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Xiao, Lingfei, Robert R. Sattarov, Peisong Liu i Cong Lin. "Intelligent Fault-Tolerant Control for AC/DC Hybrid Power System of More Electric Aircraft". Aerospace 9, nr 1 (22.12.2021): 4. http://dx.doi.org/10.3390/aerospace9010004.
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This paper presents a novel intelligent fault-tolerant control method for a kind of more electric aircraft AC/DC hybrid electrical power system, in order to ensure the safe operation of the engine and improve the power supply quality. The more electric aircraft electrical power system was combined with an aircraft engine, two generators, two AC/DC rectifiers, two DC/AC inverters, DC loads, and AC loads. A multi-objective optimization intelligent sliding mode fault-tolerant controller was obtained for aircraft engine with actuator faults. Each of AC/DC rectifiers is 12-pulse autotransformer rectifier unit with active power filter. Active power filter was used to realize the desired performance of DC bus. Intelligent fractional order PI controller is presented for AC/DC rectifier by considering multiple performance indexes. In order to guarantee the AC-side has satisfying voltage, current, and frequency, no matter the sudden change of AC load that happens or DC/AC fault that occurs, the virtual synchronous generator control method was used for DC/AC inverters. Simulation results verify the effective of the proposed more electric aircraft AC/DC hybrid electrical power system.
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Yodwong, Burin, Damien Guilbert, Matheepot Phattanasak, Wattana Kaewmanee, Melika Hinaje i Gianpaolo Vitale. "AC-DC Converters for Electrolyzer Applications: State of the Art and Future Challenges". Electronics 9, nr 6 (29.05.2020): 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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Gibbs, I., i D. Kimmel. "Active Current Balance between Parallel Thyristors in Multibridge AC-DC Rectifiers". IEEE Power Engineering Review 21, nr 11 (listopad 2001): 53–54. http://dx.doi.org/10.1109/mper.2001.4311136.
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Barbosa, P. G., J. A. Santisteban i E. H. Watanabe. "Shunt-series active power filter for rectifiers AC and DC sides". IEE Proceedings - Electric Power Applications 145, nr 6 (1998): 577. http://dx.doi.org/10.1049/ip-epa:19981932.
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Sal y Rosas, Damian, Daniel Chavez, David Frey i Jean-Paul Ferrieux. "Single-Stage Isolated and Bidirectional Three-Phase Series-Resonant AC–DC Converter: Modulation for Active and Reactive Power Control". Energies 15, nr 21 (30.10.2022): 8070. http://dx.doi.org/10.3390/en15218070.
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Single-stage isolated and bidirectional (SSIB) AC–DC converters have a high potential for future solid-state transformers and smart battery chargers due to their reduced volume and high efficiency. However, there is a research gap for SSIB reactive power injection. This article introduces an SSIB three-phase AC–DC converter composed of three low frequency rectifiers linked by tiny film capacitors with a quad-active-bridge series-resonant (QABSR) DC–DC. A novel QAB modulation is proposed to solve three issues: (1) Three DC inputs with high ripple compensation, (2) active–reactive power injection, and (3) minimization of high-frequency (HF) transformers currents. The rectified grid voltages were modulated by time-variant duty ratio (DR) angles. In contrast, the DC source was modulated by a fixed DR (FDR) angle along with a phase-shift angle which changes according to the grid current amplitude. A constant HF current amplitude with minimum value was obtained. It is shown that the HF current amplitude is increased for reactive power injection. Hence, the FDR angle was used to compensate for this increase. Active and reactive power control were validated in a 2 kW prototype. Compared with other structures, tiny DC-link capacitors and smaller L filters were used. Moreover, higher efficiency (96%) and smaller grid currents THDi (3%) were obtained.
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Bi, Kai, Yamei Xu, Pin Zeng, Wei Chen i Xinmin Li. "Virtual Flux Voltage-Oriented Vector Control Method of Wide Frequency Active Rectifiers Based on Dual Low-Pass Filter". World Electric Vehicle Journal 13, nr 2 (7.02.2022): 35. http://dx.doi.org/10.3390/wevj13020035.
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This article presents a non-AC-side voltage sensor control method applied to More Electric Aircraft rectifiers. The control strategy can operate properly over a wide range of frequencies. This strategy calculates the AC supply frequency through an instantaneous phase-locked loop and feeds it back to a dual low-pass filter. The reconstructed rectifier-side voltage is filtered using two low-pass filters with different scale factors. Then, the values of the two filter outputs are subtracted and the effect of the DC bias due to the initial value of the integration is eliminated. The subtracted value is amplitude-phase compensated to calculate the virtual flux value. The phase angle can then be calculated from the virtual flux value. This phase angle is used for the implementation of the voltage-oriented vector control and as an input to the instantaneous phase-locked loop. Simulation and experimental results show that the use of dual low-pass filters under different frequency conditions improves the speed and accuracy of virtual flux estimation and eliminates DC-side bias errors.
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Zeghoudi, A., H. Slimani, A. Bendaoud, B. Benazza, S. Bechekir i H. Miloudi. "Measurement and analysis of common and differential modes conducted emissions generated by an AC/DC converter". Electrical Engineering & Electromechanics, nr 4 (8.07.2022): 63–67. http://dx.doi.org/10.20998/2074-272x.2022.4.09.
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Introduction. Rectifiers are the most important converters in a very wide field: the transport of electrical energy in direct current and in the applications of direct current motors. In most electrical and electronic systems, rectifiers are non-linear loads made up of diodes, therefore they are a source of harmonic pollution at a base frequency with a distorting line current signal that generates electromagnetic interference. There are two disturbance modes: common mode and differential mode. These disturbances caused by the rapid variation of current and voltage as a function of time due to the switching of active components, passive components such as inductors, capacitors, coupling, etc. The purpose of this work is to study the conducted emissions generated by a rectifier connected to the Line Impedance Stabilizing Network in an electric circuit. The determination of these disturbances is done for firstly both common and differential modes at high frequency, and secondly harmonics current, line current at low frequency. The novelty of the proposed work consists in presenting a study of disturbance generated by rectifiers using simulation and also experimental measurements at low and high frequencies in order to compare the results. Methods. For the study of the disturbances conducted by the diode bridge converter (rectifier), the sources of conducted electromagnetic disturbances were presented in the first time. Then, the common and differential modes were defined. This converter was studied by LTspice Software for simulation and also experimental measurements at low frequency for harmonics current and high frequencies for disturbances in common and differential modes. Results. All the simulations were performed using the LTspice software and the results obtained are validated by experimental measurements performed in the APELEC laboratory at the University of Sidi Bel-Abbes in Algeria. The obtained results of conducted emissions at high frequency and total harmonics distortion of current at low frequency are compared between simulation and experiment.
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Gibbs, I. A., i D. S. Kimmel. "Active current balance between parallel thyristors in multi-bridge AC-DC rectifiers". IEEE Transactions on Energy Conversion 16, nr 4 (2001): 334–39. http://dx.doi.org/10.1109/60.969472.
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Ganiev, Rishat N. "INCREASING THE ENERGY PARAMETERS OF THE MAINS SUPPLY BY ACTIVE RECTIFIERS IN THE COMPOSITION OF FREQUENCY CONVERTERS". Vestnik Chuvashskogo universiteta, nr 1 (30.03.2022): 44–52. http://dx.doi.org/10.47026/1810-1909-2022-1-44-52.
