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A single phase cascaded multilevel inverter based on a new basic unit with reduced number of power switches

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A single phase cascaded multilevel inverter based on a new basic unit with reduced number of power switches

  1. 1. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMB ATORE / 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 A SINGLE-PHASE CASCADED MULTILEVEL INVERTER BASED ON A NEW BASIC UNIT WITH REDUCED NUMBER OF POWER SWITCHES 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 / COIMB ATORE / 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 “A SINGLE-PHASE CASCADED MULTILEVEL INVERTER BASED ON A NEW BASIC UNIT WITH REDUCED NUMBER OF POWER SWITCHES” 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 / COIMB ATORE / 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 “A SINGLE-PHASE CASCADED MULTILEVEL INVERTER BASED ON A NEW BASIC UNIT WITH REDUCED NUMBER OF POWER SWITCHES” 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 / COIMB ATORE / 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 “A SINGLE-PHASE CASCADED MULTILEVEL INVERTER BASED ON A NEW BASIC UNIT WITH REDUCED NUMBER OF POWER SWITCHES” 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 / COIMB ATORE / 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, a new single-phase cascaded multilevel inverter is proposed. This inverter is comprised of a series connection of the proposed basic unit and is able to only generate positive levels at the output. Therefore, an H-bridge is added to the proposed inverter. This inverter is called the developed cascaded multilevel inverter. In order to generate all voltage levels (even and odd) at the output, four different algorithms are proposed to determine the magnitude of dc voltage sources. Reduction in the number of power switches, driver circuits, and dc voltage sources is the advantage of the developed single-phase cascaded multilevel inverter. As a result, the installation space and cost of the inverter are reduced. These features are obtained by the comparison of the conventional cascaded multilevel inverters with the proposed cascaded topology. The ability of the proposed inverter to generate all voltage levels (even and odd) is reconfirmed by using the experimental results of a 15-level inverter.
  6. 6. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMB ATORE / 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: The demand for high-voltage high-power inverters is increasing, and it is impossible to connect a power semiconductor switch to a high-voltage network directly. Therefore, multilevel inverters had been introduced and are being developed now. With an increasing number of dc voltage sources in the input side, a sinusoidal like waveform can be generated at the output. As a result, the total harmonic distortion (THD) decreases, and the output waveform quality increases, which are the two main advantages of multilevel inverters. In addition, lower switching losses, lower voltage stress of dv/dt on switches, and better electromagnetic interference are the other most important advantages of multilevel inverters. These kinds of inverters are generally divided into three main categories, i.e., neutral- point-clamped multilevel inverters, flying capacitor multilevel inverters, and cascaded multilevel inverters. There is no diode clamped or flying capacitors in cascaded multilevel inverters. Moreover, these inverters consist of modularity, simplicity of control, and reliability, and they require the lowest number of power semiconductor devices to generate a particular level. As a result, the losses and total cost of these inverters decrease, and the efficiency will increase . These inverters are comprised of a series connection of basic units, which consist of different arrays of power switches and dc voltage sources. Generally, these inverters are divided into two main groups, i.e., symmetric cascaded multilevel inverters with the same amplitude of dc voltage sources and asymmetric cascaded multilevel inverters.
  7. 7. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMB ATORE / 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 The asymmetric cascaded multilevel inverters generate a higher number of output levels in comparison with the symmetric cascaded multilevel inverters with the same number of power electronic devices because of the different amplitude of its dc voltage sources. As a result, the installation space and total cost of an asymmetric cascaded multilevel inverter is lower than that of a symmetric cascaded multilevel inverter Up to now, different basic units and, thus, different cascaded multilevel inverters have been presented in literature. In , different symmetric cascaded multilevel inverters have been presented. Another topology with two different algorithms as symmetric and asymmetric inverters have been also presented .The main disadvantages of the symmetric inverters are the high required numbers of power switches,
