Готові списки джерел за темами / AC-DC Active Rectifiers

Добірка наукової літератури з теми "AC-DC Active Rectifiers"

Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "AC-DC Active Rectifiers"

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Xiao, Lingfei, Robert R. Sattarov, Peisong Liu, and Cong Lin. "Intelligent Fault-Tolerant Control for AC/DC Hybrid Power System of More Electric Aircraft." Aerospace 9, no. 1 (December 22, 2021): 4. http://dx.doi.org/10.3390/aerospace9010004.

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Анотація:
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, and Gianpaolo Vitale. "AC-DC Converters for Electrolyzer Applications: State of the Art and Future Challenges." Electronics 9, no. 6 (May 29, 2020): 912. http://dx.doi.org/10.3390/electronics9060912.

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Анотація:
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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3

Gibbs, I., and D. Kimmel. "Active Current Balance between Parallel Thyristors in Multibridge AC-DC Rectifiers." IEEE Power Engineering Review 21, no. 11 (November 2001): 53–54. http://dx.doi.org/10.1109/mper.2001.4311136.

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Barbosa, P. G., J. A. Santisteban, and E. H. Watanabe. "Shunt-series active power filter for rectifiers AC and DC sides." IEE Proceedings - Electric Power Applications 145, no. 6 (1998): 577. http://dx.doi.org/10.1049/ip-epa:19981932.

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5

Sal y Rosas, Damian, Daniel Chavez, David Frey, and Jean-Paul Ferrieux. "Single-Stage Isolated and Bidirectional Three-Phase Series-Resonant AC–DC Converter: Modulation for Active and Reactive Power Control." Energies 15, no. 21 (October 30, 2022): 8070. http://dx.doi.org/10.3390/en15218070.

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Анотація:
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, and 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, no. 2 (February 7, 2022): 35. http://dx.doi.org/10.3390/wevj13020035.

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Анотація:
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, and H. Miloudi. "Measurement and analysis of common and differential modes conducted emissions generated by an AC/DC converter." Electrical Engineering & Electromechanics, no. 4 (July 8, 2022): 63–67. http://dx.doi.org/10.20998/2074-272x.2022.4.09.

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Анотація:
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., and D. S. Kimmel. "Active current balance between parallel thyristors in multi-bridge AC-DC rectifiers." IEEE Transactions on Energy Conversion 16, no. 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, no. 1 (March 30, 2022): 44–52. http://dx.doi.org/10.47026/1810-1909-2022-1-44-52.

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Анотація:
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, and P. Bhatt. "A Review on Direct Power Control for Applications to Grid Connected PWM Converters." Engineering, Technology & Applied Science Research 5, no. 4 (August 17, 2015): 841–49. http://dx.doi.org/10.48084/etasr.544.

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Анотація:
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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Більше джерел

Дисертації з теми "AC-DC Active Rectifiers"

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Haryani, Nidhi. "Zero Voltage Switching (ZVS) Turn-on Triangular Current Mode (TCM) Control for AC/DC and DC/AC Converters." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/96397.