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The total power consumed by electrical loads from the electric mains consists of their two components – active and reactive. Most electric drives of modern industrial enterprises operate with a reactive power index of 0.7–0.8. This leads to increased consumption of full power, which increases the load on the mains supply. Modern electric drives are built according to the principle: power supply – rectifier – DC link-inverter – asynchronous motor. Full power consumption occurs at the junction of the “power supply-rectifier”, where the required active power factor of the converter device can be formed. The higher the active power factor, the lower the reactive component in the total energy consumed. Thus, the article proposes a solution to the problem of creating highly efficient converter devices for powering electric motors with the formation of the necessary power factor, since frequency-controlled electric drives of modern mechanisms in industrial enterprises are the main consumers of electricity, which have a significant impact on the state of the supply network. The article considers the possibility of increasing the power factor of the mains input of electric drives with two-link frequency converters based on active (controlled) rectifiers with current inverters and voltage inverters. New methods of control of active rectifiers based on the use of AC rectifiers on fully controlled thyristors GTO, GCT, as well as IGBT transistors with pulse width adjustment are proposed. The variants of the construction of these rectifiers and the results of modeling the proposed control methods are presented, confirming a decrease in the passive components of the mains current, and as a consequence, an increase in the power factor of the network input. The simulation results are performed in the MATLAB 10 program, and are the basis for confirming the method of increasing the active power factor at the network input of a controlled frequency converter with a two-link structure.
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Trivedi, T. A., R. Jadeja i P. Bhatt. "A Review on Direct Power Control for Applications to Grid Connected PWM Converters". Engineering, Technology & Applied Science Research 5, nr 4 (17.08.2015): 841–49. http://dx.doi.org/10.48084/etasr.544.
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The Direct Power Control strategy has become popular as an alternative to the conventional vector oriented control strategy for grid connected PWM converters. In this paper, Direct Power Control as applied to various applications of grid connected converters is reviewed. The Direct Power Control for PWM rectifiers, Grid Connected DC/AC inverters applications such as renewable energy sources interface, Active Power Filters, Doubly Fed Induction Generators and AC-DC-AC converters are discussed. Control strategies such as Look-Up table based control, predictive control, Virtual Flux DPC, Model based DPC and DPC-Space Vector Modulation are critically reviewed. The effects of various key parameters such as selection of switching vector, sampling time, hysteresis band and grid interfacing on performance of direct power controlled converters are presented.
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Xie, Lijun, Fan Cheng i Jing Wu. "Control Strategy for Offshore Wind Farms with DC Collection System Based on Series-Connected Diode Rectifier". Sustainability 14, nr 13 (28.06.2022): 7860. http://dx.doi.org/10.3390/su14137860.
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The DR-HVDC (Diode rectifier-based HVDC) transmission topology was recently proposed for integration on large offshore wind farms due to its low investment cost and high reliability. To further reduce the investment, a DC collection topology based on the series-connected diode rectifiers (DR) is proposed, where no offshore platform is needed. However, units of series-connected topology (SCU) show coupling issues, such as overvoltage, energy curtailment, and fault isolation. First, the coupling mechanism is analyzed, and a suitable operation mode for SCUs is selected to ensure the safe operation of the DC system. Then, the linear relationship of active power and output DC current and DC voltage of SCUs is analyzed, and a novel coordinate control strategy for DC wind farms is proposed, where an onshore converter adapts a DC current controller and wind turbines adapt a mediate output voltage control strategy. The mediate output voltage control strategy includes a triple loop with power loop, mediate output voltage loop, and current loop. Also, the DC open line fault, DC grounding fault, and AC grounding fault of the onshore grid are investigated, and a protection strategy is proposed. A 160 MW wind farm with a DR-SCU DC collection system is built in PSCAD/EMTDC to verify the validity of the proposed control strategy under unequal wind speeds, DC fault, and onshore AC fault, and the results validate the performance of the proposed strategy.
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Ali, Shawkat, Saleem Khan i Amine Bermak. "All-Printed Human Activity Monitoring and Energy Harvesting Device for Internet of Thing Applications". Sensors 19, nr 5 (8.03.2019): 1197. http://dx.doi.org/10.3390/s19051197.
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A self-powered device for human activity monitoring and energy harvesting for Internet of Things (IoT) devices is proposed. The self-powered device utilizes flexible Nano-generators (NGs), flexible diodes and off-the-shelf capacitors. During footsteps the NGs generate an AC voltage then it is converted into DC using rectifiers and the DC power is stored in a capacitor for powering the IoT devices. Polydimethylsiloxane (PDMS) and zinc stannate (ZnSnO3) composite is utilized for the NG active layer, indium tin oxide (ITO) and aluminum (Al) are used as the bottom and top electrodes, respectively. Four diodes are fabricated on the bottom electrode of the NG and connected in bridge rectifier configuration. A generated voltage of 18 Vpeak was achieved with a human footstep. The self-powered smart device also showed excellent robustness and stable energy scavenger from human footsteps. As an application we demonstrate human activity detection and energy harvesting for IoT devices.
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Chowdhury, M. M. R., L. Strayóczky i Z. Süto. "Real-time Simulation Framework for Validating Controllers of Virtual Synchronous Generators". Renewable Energy and Power Quality Journal 21, nr 1 (lipiec 2023): 286–91. http://dx.doi.org/10.24084/repqj21.299.
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The utilization of active rectifiers as converters in the interface between AC and DC microgrids has become a prevalent practice owing to their capacity to facilitate bidirectional power flow. The contemporary methodology for the development of power converters includes the integration of real-time simulation steps for the validation of control schemes and the assurance of safe implementation with hardware. The present study proposes a methodology for developing a real-time Hardware-in-theLoop (HIL) simulation framework, which aims to facilitate the rapid prototyping of advanced control algorithms for an ActiveFront-End (AFE) rectifier, especially a Virtual Synchronous Generator (VSG) control strategy. This approach aims to enhance the dynamic performance and stability of low-inertia power systems by mimicking the behavior of a synchronous generator, thereby providing virtual inertia to the power system. The control schemes and the primary circuit models are designed and implemented utilizing Matlab/Simulink and are optimized for code generation.
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Kumar, Amit, i Gopalakrishna Srungavarapu. "A power quality enhanced grid voltage sensorless predictive direct power control for active front end rectifiers". Transactions of the Institute of Measurement and Control 40, nr 13 (9.11.2017): 3809–23. http://dx.doi.org/10.1177/0142331217732617.
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In this research work, a power quality enhanced grid voltage sensorless deadbeat predictive direct power control (DB-DPC) approach for AC/DC power converters based on latest virtual flux (VF) estimation, DB-DPC and space vector pulse width modulation (SVPWM) is proposed. At first, the grid voltage sensorless technique with switching table based DPC, which is a conventional approach, is discussed and its performance is analyzed under both increase of load as well as decrease of load conditions. Further, the proposed technique performance is also analyzed under the same circumstance and its performance is compared with the traditional method. The proposed technique has numerous advantages over the conventional method such as constant switching frequency, better active and reactive power control, good regulation of dc bus voltage, and enhanced power quality performance. As the proposed approach utilizes VF, DB-PC, and SVPWM techniques, this ensure line voltage sensorless approach, excellent control dynamics and constant switching frequency, respectively. At the end, experimental validation is done to confirm the supremacy of the proposed technique under load varying conditions and has a phenomenal performance under these circumstances.
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Khitrov, Alexander, Andrei Khitrov, Sergey Loginov, Yuliya Domracheva i Evgeniy Veselkov. "POWER UNIT FOR POWER SUPPLY OF AN AUTONOMOUS FACILITY HAVING ABILITY TO CONNECT TO GENERAL INDUSTRIAL POWER SUPPLY IN RECUPERATIVE MICROGENERATION MODE". ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 3 (16.06.2021): 142–47. http://dx.doi.org/10.17770/etr2021vol3.6517.
