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Soft switching ac-link three-phase ac–ac buck–boost converter

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Final Year IEEE Projects for BE, B.Tech, ME, M.Tech,M.Sc, MCA & Diploma Students latest Java, .Net, Matlab, NS2, Android, Embedded,Mechanical, Robtics, VLSI, Power Electronics, IEEE projects are given absolutely complete working product and document providing with real time Software & Embedded training......
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Soft switching ac-link three-phase ac–ac buck–boost converter

  1. 1. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT SOFT-SWITCHING AC-LINK THREE-PHASE AC-AC BUCK–BOOST CONVERTER By A PROJECT REPORT Submitted to the Department of electronics & communication Engineering in the FACULTY OF ENGINEERING & TECHNOLOGY In partial fulfillment of the requirements for the award of the degree Of MASTER OF TECHNOLOGY IN ELECTRONICS & COMMUNICATION ENGINEERING APRIL 2016
  2. 2. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT CERTIFICATE Certified that this project report titled “SOFT-SWITCHING AC-LINK THREE-PHASE AC- AC BUCK–BOOST CONVERTER” is the bonafide work of Mr. _____________Who carried out the research under my supervision Certified further, that to the best of my knowledge the work reported herein does not form part of any other project report or dissertation on the basis of which a degree or award was conferred on an earlier occasion on this or any other candidate. Signature of the Guide Signature of the H.O.D Name Name
  3. 3. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT DECLARATION I hereby declare that the project work entitled “SOFT-SWITCHING AC-LINK THREE- PHASE AC-AC BUCK–BOOST CONVERTER” Submitted to BHARATHIDASAN UNIVERSITY in partial fulfillment of the requirement for the award of the Degree of MASTER OF APPLIED ELECTRONICS is a record of original work done by me the guidance of Prof.A.Vinayagam M.Sc., M.Phil., M.E., to the best of my knowledge, the work reported here is not a part of any other thesis or work on the basis of which a degree or award was conferred on an earlier occasion to me or any other candidate. (Student Name) (Reg.No) Place: Date:
  4. 4. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT ACKNOWLEDGEMENT I am extremely glad to present my project “SOFT-SWITCHING AC-LINK THREE-PHASE AC-AC BUCK–BOOST CONVERTER” which is a part of my curriculum of third semester Master of Science in Computer science. I take this opportunity to express my sincere gratitude to those who helped me in bringing out this project work. I would like to express my Director, Dr. K. ANANDAN, M.A.(Eco.), M.Ed., M.Phil.,(Edn.), PGDCA., CGT., M.A.(Psy.) of who had given me an opportunity to undertake this project. I am highly indebted to Co-Ordinator Prof. Muniappan Department of Physics and thank from my deep heart for her valuable comments I received through my project. I wish to express my deep sense of gratitude to my guide Prof. A.Vinayagam M.Sc., M.Phil., M.E., for her immense help and encouragement for successful completion of this project. I also express my sincere thanks to the all the staff members of Computer science for their kind advice. And last, but not the least, I express my deep gratitude to my parents and friends for their encouragement and support throughout the project.
  5. 5. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT ABSTRACT: In this paper, the soft-switching ac-link ac–ac buck–boost converter will be studied in more detail. This single-stage converter, which is, in essence, an extension of the dc–dc buck– boost converter, can be an excellent alternative to dc-link converters. Being a buck–boost converter, this converter is capable of both stepping-up and stepping-down the voltage. The link current and voltage are both alternating, and their frequency can be as high as permitted by the switches and the sampling time of the microcontroller. This eliminates the need for dc inductors or dc electrolytic capacitors, and the main energy storage element is an ac inductor (L). Moreover, in this converter, galvanic isolation can be provided by adding a single-phase high- frequency transformer to the link. Therefore, the proposed converter is expected to be more compact compared to the conventional dc-link converter. The other advantage of this converter is the soft switching of the switches, which is feasible by adding a small capacitor (C) to the link
  6. 6. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT INTRODUCTION: Different types of ac–ac converters have been proposed over the years. These converters can be classified as direct or indirect depending on their power conversion type. Matrix converters and cyclo converters are examples of the direct ac–ac converters, whereas the dc-link and ac-link converters are classified as indirect ac–ac converters. Cyclo converters and matrix converters have several limitations that hinder their widespread use in industry. Among these limitations are the poor input displacement, low input power factor (PF), and limited output frequency in the cyclo converters, and the low output to input voltage ratio in the matrix converters. The dc-link converters are the most common type of ac–ac converters. This type of converters is formed by a three-phase boost rectifier and a three-phase buck inverter. Regardless of the type of the rectifier or the inverter, dc electrolytic capacitors are integral part of these converters. Electrolytic capacitors are very sensitive to temperature and can cause severe reliability problems at higher temperatures. Therefore, converters that contain dc electrolytic capacitors have higher failure rates and shorter lifetimes compared to the other converters. This is not the only problem with dc-link converters. In these converters, galvanic isolation can be provided by three-phase low-frequency transformers. Therefore, another limitation of the dc-link converters is the large size and the heavy weight of the low-frequency transformers employed
