Journal articles: 'Thyristor convertor'

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Liu, Hui Fang. "Non-Grid-Connected Wind Power DC Network Study Based on Hybrid Convertor." Advanced Materials Research 546-547 (July 2012): 295–300. http://dx.doi.org/10.4028/www.scientific.net/amr.546-547.295.

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Applying non-grid-connected wind power to high energy consuming industry has broad development prospects. This paper presents a compound DC power transmission net to realize high efficiency and reduce the loss. This net consists of current source converter (CSC) based on naturally commutated thyristor and voltage source converter (VSC) based on IGBT. Super capacitor connected to the load side stabilizes the wind power fluctuation. The coordinated control strategy of wind power, energy storage device and load is provided. Simulation results based on real wind power shows the validity of the system.

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Marsden, D. J. "Fixed-voltage thyristor convertor rolling-stock transformers to control DC traction motors." IEE Proceedings B Electric Power Applications 139, no. 3 (1992): 209. http://dx.doi.org/10.1049/ip-b.1992.0025.

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Yacamini, R., and J. W. Resende. "Thyristor controlled reactors as harmonic sources in HVDC convertor stations and AC systems." IEE Proceedings B Electric Power Applications 133, no. 4 (1986): 263. http://dx.doi.org/10.1049/ip-b.1986.0035.

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Li, Zhou, Xiao-Ping Zhang, and Qiu-Lan Wan. "Transfer characteristics of thyristor-based HVDC convertor in subsynchronous and low frequency band." International Transactions on Electrical Energy Systems 23, no. 6 (June 7, 2012): 835–45. http://dx.doi.org/10.1002/etep.1660.

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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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Fediv, Yevhen, Olha Sivakova, Vladyslav Lysiak, and Mykhailo Korchak. "Switching overvoltages protection of power electronics converters with gate turn-off thyristors." Energy engineering and control systems 7, no. 2 (2021): 103–10. http://dx.doi.org/10.23939/jeecs2021.02.103.

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Using the developed models in the “Simulink” visual programming environment of the “Matlab” application package using the “SimPowerSystem” and “Simscape Electrical” libraries, a comparative analysis of methods and techniques for limiting switching overvoltages in power converters, which are controlled by unlocking two-operation thyristors, was performed. The choice of a specific means of limitation is individual for each converter and depends on many factors - the power of the converter, the current-voltage characteristics of thyristors, the parameters of the power supply, and so on. Studies have shown that the most effective protection against voltage pulses with short duration and significant amplitude is the use of “Transient Voltage Suppressors” limiting diodes, the action of which is based on the use of avalanche breakdown during the time of thyristor unlocking.

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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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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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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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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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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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Shadab, Mirza Mohammad, Mohammad Arifuddin Mallick, Mohammad Tufail, and M. S. Jamil Asghar. "Development of a Novel Three Phase Grid-Tied Multilevel Inverter Topology." International Journal of Power Electronics and Drive Systems (IJPEDS) 7, no. 3 (September 1, 2016): 826. http://dx.doi.org/10.11591/ijpeds.v7.i3.pp826-834.

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The conventional line-commutated ac-to-dc converters/ inverters have square-shaped line current. It contains higher-order harmonics which generates EMI and it causes more heating of the core of distribution or power transformers. PWM based inverters using MOSFET/IGBT have higher switching losses, and the power handling capability and reliability are quite low in comparison to thyristors/ SCR. A thyristor based forced commutated inverters are not suitable for PWM applications due to the problems of commutation circuits. A pure sinusoidal voltage output or waveform with low harmonic contents is most desirable for ac load using dc to ac conversion. This paper presents a new multilevel inverter topology in which three phase ac- to-dc converter circuits are used in inversion mode by controlling the switching angle. Due to natural commutation, no separate circuit is required for synchronization. In this paper simulation and analysis are done for grid-tied three-phase 6-pulse, Two three-phase, 3-pulse and 12-pulse converter. These converters are analysed for different battery voltage and different switching angle combinations in order to reduce the total harmonic distortion (THD). Three-phase harmonic filters are further added to the grid side to reduce the harmonic content in the line current. A comparative study of these converters is also presented in this paper.

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Tarasovskij, Timofej S. "Simulation of transient processes of a thyristorreactor device for voltage regulation on load." Innotrans, no. 1 (2020): 69–72. http://dx.doi.org/10.20291/2311-164x-2020-1-69-72.