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Fundamental and exploratory research in the field of energetics and rational nature management is currently focused on getting results in the field of the effective development and functioning of energy systems. Such systems are based on modern electrical equipment, including electrical machines and controlled power converters (active rectifiers and regenerative units (AC/DC), direct voltage converters (DC/DC), inverters (DC/AC)), conventional and non-traditional electric power based on renewable energy sources (RES).The Program of basic research in the Russian Federation on a long-term period (2021-2030 years) comprises the actual problems of development of energy supply, energy efficiency, renewable and alternative sources in industry and agriculture, including the issues of production technology, of conversion and storage of electric power.Electric power from the renewable energy sources requires its continuous correction, equalization and buffering i.e. a control system for the system operating modes.The paper presents a project of the power unit that provides both autonomous and traditional operation of a power plant having the possibility of recuperating electrical energy into the network. The structure and the composition of such a power unit is proposed, basic control strategies for an autonomous power generating plant having a capacity of up to 15 kW, operating from the variable low speed engine, also having the other sources of alternative energy with the possibility of power accumulation are considered.
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Maklakov, Alexander, Aleksandr Nikolaev, Tatiana Lisovskaya i Sergey Linkov. "REACTIVE POWER COMPENSATION USING A HIGH-POWER REGENERATIVE AC DRIVE". Electrical and data processing facilities and systems 18, nr 3-4 (2022): 65–74. http://dx.doi.org/10.17122/1999-5458-2022-18-3-4-65-74.
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Relevance At present, there is no complete understanding of the possibilities of reactive power compensation by means of high-power regenerative AC drives (RACD) with active frondend rectifiers (AFE), given the limitations and associated problems with electromagnetic compatibility. Aim of research The article is devoted to the issues of reactive power compensation and improvement of the voltage quality in the grid by high-power RACD with AFE. Research methods Methods of theoretical and experimental researches are applied in the work. Results It was noted that the smooth component of the first harmonic of the AFE output voltage is limited by the voltage in the DC link and the maximum allowable AFE current, and this affects the range of transmitted reactive power in the system «RACD with AFE – grid». Thus, there are restrictions for the generation of reactive power in the system «RACD with AFE – grid», which requires their special calculation in the synthesis of the control system. Power quality improving by powerful RACD with AFE is possible only with the correct choice of the grid connection, the switching frequency of semiconductor modules, resonance analysis, AFE control system parameters and thermal control of the power modules. The experimental curves of current consumption from the grid presented in the paper with two different PWM algorithms for the AFE demonstrates a decreasing of current total harmonic distortion. Keywords: active front-end rectifier, pre-programmed PWM, selective harmonic elimination, electromagnetic compatibility, power quality Acknowledgments: The work was supported by the Grant of the President of the Russian Federation for young scientists — candidates of sciences MK-3803.2022.4.
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Feng, Gaohui, Pengsheng Bu i Liqiang Yuan. "Energy Balance Control for Improving Transient Performance of DC Bus Voltage in Power Electronic Transformer for the Voltage-Sensitive Loads". Energies 15, nr 9 (25.04.2022): 3129. http://dx.doi.org/10.3390/en15093129.
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The power electronic transformer (PET), as a main topology for the energy router in the energy internet, consists of the rectifiers, the dual active bridge (DAB), and the inverter, and these three parts are connected by two dc buses. So, the performance of the dc bus voltages is very important because it can totally affect the output waveforms of the dc and ac voltage, especially for the voltage-sensitive loads. Compared with the proportion integration (PI) control scheme, the energy control method utilizes the energy as the control variable, and the control strategy derived from the energy relationship, including the passive elements and all the interfaces, is more direct and explicit. In this paper, considering the energy between the dc bus capacitors and the input inductor and the load and the source in the PET topology, the energy balance control (EBC) strategy is proposed. For the two dc bus voltages, the energy balance relationship of the different time scales is used to decouple the interaction in the control scheme. The EBC strategy can obviously reduce the fluctuation and the transient time of the two dc bus voltages when the load power or voltage reference is changed. Thus, under the limited voltage fluctuation, the EBC strategy can reduce the dc bus capacitance in order to reduce the volume and weight of the converter and enhance the reliability. The simulation and experimental results verify the effectiveness of the proposed control strategy.
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Feng, Gaohui, Pengsheng Bu i Liqiang Yuan. "Energy Balance Control for Improving Transient Performance of DC Bus Voltage in Power Electronic Transformer for the Voltage-Sensitive Loads". Energies 15, nr 9 (25.04.2022): 3129. http://dx.doi.org/10.3390/en15093129.
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The power electronic transformer (PET), as a main topology for the energy router in the energy internet, consists of the rectifiers, the dual active bridge (DAB), and the inverter, and these three parts are connected by two dc buses. So, the performance of the dc bus voltages is very important because it can totally affect the output waveforms of the dc and ac voltage, especially for the voltage-sensitive loads. Compared with the proportion integration (PI) control scheme, the energy control method utilizes the energy as the control variable, and the control strategy derived from the energy relationship, including the passive elements and all the interfaces, is more direct and explicit. In this paper, considering the energy between the dc bus capacitors and the input inductor and the load and the source in the PET topology, the energy balance control (EBC) strategy is proposed. For the two dc bus voltages, the energy balance relationship of the different time scales is used to decouple the interaction in the control scheme. The EBC strategy can obviously reduce the fluctuation and the transient time of the two dc bus voltages when the load power or voltage reference is changed. Thus, under the limited voltage fluctuation, the EBC strategy can reduce the dc bus capacitance in order to reduce the volume and weight of the converter and enhance the reliability. The simulation and experimental results verify the effectiveness of the proposed control strategy.
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Oni, Oluwafemi E., Andrew G. Swanson i Rudiren Pillay Carpanen. "Line Commutated Converter Response during Total and Partial De-Blocking of a Bipolar MTDC System". International Journal of Engineering Research in Africa 52 (styczeń 2021): 49–61. http://dx.doi.org/10.4028/www.scientific.net/jera.52.49.
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This paper focuses on the fault blocking analysis and operational issues associated with MTDC systems incorporated in an AC network. The dynamic modelling of a line-commutated converter based bipolar multi-terminal direct current (LCC MTDC) system are shown, and the dynamic response of the converter during a DC converter fault is discussed. The converter controller design for both rectifiers and the inverters system was modelled for a realistic active power and extinction angle (γ) control with consideration to the VI characteristics of all the converter stations. An overall power controller was modelled for both converter pole. Two operational scenarios of converter fault were simulated using PSCAD EMTDC. The converter firing angle and extinction angle, as well as the voltage-dependent current order limiter, was monitored and plotted on a graph. Results show that the MTDC link became unstable during the full deblocking stage with a continuous occurrence of commutation failure. Furthermore, the results presented in this paper show that during partial converter de-blocking showed a favourable performance, as the power system remains stable and commutation failure of the MTDC system is prevented.
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Kumar, Mahendar, M. A. Uqaili, Z. A. Memon i Bhagwan Das. "Experimental Harmonics Analysis of UPS (Uninterrupted Power Supply) System and Mitigation Using Single-Phase Half-Bridge HAPF (Hybrid Active Power Filter) Based on Novel Fuzzy Logic Current Controller (FLCC) for Reference Current Extraction (RCE)". Advances in Fuzzy Systems 2022 (30.05.2022): 1–18. http://dx.doi.org/10.1155/2022/5466268.
