Дисертації з теми "Bi-directional Power Converters"
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Han, Sangtaek. "High-power bi-directional DC/DC converters with controlled device stresses." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/49010.
Повний текст джерелаDong, Dong. "Ac-dc Bus-interface Bi-directional Converters in Renewable Energy Systems." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/28495.
Повний текст джерелаPh. D.
Demetriades, Georgios D. "On small-signal analysis and control of the single- and the dual-active bridge topologies." Doctoral thesis, Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-153.
Повний текст джерелаJain, Manu. "Bi-directional DC-DC converter for low-power applications." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0008/MQ39979.pdf.
Повний текст джерелаAbu-hamdeh, Muthanna S. "Modeling of Bi-directional Converter for Wind Power Generation." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1259684130.
Повний текст джерелаLi, Yiyang. "Novel power converter topologies to interface solar power to power grid with battery backup." Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/23269.
Повний текст джерелаPepper, Michael. "BI-DIRECTIONAL DCM DC-TO-DC CONVERTER FOR HYBRID ELECTRIC VEHICLES." Master's thesis, University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2672.
Повний текст джерелаM.S.E.E.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering MSEE
Fernando, W. Anand K. "Techniques for Designing HFAC Power Distribution Systems; Power Conversion and Distribution." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/17995.
Повний текст джерелаLuan, Austin J. "Bi-Directional Flyback DC-DC Converter for Battery System of the DC House Project." DigitalCommons@CalPoly, 2013. https://digitalcommons.calpoly.edu/theses/1012.
Повний текст джерелаWahid, Ferdus. "Analysis Of A Wave Power System With Passive And Active Rectification." Thesis, Uppsala universitet, Institutionen för elektroteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-425722.
Повний текст джерелаWu, Michael. "Improvements to a Bi-directional Flyback DC-DC Converter for Battery System of the DC House Project." DigitalCommons@CalPoly, 2014. https://digitalcommons.calpoly.edu/theses/1207.
Повний текст джерелаFan, Zaiming. "Investigation on smart bi-directional inverter with quantitative reactive power compensation and interleaved DC/DC converter for micro-grid system." Thesis, University of Cumbria, 2016. http://insight.cumbria.ac.uk/id/eprint/3326/.
Повний текст джерелаSabbarapu, Bharath Kumar. "DC-DC power converters with multiple outputs." Thesis, 2016. http://hdl.handle.net/1805/10998.
Повний текст джерелаThis study presents a novel converter configuration that is related to the area DC-DC power converters. To begin with, a brief introduction is given by stating the importance of power electronics. Different types of converters, their operating principles and several new topologies that are being proposed over the years, to suit a particular application with specific advantages are listed in detail. In addition, pro- cedure for performing small signal analysis, which is one among the several averaging techniques is summarized in the first chapter. In the second chapter, small signal modeling is carried out on the single input dual output DC-DC buck converter. This analysis is performed to get a clear un- derstanding on the dynamics of this novel configuration. Routh stability criterion is also applied on this converter topology to determine the limiting conditions for operating the converter in its stability. Third chapter proposes the single input multiple output DC-DC synchronous buck converter. It’s operation, implementation and design are studied in detail. In further, small signal analysis is performed on this topology to determine the transfer function. In the following chapter, results obtained on comparison of a losses between the conventional and traditional topologies are presented in detail. In addition, results achieved during the analysis performed in the previous chapter are displayed. In the end, advantages and its highlights of this novel configuration proposed in this study is summarized. Future course of actions to be done, in bringing this configuration in to practice are discussed as well.
Chang, Syu-Fong, and 張旭鋒. "Development of DSP-Based Bi-directional DC-DC Power Converters." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/z2rvew.
Повний текст джерела國立臺灣科技大學
電機工程系
94
This thesis presents the design and implementation of a digital signal processor based bi-directional dc-dc power converter for battery charge and discharge. When power converters operate at boost mode, the low-voltage side battery will discharge and provide power for dc-link; while at buck mode, the high-voltage side dc-link will charge the battery. The output voltage can be steady with voltage and current feedback control. The high-frequency transformer which uses two windings in parallel with power converter, together with the use of interleave control will split input current and raise the efficiency of conversion. In buck mode, the power switches are operated by phase-shifted control with soft switching and thereby reduce switching loss. The 16-bit digital signal processor, TMS320LF2407A, is used to implement the control function of the system. Experiments of 500W power converter are given. The terminal voltage range of battery is 20V~27V, and the dc-link voltage is 300V. The efficiency at full load of boost and buck modes are 88% and 92%, respectively.