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The article presents a simulation model of a thyristor- reactor switching device (TRSD) created in the Matlab Simulink program. The model of a TRSD single- phase connected to a single-phase transformer has been created, and transients that occur during voltage regulation in a single-phase circuit are considered and analyzed. Supplement was introduced to the method for calculating TRSD thyristors. The developed model of a single phase of TRSD can be used to create models of converter transformers on traction substations with TRSD.

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Yodwong, Burin, Damien Guilbert, Matheepot Phattanasak, Wattana Kaewmanee, Melika Hinaje, and Gianpaolo Vitale. "AC-DC Converters for Electrolyzer Applications: State of the Art and Future Challenges." Electronics 9, no. 6 (May 29, 2020): 912. http://dx.doi.org/10.3390/electronics9060912.

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The main objective of the article is to provide a thorough review of currently used AC-DC converters for alkaline and proton exchange membrane (PEM) electrolyzers in power grid or wind energy conversion systems. Based on the current literature, this article aims at emphasizing the advantages and drawbacks of AC-DC converters mainly based on thyristor rectifier bridges and chopper-rectifiers. The analysis is mainly focused on the current issues for these converters in terms of specific energy consumption, current ripple, reliability, efficiency, and power quality. From this analysis, it is shown that thyristors-based rectifiers are particularly fit for high-power applications but require the use of active and passive filters to enhance the power quality. By comparison, the association combination of the chopper-rectifier can avoid the use of bulky active and passive filters since it can improve power quality. However, the use of a basic chopper (i.e., buck converter) presents several disadvantages from the reliability, energy efficiency, voltage ratio, and current ripple point of view. For this reason, new emerging DC-DC converters must be employed to meet these important issues according to the availability of new power switching devices. Finally, based on the authors’ experience in power conversion for PEM electrolyzers, a discussion is provided regarding the future challenges that must face power electronics for green hydrogen production based on renewable energy sources.

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Das, Bhaba P., Neville R. Watson, and Yonghe Liu. "Experimental Evaluation on the Influence of RCD Snubbers in a 3-Level Thyristor Based MLCR CSC." Journal of Engineering 2016 (2016): 1–18. http://dx.doi.org/10.1155/2016/2490926.

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Multilevel current reinjection (MLCR) concept provides self-commutation capability to thyristors, enabling thyristor based current source converters (CSC) to operate under negative firing angle. It also lowers the input current harmonic distortion. This is achieved by using an auxiliary reinjection bridge. Extensive experimental results are presented in this paper to analyse the performance of the 3-level MLCR CSC for different snubber components across the reinjection bridge. The trade-off in the choice of the snubber circuit is illustrated, with its influence on the AC side line current and DC side output voltage of the 3-level MLCR CSC.

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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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Onah, Aniagboso John. "Analysis of Controlled Single-phase Full-Wave Rectifier with RL Load." European Journal of Engineering Research and Science 3, no. 12 (December 7, 2018): 25–31. http://dx.doi.org/10.24018/ejers.2018.3.12.981.

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Diodes are popularly used in rectifiers, which convert an ac signal into a unidirectional signal. They produce a fixed output voltage only. However, controlled switches such as thyristors are used to vary the output voltage of a converter by adjusting the delay or firing angle α of the thyristors. Phase-controlled converters are simple, efficient and less expensive. There are both single-phase and three-phase converters depending on the input supply. We also have half-wave and full-wave converters. The half-wave converter has only one polarity of output voltage and current, while for the full converter, the polarity of the output voltage can be either positive or negative. The purpose of this paper is to investigate the operation of the Single-phase full-wave rectifier. Load current for the controlled full-wave rectifier with R-L load can be either discontinuous or continuous. The paper shows how the rectifier transits from discontinuous current operation to continuous current operation.

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Onah, Aniagboso John. "Analysis of Controlled Single-phase Full-Wave Rectifier with RL Load." European Journal of Engineering and Technology Research 3, no. 12 (December 7, 2018): 25–31. http://dx.doi.org/10.24018/ejeng.2018.3.12.981.