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UPS Uninterruptible power supply) is used as backup when the input source, usually the national grid, fails to give power to a load. In addition to the growing use of electronic power devices in industrial and residential systems, such as UPS, controlled rectifiers, SMPS (Switch Mode Power Supplies), and DC Converters, there is a serious problem caused by harmonics in AC mains, which lowers the power quality. Harmonics can cause a variety of problems, including sensitive equipment failure, resonance issues, heated wires, power loss, and inefficient distribution systems. A passive or active power filter could be used to reduce harmonics. However, passive filters are more difficult to design and are bulkier. With the advancement of power electronics, active power filters were developed, and the best combination of both was supplied in the form of hybrid active power filters (HAPF). This study shows an approach to minimizing the harmonics contained in the output of a UPS connected to a nonlinear load. Experiments with several UPS types have been conducted under various nonlinear loads, as well as charging and discharging of batteries, and the proposed technique significantly reduces harmonics in a system with a HAPFs (hybrid active power filter) based on a unique FLCC (fuzzy logic current controller). In this paper, we use a fuzzy logic controller to generate pulse width modulation (PWM) switching signals in a single-phase half-bridge HAPF. The operation of the proposed PWM-FLCC will be studied in a steady and transient state. Based on a connection between the uninterrupted power supply (UPS) supplying a single-phase power to a nonlinear load, different power filter topologies and a brief review of reference current extraction (RCE) methods used in this study were also included and the most common configurations have been compared with their advantages and disadvantages to ensure the right selection of the power filter for UPS connected with the nonlinear load. The results of the investigation demonstrate that the HAPF with the fuzzy logic current controller has reasonable performance, with a significant reduction in current THD down to 1.09%, as per IEEE-519 standard.
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Et. al., Evseev Alexei Mikhailovich,. "Rectifilter for electric arc plasma plant". Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, nr 2 (10.04.2021): 3130–36. http://dx.doi.org/10.17762/turcomat.v12i2.2358.
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This article presents the results of the development and research of a new type of AC-DC converter - a filter-rectifier (or rectifilter). The object of application of the proposed device is an industrial plant of electric arc plasma processing, the operation of which requires maintaining a constant value of the arc current and is accompanied by a high level of harmonic distortion and consumed reactive energy. From the point of view of the reactive power compensation and harmonic filtering strategy, the rectifilter can be attributed to active electric power filters and FACTS, however, from the position of the main function performed, it is a direct current source, an AC to DC converter, an active rectifier. This work describes in detail the principles of operation of the control system and the hardware architecture of the device. Mathematical modeling of the rectifilter and analysis of the graphs of the consumed alternating current, rectified current, analysis of the harmonic composition and power factor in comparison with the thyristor rectifier of an electric arc plasmatron were carried out.
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Hosseini, Seyed Morteza, Mohammad Hossein Maghami, Parviz Amiri i Mohamad Sawan. "A 13.56 MHz Low-Power, Single-Stage CMOS Voltage-Boosting Rectifier for Wirelessly Powered Biomedical Implants". Electronics 12, nr 14 (19.07.2023): 3136. http://dx.doi.org/10.3390/electronics12143136.
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In this paper, a low-power, single-stage, active rectifier based on a new charge-pump circuit is presented to be used in biomedical implants. The proposed circuit not only rectifies the AC input voltage to a DC voltage but also amplifies the DC output voltage to a higher level. Low-loss MOS switches are used in the structure of the designed circuit to provide high power conversion efficiency. In addition, by using two comparators, the reverse leakage current is somehow eliminated, resulting in a higher increase in the power efficiency. By tying the source and bulk terminals of the utilized transistors, the body effect problem has been solved, and by connecting the p-substrate to the ground, which is the lowest voltage in the circuit, the latch-up phenomenon is eliminated without any extra circuit. The proposed rectifier is implemented and post-layout simulated in a 0.18 µm standard CMOS technology. According to the simulation results, 1.205 V output DC voltage is achieved from an AC input signal with the peak-to-peak amplitude of 1 V at the operating frequency of 13.56 MHz with a 3 kΩ load resistance. The total active area of the designed circuit is 0.167 mm2 with a maximum power conversion efficiency of 98.2%, output power in the range of 0.5–1.5 mW, and voltage conversion ratio of 120%.
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Md.Mazhar-Ul-Haq, S., Dr S.S.Tulasi Ram i Dr JBV.Subramanyam. "Voltage Oriented Control(VOC) Of The PWM Rectifier Using Active Filtering Function". International Journal of Engineering & Technology 7, nr 2.19 (17.04.2018): 90. http://dx.doi.org/10.14419/ijet.v7i2.19.15056.
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Pulse width modulation rectifier has gathered its demand during the recent years for modification needs of the ac-dc conversion systems need for industries, customer and power grid sectors. This bidirectional converter can act as ac to dc boost rectifier with near unity power factor at the grid side along with the regulated and ripple free output voltage at the dc side. This paper deals with the evaluation of control strategy called voltage oriented control with active filtering function, Total harmonic distortion (THD),dynamic performance and parameter sensitivity is studied theoretical concept is provided and results of computer simulations are given by using mat lab.
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Sarker, Mahidur R., Azah Mohamed i Ramizi Mohamed. "Modelling and Simulation an AC-DC Rectifier Circuit Based on Piezoelectric Vibration Sensor for Energy Harvesting System". Applied Mechanics and Materials 785 (sierpień 2015): 131–35. http://dx.doi.org/10.4028/www.scientific.net/amm.785.131.
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This paper presents the modeling of a full-wave rectifier circuit based on piezoelectric vibration transducer for energy-harvester system. Piezoelectric vibration crystals are a viable means of harvesting energy for low-power embedded systems e.g. wireless sensor network. Distinct power handling circuits are assessed with the presence of piezoelectric vibration based energy harvesting transducer. Inside the interface circuit, the voltage should be started up when the AC input voltage is very low to supply a regulated DC voltage up to 2V. An active technique is chosen to design an ultra-low power circuit from a piezoelectric vibration transducer. MOSFET bride ac–dc rectifier, energy storage device e.g. capacitor and boost converter with regulator are the common components of the energy harvesting circuits. An integrated promoter ac-dc rectifier circuit and boost converter that accept a maximum input voltage of 0.3V and provide a regulated output voltage of 2V serve as the supply. The MOSFET and thyristor are considered to develop the proposed circuit replacing conventional ac-dc rectifier due to low input voltage at which diode does not work.
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Edla, Mahesh, Yee Yan Lim, Deguchi Mikio i Ricardo Vasquez Padilla. "Non-Linear Switching Circuit for Active Voltage Rectification and Ripples Reduction of Piezoelectric Energy Harvesters". Energies 15, nr 3 (19.01.2022): 709. http://dx.doi.org/10.3390/en15030709.
Pełny tekst źródłaStreszczenie:
This paper describes an improved non-linear switching circuit (INLSC) for active rectification of voltage and reduction of ripples in the voltage waveform for the piezoelectric energy harvesting (PEH) system. The proposed converter controls the alternating current (AC) generated by the piezoelectric device (PD) under mechanical vibration. The proposed circuit combines the boost and buck-boost processes through a switching process, which functions in both positive and negative cycles. In addition, it controls the voltage and frequency of the load capacitor. In this process, the passive components in the circuit are energised by being short with the AC voltage using switching signals, which facilitates the active rectification of ultra-low AC voltage. Design considerations, theoretical analysis, simulations and experimental results are presented. It was shown that the circuit was able to control the switching signal and to convert low AC voltage (0.44 Vi) to high direct current (DC) voltage (6.5 Vdc) while achieving an output power of 469 µW which outperforms the existing similar circuits and synchronous rectifier circuit. The ripples in the rectified voltage were also comparatively less. Application-wise, the proposed circuit could power a manually connected 7-segments display, commonly used for traffic applications.
