Journal articles: 'Static frequency converter'

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CALININ, Lev, Dmitrii ZAITEV, Mihai TIRSU, Irina GOLUB, and Danila KALOSHIN. "Characteristics of two channel static frequency converter." EMERG - Energy. Environment. Efficiency. Resources. Globalization 7, no. 3 (2021): 62–74. http://dx.doi.org/10.37410/emerg.2021.3.05.

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Baraston, Arnaud, Laurent Gerbaud, and Jean-Luc Schanen. "Design by optimization of controlled static converters with EMC filters in aeronautics." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 37, no. 2 (March 5, 2018): 591–602. http://dx.doi.org/10.1108/compel-12-2016-0522.

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PurposeWith the increasing number of onboard controlled static converters in aeronautics, methods to design lighter configurations are required. This study aims to help the designer sizing optimal electromagnetic compatibility (EMC) filters and, moreover, finding optimal voltage levels and switching frequency, which have a great impact on the design and global mass of such converters. Design/methodology/approachAnalytical models for capacitors, inductors and heatsink are settled. Using frequency modeling, EMC can be studied analytically. To deal with frequency and voltages variations, models of perturbations sources are developed. Concerning the problem of surveilling thousands of harmonics to check the whole frequency range of EMC standards in optimization, a strategy that drastically reduces the number of computations and has a good convergence is proposed. FindingsThe methods settled in the paper allow to optimize a controlled static converter with its EMC filters along with finding optimal switching frequency and voltage levels. A study on a three-phase rectifier reveals the importance of the switching frequency on converter design with EMC filters. A 28 per cent mass reduction is predicted by increasing the switching frequency from 10 to 30 kHz. The designed converters are verified by simulations. Research limitations/implicationsInvestigating the voltage levels along with the switching frequency has not been achieved yet for static controlled converters with EMC constraints. The approach lacks experimental validations, but it is currently ongoing. Originality/valueDealing analytically with the changes of frequency or voltages in an EMC study is a new feature. The possibility to use deterministic algorithm is essential for dealing with the important number of constraints and the numerous interactions between all the parts of the problem, especially EMC.

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Kneschke, Tristan A. "Static Frequency Converter for SEPTA's Wayne Junction Traction Substation." IEEE Transactions on Industry Applications IA-21, no. 2 (March 1985): 295–300. http://dx.doi.org/10.1109/tia.1985.349628.

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Kishore, G. Indira, and Ramesh Kumar Tripathi. "High Gain Single Switch DC-DC Converter Based on Switched Capacitor Cells." Journal of Circuits, Systems and Computers 29, no. 12 (February 26, 2020): 2050188. http://dx.doi.org/10.1142/s0218126620501881.

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With photovoltaic or fuel cell as a source, the high voltage required at DC bus as input for inverter can be obtained by high gain DC-DC converters. This can be achieved by implementing switched capacitor (SC) cells. Switched capacitors have the ability to produce high static gain and at the same time, they limit the voltage stress across the components. This paper proposes a high static gain, single switch DC converter based on the SC cells to develop high gain. These cells not only boost the voltage gain but also reduce the voltage stress at the active components. This converter also features a single active switch, low input ripple current through the inductor, absence of snubber circuit as the proposed converter does not assist the voltage spike across the active switch. The proposed converter allows high switching frequency and therefore results in a smaller size. The voltage gain can be increased further by adding the switched cells. In this paper, the operation in CCM, DCM, and design of components for the proposed converter is discussed. The MATLAB/SIMLINK and hardware-based studies for the proposed converters have been discussed to validate the specified features.

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Yuan, Zhan Jun, and Jin Wang. "Design of New Frequency Converter Based on TMS320LF2407A." Advanced Materials Research 466-467 (February 2012): 809–13. http://dx.doi.org/10.4028/www.scientific.net/amr.466-467.809.

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In order to improve voltage utilization ratio and dynamic performance of frequency converter, this paper presents a digital frequency converter design scheme based on digital signal processor TMS320LF2407A and the theory of space vector pulse width modulation (SVPWM) technology, provides its detailed design measures of software and hardware and SVPWM algorithm realization methods. The experimental results prove that this new frequency converter has simple structure, high control precision, higher voltage utilization ratio, better dynamic and static property.

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Fischer, J., E. Amirante, A. Bargagli-Stoffi, and D. Schmitt-Landsiedel. "Adiabatic circuits: converter for static CMOS signals." Advances in Radio Science 1 (May 5, 2003): 247–51. http://dx.doi.org/10.5194/ars-1-247-2003.

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Abstract. Ultra low power applications can take great advantages from adiabatic circuitry. In this technique a multiphase system is used which consists ideally of trapezoidal voltage signals. The input signals to be processed will often come from a function block realized in static CMOS. The static rectangular signals must be converted for the oscillating multiphase system of the adiabatic circuitry. This work shows how to convert the input signals to the proposed pulse form which is synchronized to the appropriate supply voltage. By means of adder structures designed for a 0.13µm technology in a 4-phase system there will be demonstrated, which additional circuits are necessary for the conversion. It must be taken into account whether the data arrive in parallel or serial form. Parallel data are all in one phase and therefore it is advantageous to use an adder structure with a proper input stage, e.g. a Carry Lookahead Adder (CLA). With a serial input stage it is possible to read and to process four signals during one cycle due to the adiabatic 4-phase system. Therefore input signals with a frequency four times higher than the adiabatic clock frequency can be used. This reduces the disadvantage of the slow clock period typical for adiabatic circuits. By means of an 8 bit Ripple Carry Adder (8 bit RCA) the serial reading will be introduced. If the word width is larger than 4 bits the word can be divided in 4 bit words which are processed in parallel. This is the most efficient way to minimize the number of input lines and pads. At the same time a high throughput is achieved.

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Makarov, V. A., F. A. Korolev, and R. E. Tyutyaev. "Sensors of Rapidly Changing Pressure Based on Jet Force." Proceedings of Higher Educational Institutions. Маchine Building, no. 1 (730) (January 2021): 34–40. http://dx.doi.org/10.18698/0536-1044-2021-1-34-40.