  8. 8. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMB ATORE / 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 cascaded H-bridges multilevel inverter is simply a series connection of multiple Hbridge inverters. Each H-bridge inverter has the same configuration as a typical single-phase full-bridge inverter. The cascaded H-bridges multilevel inverter introduces the idea of using Separate DC Sources (SDCSs) to produce an AC voltage waveform. Each H-bridge inverter is connected to its own DC source Vdc. By cascading the AC outputs of each H-bridge inverter, an AC voltage waveform is produced. By closing the appropriate switches, each H-bridge inverter can produce three different voltages: +Vdc, 0 and -Vdc. It is also possible to modularize circuit layout and packaging because each level has the same structure, and there are no extra clamping diodes or voltage balancing capacitors.
  9. 9. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMB ATORE / 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 order to increase the number of generated output levels by using a lower number of power electronic devices, a new basic unit is proposed in this paper. By a series connection of several proposed basic units, a new cascaded multilevel inverter is proposed. Then, to generate all positive and negative levels at the output, an H-bridge will be added to this inverter because the proposed inverter only generates positive levels. This inverter is called the developed proposed cascaded multilevel inverter. In order to generate all voltage levels at the output, four different algorithms are proposed
  10. 10. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMB ATORE / 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:  Requires the minimum number of power switches, IGBTs, power diodes, driver circuits, and dc voltage sources.  Reduction in the installation space and total cost of the inverter
  11. 11. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMB ATORE / 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: INPUT DC SUPPLY UNIT1 5V DC 12V DC OPTOISOLATOR CIRCUIT PICCONTROLLER WITH BUFFER UNI DIRECTIONAL SWITCHING CIRCUIT UNIT 1 INPUT DC SUPPLY UNIT2 UNI DIRECTIONAL SWITCHING CIRCUIT UNIT 2 INPUT DC SUPPLY UNIT3 UNI DIRECTIONAL SWITCHING CIRCUIT UNIT 3 DRIVER CIRCUIT 12V DC
  12. 12. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMB ATORE / 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
  13. 13. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMB ATORE / 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:  AC drives  Static VAR compensation
  14. 14. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMB ATORE / 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: In this paper, a new basic unit for a cascaded multilevel inverter is proposed. By the series connection of several basic units, a cascaded multilevel inverter that only generatespositive levels at the output is proposed. Therefore, an H-bridge is added to the proposed inverter to generate all voltage levels. This inverter is called the developed cascaded multilevel inverter. In order to generate even and odd voltage levels at the output, four different algorithms are proposed to determine the magnitude of the dc voltage sources. Then, several comparisons are done between the developed proposed single-phase cascaded inverter and its proposed algorithms with cascaded multilevel inverters that have been proposed in literature. According to these comparisons, the developed proposed cascaded topology requires less numbers of IGBTs, power diodes, driver circuits, and dc voltage sources than other presented cascaded topologies in literature
  15. 15. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMB ATORE / 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] E. Babaei, S. Alilu, and S. Laali, “A new general topology for cascaded multilevel inverters with reduced number of components based on developed H-bridge,” IEEE Trans. Ind. Electron., vol. 61, no. 8, pp. 3932–3939, Aug. 2014. [2] M. F. Kangarlu and E. Babaei, “A generalized cascaded multilevel inverter using series connection of sub-multilevel inverters,” IEEE Trans. Power Electron., vol. 28, no. 2, pp. 625– 636, Feb. 2013. [3] J. H. Kim, S. K. Sul, and P. N. Enjeti, “A carrier-based PWM method with optimum switching sequence for a multilevel four-leg voltagesource inverter,” IEEE Trans. Ind. Appl., vol. 44, no. 4, pp. 1239–1248, Jul./Aug. 2008. [4] O. Lopez et al., “Comparison of a FPGA implementation of two multilevel space vector PWM algorithms,” IEEE Trans. Ind. Electron., vol. 55, no. 4, pp. 1537–1547, Apr. 2008. [5] E. Babaei and S. Sheermohammadzadeh, “Hybrid multilevel inverter using switched- capacitor units,” IEEE Trans. Ind. Electron., vol. 61, no. 9, pp. 4614–4621, Sep. 2014.

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