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Pan, Liyun, Gang Liu i Qiangang Sun. "An Active Power Factor Correction Technology for Aircraft". Journal of Physics: Conference Series 2290, nr 1 (1.06.2022): 012029. http://dx.doi.org/10.1088/1742-6596/2290/1/012029.
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Abstract This paper analyzes the influence of harmonics on the system and the importance of power factor correction. According to the requirements of aircraft use, an active power factor correction system based on three phase six switch topology is designed. The article analyzes the working process and control method of the system, then designs a rectifier to convert 220V/400Hz AC power provided by the aircraft to DC power and the power factor of the rectifier is high. Moreover, the performance of the system is tested.
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Et. al., D. Sathisha,. "A Simplified Control Approach of AC-DC-TLBC for Bi-Polar DC Microgrid Applications". Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, nr 2 (10.04.2021): 818–24. http://dx.doi.org/10.17762/turcomat.v12i2.1090.
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In this paper the main focus is to convert 3-Phase AC to DC and DC to 3-level Boost conversion for bipolar DC micro grid applications. The input side of AC-DC converter acts as active PWM rectifier and this can be controlled by using a new Min Max (MM) control algorithm to maintain the regulated DC link voltage. The DC link voltage is boosted according to the duty cycle along with voltage balance compensation algorithm in 3-L Boost (TLBC) converter. Hence the combination of two control approaches can provide better dynamic and steady state responses and the output results are carried out by MATLAB /Simulink environment.
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Razali, Azziddin M., Nor Azizah Yusoff, Kasrul Abdul Karim, Auzani Jidin i Tole Sutikno. "A new switching look-up table for direct power control of grid connected 3L-NPC PWM rectifier". International Journal of Power Electronics and Drive Systems (IJPEDS) 12, nr 3 (1.09.2021): 1413. http://dx.doi.org/10.11591/ijpeds.v12.i3.pp1413-1421.
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This paper presents a comprehensive and systematic approach in developing a new switching look-up table for direct power control (DPC) strategy applied to the three-phase grid connected three-level neutral-point clamped (3L-NPC) pulse width modulated (PWM) rectifier. The term of PWM rectifier used in this paper is also known as AC-DC converter. The approach provides detailed information regarding the effects of each multilevel converter space vector to the distribution of input active and reactive power in the converter system. Thus, the most optimal converter space vectors are able to be selected by the switching look-up table, allowing smooth control of the active and reactive powers for each sector. In addition, the proposed DPC utilizes an NPC capacitor balanced strategy to enhance the performance of front-end AC-DC converter during load and supply voltage disturbances. The steady state as well as the dynamic performances of the proposed DPC are presented and analyzed by using MATLAB/Simulink software. The results show that the AC-DC converter utilizing the new look-up table is able to produce almost sinusoidal line currents with lower current total harmonic distortion, unity power factor operation, adjustable DC-link output voltage and good dynamic response during load disturbance.
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Sowmya, R., i S. Rama Reddy. "Proportional Resonant Controlled Dual Active Bridge DC to AC Converter System with Enhanced Response". International Journal of Power Electronics and Drive Systems (IJPEDS) 9, nr 1 (1.03.2018): 316. http://dx.doi.org/10.11591/ijpeds.v9.i1.pp316-322.
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<p>This paper deals with comparison of responses of PI and Proportional Resonant controlled DC to AC Converter systems. The objective of this work is to regulate the output of Dual Active Bridge DC to DC converter (DABDAC). The input DC is converted into high frequency AC using Half bridge inverter. It is stepped up by using step up transformer and then it is rectified. The DC is converted into Low frequency AC using a Half bridge inverter. The open loop DABDAC system, closed loop PI based DABDAC system an Proportional Resonant Controller (PRC)based DABDAC system are designed, modeled and simulated using MATLAB Simulink. The results of PR controlled system are compared with those of PI controlled system. The results indicate that the proposed PRC-DABDAC has better time domain response than PI controlled DABDAC system. The proposed DABDAC system has advantages like high gain and steady state error in output voltage. </p>
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Bai, Linux, i Lifei Shen. "Cascaded Multilevel Rectifier with Common High Voltage Direct Current (HVDC) Bus and Its Control Method". Journal of Nanoelectronics and Optoelectronics 16, nr 10 (1.10.2021): 1560–67. http://dx.doi.org/10.1166/jno.2021.3107.
Pełny tekst źródłaStreszczenie:
In order to realize the voltage equalization and minimize the total harmonic distortion rate of current of cascaded multilevel rectifier with common high voltage Direct Current (HVDC) bus, the cascaded multilevel rectifier with common high voltage DC bus and its control method are studied. The output side DC voltage of the cascade multilevel rectifier with common high voltage DC bus is sampled, and the output DC current signal amplitude is obtained according to the calculated output side DC voltage signal. On this basis, the AC side voltage corresponding to the applied switching state and the switching state corresponding to the rectifier in the sampling period are solved. The driving signal of the switch device is generated and sent to the corresponding switch device to realize the active power factor correction and sinusoidal input current, so as to realize the balanced control of output DC capacitor voltage of cascaded multilevel rectifier with common High-Voltage Direct Current (HVDC) bus. The test results show that this method can effectively control the three-phase output current of the rectifier and ensure the maximum output of the current. The lowest total harmonic distortion rate of the output phase voltage is about 40%, which can effectively ensure the stability of the output phase voltage after control.
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Piasecki, Szymon, J. Rąbkowski i M. P. Kaźmierkowski. "Application of 25mΩ SiC MOSFETs in a 10kVA Grid-Connected AC/DC Converter". Materials Science Forum 858 (maj 2016): 1087–90. http://dx.doi.org/10.4028/www.scientific.net/msf.858.1087.
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This paper presents a grid-connected 10 kVA AC/DC converter built with 25mΩ SiC MOSFETs. The converter design process was based on an optimization procedure, which was applied to find the parameters that provide efficiency of 98.5% and power density of 3 kWA/dm3. The 10 kVA prototype, including LCL filter, was built and tested in various operation modes showing very good performance and high efficiency. The AC/DC converter is also able to act as an active power filter compensating high-order harmonics of the grid current caused by diode rectifier.
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Nami, Ashkan, José Amenedo, Santiago Gómez i Miguel Álvarez. "Active Power Filtering Embedded in the Frequency Control of an Offshore Wind Farm Connected to a Diode-Rectifier-Based HVDC Link". Energies 11, nr 10 (11.10.2018): 2718. http://dx.doi.org/10.3390/en11102718.
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This paper presents a novel active power filtering (APF) scheme embedded in a centralised frequency control of an offshore wind farm (OWF) connected to a high voltage direct current link through a diode rectifier station. The APF is carried out by a voltage source converter (VSC), which is connected to the rectifier station to provide frequency control for the offshore ac-grid. The proposed APF scheme eliminates harmonic currents at a capacitor bank placed at the rectifier station. This leads to a significant reduction in the total harmonic distortion of the offshore ac-grid voltage, and thus, to an improvement in the OWF power. Hence, the rectifier passive ac-filter bank is not needed anymore. A new selective harmonic compensation method based on the dynamic phasor (DP) theory is used in the proposed APF scheme which allows the extraction of the phasor form of harmonics in dc-signals. Therefore, the well-known proportional-integral regulators are used for the harmonic current compensation. Moreover, the offshore ac-grid is modelled for the system harmonic analysis using a grid solution based on the DP theory. Finally, a VSC power rating analysis is studied. The performance of the proposal is validated by simulations in both steady-state and transient conditions.