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Static and dynamic characteristics of rapid response pneumatic digital systems are determined with the help of pneumatic-galvanometric sensors that consist of pneumatic optical converters, electrical bridge circuits and magnetoelectric galvanometers. This paper presents theoretical and experimental studies of the pneumatic optical converter whose mode of operation is based on the jet force effect on a plate of limited dimensions commensurate with the dimensions of the contact area between the jet and the plate. The investigations are based on the equality of moments of the jet force and the counter-moment of the rod that the plate is fixed on. The sensitivity and other static characteristics of the converter (linearity, measurement rage) as well as other parameters necessary for interpreting the readings, calculating errors and calibrating the scale are determined. The natural frequency is sufficient to control dynamic processes controlled by pneumatic systems. For the design of converters, it is proposed to use the aggregate criterion of the quality factor that equals the product of the sensitivity and the natural frequency squared. The performed calculations are verified by experiments.

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Kuz’kin, V. I., V. N. Meleshkin, S. V. Myasishchev, and I. S. Khromov. "A static frequency converter in composition of high-speed rectifier drive." Russian Electrical Engineering 81, no. 7 (July 2010): 372–76. http://dx.doi.org/10.3103/s1068371210070060.

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Tatuyko, Pavel. "MODEL OF MANAGING PROCESSES OF ENGINEERING CHANGES IN PRODUCTS AT AN INDUSTRIAL ENTERPRISE." Automation and modeling in design and management, no. 1 (March 17, 2022): 73–79. http://dx.doi.org/10.30987/2658-6436-2022-1-73-79.

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The aim of the work is to determine promising converters for supplying consumer devices with the required voltage level. As part of the task implementation, a mathematical description of the resonant converter with a series LC resonant circuit is made. The equivalent replacement circuit of the converter is given, as a result of its analysis analytical expressions are determined that describe the main dependences of this converter on the load and switching frequency of the keys. In the process of analyzing the resonant converter operation with a series LC resonant circuit, mathematical modelling methods are used. The result of the work is the obtained analytical expressions that allow determining the oscillatory circuit parameters for the resonant converter operation with a series LC resonant circuit in the mode with the highest efficiency. The presented graphs demonstrate the key parameter dependence of the oscillatory circuit on the load magnitude and on the switching frequency of semiconductor keys, and, accordingly, on the oscillatory circuit frequency. Applying a resonant converter with a series LC resonant circuit is possible in those areas where a static load is used that changes little over time. Applying this converter is not optimal for a dynamic load, because to maintain the output voltage at the required level, it will be necessary to complicate the control system and introduce pulse-width modulation in addition to pulse-frequency one and to control the converter by means of skipping control pulses in the case when an operating mode is close to the idle one.

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Wang, De Shun, Bo Yang, and Lian Tao Ji. "Research and Develop on Static Frequency Converter of Pumped Storage Power Plant." Advanced Materials Research 608-609 (December 2012): 1120–26. http://dx.doi.org/10.4028/www.scientific.net/amr.608-609.1120.

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A static frequency converter start-up control strategy for pumped-storage power unit is presented. And rotor position detecting without position sensor is realized according to voltage and magnetism equations of ideal synchronous motor mathematics model. The mechanism and implementation method of initial rotor position determination and rotor position estimation under low frequency without position sensor are expounded and validated by simulations. Based on the mentioned control strategy, first set of a static frequency converter start-up device in China for large-scale pumped-storage unit is developed, which is applied to start-up control test in the 90 MW generator/motor of Panjiakou Pumped-storage Power Plant. Test results show that rotor position detecting, pulse commutation, natural commutation, and unit synchronous procedure control of static start-up are all proved. The outcomes have been applied in running equipment, which proves the feasibility of mentioned method.

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Vedernikov, Alexander S., and Dmitry I. Dunaev. "Correction of the static characteristic of a frequency converter to reduce the amplitudes of resonance vibrations of the vibrating table." Vestnik of Samara State Technical University. Technical Sciences Series 29, no. 2 (August 30, 2021): 117–28. http://dx.doi.org/10.14498/tech.2021.2.8.

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It is known that vibration systems of directional vibrations based on asynchronous vibration motors are currently widely used in practice, but at the same time they have a significant drawback - a sharp increase in vibration amplitudes when passing through the resonance zone at the time of acceleration and deceleration of vibration motors, which negatively affects their operation. The article discusses a vibration table with two unbalanced asynchronous vibration motors. The calculation scheme and equations of motion of such a vibration system are presented. It is shown that the vibration table as a control object is an oscillatory link with a pronounced resonant frequency. The equations of motion of asynchronous vibration motors with scalar frequency control are given. A structural diagram of a vibration table with unbalanced exciters has been developed, the modeling of which made it possible to determine the amplitudes of resonant oscillations. It is proposed to apply correction of the static characteristics of the frequency converter, which connects the effective value of the output voltage with the frequency, to reduce the resonance amplitudes. Equations of the desired static characteristics of the inverter and analytical dependences for calculating the necessary coefficients for its implementation are given. A computational model has been developed that makes it possible to take into account the effect of the corrected static characteristic of the frequency converter on the operation of the vibrating table at the stages of acceleration and deceleration. The results of computer simulation are given, convincingly showing that the correction of the static characteristics of the inverter is an effective means of reducing the amplitudes of resonant oscillations. It is shown that modern frequency converters have functionality that makes it easy to correct the dependence of the effective value of the output voltage on the frequency. The need to adjust the static characteristics of the inverter for a specific type of product tested on the vibration table is noted.

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BUZATU, N. R., A. LAZAR, D. ALEXA, G. A. LAZAR, and M. MOISA. "Static Frequency Converter with RNSIC Converter and Double Branch Inverter for Supplying Three-Phase Asynchronous Motors." Advances in Electrical and Computer Engineering 10, no. 3 (2010): 66–70. http://dx.doi.org/10.4316/aece.2010.03011.

