An increase in the average value of the voltage at the terminals of the excitation winding and an increase in the quality of synthesizing the required current-voltage characteristic were noted. The article further de-scribes the advantages and disadvantages of the described algorithms and schemes. It has been proven that the transition to a new control algorithm for damping circuits improves the characteristics of the thyristor device for dampening the synchronous generator magnetic field without the need for changes in the power section. However, this requires measures to be taken, in order to improve the reliability of the control system.

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Vukosavic, Slobodan, Nikola Popov, and Zeljko Despotovic. "Power electronics solution to dust emissions from thermal power plants." Serbian Journal of Electrical Engineering 7, no. 2 (2010): 231–52. http://dx.doi.org/10.2298/sjee1002231v.

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Thermal power stations emit significant amounts of fly ash and ultra fine particles into the atmosphere. Electrostatic precipitators (ESP) or electro filters remove flying ashes and fine particles from the flue gas before passing the gas into the chimney. Maximum allowable value of dust is 50 mg/m3 and it requires that the efficiency of the ESPs better than 99 %, which calls for an increase of active surface of the electrodes, hence increasing the filter volume and the weight of steel used for the filter. In previous decades, electrostatic precipitators in thermal power plants were fed by thyristor controlled, single phase fed devices having a high degree of reliability, but with a relatively low collection efficiency, hence requiring large effective surface of the collection plates and a large weight of steel construction in order to achieve the prescribed emission limits. Collection efficiency and energy efficiency of the electrostatic precipitator can be increased by applying high frequency high voltage power supply (HF HV). Electrical engineering faculty of the University of Belgrade (ETF) has developed technology and HF HV equipment for the ESP power supply. This solution was subjected to extensive experimental investigation at TE Morava from 2008 to 2010. High frequency power supply is proven to reduce emission two times in controlled conditions while increasing energy efficiency of the precipitator, compared to the conventional thyristor controlled 50Hz supply. Two high frequency high voltage unit AR70/1000 with parameters 70 kV and 1000 mA are installed at TE Morava and thoroughly testes. It was found that the HF HV power supply of the ESP at TE Morava increases collection efficiency so that emission of fine particles and flying ashes are halved, brought down to only 50 % of the emissions encountered with conventional 50 Hz thyristor driven power supplies. On the basis of this study, conclusion is drawn that the equipment comprising HF HV supplies are the best solution for new ESP installations, as well as for the reconstruction of existing facilities. The paper describes the topology of the HF HV power supply, power management and controls, and brings the most important details of the implementation. It is found that the HF HV solution achieves several significant improvements over the conventional thyristor system. It is possible to provide more precise control of the ESP parameters such as the output voltages and currents. It is also possible to make a rapid increase or decrease in voltage and to effectuate a very fast response to load changes. Due to this advantages it is possible to suppress the supply quickly in the case of sparking, reducing the spark energy and the quantity of ionized gasses produced by the electric arc. Reduction in the spark energy is up to 10 times compared to conventional thyristors solution. This means that the erosion of the electrode system is significantly reduced, and that the quality of the collection plates is preserved for much longer periods. At the same time, lower quantity of ionized gasses produced by the spark contribute to much shorter deionization intervals, required to quit sparking and evacuate charged particles in order to reinstate the voltage and proceed with the operation. In addition, HF HV power supply provides a significant reduction in size and weight of the complete ESP installation, hence reducing the tons of steel that has to be built in. Therefore, the HF HV power supply may be the key instrument to reducing the cost of the dedusting ecological equipment. Besides, size and weight reduction leads to cost savings of installation and maintenance. According to estimates, savings in steel may reach 30%, contributing to the overall cost savings of roughly 20%. Within this paper, in addition to describing the AR70/1000 unit topology and principles of operation, the paper presents the results and measurements obtained during extensive experimental investigations wherein performances of 50 Hz based thyristor units with T/R sets are compared to HF HV power supply.

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Sahoo, Ashwin Kumar, Nalinikanta Mohanty, and Anupriya M. "Modeling and Simulation of Superconducting Magnetic Energy Storage Systems." International Journal of Power Electronics and Drive Systems (IJPEDS) 6, no. 3 (September 1, 2015): 524. http://dx.doi.org/10.11591/ijpeds.v6.i3.pp524-537.

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This paper aims to model the Superconducting Magnetic Energy Storage System (SMES) using various Power Conditioning Systems (PCS) such as, Thyristor based PCS (Six-pulse converter and Twelve-pulse converter) and Voltage Source Converter (VSC) based PCS. Modeling and Simulation of Thyristor based PCS and VSC based PCS has been carried out. Comparison has also been carried out based on various criteria such as Total Harmonic Distortion (THD), active and reactive power control ability, control structure and power handling capacity. MATLAB/Simulink is used to simulate the various Power Conditioning Systems of SMES.

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43

Du, Guang Chao. "The Protection of Thyristor in Motor Control System." Advanced Materials Research 219-220 (March 2011): 908–13. http://dx.doi.org/10.4028/www.scientific.net/amr.219-220.908.