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Taleb, Maamar, Mohamed Amine Fnaiech i Khaled Zehar. "An Enhanced Hybrid Grid Connected Photovoltaic System Using Voltage Oriented Controller and Class D Chopper". Renewable Energy and Power Quality Journal 21, nr 1 (lipiec 2023): 69–75. http://dx.doi.org/10.24084/repqj21.225.
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The performance of a shunt interconnection made from a PV system, a three phase grid voltage supply, and a DC shunt motor (DC load) is investigated The PV system participates with maximum powers to the overall interconnection active power flow. It uses a class D chopper circuitry controlled properly by a typical maximum power point tracker (MPPT) controller. The grid has the role of supplying active power in case of any power deficiency needed by the DC motor load. Similarly, it has also the role of absorbing active power in case of any additional power generated by the PV system and not needed by the DC load. This is done by using an AC/DC power electronic converter. The AC/DC power electronic converter operates either under rectifier or inverter modes. The AC/DC power electronic converter is also operated under the next two conditions: 1-the reactive power expected at the grid voltage bus should be nearly null, 2-harmonics currents often encountered in the grid line currents waveforms should be tolerable. The two latter conditions are fulfilled by using the principle of voltage oriented control (VOC) technique. The performance of the investigated interconnection is simulated in Matlab/Simulink platform. Quite satisfactory results are obtained. The satisfaction about the obtained simulation results persists on being able to integrate easily the PV system with the AC grid while extracting maximum power from the PVG and having a unity power factor at the AC grid bus and less encountered harmonics in the ac line currents.
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Wrona, Grzegorz, Mariusz Zdanowski, Przemysław Trochimiuk, Jacek Rąbkowski i Radosław Sobieski. "Experimental Validation of 40 kW EV Charger Based on Vienna Rectifier and Series-Resonant Dual Active Bridge". Energies 16, nr 15 (4.08.2023): 5797. http://dx.doi.org/10.3390/en16155797.
Pełny tekst źródłaStreszczenie:
This work presents the experimental validation of a 40 kW electric vehicle (EV) charger. The proposed system comprises two 20 kW modules connected in parallel at the input and output. Each module has two stages—as a grid converter Vienna Rectifier (VR) was chosen, and as an isolated DC/DC stage, two Series-Resonant Dual-Active-Bridges (SRDABs) in input-series-output-parallel (ISOP) configurations were applied. The AC/DC and DC/DC stages were enclosed in 2U rack standard housing. A bipolar DC-link with ±400 V DC voltage was employed to connect both stages of the charger module while the charger’s output is dedicated to serving 800 V batteries. VRs operated at 66 kHz switching frequency and the SRDABs operated at 100 kHz. The converters used in the charger structure were based on silicon carbide (SiC) power devices. The description and parameters of the built hardware prototypes of both—AC/DC and DC/DC—converters are provided. Moreover, the experimental validation of each stage and the whole charging system, including oscilloscope waveforms and power analyzer measurements at nominal power, are included. Such a configuration enables energy conversion with high efficiency without a negative impact on the grid and high-quality grid waveforms.
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Ni, Yi Feng, i Yong Qiang Zhu. "Dual-Current Loops Control Strategy of PWM Rectifier under Unbalanced Grid Voltage Conditions". Applied Mechanics and Materials 556-562 (maj 2014): 2114–18. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.2114.
Pełny tekst źródłaStreszczenie:
The unbalanced grid voltage causes the current harmonics, the fluctuation of the active power in AC side and the fluctuation of the DC voltage. The dual-current loops control strategy can slove those problems. The positive and negative sequence components of grid voltages and currents were calculated based on the symmetrical component method and were used to calculate the instantaneous power in double dq rotate coordinate, which ratate at positive and negative synchronous angular velocity respectively. The dual-current loops control strategy was finally verified in simulation by comparing with the conventional synchronous PI current control. The simulation results show the dual-current loops control strategy is effective on eliminating the fluctuation of the active power in AC side and the fluctuation of the DC voltage.
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Guzmán, Pablo, Nimrod Vázquez, Marco Liserre, Rodolfo Orosco, Joaquín Vaquero i Claudia Hernández. "AC-DC DAB Converter with Power Factor Correction". Energies 16, nr 1 (28.12.2022): 320. http://dx.doi.org/10.3390/en16010320.
Pełny tekst źródłaStreszczenie:
AC-DC conversion is required in many applications, and in some of them isolation is strictly required, certainly while maintaining characteristics such as a high power factor and low input current THD. In this paper, an AC-DC converter, comprising a full-bridge diode rectifier and a dual-active-bridge (DAB) converter, is utilized to fulfill these characteristics. The used modulation makes the converter behave as a resistive load, maintaining the output voltage constant while achieving a high power factor and low input current THD. The operation of the converter is simple, as only two voltage sensors are required, and no inner current loop is utilized. A low-power prototype was experimentally tested to corroborate the proposal.
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Sadeghi, Zahra, Mahdi Shahparasti, Amirhossein Rajaei i Hannu Laaksonen. "Three-Level Reduced Switch AC/DC/AC Power Conversion System for High Voltage Electric Vehicles". Sustainability 14, nr 3 (30.01.2022): 1620. http://dx.doi.org/10.3390/su14031620.
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Two of the main challenges of recent electric vehicles (EVs) are the charging time and high initial cost. To solve the problem associated with long charging time, the car manufacturers are moving from 400 V battery EV (BEV) to 800 V BEV, which enables the utilization of multi-level converters in EV applications. This paper presents a power conversion system consisting of a Vienna rectifier and a two/three level hybrid inverter as a machine-side inverter to drive a permanent-magnet synchronous motor (PMSM). The Vienna rectifier improves the quality of the grid-side current and provides a regulated DC-link voltage. The proposed inverter, known as a 10-switch inverter, offers high output current quality with a lower number of active switches, making it compact and cost-effective. The field-oriented control (FOC), along with the SPWM modulation, is implemented to control the system. A reliable and cost-effective PMSM drive system demands sensorless control; therefore, a sliding mode observer (SMO) is used to estimate the rotor position and velocity. The accuracy of the proposed system was proved through the simulation results from MATLAB/Simulink.
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Cheong, Yanni, Shuyu Cao, Ramasamy Thaiyal Naayagi i Szesing Lee. "Triple Phase Shift Control of Wireless Charging DAB LCC Resonant Converter for Unity Power Factor Operation with Optimized Rectifier AC Load Resistance". Applied Sciences 12, nr 22 (21.11.2022): 11871. http://dx.doi.org/10.3390/app122211871.