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Diodes are popularly used in rectifiers, which convert an ac signal into a unidirectional signal. They produce a fixed output voltage only. However, controlled switches such as thyristors are used to vary the output voltage of a converter by adjusting the delay or firing angle ? of the thyristors. Phase-controlled converters are simple, efficient and less expensive. There are both single-phase and three-phase converters depending on the input supply. We also have half-wave and full-wave converters. The half-wave converter has only one polarity of output voltage and current, while for the full converter, the polarity of the output voltage can be either positive or negative. The purpose of this paper is to investigate the operation of the Single-phase full-wave rectifier. Load current for the controlled full-wave rectifier with R-L load can be either discontinuous or continuous. The paper shows how the rectifier transits from discontinuous current operation to continuous current operation.

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Grekov, Eduard, Alexei Bezgin, Viktor Sorokin, and Ildar Yamansarin. "Comparison of Energy Indicators of the Electric Lift Drive of the Ekg-5 Excavator with Different Power Converters." Известия высших учебных заведений. Электромеханика 64, no. 3 (2021): 53–59. http://dx.doi.org/10.17213/0136-3360-2021-3-53-59.

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The energy indicators of the EKG-5 excavator lifting electric drive with thyristor power circuits have been determined according to the systems thyristor direct frequency converter - two-phase asynchronous electric motor, converter-DC motor and direct frequency converter - three-phase asynchronous electric motor. Losses in electric motors and converters have been determined, taking into account the specifics of their joint work in theefficiency for the excavation cycle were determined based on the results of calculating the simulation model, the initial data for which were the parameters of the excavation cycle of the lift drive of a real excavator. Distortion coefficients of the mains current were determined for two cases: during digging and during accelerated lowering of an empty bucket. For comparison, the energy indicators of the selected electric drives with a filter-compensating device were calculated. The analysis of energy indicators is made.

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Sun, Yuan Yuan, and Chao Wang. "Characteristic Analysis of the Coupled Harmonic Model and its Application in Harmonic Power Flow." Advanced Materials Research 383-390 (November 2011): 1977–82. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.1977.

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This paper first gives out the harmonic coupled equivalent model for the Thyristor Controlled Reactors (TCRs) and the converter. Then, the harmonic generating characteristics of the TCRs and the converter are investigated based on the proposed model. With the help of the equivalent model, the impact of each harmonic contribution component is quantified. Moreover, based on the characteristics analysis of the model, two simplified model are proposed which are useful for simplifying the harmonic analysis of systems with TCRs and converters.

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Panteleev, V. I., I. S. Kuzmin, A. A. Zavalov, A. V. Tikhonov, and E. V. Umetskaia. "Power quality in power supply systems of mining and processing enterprises in Russia." Proceedings of Irkutsk State Technical University 25, no. 3 (July 6, 2021): 356–68. http://dx.doi.org/10.21285/1814-3520-2021-3-356-368.

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This paper investigates the effect of the load factor of frequency converters and thyristor converters on electrical power quality. Recommendations for reducing the influence of higher harmonics and switching overvoltages on the characteristics of electrical power are provided. Higher harmonics were measured by a PKK57 complex device for controlling electrical parameters and a digital oscilloscope of the Tektronix TDS 2024V type. Impulse switching overvoltages were recorded by an active resistance divider of the DNEK-10 type and the above-mentioned oscilloscope. The obtained data were processed by the Loginom 6.4 software and the methods of mathematical statistics. The lower threshold level of the load factor of frequency converters and thyristor converters was set equal to 0.8, at which the sinusoidal distortion of voltage curves correspond to the RF standard of electrical power quality. The suppression degree of higher harmonics from the 5th to 17th frequency by power transformers with a capacity of 250–6,300 kV. A ranged from 95 to 45%. The use of the ‘transformer–converter–electric receiver’ system as applied to the power supply systems of mining and processing enterprises was substantiated. It was shown that electric motors with a capacity of up to 2,500 kW inclusively require protection against switching overvoltages. Conventional RC-absorbers based on RC-circuits connected to the terminals of electric motors are shown to be highly efficient for protecting electric motors against switching overvoltages. Thus, the quality of electrical power in power supply systems of mining and processing enterprises in Russia can be ensured by frequency converters and thyristor converters with a load factor of 0.8 or greater. Provided that the transformer capacity does not exceed 1,000 kV. A, a more efficient and less expensive ‘transformer–converter–electrical receiver’ system is recommended. Effective protection of electric motors of up to 2,500 kW inclusive can be provided using the proposed conventional RC absorber, which maintains the overvoltage rate at a level not exceeding 1.7.