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Agunov, A. V., A. T. Burkov, V. G. Zhemchugov, and K. K. Stepanova. "Energy efficiency of power electronics converters in traction power supply networks at voltage increase." Journal of Physics: Conference Series 2131, no. 4 (December 1, 2021): 042094. http://dx.doi.org/10.1088/1742-6596/2131/4/042094.

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Abstract The main features of the procedure for predicting electrical losses in power semiconductor converters of AC-DC and DC-AC systems of high voltage DC traction are presented. The procedure is based on simulation of multi-cycle switching of IGBT modules in combination with simulation of static and dynamic switching losses in traction converter circuits. The models take into account the switching frequency, physical processes in the formation of voltage and current diagrams at transition processes and in the static state of the switch elements. The model of loss assessment using particular types of IGBT modules is the basis for calculating the energy efficiency characteristics of traction converters for advanced high-voltage direct current traction systems.

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Engleitner, Raffael, José Renes Pinheiro, Fábio Ecke Bisogno, Matthias Radecker, and Yujia Yangy. "Normalized statical analysis with frequency and load variation for the class-E converter based on piezoelectric transformers." Sba: Controle & Automação Sociedade Brasileira de Automatica 22, no. 6 (December 2011): 573–84. http://dx.doi.org/10.1590/s0103-17592011000600003.

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Piezoelectric transformers (PTs) allow the design of promising power supply applications, increasing efficiency, reducing size, facilitating the achievement of high transformation ratio, besides providing high immunity against electromagnetic noise. Due to the electrical equivalent model having resonant characteristics, some resonant topologies are used to build these power supplies, i.e. the Class-E converter. In order to make easier the analysis of high order converters, it's possible to use a normalized analysis method. The control of the Class-E converter using PTs is implemented through the switching frequency and duty cycle variation. The static gain is achieved though the switching frequency variation, while the duty cycle is adjusted with the purpose of achieving soft switching for different frequencies and loads. This paper shows a normalized analysis of this process, including a normalized frequency and load variation, without the need of design parameters. Experimental results for a 3W step-down converter are shown for a universal 85-260VAC input and out put voltage 6 V DC, to validate the proposed method.

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Tran, Le Nhat Hoang, Laurent Gerbaud, Nicolas Retière, and Hieu Nguyen Huu. "Use of SQP optimization algorithm to size a multiphysical system." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 37, no. 2 (March 5, 2018): 661–80. http://dx.doi.org/10.1108/compel-12-2016-0519.

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PurposeStatic converters generate current harmonics in power grids. For numerous studies, analytical frequency modeling is preferred to carry out their harmonic modeling in the context of sizing by optimization. However, a design by optimization has to consider other constraints, e.g. modeling constraints and operating constraints. In this way, this paper aims to focus on applying an analytical frequency modeling on the sizing by optimization of an aircraft electrical power channel. Design/methodology/approachThe paper aims to size a multiphysical system by optimization. In this way, the sizing of an aircraft electrical power channel by optimization has been carried out. The models of all the channel components are analytical. Specifically, the frequency model of the power electronics is based on Tran et al. (2016) and is made of equalities and inequalities. Due to this modeling choice, the optimization satisfies hundreds of constraints, such as modeling constraints and static converter operating constraints. Furthermore, transient constraints are only verified after optimization. FindingsThe difficulty is the modeling of the system by taking into account nonlinear implicit equations having several solutions. A solution is the addition of inequality constraints to the model to guide the implicit solving. Furthermore, this greatly helps the optimization algorithm to find the good operating mode of the static converter, at steady state. This aspect is indispensable to validate the sizing model. Research limitations/implicationsThe number of the configurations per operating period of the static converters is defined a priori and limited. Originality/valueThe analytical model for the sizing is formulated as a constrained optimization problem. Its solving and the sizing by optimization are carried out by the same optimization algorithm.

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Rohten, Jaime, Felipe Villarroel, Esteban Pulido, Javier Muñoz, José Silva, and Marcelo Perez. "Stability Analysis of Two Power Converters Control Algorithms Connected to Micro-Grids with Wide Frequency Variation." Sensors 22, no. 18 (September 19, 2022): 7078. http://dx.doi.org/10.3390/s22187078.

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Distributed power generation, micro-grids, and networks working in islanding mode have strong deviations in voltage quantities. These deviations can be divided into amplitude and frequency. Amplitude deviations are well-known and studied, as they are common in small and big grids. However, deviations on the ac mains frequency have not been widely studied. The literature shows control schemes capable of bearing these variations, but no systematic analysis has been performed to ensure stability. As the majority of power converters are designed for big grids, their analysis and design neglect frequency disturbances, therefore those devices allow a very small frequency operating window. For instance, in power converters that need to be synchronized to the grid, the standard deviation does not go beyond 0.5 Hz, and for grid-tied inverters it does not go beyond 1 Hz, whereas variations of around 8 Hz can be expected in micro-grids. This work presents a comprehensive analysis of the control system’s stability, where two different control schemes for a back-to-back static converter topology are implemented and studied under a wide variable grid frequency. Because the behavior of power converters is nonlinear and coupled, dynamic and static decouplers are usually introduced in the controller, being a key element on the scheme according to the findings. The results show that using just a static decoupler does not guarantee stability under frequency variations; meanwhile, when a dynamic decoupler is used, the operating window can be greatly extended. The procedure shown in this paper can also be extended to other control algorithms, making it possible to carefully choose the control system for a variable frequency condition. Simulated and experimental results confirm the theoretical approach.

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Atmeh, Mohammad, Alwathiqbellah Ibrahim, and Abdallah Ramini. "Static and Dynamic Analysis of a Bistable Frequency Up-Converter Piezoelectric Energy Harvester." Micromachines 14, no. 2 (January 19, 2023): 261. http://dx.doi.org/10.3390/mi14020261.