李惇榮. "Development of Three-Phase Three-Level Dual Bi-directional Power Converters." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/71044004667411345856.
Повний текст джерела國立臺灣科技大學
電機工程系
92
This paper presents the analysis and implementation of a unity power factor, three-phase, three-level, dual bi-directional power converter for induction motor drives. In order to reduce current harmonic, the neutral-point-clamped power converter and power inverter are adopted to convert three-phase electrical power and to drive induction servo motor, respectively. Based on synchronous rotating-frame on the ac input side, the proposed ac-to-dc power converter is employed to improve power factor to unity and to reduce current harmonic as well. The dc-to-ac power inverter controlled by indirect rotor flux oriented algorithm is used to yield the rotor speed stably. In addition, the three-phase voltage command of power inverter is adjusted by voltage error between upper and lower capacitors at dc-link in order to decrease voltage imbalance between capacitors when rotor speeds up or down. With the instantaneous power balance control, the proposed system can not only convert three-phase electrical power from ac input, but also yield dc-link voltage stably. In order to reduce circuitry complexity, a low-cost, 16-bit digital signal processor (DSP TMS320LF2407A) is used to serve as the core control device to implement a 1.5kW drive system under 2.5kHz switching frequency. Experimental data show that power factor is improved to unity and total current harmonic distortion is around 3.6%, 6.6% at ac input side and induction motor, respectively. The efficiency of whole system reaches 86% and voltage error between upper and lower capacitors is approximate to zero under 2000rpm, 7.1N-m output. Besides, the regenerative power is sent back to the input side of power converter when motor is braking. Finally, simulation and experiment results are given to justify the proposed system performance.
Nimesh, V. "Dual Comparison One Cycle Control for Grid Connected Converters." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/4321.
Повний текст джерелаWu, Jhe-An, and 吳哲安. "Implementation of Bi-Directional 60Hz-400Hz Medium Frequency Power Converter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/87ntdy.
Повний текст джерела國立高雄應用科技大學
電機工程系博碩士班
103
The frequency of most AC power systems is 50Hz or 60Hz. However, 400Hz power systems are widely used in the aircraft, communications and vessels. If conventional converter input frequency and output frequency are not the same. You must use the AC-DC and DC-AC two-stage power converter to achieve frequency conversion function. If you can use a single-stage power converter and provide two different frequency AC power at the same time, it will improve the flexibility of application for power converter. This thesis develops a bi-directional 60Hz-400Hz medium frequency power converter, its circuit architecture consists of a single-stage power converter as a major converter, a DC port, 60Hz AC port and a 400Hz medium frequency port. The digital signal processor TMS320F28035PN is used to control the system. Finally, a hardware prototype will be developed and tested to verify the performance of the proposed 60Hz-400Hz medium frequency power converter.
Lin, Li-Wei, and 林立韋. "A Bi-directional DC/DC Converter for a Fuel Cell Power System." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/98778066388037724481.
Повний текст джерела中原大學
電機工程研究所
95
In recent years, growing concerns about environmental issues have demanded more clean energy sources such as fuel cells, wind turbines, and photovoltaic arrays. The rapid advances in fuel cell technology and power electronics have enabled the significant developments in fuel cell power system. The fuel cells have numerous advantages such as high density current output ability, clean electricity generation and high efficiency operation. However, the fuel cell characteristics are different from that of the traditional chemical-powered battery. The fuel cell output voltage drops quickly when first connected with a load and gradually decreases as the output current rises. The fuel cell also lacks energy storage capability. Therefore in power supply system applications, an auxiliary energy storage device (i.e. lead-acid battery) is always needed for a cold start and to absorb the regenerated energy fed back by the load. In addition, a bidirectional DC/DC converter is also needed to draw power from the auxiliary battery to boost the high-voltage bus during starting. The regenerated energy can be also fed back and stored in the battery using the DC/DC converter. In this dissertation, a high efficiency bidirectional isolated DC/DC converter for fuel cell power systems is studied. The new converter has the advantages of high efficiency, simple circuit and low cost. The detailed design and operation considerations are analyzed and described. Simulation results from the proposed circuit are given to verify the operation principles. A laboratory prototype is also implemented and tested to show its performance. Keywords: Clean energy source, Fuel cell power system, Bidirectional isolated dc-dc converter, Lead-acid battery
WEI, SI-XAING, and 韋思翔. "The Implementation of Bi-Directional Frequency Power Converter Based on Decoupling Technique." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/h4tb2k.