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Kalpaktsoglou, Dimitrios, Anastasios Tsiakalos, and Μanos Roumeliotis. "The Thyristor Switched Parallel Capacitors (TSPC) Converter for Power Factor Correction in Wind Power Systems." WSEAS TRANSACTIONS ON POWER SYSTEMS 16 (August 4, 2021): 149–56. http://dx.doi.org/10.37394/232016.2021.16.15.

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This paper presents a novel power factor correction circuit suitable for low-speed electric generators usually used in direct drive wind turbines. The Thyristor Switched Parallel Capacitors (TSPC) circuit belongs to the Controlled Series Capacitor (CSC) circuits. Those circuits have been used in power transmission lines to correct the power factor and improve the performance of the electrical system. Such a circuit can be used in wind power systems to improve and maximize the efficiency of a wind turbine. A typical direct-drive wind power system employs variable speed electric generators, but the downside is that systems like that suffer from high and variable inductive reactance. In order to correct the power factor and to improve the efficiency of the system, the inductive reactance of the generator must become equal in value to the capacitive reactance. A TSPC circuit uses a set of capacitors, connected in series with anti-parallel thyristors. In every cycle, a controller triggers the appropriate thyristors, allowing the current to pass from the capacitor which then provides the system with the capacitive reactance that matches the generator’s inductor reactance. Therefore, the TSPC circuit is able to counteract for any reactive losses and improve the power factor, as well as, the efficiency. This paper introduces this novel power factor correction circuit that employs capacitors in parallel configuration. This circuit was simulated in PSPICE and was implemented and tested in the lab. Based on the simulation and implementation results, we discuss the benefits as well as the drawbacks of the proposed circuit

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Chen, Xiaojiao. "Transient DC Over-Voltage Protection for ITER PF AC/DC Converter." CPSS Transactions on Power Electronics and Applications 6, no. 4 (December 2021): 276–80. http://dx.doi.org/10.24295/cpsstpea.2021.00026.

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The International Thermonuclear Experimental Reactor (ITER) poloidal field (PF) AC/DC converters are composed by thyristor-based phase controlled converter modules. As the core component of ITER PF AC/DC converter, the thyristor is very sensitive to over-voltage and damaged in microseconds, therefore, the transient over-voltage protection strategy is desperately essential to ensure the converter safety operation. In this paper, a nanosecond respond and high reliability protection strategy which combined by Metal Oxide Varistor (MOV) and external bypass is proposed to protect the ITER PF AC/DC converter from transient DC over-voltage. The MOV is designed to certify the fast respond in nanosecond. Moreover, a bidirectional BreakOver Diode (BOD) circuit board is designed to activate external bypass to ensure the reliability of the transient DC over-voltage protection strategy. The performance-testing platform is built to study its performance. The experiments on ITER PF AC/DC converter test facility are carried out. According to the experiment results, the external bypass is triggered by BOD board effectively and the load current is transferred to the external bypass in 2 us when BOD suffers from an over-voltage. The effectiveness of the proposed transient DC over-voltage protection strategy is verified.

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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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Grabchuk, B. L., and Yu F. Romaniuk. "Analysis of energy flows in the power supply system with a thyristor voltage converte." METHODS AND DEVICES OF QUALITY CONTROL, no. 1(44) (June 28, 2020): 65–75. http://dx.doi.org/10.31471/1993-9981-2020-1(44)-65-75.