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Анотація:
One of the greatest technological challenges of the world today is reducing the size and weight of the existing products to make them portable. Specifically, in electric vehicles such as electric cars, UAVs and aero planes, the size of battery chargers and inverters needs to be reduced so as to make space for more parts in these vehicles. Electromagnetic Interference (EMI) filters take up a more than 80 % of these power converters, the size of these filters can be reduced by pushing the switching frequency higher. High frequency operation (> 300 kHz) leads to a size in reduction of EMI filters though it also leads to an increase in switching losses thus compromising on efficiency. Thus, soft switching becomes necessary to reduce the losses, adding more electrical components to the converter to achieve soft switching is a common method. However, it increases the physical complexity of the system. Hence, advanced control methods are adopted for today's power converters that enable soft switching for devices specifically ZVS turn-on as the turn-off losses of next generation WBG devices are negligible. Thus, the goal of this research is to discover novel switching algorithms for soft turn-on. The state-of the-art control methods namely CRM and TCM achieve soft turn-on by enabling bi-directional current such that the anti-parallel body diode starts conducting before the device is turned on. CRM and TCM result in variable switching frequency which leads to asynchronous operation in multi-phase and multi-converter systems. Hence, TCM is modified in this dissertation to achieve constant switching frequency, as the goal of this research is to be able to achieve ZVS turn-on for a three-phase converter. Further, Triangular Current Mode (TCM) to achieve soft switching and phase synchronization for three-phase two-level converters is proposed. It is shown how soft switching and sinusoidal currents can be achieved by operating the phases in a combination of discontinuous conduction mode (DCM), TCM and clamped mode. The proposed scheme can achieve soft switching ZVS turn-on for all the three phases. The algorithm is tested and validated on a GaN converter, 99% efficiency is achieved at 0.7 kW with a density of 110 W/in3. The discussion of TCM in current literature is limited to unity power factor assumption, however this limits the algorithm's adoption in real world applications. It is shown how proposed TCM algorithm can be extended to accommodate phase shift with all the three phases operating in a combination of DCM+TCM+Clamped modes of operation. The algorithm is tested and validated on a GaN converter, 99% efficiency is achieved at 0.7 kVA with a density of 110 W/in3. TCM operation results in 33 % higher rms current which leads to higher conduction losses, as WBG devices have lower on-resistance, these devices are the ideal candidates for TCM operation, hence to accurately obtain the device parameters, a detailed device characterization is performed. Further, proposed TCM+DCM+Clamped control algorithm is extended to three-level topologies, the control is modified to extract the advantage of reduced Common Mode Voltage (CMV) switching states of the three-level topology, the switching frequency can thus be pushed to 3 times higher as compared to state-of-the-art SVPWM control while maintaining close to 99 % efficiency. Two switching schemes are presented and both of them have a very small switching frequency variation (6%) as compared to state-of-the-art methods with >200% switching frequency variation.
Doctor of Philosophy
Power supplies are at the heart of today's advanced technological systems like aero planes, UAVs, electrical cars, uninterruptible power supplies (UPS), smart grids etc. These performance driven systems have high requirements for the power conversion stage in terms of efficiency, density and reliability. With the growing demand of reduction in size for electromechanical and electronic systems, it is highly desirable to reduce the size of the power supplies and power converters while maintaining high efficiency. High density is achieved by pushing the switching frequency higher to reduce the size of the magnetics. High switching frequency leads to higher losses if conventional hard switching methods are used, this drives the need for soft switching methods without adding to the physical complexity of the system. This dissertation proposes novel soft switching techniques to improve the performance and density of AC/DC and DC/AC converters at high switching frequency without increasing the component count. The concept and the features of this new proposed control scheme, along with the comparison of its benefits as compared to conventional control methodologies, have been presented in detail in different chapters of this dissertation.
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Hamed, Ibrahim. "Comparison between Active and Passive AC-DC Converters For Low Power Electromagnetic Self-Powering Systems : A theoretical and experimental study of low power AC-DC converters." Thesis, Mittuniversitetet, Institutionen för elektronikkonstruktion, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-39600.

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Анотація:
Electromagnetic based energy harvesting systems such as Variable reluctance energy harvesting systems (VREH) have shown to be an effective way of extracting the energy of rotating parts. The transducer can provide enough power to run an electronic sensing system, but the problem arises in finding an efficient way of rectifying that power to generate a stable energy supply to run a system, which this report will investigate. Active and passive voltage doublers have proven to be a suitable candidate in solving this issue due to the simplicity and the small footprint. This thesis will aim to compare active and passive voltage doublers under various scenarios in order to understand under which circumstances are active or passive voltage doublers to be preferred. From the conducted experimental measurements, this thesis concluded that active voltage doublers are recommended during high RPMs (>10 RPM) while passive voltage doublers (especially fullwave voltage doubler) is recommended at lower RPMs. Quality of power also plays a significant role in this study. Therefore, measurements have also been done for ripple and rise time. From the measurements, this thesis can conclude that the overall power quality was the best in Full-wave voltage doublers, while Active-voltage doublers had lower ripple than FWVDs at higher current loads.
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Raval, Chintan A. "Three-phase ac-dc power supply design and experiments using a sic based power module." Thesis, Kansas State University, 2017. http://hdl.handle.net/2097/35520.