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Using energy harvesting to convert ambient vibrations efficiently to electrical energy has become a worthy concept in recent years. Nevertheless, the low frequencies of the ambient vibrations cannot be effectively converted to power using traditional harvesters. Therefore, a frequency up-conversion harvester is presented to convert the low-frequency vibrations to high-frequency vibrations utilizing magnetic coupling. The presented harvester consists of a low-frequency beam (LFB) and a high-frequency beam (HFB) with identical tip magnets facing each other at the same polarity. The HFB, fully covered by a piezoelectric strip, is utilized for voltage generation. The dynamic behavior of the system and the corresponding generated voltage signal has been investigated by modeling the system as a two-degrees-of-freedom (2DOF) lumped-parameter model. A threshold distance of 15 mm that divides the system into a monostable regime with a weak magnetic coupling and a bistable regime with a strong magnetic coupling was revealed in the static analysis of the system. Hardening and softening behaviors were reported at the low frequency range for the mono and bistable regimes, respectively. In addition, a combined nonlinear hardening and softening behavior was captured for low frequencies at the threshold distance. Furthermore, a 100% increment was achieved in the generated voltage at the threshold compared to the monostable regime, and the maximum generated voltage was found to be in the bistable regime. The simulated results were validated experimentally. Moreover, the effect of the external resistance was investigated, and a 2 M resistance was found to be optimal for maximizing the generated power. It was found that frequency up-converting based on magnetic nonlinearity can effectively scavenge energy from low-frequency external vibrations.

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Li, Haoyuan, Guanjun Li, Bo Yang, and Liantao Ji. "Research on variable speed operation of static frequency converter for pumped storage units." E3S Web of Conferences 252 (2021): 02022. http://dx.doi.org/10.1051/e3sconf/202125202022.

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Constant speed pumped storage unit is widely used, however it cannot adjust the input power when working in the electric mode, and cannot work in the best efficiency when the head of the reservoir changes greatly. Therefore, it is necessary to study and develop the variable speed pumped storage systems. This paper has studied on variable speed operation of static frequency converter for pumped storage units. Besides, development status of variable speed pumped storage system at home and abroad is investigated. Furthermore, classification and advantages and disadvantages of variable speed pumped storage system are also introduced, mainly including two typical variable speed pumped storage systems, i.e., doubly-fed variable speed system and full power variable speed system.

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Jung-Chen Chiang, Chi-Jui Wu, and Shih-Shong Yen. "Mitigation of harmonic disturbance at pumped storage power station with static frequency converter." IEEE Transactions on Energy Conversion 12, no. 3 (1997): 232–40. http://dx.doi.org/10.1109/60.629708.

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Alexa, D. "Static Frequency Converter with Double-Branch Inverter for Supplying Three-Phase Asynchronous Motors." EPE Journal 5, no. 1 (March 1995): 31–34. http://dx.doi.org/10.1080/09398368.1995.11463360.

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Diab, Ahmed A. Zaki, Terad Ebraheem, Raseel Aljendy, Hamdy M. Sultan, and Ziad M. Ali. "Optimal Design and Control of MMC STATCOM for Improving Power Quality Indicators." Applied Sciences 10, no. 7 (April 4, 2020): 2490. http://dx.doi.org/10.3390/app10072490.

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In recent years, modular multilevel converters (MMC) are becoming popular in the distribution and transmission of electrical systems. The multilevel converter suffers from circulating current within the converter that increases the conduction loss of switches and increases the thermal stress on the capacitors and switches’ IGBTs. One of the main solutions to control the circulating current is to keep the capacitor voltage balanced in the MMC. In this paper, a new hybrid control algorithm for the cascaded modular multilevel converter is presented. The Harris hawk’s optimization (HHO) and Atom search optimization (ASO) are used to optimally design the controller of the hybrid MMC. The proposed structure of modular multilevel inverters allows effective operation, a low level of harmonic distortion in the absence of output voltage filters, a low switching frequency, and excellent flexibility to achieve the requirements of any voltage level. The effectiveness of the proposed controller and the multilevel converter has been verified through testing with the application of the MMC-static synchronous compensator (STATCOM). The stability of the voltage capacitors was monitored with balanced and unbalanced loads on the studied network.

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Souza, Lucas Carvalho, Douglas Carvalho Morais, Luciano de Souza da Costa e. Silva, Falcondes José Mendes de Seixas, and Luis De Oro Arenas. "DC-DC 3SSC-A-Based Boost Converter: Analysis, Design, and Experimental Validation." Energies 14, no. 20 (October 17, 2021): 6771. http://dx.doi.org/10.3390/en14206771.

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A detailed analysis and validation of the DC-DC boost converter based on the three-state switching cell (3SSC) type-A are presented in this paper. The study of this topology is justified by the small amount of research that employs 3SSC-A and the advantages inherent to 3SSC-based converters, such as the division of current stresses between the semiconductors, the distribution of thermal losses, and the high-density power. Therefore, a complete static analysis of the converter is described, as well as the study of all voltage and current stresses in the semiconductors, the development of a loss model in all components, and a comparison with other step-up structures. Additionally, the small-signal model validation is accomplished by comparing the theoretical frequency response and the simulated AC sweep analysis. Finally, implementing a simple controller structure, the converter is experimentally validated through a 600 W prototype, where its overall efficiency is examined for various load conditions, reaching 96.8% at nominal load.

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Rwamurangwa, Evode, Juan Díaz González, Pedro José Villegas Saiz, Juan Antonio Martín-Ramos, and Alberto Martin Pernía. "A Parallel Resonant Converter Polynomial Model Implemented in a Digital Signal Controller." Electronics 11, no. 7 (March 30, 2022): 1085. http://dx.doi.org/10.3390/electronics11071085.