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This paper presents a new triple phase shift (TPS) closed-loop control scheme of a dual active bridge (DAB) LCC resonant DC/DC converter to improve wireless charging power transfer efficiency. The primary side inverter phase shift angle regulates the battery charging current/voltage. The secondary side rectifier phase shift angle regulates the rectifier AC load resistance to match its optimized setting. The inverter-to-rectifier phase shift angle is set to achieve unity power factor operation of the DAB rectifier and inverter. The mathematical formulation of the TPS shift control is given for each phase shift angle. The analytical calculation, circuit simulation, and experimental test are carried out in a power scaled-down DAB LCC resonant wireless charging converter laboratory hardware setup to validate the proposed TPS close-loop control scheme. The PLECS circuit simulation shows that DAB LCC resonant SiC MOSFET operates at zero-voltage-switching (ZVS) with a unity power factor in emulated constant current (CC) mode battery charging. In constant voltage (CV) mode operation, one inverter/rectifier Leg does not operate at ZVS switching when Sic MOSFET is switched on near zero current. The experimental results show that the efficiency is greatly improved for CV mode charging with large DC load resistance connected if rectifier AC load resistance matching control is enabled. The measured efficiency matches well with the analytical calculation. The estimated efficiency improvement will be much more significant for EV applications in the kW power range with greater winding loss. The challenges and possible solutions to implement TPS PWM modulation in two separate inverter and rectifier control hardware are explained for future TPS control algorithm development in practical wireless charging products.
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Mapari, Rahul Ganpat, D. G. Wakde, R. G. Tambe, A. B. Kanase i Shivajirao Patil. "Modeling and Simulation of the Single-Phase Unity Power Factor Active Rectifier for Minimizing the Input Current Harmonic Distortions". Applied Mechanics and Materials 267 (grudzień 2012): 91–94. http://dx.doi.org/10.4028/www.scientific.net/amm.267.91.
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This paper presents a modeling and simulation of topology of single-phase AC-DC active rectifier having power factor correction (PFC). This converter topology is evaluated on the basis of performance and its salient features are discussed to analyze its applicability. The technique not only helps to develop a deeper understanding of this converter but also to evaluate performance and feasibility of control strategy and topological features without fabrication of an actual system. This paper also describes technique for minimizing the input current distortion of current-controlled single-phase boost rectifier.
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Lee, Jun-Young, Kyung-Wook Heo, Kyu-Tae Kim i Jee-Hoon Jung. "Analysis and Design of Three-Phase Buck Rectifier Employing UPS to Supply High Reliable DC Power". Energies 13, nr 7 (3.04.2020): 1704. http://dx.doi.org/10.3390/en13071704.
Pełny tekst źródłaStreszczenie:
In the DC distribution system, to step down the DC voltage level from the AC grid voltage, the conventional topologies require multiple power conversion stages and bulky line-frequency transformers, which degrade their power density and cost-effectiveness. In addition, the conventional topologies suffer from a shoot-through problem resulting in their low system reliability. In this paper, to overcome the above issues, systematic design approaches of a three-phase buck rectifier with an uninterruptible power supply (UPS) and a protection algorithm are proposed to obtain the high reliability of the DC distribution system, which can deal with fault conditions and can regulate the output voltage level. It only requires a single stage of the three-phase buck rectifier. Also, a thyristor switch is added without any commutation circuits to cut off the output from the fault circuit. The shoot-through faults do not occur in the buck rectifier, leading to high reliability. A dual-active-bridge (DAB) DC-DC converter is applied as the UPS to supply the electric power from the battery when the buck rectifier is shut down under the fault conditions. Finally, the protection algorithm is proposed to detect the fault conditions and to regulate the output voltage level.
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Kshatriya, Vamshi Krishna Varma, i Ram Kumar A. "A Novel M-SEPIC DC-DC Converter for BLDC Pumping System with Active PFC using ANFIS Controller". Indonesian Journal of Electrical Engineering and Computer Science 11, nr 1 (1.07.2018): 386. http://dx.doi.org/10.11591/ijeecs.v11.i1.pp386-399.
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An exigent consumer related concerns confronted due to utilization of massive front-end AC-DC rectifier in a grid-tied BLDC pumping system. Harmonic distortions are acquired, which prompts the disruption of power quality at utility grid system due to AC-DC conversion. Several factors for enhancing power-quality concerns are ameliorate the grid power-factor along with reduction of harmonic distortions, tightened regulation of DC output voltage. In this way, the DC-DC boost converter plays a unique role; operated in Continuous Conduction Mode. Based on summarizing advantages & disadvantages of classical DC-DC converters, a single switch high voltage gain M-SEPIC DC-DC converter is more suggestive for water pumping system due to non-existence of coupled inductors, low switching loss, low di/dt stress, high efficiency, compact structure, low cost, etc. This work proposes the novel M-SEPIC DC-DC converter fed brushless-DC motor drive is controlled by voltage source inverter and powered by single-phase grid system with improved power-quality features. Moreover, Adaptive Neuro-Fuzzy Inference System is recommended for prediction of optimal switching states to amplify the BLDC motor speed and torque-ripple depreciation. The effectiveness of the proposed scheme is validated under constant speed situations by real-time operating conditions which are evaluated by Matlab /Simulink tool; and simulation results are conferred with attractive comparisons.
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Qiu, Mingjie, Ping Wang, Huakun Bi i Zhishuang Wang. "Active Power Decoupling Design of a Single-Phase AC–DC Converter". Electronics 8, nr 8 (27.07.2019): 841. http://dx.doi.org/10.3390/electronics8080841.
Pełny tekst źródłaStreszczenie:
The second-order ripple power of single-phase converter causes second-order ripple voltages on the DC bus. For eliminating second-order ripple components, passive power decoupling methods including DC bus electrolytic capacitors have some shortcomings, such as low power density and poor stability of converters. Thus, an active power decoupling method based on a single-phase converter is proposed in this paper. The control method, taking single-phase voltage source pulse width modulation (PWM) rectifier (single-phase VSR) as the basic converter and adopting a buck-boost power decoupling circuit, introduces second-order ripple of DC bus voltage into a power decoupling circuit. The ripple acts as compensation of the phase deviation between the command value and the actual value of the second-order ripple current. Therefore, estimation of the second-order ripple current is more accurate, the power decoupling circuit absorbs the second-order ripple power behind the H-bridge more completely, and the DC bus voltage ripple is effectively suppressed accordingly. Finally, experimental results of the single-phase VSR are given to verify the validity of the proposed method.
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Kim, Seongwan, i Hyeonmin Jeon. "Comparative Analysis on AC and DC Distribution Systems for Electric Propulsion Ship". Journal of Marine Science and Engineering 10, nr 5 (20.04.2022): 559. http://dx.doi.org/10.3390/jmse10050559.
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Decarbonization is an ongoing issue in the shipping industry, and electric propulsion systems are being proposed as alternative solutions to satisfy this requirement. To answer the fundamental questions of “Are electric propulsion systems the green solution?” and “Can DC distribution systems contribute to the decarbonization in shipping?”, this paper analyzed DC distribution system electrical characteristics, economic feasibility, and environmental evaluation for a full-scale AC-DC hybrid distribution electric propulsion system facility. By applying the actual ship’s operating profile as inputs, a DC distribution system with an active front end rectifier and a variable speed generator engine was proven to guarantee the same electric stability as the conventional AC distribution system. The life cycle assessment results achieved economic and life cycle environmental benefits of about 10% (8.9% for Case 1 and 12.4% for Case 2). These research findings offer meaningful insights into the DC distribution system to minimize fuel consumption and emissions toward cleaner shipping.
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Sulong, Dome, i Chuttchaval Jeraputra. "A Grid Connected Flyback Inverter with a DC Active Filter for Photovoltaic Cells". Applied Mechanics and Materials 781 (sierpień 2015): 406–9. http://dx.doi.org/10.4028/www.scientific.net/amm.781.406.