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A numerical analysis of energy flows in a three-phase power supply system with a sine wave EMF source, active load and a thyristor converter that distorts the sine waveform and generates higher harmonics is performed. The influence of the thyristor non-sinusoidal voltage on the energy flows and the power factor of the source is analyzed. Thyristor converter is considered as a nonlinear electric power unit consuming electricity from the primary power source at a fundamental frequency, part of which is converted and returned back to the network as a secondary energy stream of zero-sequence systems and higher harmonics, thereby reducing the overall power factor and the quality of electricity becomes worse. It is analyzed the influence of the considered harmonics quantitative composition on the accuracy of the currents and voltages calculations. The dependence of the higher harmonics amplitudes on the thyristor firing angle is established. The constant component and the 2nd order harmonic voltage are the most denoted in the thyristor harmonics spectrum. In general case it is shown that in the nonlinear circuit with a sinusoidal power source, even in the absence of inductive and capacitive electric load, the fundamental current harmonic of the power source does not coincide in phase with the sinusoidal EMF of the source. Thus, the thyristor can be considered as a reactive inductive element that consumes reactive power of the fundamental frequency of current, regardless of the its firing angle and the presence of other reactive elements in the system. Therefore, in order to increase the power factor, it is necessary to compensate the reactive power of displacement only at the current fundamental frequency, which should be recorded by electronic meters. It is proposed to use the relative current value of the first harmonic of the power source to characterize the effect of the secondary energy flow on the total power factor. In a four-wire network, the presence of a thyristor converter causes a significant current increasing in the neutral wire, even under symmetrical phase loading, due to the zero sequence currents flowing, which are multiple of three, and they must be taken into account during wire cross-section selection and power losses calculation. It is proposed the practical measures to limit the level of higher harmonics and improve the electricity quality.

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Duranay, Zeynep Bala, and Hanifi Guldemir. "Simulation of boost AC-AC converter using single-phase matrix converter." International Journal of Applied Power Engineering (IJAPE) 10, no. 4 (December 1, 2021): 307. http://dx.doi.org/10.11591/ijape.v10.i4.pp307-314.

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Generally, AC-AC converters are implemented using thyristors. These converters generate harmonics and have a low power factor. To eliminate these problems matrix converters (MC) are become used as AC-AC converter. Matrix converters have the capability of being used as frequency changer, rectifier, inverter and chopper. In this work, it is proposed to achieve the desired output of AC-AC Boost converter using single phase matrix converter (SPMC). The operation of single-phase AC-AC boost converter using MC is studied in this paper. The output voltage of this boost converter is higher than the AC input supply voltage. insulated gate bipolar transistors (IGBTs) are used as the switching elements in the SPMC power circuit. Sinusoidal Pulse width modulation (SPWM) technique is applied to generate switching signals to obtain the output voltage. The model of the matrix converter is constructed in MATLAB/Simulink programming software package. The behavior of SPMC is simulated with various switching frequencies. The simulation results together with harmonic spectrum and total harmonic distortion (THD) values are presented. Successful operation of boost SPMC is achieved.

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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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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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Kozak, Maciej, Artur Bejger, and Arkadiusz Tomczak. "Identification of Gate Turn-Off Thyristor Switching Patterns Using Acoustic Emission Sensors." Sensors 21, no. 1 (December 24, 2020): 70. http://dx.doi.org/10.3390/s21010070.

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Modern seagoing ships are often equipped with converters which utilize semiconductor power electronics devices like thyristors or power transistors. Most of them are used in driving applications such as powerful main propulsion plants, auxiliary podded drives and thrusters. When it comes to main propulsion drives the power gets seriously high, thus the need for use of medium voltage power electronics devices arises. As it turns out, power electronic parts are the most susceptible to faults or failures in the whole electric drive system. These devices require efficient cooling, so manufacturers design housings in a way that best dissipates heat from the inside of the chips to the metal housing. This results in susceptibility to damage due to the heterogeneity of combined materials and the difference in temperature expansion of elements inside the power device. Currently used methods of prediction of damage and wear of semiconductor elements are limited to measurements of electrical quantities generated by devices during operation and not quite effective in case of early-stage damage to semiconductor layers. The article presents an introduction and preliminary tests of a method utilizing an acoustic emission sensor which can be used in detecting early stage damages of the gate turn-off thyristor. Theoretical considerations and chosen experimental results of initial measurements of acoustic emission signals of the medium voltage gate turn-off thyristor are presented.

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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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Szczesniak. "Challenges and Design Requirements for Industrial Applications of AC/AC Power Converters without DC-Link." Energies 12, no. 8 (April 25, 2019): 1581. http://dx.doi.org/10.3390/en12081581.

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AC/AC converters that do not have a DC energy storage element, such as a matrix chopper and a matrix converter, are increasingly becoming alternatives to conventional two-stage AC/DC/AC converters and thyristor choppers. In such systems, the main DC-link capacitor does not exist, so the system provides more reliable operation and makes it possible to reduce the financial costs of its construction. It should be noted that AC/AC converters without an energy storage element in a form of DC-link capacitors have not been implemented on an industrial scale. The reasons involve technical aspects and cost components. The main aim of this paper is to present some of the challenges and selected design requirements for industrial applications of AC/AC high reliability power converters.