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Due to their exceptional performance in coping with large variations in output voltage and current, parallel resonant converters (PRC) are commonly used in high-voltage applications. The incorporation of step-up transformer parasitic components as part of a power topology, on the right duty and a suitable switching frequency, determines the high efficiency and wide variety of applications with PRC. Switching losses are reduced in the same topology by tracking and running on the optimum mode for each power and voltage by a set frequency and duty. The PRC’s static model behaviors, under optimum operating circumstances, are illustrated. The equivalent polynomial model is used to quickly compute the switching frequency and duty cycle required to achieve the converter’s desired output voltage and power. The polynomial model is simple and easy to implement in any form of a digital signal controller (DSC). Normalized parameters are used to widen the operational range and generalize the model. This also offers the essential protection against current and voltage spikes. The work in progress depicts the specific procedures involved in developing a polynomial model. The normalized equations provide a graphical description of the static model, from which the graphical representation of the polynomial are derived. Hence, polynomial equations are obtained. This paper describes the PRC static model, how to convert it to a polynomial model, how to validate it with MATLAB-Simulink, how to program F28335 using Simulink, and how to use it in practice.

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Depalo, Francesco, Shan Wang, Sheng Xu, and C. Guedes Soares. "Design and Analysis of a Mooring System for a Wave Energy Converter." Journal of Marine Science and Engineering 9, no. 7 (July 19, 2021): 782. http://dx.doi.org/10.3390/jmse9070782.

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The objective of this work is to develop an efficient method to carry out the preliminary design of the mooring system for a wave energy converter. A practical mooring design procedure is applied to a specific case of study, and it can be replicated for other cases. Firstly, the static analysis is performed for a configuration with three mooring cables with different pre-tensions on fairlead, diameters of the cables, and materials. Based on these configurations from the static analysis, a quasi-static analysis is carried out in the frequency domain and a preliminary design is conducted according to DNV rules. Then, a 3-h dynamic analysis in the time domain is performed on several selected configurations, considering the same environmental conditions in the quasi-static analysis using the finite element method. Extreme dynamic responses of the system, such as extreme surge motion and mooring tensions, are estimated by the global maximum method, which is performed by fitting 20 individual maximum observations by Gumbel distribution. The quasi-static method is validated by comparing the results of extreme tension and displacement with the coupled time domain analysis. In addition, the influence of pre-tensions and cable diameters on the static and dynamic responses of the mooring system are discussed.

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Magsaysay, G., T. Schuette, and R. J. Fostiak. "Use of a static frequency converter for rapid load response in pumped-storage plants." IEEE Transactions on Energy Conversion 10, no. 4 (1995): 694–99. http://dx.doi.org/10.1109/60.475841.

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Liu, Tian-Hua, Chih-Ying Lin, Jin-Shyr Yang, and Wen-Yao Chang. "Modeling and performance of a static frequency converter starting a 300 MVA synchronous machine." Electric Power Systems Research 37, no. 1 (April 1996): 45–53. http://dx.doi.org/10.1016/0378-7796(96)01039-5.

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Szcześniak, Paweł. "A static and dynamic model of a space vector modulated matrix-reactance frequency converter." Electric Power Systems Research 108 (March 2014): 82–92. http://dx.doi.org/10.1016/j.epsr.2013.10.020.

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Long, Hao, Xue Jun Li, Jing Long Huang, and Kuan Fang He. "Research on Double-Closed-Loop Control for the Frequency Converters in Parallel Operation." Advanced Materials Research 722 (July 2013): 503–6. http://dx.doi.org/10.4028/www.scientific.net/amr.722.503.

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In order to achieve the two drive synchronous operation , it's necessary to add an inner current loop on the basis of the outer voltage regulator which improve the system s dynamic response speed in the premise of ensure the stability of the system. The frequency converter parallel technology controlled by voltage and current double closed loop is researched. Design the controllers parameters of the current inner ring and voltage outer ring and these parameters are demonstrated according to the classical control theory. At last we conduct the simulation whose results show that the parallel converter system which controlled by the voltage and current double closed loop has good static and dynamic performance.

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Wei, Cai Qiao, Xiao Guang Wang, and Hui Guo. "Design of Control System for Automatic Glass Duster." Advanced Materials Research 466-467 (February 2012): 719–23. http://dx.doi.org/10.4028/www.scientific.net/amr.466-467.719.

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A control system was designed in order to endble the glass duster to cooperate harmoniously.The system consisted of PLC,touch screen,frequency converter,moter and other components.The rotary speed of motor was adjusted by the frequency converter to keep dusting powder amounts constance. The static electricity technology was used to increase adsorption of the powder . The PID control method was proposed to meet the special control request of the powder box temperature. The test indicated that the dusting amounts was between 0.4-1.6 grams per square metre. About 85% of powder could adsorb on glass,system function and accuracy could meet the needs of the safe storage and transportation completely.

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Tuluhong, Ayiguzhali, Weiqing Wang, Yongdong Li, Haiyun Wang, and Lie Xu. "Research on Modelling and Stability Characteristics of Electric Traffic Energy System Based on ZVS-DAB Converter." Journal of Electrical and Computer Engineering 2020 (May 28, 2020): 1–10. http://dx.doi.org/10.1155/2020/5450628.

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We study and describe mostly used traditional simplified circuits for full-bridge Zero Voltage Switching-Dual Active Bridge (ZVS-DAB) converter and deduce their mathematical model. On this basis, we propose a high-frequency (HF) mathematical model, which takes into account conduction loss and HF characteristics of the ZVS-DAB converter model. We compare the static and dynamic stabilities of the traditional and the proposed HF mathematical model by simulation. Finally, the high-frequency planar transformer (HFPT) with good heat dissipation and the wide band gap (WBG) semiconductor SiC switches with fast switching speed are employed to build a 4.4 kw, 40 KHz experimental prototype to verify the effectiveness of the improved HF circuit of ZVS-DAB converter. The results show that the proposed HF mathematical model is superior to the traditional one, and it fully considers the HF characteristics of the circuit and effectively improves the HF oscillation, DC bias, and waveform distortion of the ZVS-DAB converter.