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Анотація:
Master of Science
Department of Electrical and Computer Engineering
Behrooz Mirafzal
The rise of Wide Band Gap (WBG) devices has brought excitement in the field of Power converters. The WBG based converter can operate at the very high frequency and temperature making them ideal to use in harsh environments. The commercialization of WBG devices such as SiC and GaN MOSFETs has made it interesting for power engineering professionals all over the world. The use of WBG devices capable of operating at high switching frequencies reduces the overall system size dramatically with added benefit of improved power quality at high temperature. The main goal of this thesis is to design and test an AC-DC converter based on a SiC power module. The designed rectifier can be considered an active rectifier equipped with a controller to constantly provide feedback for modification of switching signals to get the desired output voltage. The designed active rectifier converts the varying frequency input power supply into rectified DC voltage while keeping the power factor of the system to unity. This thesis covers elementary information on power supply design, switching schemes and design of the controller. System arrangement will provide more light on the use of Six Channel MOSFET Gate Driver from CREE with the overall experimental setup. The experimental analysis will summarize the behavior of the system where information on achieved rectification, effect on the line currents at the generator and concluding power factor representation is described.
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Mandrioli, Riccardo. "A modular interleaved converter for output current ripple minimization in dc fast chargers for electric vehicles." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18995/.

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Анотація:
In this work, a DC off-board fast battery charger topology is presented, designed, and tested. It is expected to be able to fight the range anxiety by significantly diminish the EVs' charging times up to 15-20 minutes, meanwhile keeping low manufacturing, Operation and Maintenance (O&M) costs. The charger is made out of two main power stages the AC/DC and DC/DC converters. In order to keep the costs lower as possible, both parts are designed using interleaved topologies organized by using the same two-level three-phase modules coupled through reactors. This architecture allows to use the already well-known industrial three-phase modules taking advantage of the benefits guaranteed by mass production and at the same time permitting an effortless expansion thanks to its modularity. Thanks to the interleaved connections, it is possible to reach a high efficiency by distributing current and power evenly among the legs. Furthermore, this topology can handle bidirectional power flows, and it might be used for operating in both Grid to Vehicle (G2V) and Vehicle to Grid (V2G) modalities. In order to reduce the dimensions, and the costs of the filters, a control strategy able to keep a zero current ripple at any operative condition is developed. The proposed charger architecture uses an AC input BUS followed by an active rectifier stage. A ripple-free strategy acts on the variable DC BUS voltage according to the chopper duty cycle keeping the current ripple null. Meanwhile, DC/DC provides the requested output current. This strategy involves the AC/DC with the tasks to regulate the DC BUS voltage level and correcting the input power factor. A model-based control system ensures that every leg’s current follows an average current reference signal. Legs’ currents are actively rebalanced throughout a current rebalancing network. Finally, the simulation results are carried out trough MATLAB Simulink and validated with laboratory measurements on an adequately scaled prototype.
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5

Eleyele, Abidemi Oluremilekun. "Isolated Single-Stage Interleave Resonant PFC Rectifier with Active and Novel Passive Output Ripple Cancellation Circuit." Thesis, Uppsala universitet, Institutionen för elektroteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-423117.