Повний текст джерела國立高雄應用科技大學
電機工程系博碩士班
106
The frequency of most AC power systems is 50Hz or 60Hz. However the 400Hz power systems are used in the communications, vessels and aircraft. If there is a frequency converter that can convert 400Hz voltage to 60Hz and 50Hz, or convert 60Hz or 50Hz voltage to 400Hz, it will improve the flexibility of 60Hz and 50Hz general power supplies and the convenience of using special power equipments with 400Hz voltage. This paper proposes a 60Hz-400Hz bi-directional frequency power converter based on decoupling technique. Through the decoupling technology, the function of bi-directional frequency conversion can achieve using only a single-stage power electronic converter. To verify the feasibility of the proposed 60Hz-400Hz bi-directional frequency power converter based on decoupling technique, a 60Hz-400Hz bi-directional frequency converter with the digital signal processor TMS320F28069 as controller was designed for experimental verification. The experimental results prove that the proposed frequency converter can achieve the expected performance.
Essakiappan, Somasundaram. "Bi-directional Current-fed Medium Frequency Transformer Isolated AC-DC Converter." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7743.
Повний текст джерелаHuang, Hong-jen, and 黃弘任. "Design of Bi-directional Power Converter Circuit under Electric Vehicle to Grid Concepts." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/30469915340062562029.
Повний текст джерела國立臺南大學
電機工程學系碩士班
101
Nowadays electric utilizes globally are heavily investing to upgrade their antiquated delivery, pricing, and service networks including investments in the advanced metering infrastructure which usually includes direct control and monitoring of devices and appliances inside customer premises. Therefore this thesis is aimed to develop a smart charger of electric vehicle with power converters and super-capacitor enhancement, hence anticipating reaching the rapid battery-charging speed and the bidirectional line interactive for further smart grid. The method proposed in this thesis is examined under various scenarios. The results will help consolidate the feasibility and practicability of the approach for the applications considered.
Lin, Wen-Tau, and 林文韜. "Study and Implementation of an Isolated High-power Bi-directional DC-DC Converter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/46448765906926673864.
Повний текст джерела國立臺灣科技大學
電子工程系
104
In this thesis, an isolated high-power bi-directional DC-DC converter is studied and implemented. The prototype circuit consists of two stages of bidirectional DC-DC converters. The stage attached to the battery-side is an interleaved buck/boost converter, and the stage of the grid-side is a three-phase series resonant converter. The battery-side stage consists of two buck / boost converters, so the load current can be shared by these two circuits. Consequently, it can reduce the stress of the switch elements. Besides, the switching control signals of the two converters have a phase-shifted of 180° each other, so it can effectively reduce the output current ripple. The grid-side stage mainly consists of three half-bridge legs i.e. there are six switches. There are three isolated transformers and three resonant tanks, the control signal for each leg has a phase-shift of 120° with each other. This converter stage is operated as a series resonant converter. The three isolated transformers are Y-connected on both the primary and secondary sides. Compared with conventional single-transformer full-bridge configuration, the developed scheme can share the output power with three transformers, and the size and cost of each transformer are thus reduced. In this thesis, a prototype circuit with 20 kW rated power has been built and tested. A digital-signal processor chip TMS320F28035 is used to realize the controller of this converter. The measured efficiencies are all higher than 90 % within the full range of load conditions.
Huang, Chun-Chieh, and 黃俊傑. "Design of High Power Bi-directional DC-DC Converter Module for Electric Ships." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/y7qfbs.