  7. 7. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT EXISTING SYSTEM: A new zero voltage switching partial-resonant link AC/AC converter which overcomes most of the aforementioned disadvantages and consists of 12 unidirectional switches is proposed. The converter synthesizes output ac waveforms by integrating high-frequency current pulses like series-resonant converters. But switching transients does not occur at zero current instants but at zero voltage instants. The partial-resonant link normally does not resonate during entire operation interval but operates only during the switching transients to ensure zero voltage switching condition. Thus this converter has low VAR ratings of resonant elements L, and C, and has low dissipations. In particular, the converter can control individual current pulse amplitude very easily in each switching cycle, which enables improving the output voltage waveform and solving the instability problem usually caused by parasitic resonance between output capacitor CO and load inductance Lo. Symmetrical arrangement of power circuit in the converter also provides fully regenerative operation together with buck-boost capability.
  8. 8. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT PROPOSED SYSTEM: In this paper, a soft-switching ac-link ac–ac buck–boost converter is introduced, studied, analyzed, and evaluated. In this converter, the link current and voltage are both alternating, and their frequency can be very high. This eliminates the need for the dc electrolytic capacitors and the low-frequency transformers. In case galvanic isolation is required, a single-phase high frequency transformer may be added to the link. By adding a small capacitor to the link, the converter can provide soft switching as well. This converter transfers power entirely through the link inductor. The link is charged through the input phase pairs and then discharged into the output phase pairs. Charging and discharging take place alternately. The frequency of charge/discharge is called the link frequency and is typically much higher than the input/output line frequencies. Between each charging and discharging, there is a resonating mode during which none of the switches conduct and the LC link resonates to facilitate the zero voltage turn- on and the soft turn-off of the switches. Due to the existence of the bidirectional switches, charging and discharging of the link in a reverse direction is feasible, leading to an alternating link current.
  9. 9. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT ADVANTAGES:  Better utilization of the inductor.
  10. 10. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT BLOCK DIAGRAM:
  11. 11. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT TOOLS AND SOFTWARE USED:  MPLAB – microcontroller programming.  ORCAD – circuit layout.  MATLAB/Simulink – Simulation
  12. 12. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT APPLICATIONS:  Wind power generation and variable-speed drives
  13. 13. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT CONCLUSION: This paper has presented the detailed design and analysis of the soft-switching ac-link ac–ac buck–boost converter. The performance of the converter at low power levels, when the resonance of the link is not negligible, was studied, and a method was proposed for calculating the link peak current and the link frequency at these power levels. It was shown that the link peak current decreases by decreasing the power level, whereas the link frequency increases by decreasing the power level. This converter is expected to be an excellent alternative to the conventional dc-link converters. In this paper, the current ratings of the switches and the efficiencies of the two converters have been compared. The proposed converter requires more switches, but the average current of each switch in this converter is half the average current of the switches in the dc-link converter. Depending on the switching characteristics and the switching frequency in the dc-link converter, the efficiency of this converter may be higher or lower than that of the proposed converter. Clearly, if reverse blocking IGBTs are used, the efficiency of the proposed converter increases significantly
  14. 14. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT REFERENCES: [1] J. Rodriguez, S. Bernet, W. Bin, J. O. Pontt, and S. Kouro, “Multilevel voltage-source- converter topologies for industrial medium-voltage drives,” IEEE Trans. Ind. Electron., vol. 54, no. 6, pp. 2930–2945, Dec. 2007. [2] W. Bin, J. O. Pontt, J. Rodriguez, S. Bernet, and S. Kouro, “Currentsource converter and cycloconverter topologies for industrial mediumvoltagendrives,” IEEE Trans. Ind. Electron., vol. 55, no. 7, pp. 2786–2797, Jul. 2008. [3] F. L. Luo and Y. Hong, Power Electronics: Advanced Conversion Technologies. Boca Raton, FL, USA: CRC Press, 2010. [4] J.W. Kolar, T. Friedli, J. Rodriguez, and P.W.Wheeler, “Review of threephase PWM ac–ac converter topologies,” IEEE Trans. Ind. Electron., vol. 58, no. 11, pp. 4988–5006, Nov. 2011. [5] S. Chakraborty, B. Kramer, and B. Kroposki, “A review of power electronics interfaces for distributed energy systems toward achieving low-cost modular design,” Renew. Sust. Energ. Rev., vol. 13, no. 9, pp. 2323–2335, Dec. 2009.

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