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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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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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Qi, Lei, Zhiyuan Shen, Jianjian Gao, Guoliang Zhao, Xiang Cui, and Wei Kang. "Wideband modeling and transient analysis of sub-module in modular multilevel converter." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 36, no. 6 (November 6, 2017): 1792–805. http://dx.doi.org/10.1108/compel-12-2016-0582.

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Purpose This paper aims to establish the wideband model of a sub-module in a modular multilevel converter (MMC) and analyze the switch transients of the sub-module. Design/methodology/approach The paper builds an MMC sub-module test circuit and conducts dynamic tests both with and without the bypass thyristor. Then, it builds the wideband model of the MMC sub-module and extracts the model parameters. Finally, based on the wideband model, it simulates the switch transients and analyzes the oscillation mechanism. Findings The dynamic testing shows the bypass thyristor will add oscillations during switch transients, especially during the turn-on process. The thyristor acts like a small capacitor and reduces the total capacitor in the turn-on circuit loop, thus causing under-damped oscillations. Originality/value This paper found that the bypass thyristor will influence the MMC sub-module switch transients under certain circumstances. This paper proposes a partial inductance extraction procedure for the MMC sub-module and builds a wideband model of the sub-module. The wideband model is used to analyze and explain the switch transients, and can be further used for insulated gate bipolar transistor switch oscillation inhibition and sub-module design optimization.

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Kim, Kyeong-Tae, Byung-Moon Han, Jae-Hun Jung, Eui-Cheol Nho, Yong-Ho Chung, and Seung-Taek Baek. "A New Synthetic Test Circuit for Testing Thyristor Valve in HVDC Converter." Transactions of the Korean Institute of Power Electronics 17, no. 3 (June 20, 2012): 191–97. http://dx.doi.org/10.6113/tkpe.2012.17.3.191.

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Islam, Md Saiful, Md Rifat-Ul-Karim Shovon, and Abdul Goffar Khan. "Comparative Study of Thyristor vs IGBT Based AC-DC Power Converter." AIUB Journal of Science and Engineering (AJSE) 17, no. 3 (November 30, 2018): 89–102. http://dx.doi.org/10.53799/ajse.v17i3.14.

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This paper presents a comparative study of the application of Thyristor versus IGBT in AC-DC controlled power converter. Both simulation and practical experiment have been carried out to test the relationship between the average output voltage (Vdc) with firing angle (α, for Thyristor) and triggering pulse width (, for IGBT). Also the total harmonic distortion (THD) has been observed in both the cases. It is observed that IGBT based power converter introduces more harmonics in the system, in spite of more symmetrical output voltage wave shape.

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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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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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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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Kwon, Jung-Min. "Composite Energy Storage System with Photovoltaic Power Generation and Uninterruptible Power Supply Function." International Journal of Photoenergy 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/830341.

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A composite energy storage system (CESS) that includes a photovoltaic (PV) power generation and an uninterruptible power supply (UPS) function is proposed. This system has three operating modes, namely, a grid-connected inverter mode, a grid-connected rectifier mode, and an islanding mode. This system is composed of a boost converter, a three-phase inverter/rectifier, a bidirectional DC/DC converter, and thyristor switches. The boost converter extracts maximum power from the PV panels and sends it to the DC-link. The bidirectional DC/DC converter is connected between the battery and the DC-link, which leads to an optimized charging/discharging operation. The three-phase inverter/rectifier transmits the power to and from the grid. Also, it operates as a UPS in the islanding mode. The thyristor switches are used for connecting/disconnecting between the grid and the AC load. A 15 kW prototype is implemented to verify the performance of the proposed system.

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Yu, Gui Yin. "The High-Power of DC Power with Auto Tracking Power Frequency." Advanced Materials Research 383-390 (November 2011): 321–24. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.321.

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This paper analyzes the reason that the common thyristor trigger is unable to fulfill power supply in wide range changes of frequency. The high precise frequency/voltage converter is used to monitor and track frequency changes of the simultaneous power supply. The simultaneous signal and charge current source are provided by the converter for saw tooth wave trigger. The frequency of saw tooth wave changes as the same time the frequency of power supply changes in wide range. However, the amplitude of the saw tooth wave can be kept constant. This can achieve the controlled angle of the thyristor trigger does not change with the large-scale voltage frequency changes of the simultaneous power supply when the same Phase-shifted control voltage was used.