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The bearing ability of thyristor to over-voltage and over-current is poor. According to the causes lead to over-voltage and over-current , adopting over-voltage protection such as RC snubber, vristor, and so on, and limiting reactors, current sensing devices, fast fuses, etc. are used in fast over-current protection.

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44

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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Sosnina, Elena, Aleksandr Sevostyanov, Evgeny Kryukov, and Rustam Bedretdinov. "Thyristor Voltage Regulator Experimental Research." E3S Web of Conferences 209 (2020): 07020. http://dx.doi.org/10.1051/e3sconf/202020907020.

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The article is devoted to the thyristor voltage regulator (TVR) development. The TVR purpose is to control power flows and regulate voltage in 6-20 kV distribution electrical networks (DEN). The principle of TVR operation is based on the plus EMF (or minus EMF) introduction into power line when the shared use of longitudinal (change of magnitude) and transverse (change of phase) voltage regulation. The description of the TVR prototype is given. The TVR prototype consists of a 0.4 kV thyristor switches, power transformers (shunt and serial) and a 6 kV switchgear. The TVR has a two-level control system (CS). The TVR prototype experimental research was conducted in four stages: check of power equipment, first level CS research, second level CS research, prototype tests as a whole. The connection diagrams (thyristor switches unit, transformer and measuring equipment) and contact connections reliability were checked when the power part was tested. A qualitative characteristic of the input and output signals was obtained when testing the first level CS. It is found that the thyristor control pulses are formed according to the developed algorithm. The correctness of control system algorithms, executed and transmitted commands, passed and received data was confirmed as a result of the second level CS tests. The TVR research results indicate that the prototype provides the smoothness and specified accuracy of voltage regulation in all modes. The control range of the output voltage relative to the input was ±10%. The discreteness of regulation did not exceed 1.5%. The range of change in the shift angle of the output voltage relative to the input was ±5°. Research confirmed the TVR ES operability and its readiness for trial operation.

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Xu, Jian Guo, Jun Dong, Hao Zhang, Yu Jie Pei, and Xian Feng Li. "66 kV SVC Light Control Water-Cooled Valve Protection and Application." Applied Mechanics and Materials 543-547 (March 2014): 825–29. http://dx.doi.org/10.4028/www.scientific.net/amm.543-547.825.

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Improve power quality problems, the company introduced the "tag through 66kV Static dynamic reactive power compensation device (SVC)", which means water cooling valve parts, using the international advanced technology and light control thyristor, the real control cabinet and valve all-fiber connections between groups, no valve trigger circuit boards, etc., to ensure safe and reliable high-pressure environment. Light control while protecting 66kV more stable water-cooled manifold, also designed the various protection functions. Reactive power compensation device based on electrical design principle, the protection of the valve design principles, summarized the valve characteristic is a light-controlled thyristor trigger and pulse trigger laser fiber distribution device as one of the valve, the valve overcurrent analysis protection, undervoltage protection, return status display, RC protection, BOD protection, protection and cooling system valve structural protection, light control demonstrates the necessity of 66kV water cooling valve protection; through the reactive power compensation and benefits case situation the comparative analysis to verify the correctness of the application of SVC devices.

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Senulis, Audrius, Eleonora Guseinovienė, Viktoras Cirtautas, Valdas Jankūnas, and Lionė Urmonienė. "Control Efficiency Analysis of Linear Oscillating Mechatronic Device." Solid State Phenomena 147-149 (January 2009): 197–202. http://dx.doi.org/10.4028/www.scientific.net/ssp.147-149.197.

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This paper deals with the control efficiency analysis of the linear oscillating mechatronic device (linear oscillating synchronous motor–compressor). These mechatronic devices can be controlled by using thyristor control [1, 4], square-wave voltage [2, 3], ect. There is analyzed the case, when square-wave voltage pulses’ frequency is changed and so the piston stroke duration time is reduced. The control of piston stroke changes the energetic parameters of the mechatronic device. This type of controlling has one disadvantage – it needs a DC voltage source. The pulsating voltage control is based on thyristor control system and does not have the previously mentioned disadvantage, because uses the AC voltage source, but both control ways have influence to the energetic parameters due to higher harmonics. The analysis of the chosen mechatronic device (open-loop tests) is based on comparing the modeling and experimental results with respect to power losses, simplicity of the control, power factor and disturbances to the supply system. These results are important for the optimal design of the drive with oscillating synchronous pulsating current motors and the selection of control type for the different type of load.

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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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Shekar, M. S., M. Nandakumar, and B. J. Baliga. "An emitter switched thyristor with base resistance control." IEEE Electron Device Letters 14, no. 6 (June 1993): 280–82. http://dx.doi.org/10.1109/55.215198.

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Li, Jen-Hsing, and Tzuu-Hseng S. Li. "Multiloop control of thyristor-driven magnetic levitation system." Mechatronics 5, no. 5 (August 1995): 469–81. http://dx.doi.org/10.1016/0957-4158(95)00018-z.

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Journal articles on the topic 'Thyrister control'

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