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Анотація:
With the increasing demand for fast, cheaper, and efficient power converters come the need for a single-stage power factor correction (PFC) converter. Various single-stage PFC converter proposed in the literature has the drawback of high DC bus voltage at the input side and together with the shift to wide bandgap switches like GaN drives the converter cost higher. However, an interleaved topology with high-frequency isolation was proposed in this research work due to the drastic reduction in the DC bus voltage and extremely low input current ripple thereby making the need for an EMI filter circuit optional.   Meanwhile, this research work focuses on adapting the proposed topology for a high voltage low current application (EV charger - 400V, 7KW) and low voltage high current application (telecom power supply - 58V,  58A) owing to cost benefits. However, all single-stage PFC are faced with the drawback of second-order (100Hz) output harmonic ripple. Therefore, the design and simulation presented a huge peak to peak ripple of about 50V/3A and 26V/26A for the EV charger and telecom power supply case, respectively. This created the need for the design of a ripple cancellation circuit as the research required a peak to peak ripple of 8V and 200mV for the EV - charger and telecom power supply, respectively.   A novel output passive ripple cancellation technique was developed for the EV charger case due to the ease it offers in terms of control, circuit complexity and extremely low THDi when compared with the active cancellation approach. The ripple circuit reduced the 50V ripple to 431mV with the use of a total of 2.2mF capacitance at the output stage.   Despite designing the passive technique, an active ripple cancellation circuit was designed using a buck converter circuit for the telecom power supply. The active approach was chosen because the passive has a slow response and incurs more loss at a high current level. Adding the active ripple cancellation circuit led to a quasi-single stage LLC PFC converter topology. A novel duty-ratio feedforward control was added to synchronize the PFC control of the input side with the buck topology ripple cancellation circuit. The addition of the ripple circuit with the feedforward control offered a peak to peak ripple of 6.7mV and a reduced resonant inductor current by half.   After analysis, an extremely low THDi of 0.47%, PF of 99.99% and a peak efficiency of 97.1% was obtained for the EV charger case. The telecom power supply offered a THDi of 2.3%, PF of 99.96% with a peak efficiency of 95%.
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Aban, Vahap Volkan. "The Design, Control, And Performance Analysis Of Ac Motor Drives With Front End Diode Rectifier Utilizing Low Capacitance Dc Bus Capacitor And Comparison With Conventional Drives." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12615099/index.pdf.

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Анотація:
In this thesis the design, control, stability, input power quality, and motor drive performance of ac motor drives with front end three phase diode rectifiers utilizing low capacitance dc bus capacitor are investigated. Detailed computer simulations of conventional motor drives with diode rectifier front end utilizing high capacitance dc bus capacitor and the drives with low capacitance dc bus capacitor are conducted and the performances are compared. Performance evaluation of various active control methods found in previous studies aiming to provide the dc bus stability of drives with low capacitance dc bus capacitor are done at various load levels and types. Design recommendations are provided for the drives utilizing low capacitance dc bus capacitor.
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7

Macík, Tomáš. "Model trojfázové umělé sítě." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413220.

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Анотація:
The Diploma thesis deals with control of three-phase active rectifier and a three-phase DC/AC converter. It also explains phase-locked loop principle. The theoretical part including first three chapters lists several control approaches to three phase active rectifier and three phase DC/AC converter. Described control approaches to the active rectifier are control in dq frame and control in dq UVW frame. Listed control approaches to the DC/AC converter include cascaded control structure and a full state feedback control. The practical part is divided into last three chapters and includes mathematical description of phase-locked loop principle, model of active rectifier controlled in dq frame and a model of DC/AC converter controlled both by a cascaded control and a full¬ state feedback. The models are created in Matlab Simulink.
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Nimesh, V. "Dual Comparison One Cycle Control for Grid Connected Converters." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/4321.