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Afanasov, Andriy, Oleksandr Shapovalov, and Maryna Voitenko. "Systems mutual loadings of traction asynchronous cars." MATEC Web of Conferences 294 (2019): 05009. http://dx.doi.org/10.1051/matecconf/201929405009.

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The review of methods of post-repair tests of traction asynchronous motors under conditions of locomotive depot is carried out.The necessity of introducing special stands for post-repair tests is shown in order to improve their quality, reduce the number of failures of service equipment, improve safety of the railway transport. Let’s consider a question of power supply of the research asynchronous engine in wide frequency range and also a possibility of creation of the universal stand for testing important asynchronous engines of the electrorolling stock. Survey of possible versions of the scheme mutual loadings of asynchronous electrical machines which can be used for testing traction asynchronous engines of the rolling stock is executed. Such systems can be constructed both with use of the static converter of frequency, and without it. The given short characteristic of each alternative, certain advantages and shortcomings of each of system options. It is shown that systems with use of static converters of frequency differ in high power efficiency, allow to carry out tests in the wide frequency range of power supply, however have higher prime cost. Schemes without converters of frequency differ in smaller power efficiency, impossibility to carry out tests in the wide range of frequency of power supply, high level of consumption of reactive power . The results of the carried-out analysis can be used when choosing rational option of a system mutual loadings of asynchronous electric motors which will differ in higher functionality and power efficiency. Use of such systems will allow to lower capital expenditure for creation new and modernization of traction electrical machines that exist at the station for test.

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Höpner, Vanessa Neves, and Volmir Eugênio Wilhelm. "Insulation Life Span of Low-Voltage Electric Motors—A Survey." Energies 14, no. 6 (March 21, 2021): 1738. http://dx.doi.org/10.3390/en14061738.

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The use of static frequency converters, which have a high switching frequency, generates voltage pulses with a high rate of change over time. In combination with cable and motor impedance, this generates repetitive overvoltage at the motor terminals, influencing the occurrence of partial discharges between conductors, causing degradation of the insulation of electric motors. Understanding the effects resulting from the frequency converter–electric motor interaction is essential for developing and implementing insulation systems with characteristics that support the most diverse applications, have an operating life under economically viable conditions, and promote energy efficiency. With this objective, a search was carried out in three recognized databases. Duplicate articles were eliminated, resulting in 1069 articles, which were systematically categorized and reviewed, resulting in 481 articles discussing the causes of degradation in the insulation of electric motors powered by frequency converters. A bibliographic portfolio was built and evaluated, with 230 articles that present results on the factors that can be used in estimating the life span of electric motor insulation. In this structure, the historical evolution of the collected information, the authors who conducted the most research on the theme, and the relevance of the knowledge presented in the works were considered.

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Haddad, K. Al, Y. Cheron, H. Foch, and V. Rajagopalan. "Static and small signal analysis of a series-resonant converter operating above its resonant frequency." Canadian Electrical Engineering Journal 12, no. 4 (October 1987): 158–64. http://dx.doi.org/10.1109/ceej.1987.6591092.

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V. Girija and Dr. D. Mural. "Simulation and Steady State Analysis of a Non-isolated Diode Rectifier-fed DC-DC Boost Converter with High Static Voltage Gain." International Journal for Modern Trends in Science and Technology 7, no. 03 (April 10, 2021): 20–25. http://dx.doi.org/10.46501/ijmtst0703004.

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This paper presents the simulation and analysis of a non-isolated step-up DC-DC converter operating in continuous inductor current mode with fixed switching frequency. The proposed converter proves better steady state performance in terms of improved voltage gain compared to the conventional boost configuration. The suggested two stage converter topology is fed by an uncontrolled diode bridge rectifier for which the sinusoidal input AC voltage is (50/ 2 ) V (rms). The design of the converter is such that the input AC voltage of (50/ 2 ) V (rms) is stepped up to around 256 V (DC) at the load end for the duty ratio value of 0.8. The performance of the proposed converter configuration is validated through simulation in Matlab/Simulink platform. The open-loop configuration provides higher constant output voltage profile compared to the conventional boost topology. The output voltage and current profiles show reduced settling time with almost no overshoot. The output voltage ripple is reduced to lower value. The suggested configuration ensures that the voltage-current stress across the switches is also reduced.

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Furukawa, Yudai, Yuichiro Shibata, Haruhi Eto, Ilhami Colak, and Fujio Kurokawa. "Static Analysis of a Digital Peak Current Mode Control DC–DC Converter Using Current–Frequency Conversion." IEEE Transactions on Power Electronics 37, no. 7 (July 2022): 7688–704. http://dx.doi.org/10.1109/tpel.2022.3145811.

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Wakui, Shin'ichi, Kazumasa Ide, Kazuhiko Takahashi, Miyoshi Takahashi, and Yasuomi Yagi. "3D Magnetic Field Analysis of Turbine Generator Rotor Eddy Currents for a Static Frequency Converter Starting." IEEJ Transactions on Industry Applications 118, no. 9 (1998): 1063–70. http://dx.doi.org/10.1541/ieejias.118.1063.

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XIA, FAN, YIQIANG ZHAO, and GONGYUAN ZHAO. "A 12-bit 200-MHz CURRENT-STEERING DAC WITH CALIBRATION." Journal of Circuits, Systems and Computers 23, no. 04 (April 2014): 1450053. http://dx.doi.org/10.1142/s0218126614500534.

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In this paper, a 12-bit current-steering digital-to-analog converter (DAC) with high static and dynamic linearity is proposed. Compared to traditional intrinsic-accuracy DACs, the static linearity is obtained by a series of subsidiary DACs which can shorten the calibration cycle with smaller additional circuits. The presented DAC is based on the segmented architecture and layout has been carefully designed so that better synchronization among the current sources can be achieved. The DAC is implemented in a standard 0.18-μm CMOS technology and the current source block occupies less than 0.5 mm2. The measured differential nonlinearity (DNL) and integral nonlinearity (INL) performance is ± 0.3 LSB and ± 0.5 LSB, respectively, and the spurious free dynamic range (SFDR) is 75 dB at 1 MHz signal frequency and 200 MHz sampling frequency.