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This paper presents the design and control of a grid-connected flyback inverter with a DC active filter for photovoltaic (PV) cells. The proposed topology consists of a flyback DC-AC inverter and a DC active filter that can operate independently. The flyback inverter, controlled in digital peak current mode, regulates the full-wave rectified sinusoidal current later, which is alternately inverted and injected into the grid. The DC active filter regulates the smooth current/power drawn from a PV module by using cascaded proportional-integral (PI) controllers. Analysis, design and control of the proposed topology are presented. A 100W/220V/50Hz prototype is developed and tested. The experimental results show that the proposed flyback inverter with a DC active filter is capable of regulating a sinusoidal current fed into the grid, actively filtering the DC current/power and achieving reasonably high energy conversion efficiency.
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Qu, Wei Dong, Jian Wen Ren i Xian Chao Liu. "Study on VSC-HVDC Connecting to Passive Network and Its Control Strategies". Advanced Materials Research 960-961 (czerwiec 2014): 1371–75. http://dx.doi.org/10.4028/www.scientific.net/amr.960-961.1371.
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The mathematical model VSC-HVDC system in dq reference frame is derived.For the VSC-HVDC system of transmitting power to passive network ,a constant DC voltage is used in the rectifier-side;a constant AC voltage controller is used in the inverter-side.Digital simulation models are set up by MATLAB/Simulink. Simulation results verify that VSC-HVDC has a independent control of active and passive power,and demonstrates superiority of transmitting active and passive power simultaneously when connecting to passive network.
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Almarri, Noora, Peter Langlois, Dai Jiang i Andreas Demosthenous. "Efficient Dual Output Regulating Rectifier and Adiabatic Charge Pump for Biomedical Applications Employing Wireless Power Transfer". Journal of Low Power Electronics and Applications 13, nr 1 (4.03.2023): 20. http://dx.doi.org/10.3390/jlpea13010020.
Pełny tekst źródłaStreszczenie:
A power management unit (PMU) is an essential block for diversified multi-functional low-power Internet of Things (IoT) and biomedical electronics. This paper includes a theoretical analysis of a high current, single-stage ac-dc, reconfigurable, dual output, regulating rectifier consisting of pulse width modulation (PWM) and pulse frequency modulation (PFM). The regulating rectifier provides two independently regulated supply voltages of 1.8 V and 3.3 V from an input ac voltage. The PFM control feedback consists of feedback-driven regulation to adjust the driving frequency of the power transistors through adaptive buffers in the active rectifier. The PWM/PFM mode control provides a feedback loop to adjust the conduction duration accurately and minimize power losses. The design also includes an adiabatic charge pump (CP) to provide a higher voltage level. The adiabatic CP consists of latch-up and power-saving topologies to enhance its power efficiency. Simulation results show that the dual regulating rectifier has 94.3% voltage conversion efficiency with an ac input magnitude of 3.5 Vp. The power conversion efficiency of the regulated 3.3 V output voltage is 82.3%. The adiabatic CP has an overall voltage conversion efficiency (VCE) of 92.9% with a total on-chip capacitance of 60 pF. The circuit was designed using 180 nm CMOS technology.
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Frisfelds, K., i O. Krievs. "Design of a Three-Phase Bidirectional PWM Rectifier with Simple Control Algorithm". Latvian Journal of Physics and Technical Sciences 56, nr 3 (1.06.2019): 3–12. http://dx.doi.org/10.2478/lpts-2019-0015.
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Abstract The paper covers the main aspects of designing a low voltage three-phase PWM rectifier for bidirectional AC/DC power flow with unity power factor. A model in Matlab/Simulink environment has been built for a 10kW active rectifier with an LCL filter connected to grid side of the rectifier. The primary goal of the model is to achieve low grid current harmonic content for frequency ranges described in worldwide applicable standards and above. LCL filter parameter design procedure is described in the paper and implemented in the rectifier model to achieve a better power quality with limitations in passive element size. A simple “p-q” theory-based voltage oriented control algorithm is used in the model and described in the present paper. Model performance is characterised by dynamic response, stability and grid parameters during simulation. The simulation results demonstrate that the modelled rectifier system is stable and the grid current harmonic content is low both in the low-and high-frequency ranges.
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Siton, Yarden, Moshe Sitbon, Ilan Aharon, Simon Lineykin, Dmitry Baimel i Alon Kuperman. "On the Minimum Value of Split DC Link Capacitances in Three-Phase Three-Level Grid-Connected Converters Operating with Unity Power Factor with Limited Zero-Sequence Injection". Electronics 12, nr 9 (25.04.2023): 1994. http://dx.doi.org/10.3390/electronics12091994.
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This paper introduces an approach to calculating the minimum value of split DC link capacitance in three-phase three-level grid-connected DC-AC converters operating with unity power factor without either active balancing circuits or AC zero sequence injection. Due to the fact that partial DC link voltages and rectified mains phase voltages reach their maximum and minimum values, respectively, at different time instants, it is feasible to decrease the minimum value of the former below the maximum value of the latter while still maintaining proper functionality of the power stage. The minimum possible split DC link capacitance values are hence derived from the boundary condition where the above-mentioned voltages are tangent to each other. The accuracy of the analytical derivations is confirmed by simulations and experiments carried out on a 10 kVA T-type converter prototype, which show a high degree of agreement.
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Zhang, Jin Fang, En Li Yao i Jin Chao Xing. "LADRC Control for the Three-Phase Voltage-Type PWM Rectifier". Advanced Materials Research 591-593 (listopad 2012): 1531–34. http://dx.doi.org/10.4028/www.scientific.net/amr.591-593.1531.
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In the three-phase voltage-type pulse width modulation (PWM) inverter system, the steady DC-bus voltage is significant for normal operation of PWM converter. With traditional control method, DC-bus voltage has poor anti-disturbance performance and large steady-state error generated by parametric uncertainties of inductive resistance and switching devices’ equivalent resistance. To cope with these problems, a linear active disturbance rejection control (LADRC) controller is designed based on the advantages of the LADRC in processing system internal perturbation and external disturbance. The simulation study shows that under the same disturbance the proposed method can realize not only faster dynamic response and better property of anti-disturbance performance, but also unity power factor control. For the uncertainties of AC equivalent resistance and inductance, the method shows strong adaptability and robustness.
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Wu, Haotian, Zhong Wei i Shiwen Liu. "Optimal Control Strategy of Back-to-Back Converter Based on AC/DC Voltage Source Converter". Mobile Information Systems 2022 (15.07.2022): 1–14. http://dx.doi.org/10.1155/2022/3104149.
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The back-to-back converter is a converter system composed of two voltage source converters (VSC). Because VSC can regulate the output of active and reactive power, the back-to-back converter has a good dynamic and static performance. However, not all passive loads are three-phase symmetrical. The existing control strategy may lead to asymmetric output voltage when back-to-back converter is used to supply unbalance load. Usually, an inner loop d/q decoupling controller, a constant DC voltage controller of the rectifier side, and a constant AC voltage controller of the inverter side are established. In this article, in order to improve the rectifier side, fuzzy online self-tuning is used to increase PI parameters on the outer voltage loop. PI control is replaced by PR control on the inner current loop. The improved rectifier control can reduce the overshoot and the output of harmonics. For the inverter side, the three-phase voltage will be imbalanced. Therefore, using PR control, which can track a sinusoidal signal without steady-state error, the control strategy of inverter is changed into “outer loop constant voltage and PR control-inner loop current d/q decoupling control.” This strategy can solve the unbalance problem of three-phase AC output. The simulation results show that the control strategy can solve the problem of asymmetric output voltage of the inverter side effectively.