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Анотація:
Grid connected converters are widely used as front end rectifiers, interface between renewable energy and grid, and power quality applications. Popular control techniques to generate gating signals for active devices, reported in literature are voltage-oriented control, direct power control and one cycle control. In literature, one cycle control has also been reported as scalar resistive emulation or unified constant frequency integration control. The above-mentioned control techniques has been collectively addressed as conventional one cycle control (C-OCC). Light load instability and steady state dc offset phenomenon are the major concerns with of the conventional one cycle control reported in literature. These issues were addressed in the literature by treating them independently. This thesis proposes a common solution to address the light load instability and steady state dc offset phenomenon of conventional one cycle control. C-OCC employs peak detection comparison method, hence the peak of the current always confines with the grid voltage. Therefore, the average current will differ by the ripple error. This results in the steady state dc offset, which is more severe at light load. Further in C-OCC, since the valley of current is not controlled a localized sub-harmonic instability occurs when slope of the falling current is greater than that of the slope of carrier. This thesis proposes a method to control both peak and valley of current, such that the converter changes its state when the expected value of current has been attained. Valley of current in each carrier cycle is decided such that the current has no steady state dc offset in current. To control peak and valley of current, this comparison is necessitated once more. This results in two comparisons in a carrier cycle, hence the name dual comparison one cycle control (DC-OCC). A generalized approach for controlling average current in a carrier cycle for grid connected converter has been proposed. Stability of the inherent current loop in DC-OCC, using propagation dynamics of small disturbance, showed that the proposed control strategy did not suffer from localized sub-harmonic instability. In a converter controlled by C-OCC and DC-OCC, the current lags the grid voltage. The reason for this has been discovered to be the inductive drop across the boost inductor. A novel method to compensate for the inductive drop is proposed in this thesis. The sensed input current is modified by adding a 90°phase shifted current with appropriate gain and is used for comparison to generate gating signals for active devices. The sensed input current is added with a fictitious current, generated from gating signal of the active devices, to enable bi-directional power ow in converters controlled by DC-OCC. A second order band pass filter (BPF) is used to generate the fictitious current from the gating signal. Effects of BPF corner frequency in quality of current drawn or injected into the grid is used during the design of the filter. The sum of sensed input current and fictitious current, is further modified by adding a 90°phase shifted current with appropriate gain. This modification enabled the converter to draw or inject power at an adjustable displacement power factor. Moreover, this modification also enables the converter to operate as a STATCOM. The gain of the phase shifted current determines the phase of the current drawn or injected. The current loop showed a tendency to become unstable when the gain of the phase shifted current approached 0.5. Small signal model of the converter is used to analyze this instability. Average modeling technique is used to derive the model of the converter controlled by DC- OCC. Further, the non-linear average model is linearized using small signal analysis. The small signal model shows the presence of an inherent current loop with a proportional controller. Gain of the proportional controller is the effective resistance seen by the current loop. As the gain of the phase shifted current loop approaches 0.5, the closed poles of the inherent current loop crosses over to the right half of s-plane, causing an instability in the current loop. Design of voltage loop controller parameters is also presented in this thesis. All of the above modifications are validated in simulations and experiments. Simulation and experimental results are presented in this thesis for converters in the range from 600 W to 2 kW.
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Brolund, Andreas. "Evaluation of power quality and common design concept for AC-DC converters in aircraft." Thesis, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-337969.

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This master thesis has been carried out in collaboration with Saab, Avionics Systems in Jönköping, Sweden, during the spring of 2017. The thesis investigates unidirectional rectifier topologies in aircraft and the focus has been on evaluating the power quality requirements according to the aircraft standards, in the course of the More Electric Aircraft concept. Both passive and active power factor correction topologies are considered, discussed and compared. Simulation models are designed in MATLAB/Simulink and the procedures are presented. A modular concept regarding components is discussed where different power supplies and loads are considered. The simulations present both a passive 12-pulse auto-transformer rectifier unit and an active Delta-switch rectifier fulfilling requirements for aircraft such as the total harmonic distortion of the supply current. In addition, the input power factor is close to unity and an efficiency greater than 97% is obtained. Lastly, future aspects of each topology are discussed and necessary improvements to obtain realistic simulation models are presented.
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Частини книг з теми "AC-DC Active Rectifiers"

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"AC/DC Conversion." In Technologies for Electrical Power Conversion, Efficiency, and Distribution, 50–97. IGI Global, 2010. http://dx.doi.org/10.4018/978-1-61520-647-6.ch004.