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Ge, Guang Jun, Yu Dong Li, and Wei Zhang. "Electric Locomotive Variable Frequency Drive Device of Mine DC Lines." Applied Mechanics and Materials 143-144 (December 2011): 87–91. http://dx.doi.org/10.4028/www.scientific.net/amm.143-144.87.

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This document presents a solution for controlling a permanent magnet synchronous motor(PMSM) for the coal mine of DC lines of electric locomotive using the Texas Instruments (TI) TMS320C2407A digital signal processor (DSP). The control method presented relies on the vector control technology and space vector pulse width modulation (SVPWM) technology, the control algorithm maintains efficiency in a wide range speed. This document describes the structure features of the converter, power electronics, the keyboard display and the auxiliary power supply, hardware implementation and software design. Experimental results show that the system has better static and dynamic performance, completely fits the DC lines of electric locomotive operation. This document describes a practical solution and corresponding result, and this research has been applied successfully in practical work.

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Li, Li, Hao Zuo, Siyuan Guo, Jin Wang, and Jiawei Zhao. "Simulation of Sensorless Control for the Start-up of Large-Scale Synchronous Condenser Using Static Frequency Converter." IOP Conference Series: Earth and Environmental Science 223 (January 21, 2019): 012033. http://dx.doi.org/10.1088/1755-1315/223/1/012033.

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Wang, Puyu, Qingwen Mou, Xing Liu, Wei Gu, and Xuan Chen. "Start-Up Control of a Synchronous Condenser Integrated HVDC System With Power Electronics Based Static Frequency Converter." IEEE Access 7 (2019): 146914–21. http://dx.doi.org/10.1109/access.2019.2946394.

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Mahdipour, Mahdi, and Seyed Mohamad Taghi Bathaee. "A novel static frequency converter for start-up and shutdown processes of gas turbine power plant units." International Transactions on Electrical Energy Systems 25, no. 12 (January 26, 2015): 3586–99. http://dx.doi.org/10.1002/etep.2054.

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Avdeyev, Boris Aleksandrovich, Daria Dmitrievna Davydova, and Svetlana Vladimirovna Podunai. "Improving control system of output voltage in “shaft generator - frequency converter” complex." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2022, no. 4 (November 30, 2022): 73–81. http://dx.doi.org/10.24143/2073-1574-2022-4-73-81.

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The article focuses on operation of the ship shaft generator on the joint buses of the main switchboard through a frequency converter that consists of an uncontrolled rectifier and a self-excited inverter with pulse width modulation. The most common schemes of using shaft generators on ships are given, their advantages and disad-vantages are analyzed. There has been illustrated a flowchart and given a detailed description of the operation of a ship electric power plant with power take-off from the main engine. A control system regulating the constant flow interlinkage in the “frequency converter - shaft generator” complex, which ensures stable output voltage, has been developed. It has been stated that a random change in the rotational speed or in a torque fluctuation of the shaft generator rotor have little impact on the quality of generated electricity. Simulation modeling of the complex is given in the MATLAB/Simulink software package. The developed controller of a self-excited inverter supports continuous flow interlinkage by vector control. There has been demonstrated the composition and operation principle of the control system of output voltage of a shaft generator by using vector regulation method. Modeling has proved the availability of the self-excited inverter control system. The oscillograms of modeling the input and output current and voltage values have been obtained. The modeling results justified that changing the input voltage and frequency of the generator provided the high quality output voltage indicators. Harmonic distortion coefficients and static deviations have been analyzed. The expediency of using combined filters of higher harmonics to eliminate interharmonics and higher harmonics in the ship network has been proved. Practical recommendations are given to improve the quality of operation of the ship electrical complex with a shaft generator.

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Ninic, Marko, and Radivoje Djuric. "A novel high efficiency CMOS RF/DC power harvester based on constant on/off time buck controller for 60GHz frequency band." Serbian Journal of Electrical Engineering 14, no. 1 (2017): 133–48. http://dx.doi.org/10.2298/sjee1701133n.

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A novel 60 GHz RF/DC power harvesting system is presented. The system consists of RF to DC rectifier and a DC/DC Buck converter based on constant ON/OFF time (COOT) control. The rectifier has a structure of voltage doubler, but employs diodes that have lower parasitics compared to those of the standard MOSFET diodes, resulting in improved power conversion efficiency. The peak efficiency of the rectifier obtained with the extracted parasitics for the output power of 1 mW is about 25%. In order to keep the output voltage of the system to 1.2 V, the COOT control in the Buck converter is used. COOT control has much better efficiency at low output powers compared to the PWM systems. For correct operation of the COOT control, auxiliary sub-blocks: a low power high-speed comparator, a hysteresis comparator, and a high-speed voltage reference are designed and presented. The maximum switching frequency in the Buck converter is about 100MHz and the whole control system has very low static power consumption. The efficiency of the overall system for the output power of 1mW is about 21%. The system is designed in 65 nm CMOS technology.

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Hasan, Nazmul, and Tarak Saha. "single-phase bidirectional AC-AC converter with H-bridge energy buffer for wireless power transfer applications." International Journal of Power Electronics and Drive Systems (IJPEDS) 13, no. 1 (March 1, 2022): 191. http://dx.doi.org/10.11591/ijpeds.v13.i1.pp191-199.