Повний текст джерела國立臺灣科技大學
電子工程系
105
In this thesis, a high power bi-directional DC-DC converter module for electric ships is studied and implemented, to be used for energy conversion between battery and DC bus. The module consists of two-stage circuits: a bi-directional buck/boost converter at battery side and a full-bridge series resonant converter at DC bus side. The developed bi-directional DC-DC converter module can be applied to the electric ship power system for charging/ discharging between battery and DC bus and adjusting bidirectional power transfer. In addition to establish a bi-directional DC-DC converter module and to discuss the bi-directional buck/boost converter and the full-bridge series resonant converter, the design criterions have been found. A 15 kW prototype module with circuit specifications of 400 V to 750 V input and output voltages was implemented and tested. A digital signal processor TMS320F28035 is used to realize the digital controller. According to the experimental results, the overall conversion efficiency can be up to 93%.
Yang, Chung-Kuang, and 楊鎮光. "Design and Implementation of a CLLC Resonant Converter with Bi-Directional Power Flow." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/hytec2.
Повний текст джерела國立臺北科技大學
電機工程系
106
This paper is aimed to design and implement a CLLC resonant DC-DC converter with bi-directional power flow control, which is installed in front end of energy storage system (ESS) to act as energy buffer for load. The CLLC will provide extra power from ESS to load side when the load needed transient power. In contrast, the CLLC will store the regenerated energy from load side to ESS. Therefore, the pulsating energy yielded by transient load can be reduced through CLLC. Hence, not only the current stress of the front-end AC-DC converter or rectifier but also the risk of grid’s overload are effectively decreased. Due to the need of suppling transient power, the CLLC should provide the capability of fast current control. In addition, the CLLC can reach ZCS to enhance efficiency of the constructed ESS with adequate design under charging mode. Finally, a DSP (TMS320F28075)-based controller is used to constructed an 1kW/400V/48V bi-directional power flow converter as test platform to verify the effectiveness of proposed system.
Wang, Chao-Fu, and 王釗桴. "Study and Implement of a High Power Isolated Bi-directional Three-Phase DC-DC Converter." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/99138964430424519419.
Повний текст джерела國立臺灣科技大學
電子工程系
102
This dissertation presents a isolated bi-directional DC-DC converter can be applied in power generation system and battery array testing system. The topology of this converter is a three-phase full-bridge type, that is mainly consists of three half-bridge switch legs (six switches), three isolated transformers, three half-bridge synchronous rectification switch legs and inductor. The three isolated transformers are configured in Y-Δ connection with series high-voltage side and parallel low-voltage side, it can reduce the turns of Y side and the winding current stress of Δ side by current sharing, besides, Y-Δ connection has high voltage transfer ratio. Comparing with the general single-transformer full-bridge type (four switches), it can share output power by three transformers, the size and cost of each transformer are thus reduced. Asymmetrical control scheme is used for driving the power switches, so that the zero-voltage-switching can be achieved. In this dissertation, a laboratory prototype with 11-kW rated power has been built and tested. The voltage of low-voltage side is 45 V and current is 240 A. A digital-signal processor chip TMS320F28035 is used to realize the controller of this converter. The measured efficiencies are above 90% form 20% to 100% load conditions.
Wu, Jia Ying, and 吳佳穎. "Design and Implementation of High Power Bi-directional Three-Phase Four-Wire Half-bridge Converter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/19471699644576233226.
Повний текст джерела國立清華大學
電機工程學系
103
This thesis presents a high power bi-directional three-phase four-wire half bridge converter for charger/discharger systems, including grid-connection mode, rectification mode and dc-bus voltage regulation mode. In grid-connection mode, power is transferred from DC to AC and injected into the utility grid. In rectification mode, the utility power is transformed to DC with power factor correction. In dc-bus voltage regulation mode, the converter can inject power into the utility grid or supply DC loads when the bus voltage is higher than the setpoint. On the contrary, it will regulate the voltage by operating at rectification mode. A single-chip microcontroller Renesas RX62T is adopted to realize the control algorithm. In the thesis, component selection, including IGBT modules and design of inductors is first presented. Next, control law and operation principle of the converter with division-summation (D- ) digital control are addressed. Additionally, the converter in grid-connection mode and rectification mode with the D- digital control is simulated. Due to the DC bus constructed with capacitors in series, capacitor voltage balancing algorithm is also proposed. Finally, the converter has been implemented and tested so as simulated and measured results can verify the control scheme and feasibility. The major contributions of this research can be summarized as follows: First, the derived control law can accommodate grid voltage and inductance variations. The microcontroller RX62T is adopted to calculate the duty ratio exactly which can avoid output current distortion when inductance varies over a wide range. Secondly, the proposed operation does not yield high frequency common mode voltage so as it can be applied to PV inverter system. Thirdly, the converter has a property of multi-functions which can not only reduce production cost and volume, but can execute different operation modes according to load demands.
