Grid Interconnecting Solar Generation System Using Transformer Less Cascaded Seven Level Inverter

Authors(1) :-Naveen Kokku

Multilevel inverter is a power electronic device that is used for high voltage and high power applications and has many advantages like, low switching stress, low total harmonic distortion (THD). Hence, the size and bulkiness of passive filters can be reduced. This paper proposes three topologies of a 7- level cascaded multilevel inverter with reduced number of switches with the 5-level cascaded multilevel inverter and 3-level inverter. The topologies consist of circuits with 9 switches for 7-level CMLI, 8 switches for the 5-level CMLI and 6 switches for the 3-level inverter. Apart from the reduction in switch count this paper also includes minimization of leakage currents and comparative analysis of levels of CMLI

Authors and Affiliations

Naveen Kokku
M.Tech, Electrical and Electronics Engineering (PAID), JNTUA college of Engineering, Ananthapur, Andhra Pradesh, India

WM (Pulse Width Modulation).Total Harmonic Distortion (THD)

  1. Prof. Y Tang, W. Yao, P.C. Loh and F. Blaabjerg, "Highly Reliable Transformerless Photovoltaic Inverters With Leakage Current and Pulsating Power Elimination," IEEE Trans. Ind. Elect., vol. 63, no. 2, pp. 1016-1026, Feb. 2016.
  2. W Li, Y. Gu, H. Luo, W. Cui, X. He and C. Xia, "Topology Review and Derivation Methodology of Single-Phase Transformerless Photovoltaic Inverters for Leakage Current Suppression," IEEE Trans. Ind. Elect., vol. 62, no. 7, pp. 4537-4551, July 2015.
  3. J Ji, W. Wu, Y. He, Z. Lin, F. Blaabjerg and H. S. H. Chung, "A Simple Differential Mode EMI Suppressor for the LLCL-Filter-Based Single-Phase Grid-Tied Transformerless Inverter," IEEE Trans. Ind. Elect., vol. 62, no. 7, pp. 4141-4147, July 2015.
  4. Y Bae and R.Y.Kim, "Suppression of Common-Mode Voltage Using a Multicentral Photovoltaic Inverter Topology With Synchronized PWM," IEEE Trans. Ind. Elect., vol. 61, no. 9, pp. 4722-4733, Sept. 2014.
  5. N Vazquez, M. Rosas, C. Hernandez, E. Vazquez and F. J. Perez-Pinal, "A New Common-Mode Transformerless Photovoltaic Inverter," IEEE Trans. Ind. Elect., vol. 62, no. 10, pp. 6381-6391, Oct. 2015.
  6. G Buticchi, E. Lorenzani and G. Franceschini, "A Five-Level Single-Phase Grid-Connected Converter for Renewable Distributed Systems," IEEE Trans. Ind. Elect., vol.60, no.3, pp.906-918, March 2013.
  7. NA. Rahim and J. Selvaraj, "Multistring Five-Level Inverter With Novel PWM Control Scheme for PV Application," IEEE Trans. Ind. Elect., vol.57, no.6, pp.2111-2123, June 2010.
  8. M Cavalcanti, K. De Oliveira, A. M. de Farias, F. Neves, G. Azevedo and F. Camboim, "Modulation Techniques to Eliminate Leakage Currents in Transformerless Three-Phase Photovoltaic Systems," IEEE Trans. Ind. Elect., vol. 57, no. 4, pp. 1360-1368, April 2010.
  9. L Zhang, K. Sun, L. Feng, H. Wu and Y. Xing, "A Family of Neutral Point Clamped Full-Bridge Topologies for Transformerless Photovoltaic Grid-Tied Inverters," IEEE Trans. Power Elect., vol.28, no.2, pp.730-739, Feb. 2013.
  10. M. Islam and S. Mekhilef, "H6-type transformerless single-phase inverter for grid-tied photovoltaic system," IET Elect. Power Elect., vol.8, no.4, pp.636-644, 2015.
  11. H.F. Xiao, K. Lan and L. Zhang, "A Quasi-Unipolar SPWM Full-Bridge Transformerless PV Grid-Connected Inverter with Constant Common-Mode Voltage," IEEE Trans. Power Elect., vol.30, no.6, pp.3122-3132, June 2015.
  12. B.Ji, J. Wang and J. Zhao, "High-Efficiency Single-Phase Transformerless PV H6 Inverter With Hybrid Modulation Method," IEEE Trans. Ind. Elect., vol.60, no.5, pp.2104-2115, May 2013.
  13. G. Buticchi, D. Barater, E. Lorenzani, C. Concari and G. Franceschini, "A Nine-Level Grid-Connected Converter Topology for Single-Phase Transformerless PV Systems," IEEE Trans. Ind. Elect., vol.61, no.8, pp.3951-3960, Aug. 2014.
  14. F. Hong, J. Liu, B. Ji, Y. Zhou, J. Wang and C. Wang, "Single Inductor Dual Buck Full-Bridge Inverter," IEEE Trans. Ind. Elect., vol.62, no.8, pp.4869-4877, Aug. 2015.
  15. S. V. Araujo, P. Zacharias and R. Mallwitz, "Highly Efficient Single-Phase Transformerless Inverters for Grid-Connected Photovoltaic Systems," IEEE Trans. Ind. Elect., vol. 57, no. 9, pp. 3118-3128, Sept. 2010.
  16. O. Lopez, R. Teodorescu and J. D. Gandoy, "Multilevel transformerless topologies for single-phase grid-connected converters," APEC 2006, pp.5191-5196, Nov. 2006.
  17. O. Lopez, R. Teodorescu, F. Freijedo and J.D. Gandoy, "Leakage current evaluation of a single-phase Transformerless PV inverter connected to the grid," APEC 2007, pp.907-912, March 2007.
  18. O. Lopez, F.D. Freijedo, A.G. Yepes, P. F. Comesaa, J. Malvar, R. Teodorescu and J. D. Gandoy, "Eliminating Ground Current in a Transformerless Photovoltaic Application," IEEE Trans. Energy Conv., vol.25, no.1, pp.140-147, March 2010.
  19. G. Vazquez, P.R.M. Rodriguez, G. Escobar, J.M. Sosa and R.M. Mendez, "A PWM method for single-phase cascade multilevel inverters to reduce leakage ground current in transformerless PV systems," (accepted for publication in International Transactions on Electrical Energy Systems, Wiley Publications).