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Stala, R., S. Piróg, A. Penczek, A. Kawa, Z. Waradzyn, A. Mondzik, and A. Skała. "A family of high-power multilevel switched capacitor-based resonant DC-DC converters – operational parameters and novel concepts of topologies." Bulletin of the Polish Academy of Sciences Technical Sciences 65, no. 5 (October 1, 2017): 639–51. http://dx.doi.org/10.1515/bpasts-2017-0069.

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Abstract This paper presents the concept of topologies and investigation results of switched-capacitor voltage multipliers designed for application in high power systems. The analyzed family of multilevel converters includes established topologies as well as novel concepts. The application of thyristors as well as the invention of novel concepts of multiplier topologies and appropriate control make it possible to achieve high efficiency, high voltage gain, reliable and simple DC-DC converters for high power systems. Based on analytical models of the SCVMs, the paper presents a discussion of the selection of components and the efficiency of the converters as a function of converted power as well as the voltage range on the input and the output side. The results are supported by computer simulations and demonstrative experimental tests.

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Okada, Sadayuki, Hisao Sonobe, Takamasa Hori, and Yutaka Suzuki. "Constant pressure evaporative cooling system for thyristor converter." IEEJ Transactions on Power and Energy 105, no. 8 (1985): 637–44. http://dx.doi.org/10.1541/ieejpes1972.105.637.

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Wang, Zhen, and Lei Feng. "Research on HVDC Converter Valve Thyristor Overvoltage Protection." Journal of Physics: Conference Series 1325 (October 2019): 012211. http://dx.doi.org/10.1088/1742-6596/1325/1/012211.

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Sharaf, A. M., Yude Yao, and R. Wu. "Thyristor converter-modulated impedance under unbalanced system conditions." Electric Power Systems Research 11, no. 1 (August 1986): 59–69. http://dx.doi.org/10.1016/0378-7796(86)90059-3.

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Mikolajuk, Kazimierz, and Witold S. Kropacz. "Canonical structures of DC-AC thyristor converters." International Journal of Circuit Theory and Applications 14, no. 1 (January 1986): 1–33. http://dx.doi.org/10.1002/cta.4490140101.

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Luo, F. L., and R. J. Hill. "System analysis of digitally controlled thyristor converters." Transactions of the Institute of Measurement and Control 8, no. 1 (January 1986): 39–45. http://dx.doi.org/10.1177/014233128600800106.

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Djaborov, Mehrubon Mahmadqulovich, Sergey Vladimirovich Myatezh, and Nikolay Ivanovich Shchurov. "Itinerant Phase Converter with Improved Energy Performance." Applied Mechanics and Materials 792 (September 2015): 183–88. http://dx.doi.org/10.4028/www.scientific.net/amm.792.183.

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At present, the control system of electric traction motors is widely used in four-regulators collected on thyristors in a bridge rectifier circuit. The feature switching processes in them are needed to introduce an artificial delay of the thyristors opening angle, which reduces the average value of the power factor up to 0.8. The article assesses the effectiveness of the combination of the rectified voltage from the point of view of increasing the energy performance of the band rectifiers for controlling the traction motor freight locomotives operating on alternating current. With this regulation the greatest effect is achieved in the first control zone, under normal conditions when the power factor is particularly low (0.2 ... 0.6). The expected improvement of the average power factor of the first zone will be about 22%, and taking into account the duration of the performance in all working areas, it should be about 5-10%

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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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Wu, Tong Tong. "Converter Station VBE Signal Monitoring System Based on LabVIEW." Advanced Materials Research 1044-1045 (October 2014): 918–21. http://dx.doi.org/10.4028/www.scientific.net/amr.1044-1045.918.

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Valve base electronic systems (VBE) achieve the effect of controlling the rectifier and inverter by triggering the thyristor breakover or turn-off. This paper based on the LabVIEW interface display software, through the data acquisition card, Art USB2830, real-time acquire the main signal of VBE, namely monitoring the main signal of system, in order to analyze the causes and location of system failure.

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Journal articles on the topic 'Thyristor convertor'

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