Lin, Yun-tung, and 林芸彤. "A Triple-Winding High Step-up/down Bi-directional Converter for Green-energy Power System." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/02205859442345471153.
Повний текст джерела國立高雄第一科技大學
電子工程系碩士在職專班
103
The aim of this thesis is to present a converter, which can achieve high voltage gain, reduce cost, and promote efficiency. It has the intrinsic features of leakage energy recycling and zero-voltage switching. The presented converter consists of a boost converter, a buck-boost converter, and a high frequency transformer. As compared to traditional bi-directional DC-DC converters, fewer power active components, lower cost, easier control design are its advantages. Under the same conditions of turns ratio and duty ratio, higher voltage gain can be accomplished. To improve conversion efficiency, the energy stored in the leakage inductance of the transformer can be totally recycled. In the thesis, theoretical analysis, detailed derivation, and operation principle are conducted. The feasibility of the presented converter has been verified through hardware implementation.
Siao, Kun-Cheng, and 蕭琨澄. "Single-phase Bi-directional AC/DC Converter with Power Factor Correction and Phase-Locked Loop." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/14660587232864353104.
Повний текст джерела國立中山大學
電機工程學系研究所
102
With the development of smart grids, more and more Distributed Generation Systems (DGSs) and Renewable Energy Generation Systems (REGSs) will be interconnected to power grids in the foreseeing future. Most of DGSs and REGSs are DC power sources; therefore, power inverters are used to convert DC power of DGSs and REGSs to AC powers and to interconnect to power grids. In addition, most of REGSs are unstable power sources; they require Energy Storage Systems (ESSs) to stabilize output power. The ESSs can be charged by the REGSs and by power grids if necessary, so the design and development of a bi-directional AC/DC converter is necessary. This thesis develops and implements a single-phase bi-directional AC/DC converter with power factor correction and phase-locked loop. A fully digital controller for the implemented 1kW bi-directional AC/DC converter is designed by Microchip dsPIC33FJj16GS504. Experimental results show that the proposed single-phase bi-directional AC/DC converter can not only has rated power of 1kW but also achieve power factor correction and phase-locked loop.
Liao, Chang-Hung, and 廖長鴻. "Design and Implementation of a Bi-directional Full-Bridge DC-DC Converter for High Power Application." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/u42baf.
Повний текст джерела國立臺北科技大學
電力電子產業研發碩士專班
98
This thesis is aimed to design a bi-directional full-bridge DC-DC converter for high power application, its buck and boost mode are implemented through phase-shift full-bridge and current-fed full-bridge circuit structure. To overcome the power limitation of high-frequency transformer, therefore multiple transformers connected in parallel are carried out to increase output power. A careful components placement and layout of power circuit are proposed to guarantee well current sharing among paralleled transformers and less leakage inductance. The proposed controller consists of voltage and current regulator in cascade to achieve constant-voltage and constant-current control. In order to facilitate the studies performed in this thesis, a DSP-based converter with necessary peripherals is established to provide 400V input and 10kW/310V output. All the control algorithms are implemented by assembly language to shorten the execution time, and hence the carrier frequency can be increased to reduce the converter volume. After establishing the converter, some measured results are provided to show its successful operation and effectiveness.
Yeh, Yu-Ting, and 葉昱廷. "A Single-phase DC-AC Converter with High Dynamic Response and Bi-directional Power Flow Control." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/4sfwp7.