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This paper introduces a single-phase bidirectional AC-AC Matrix type converter for wireless power transfer (WPT) applications. The proposed converter converts mains 50 Hz alternating current (AC) directly to high frequency 85 kHz AC without an intermediate direct current (DC) conversion stage. A minimum cost realization of only two bidirectional AC switches comprised each of two semiconductor device and one gate drive signal is employed. The converter operation modes are quantum energy injection and circulating self-oscillation. Elimination of the DC link introduces a sag in the power transfer during the zero crossing of input AC mains, which is well documented in literature. A novel H-bridge buffer structure is introduced which eliminates the power sag by storing energy during mains peak and delivering energy during the zero-crossing period. The converter operates with inherent zero current switching, thus achieving a low switching loss and electro-magnetic interference. The control feature ensures that the converter can be used for both static and dynamic wireless charging applications. The bidirectional power transfer capability ensures that the system can operate in both grid to vehicle (G2V) and vehicle to grid (V2G) power transfer modes. The proposed converter design is analyzed analytically and verified through thorough simulation study.

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Memon, Ahsanullah, Mohd Wazir Mustafa, Muhammad Naveed Aman, Mukhtar Ullah, Tariq Kamal, and Abdul Hafeez. "Dynamic Low Voltage Ride through Detection and Mitigation in Brushless Doubly Fed Induction Generators." Energies 14, no. 15 (July 23, 2021): 4461. http://dx.doi.org/10.3390/en14154461.

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Brushless doubly-fed induction generators have higher reliability, making them an attractive choice for not only offshore applications but also for remote locations. These machines are composed of two back-to-back voltage source converters: the grid side converter and the rotor side converter. The rotor side converter is typically used for reactive current control of the power winding using the control winding current. A low voltage ride through (LVRT) fault is detected using a hysterisis comparison of the power winding voltage. This approach leads to two problems, firstly, the use of only voltage to detect faults results in erroneous or slow response, and secondly, sub-optimal control of voltage drop because of static reference values for reactive current compensation. This paper solves these problems by using an analytical model of the voltage drop caused by a short circuit. Moreover, using a fuzzy logic controller, the proposed technique employs the voltage frequency in addition to the power winding voltage magnitude to detect LVRT conditions. The analytical model helps in reducing the power winding voltage drop while the fuzzy logic controller leads to better and faster detection of faults, leading to an overall faster response of the system. Simulations in Matlab/Simulink show that the proposed technique can reduce the voltage drop by up to 0.12 p.u. and result in significantly lower transients in the power winding voltage as compared to existing techniques.

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Alexa, D. "Static frequency converter with current source inverter and low content of higher harmonics at the input and output." Archiv für Elektrotechnik 73, no. 2 (March 1990): 140. http://dx.doi.org/10.1007/bf01573457.

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Alexa, D. "Static frequency converter with current source inverter and low content of higher harmonics at the input and output." Archiv für Elektrotechnik 73, no. 1 (January 1990): 51–57. http://dx.doi.org/10.1007/bf01573464.

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Damatopoulou, Tatiana, Vasilios Lazaris, Antonios Kladas, and Athanasios G. Mamalis. "Electromagnetic Compatibility Issues in Electric Vehicle Applications." Materials Science Forum 915 (March 2018): 71–76. http://dx.doi.org/10.4028/www.scientific.net/msf.915.71.

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The paper develops analyses electromagnetic compatibility issues in electric vehicles. Particular techniques are developed involving special elements of tubular geometry based on the analytical solution of diffusion equation combined with standard finite elements, for analysis of electromagnetic shielding effectiveness in power cables due to power static converter operation. Particular simulations analyze the exposure levels due to variable frequency magnetic field on anatomically detailed human models in electric vehicle cabin environment. The results obtained have been compared to those found in the literature and to measured ones.

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Zhu, Hong, Xing Zhang, Ming Li, and Xiaoxi Liu. "Research on Multifunctional High-Power Grid Source Simulator System with Synchronous Generator, Line Impedance Imitation, and ZIP Load Emulator." Energies 12, no. 24 (December 7, 2019): 4657. http://dx.doi.org/10.3390/en12244657.

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As the penetration of distributed power sources in the power grid is getting higher and higher, the adverse effects are also increasing. It is necessary to adopt control technology to make the distributed power source participate in the power regulation of the power system. In this paper, a multifunctional high-power grid source simulator system is presented. For wider control bandwidth and better performance, a high-power, back-to-back converter and an auxiliary lower-power, back-to-back converter connected in cascade mode topology is proposed in this paper. The basic principle and implementation method of virtual synchronous generator (VSG) in the high-power, back-to-back converter are described to reflect the same power frequency characteristics and voltage regulation characteristics as synchronous generators. Amplitude closed-loop control is proposed to realize zero steady-state error in the lower-power, back-to-back converter, also with line impedance imitation. Meanwhile, a constant-impedance, constant-current, and constant-power (ZIP) load model is used to emulate static load in the grid simulator system. At last, a set of experimental results for a 2 MW grid simulator system is provided to verify the effectiveness and validity of the proposed approach.

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Afanasyev, Alexander A., Valeriy S. Genin, Vladimir A. Vatkin, and Nadezhda N. Ivanova. "MODEL OF AN ADJUSTABLE ELECTROMAGNETIC GEARBOX WITH A THREE-PHASE STATOR WINDING IN THE STATE SPACE." Vestnik Chuvashskogo universiteta, no. 1 (March 25, 2021): 5–18. http://dx.doi.org/10.47026/1810-1909-2021-1-5-18.

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A magnetic gearbox with a three-phase stator winding, powered by a static frequency converter with a sinusoidal current, which is in phase or in antiphase with the EMF of the idling winding, will have in this mode the maximum values of the electromagnetic moments of the shafts proportional to the stator current. Such a gearbox will have no “overturning” of the rotors as long as the frequency converter is able to increase its current with increasing load. The electromagnetic moments of the rotors of the magnetic gear are a consequence of the presence of the electromagnetic moment of the stator. The electromagnetic moments of the rotors are rigidly related to the electromagnetic moment of the stator through constant coefficients. A mathematical model of an adjustable magnetic gearbox with a three-phase stator winding and the results of modeling a dynamic system are presented. Offers the structure of the output shaft speed stabilization system, such as a wind turbine. The introduction of the main research results is illustrated.

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Journal articles on the topic 'Static frequency converter'

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