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Figure 1 displays a power electronic converter connected to the mains. In general, a power electronic converter is an electrical power converter – controlled or uncontrolled rectifier, AC regulator, compensator of reactive power, converter of phase number, active power filter. The converter supplies a load with power Pout, and in the same time it loads the mains with active power P and total power S.
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Тези доповідей конференцій з теми "AC-DC Active Rectifiers"

1

Gelman, Vitaly. "Energy Savings With Reversible Thyristor Controlled Rectifier." In 2009 Joint Rail Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/jrc2009-63013.

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The paper deals with energy savings in Traction Systems available with Thyristor Controlled Rectifiers (TCR) and Reversible TCR (RTCR). TCR provides active voltage control, RTCR in addition has power recuperation into AC line. The energy balance of the TCR and diode rectifier systems are calculated, including losses in the rails, car’s power train and friction losses. The TCR advantages over diode rectifiers: better voltage regulation and fault current limiting allow us to reduce the number of substations and increase their service life. Major energy savings are through recuperation back to AC line using RTCR, with additional savings through increased DC bus voltage. The estimated energy savings depending on the system parameters, train speed profile, etc. can be as high as 50%.
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Nimesh, V., and Vinod John. "Inductive drop compensation in one cycle controlled AC-DC active rectifiers." In 2015 IEEE International Transportation Electrification Conference (ITEC). IEEE, 2015. http://dx.doi.org/10.1109/itec-india.2015.7386945.

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Moia, J., J. Lago, A. J. Perin, and M. L. Heldwein. "Comparison of three-phase PWM rectifiers to interface Ac grids and bipolar Dc active distribution networks." In 2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG). IEEE, 2012. http://dx.doi.org/10.1109/pedg.2012.6254005.

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Chen, Junyu, Hongfei Wu, Jianxin Zhu, Lin Li, and Yan Xing. "A Three-Phase AC/DC Power System with Paralleled Active and Passive Rectifiers for Low-Frequency Pulsed Load Applications." In 2020 IEEE 9th International Power Electronics and Motion Control Conference (IPEMC2020-ECCE Asia). IEEE, 2020. http://dx.doi.org/10.1109/ipemc-ecceasia48364.2020.9368109.

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Abbasi, Mehdi, and John Lam. "An SiC-Based AC/DC CCM Bridgeless Onboard EV Charger With Coupled Active Voltage Doubler Rectifiers for 800-V Battery Systems." In 2020 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2020. http://dx.doi.org/10.1109/apec39645.2020.9124294.

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Abbasi, Mehdi, and John Lam. "An Interleaved Bridgeless AC/DC Stacked SiC Switches Based LLC Converter with Semi-Active Rectifiers for EV High Voltage Battery Systems." In 2021 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2021. http://dx.doi.org/10.1109/ecce47101.2021.9595215.

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Alam, Md Didarul, Md Ziaur Rahman Khan, and M. A. Choudhury. "Flyback AC-DC Rectifier with Active Power Factor Correction." In 2018 10th International Conference on Electrical and Computer Engineering (ICECE). IEEE, 2018. http://dx.doi.org/10.1109/icece.2018.8636813.

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Zeng, H., T. Zhou, K. Xu, X. Ma, and J. Li. "The active and reactive power characteristic analysis and decoupling control of current source PWM rectifier." In 18th International Conference on AC and DC Power Transmission (ACDC 2022). Institution of Engineering and Technology, 2022. http://dx.doi.org/10.1049/icp.2022.1296.

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Ling, W., and W. Fangjie. "Research on control strategy of reducing the action times of tap changer at rectifier and inverter." In 18th International Conference on AC and DC Power Transmission (ACDC 2022). Institution of Engineering and Technology, 2022. http://dx.doi.org/10.1049/icp.2022.1246.

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Reinhold, Andreas, Uwe Radel, Rolf Grohmann, and Jurgen Petzoldt. "AC side parallel-series active filter with DC voltage control capability of a diode rectifier." In 2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe). IEEE, 2015. http://dx.doi.org/10.1109/epe.2015.7309184.

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