Повний текст джерела國立臺北科技大學
電機工程系研究所
99
This paper is aimed to design a single-phase DC- AC converter with bi-directional power flow control. The converter is implemented by a full-bridge circuit with bipolar PWM control to act as grid-connected inverter or provide transient current to non-linear load to reduce AC voltage harmonics. A power device with both motoring and generating mode is connected to DC link and controls power flow between power device in DC-side and power grid in AC-side of the proposed DC-AC converter according to DC link voltage. The converter becomes DC-AC converter and sends the energy generated by the power device to electric grid when the DC-link voltage is higher than default voltage command. As the DC link voltage is less than default voltage command, the proposed converter withdraws power from electric grid to the power device. Meanwhile, the converter also provides near unity power factor control for electric grid in the bi-directional power flow control. In order to enhance light-load efficiency of the proposed converter when send the energy to electric grid, an integral-cycles injection of current is developed. When the generated power is less than a preset value, the energy will be stored in the electrolytic capacitance installed in the DC link and all the power switches of full-bridge circuit are turned off. In the need of high dynamic response for AC power supply with line frequency transformer as isolated output, the AC-side of the proposed converter is connected to output of the line-frequency transformer. The converter co-works with the AC power supply and provides extra transient current, which is determined by the difference between AC voltage command and actual voltage of load, for the nonlinear loads to compensate the voltage distortion. Therefore, output voltage harmonics of the AC power supply can be reduced dramatically to meet the requirement of regulations. A single-phase full-bridge DC-AC converter controlled by a DSP-TMS320F28035 with 110V/1 kW is constructed. To realize the digital power control, all the controlling strategies are written by software. Some experimental results are provided to show its efficiency.
Δημητρακάκης, Στέφανος. "Ανάπτυξη δυναμικού μοντέλου και έλεγχος ανεμογεννήτριας συνδεδεμένης στο δίκτυο και σε αυτόνομη λειτουργία εφοδιασμένη με διάταξη αποθήκευσης ενέργειας". Thesis, 2014. http://hdl.handle.net/10889/7831.
Повний текст джерелаIn this thesis, a wind energy conversion system (WECS) based on a permanent magnet synchronous generator (PMSG) was studied and simulated. All parts of the WECS are presented and discussed in detail. Furthermore, control strategies for the generator-side converter and the voltage source inverter are developed. The WECS is simulated both in grid connected and stand-alone mode. In the stand-alone mode, the WECS is supplied with an energy storage system for which a bi-directional buck/boost converter and control strategy was designed. Finally, simulation results are presented and performance of the system in various modes of operation is evaluated. Simulink/Matlab is used for modeling and simulating the WECS. At the beginning of Chapter 1, a discussion of energy crisis and renewable energy sources is held. Furthermore, information about wind energy has been reviewed and its benefits and drawbacks are examined. In addition, the structure of a wind turbine and the principles of converting wind energy into electricity are presented. In Chapter 2 all parts of the wind turbine are studied and its characteristics are specified. Even more, the model of every part in Simulink is presented. Theoretical background, structure and operation principles of PMSG are presented in detail. In Chapter 3, firstly a general presentation of converters components takes place. Then the major existing categories of converter are presented and some basic types of converters, which are generally used in WECS, are mentioned. Moreover, the chapter focuses on the converters that are used in this thesis, explaining the way they operate. After all, their models in Simulink are shown. Emphasis was given to the dc/dc boost converter whose parameters are calculated and its operation is simulated. Finally, there is a presentation of the filter which was placed at the output of the inverter. In Chapter 4, Pulse-width Modulation (PWM) and Sinusoidal Pulse-width Modulation (SPWM) techniques that are used in this thesis are described. Moreover, the control strategy for the generator-side converter with maximum power extraction is presented. The control strategy of the voltage sourced inverter is shown as well. In Chapter 5 simulation results of the grid connected WECS are presented and evaluated. On the first part of the presentation, the WECS is simulated for constant wind speed (12m/s), and in the second part for step-changed wind speed. In Chapter 6 the stand-alone operation of the WECS is studied and supplied with an energy storage system. Initially, there is an analysis of the energy storage system, which was used, and in particular the battery bank, whose characteristics are given. Moreover, a Bi-directional dc/dc Buck-Boost converter which is used to interconnect the battery bank to the dc-link is presented and modeled. Afterwards, there is a detailed description of the control strategy used in order to control charging / discharging of the battery bank. At the end of this chapter, simulation results of two different stand-alone operation modes are presented, one with constant wind speed and variable load and the other one with step-changing wind speed and constant load.
Moshirvaziri, Mazhar. "Ultracapacitor/Battery Hybrid Energy Storage Systems for Electric Vehicles." Thesis, 2012. http://hdl.handle.net/1807/33458.
Повний текст джерела