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Publication Details

Published in : Volume 6 | Issue 1 | January-February 2019
Date of Publication : 2019-02-28
License:  This work is licensed under a Creative Commons Attribution 4.0 International License.
Page(s) : 235-245
Manuscript Number : IJSRST196132
Publisher : Technoscience Academy

Print ISSN : 2395-6011, Online ISSN : 2395-602X

Cite This Article :

Naveen Kokku, " Grid Interconnecting Solar Generation System Using Transformer Less Cascaded Seven Level Inverter", International Journal of Scientific Research in Science and Technology(IJSRST), Print ISSN : 2395-6011, Online ISSN : 2395-602X, Volume 6, Issue 1, pp.235-245, January-February-2019. Available at doi : https://doi.org/10.32628/IJSRST196132    
Journal URL : https://ijsrst.com/IJSRST196132
Citation Detection and Elimination     |      | |
  • W Li, Y. Gu, H. Luo, W. Cui, X. He and C. Xia, "Topology Review and Derivation Methodology of Single-Phase Transformerless Photovoltaic Inverters for Leakage Current Suppression," IEEE Trans. Ind. Elect., vol. 62, no. 7, pp. 4537-4551, July 2015.
  • J Ji, W. Wu, Y. He, Z. Lin, F. Blaabjerg and H. S. H. Chung, "A Simple Differential Mode EMI Suppressor for the LLCL-Filter-Based Single-Phase Grid-Tied Transformerless Inverter," IEEE Trans. Ind. Elect., vol. 62, no. 7, pp. 4141-4147, July 2015.
  • Y Bae and R.Y.Kim, "Suppression of Common-Mode Voltage Using a Multicentral Photovoltaic Inverter Topology With Synchronized PWM," IEEE Trans. Ind. Elect., vol. 61, no. 9, pp. 4722-4733, Sept. 2014.
  • N Vazquez, M. Rosas, C. Hernandez, E. Vazquez and F. J. Perez-Pinal, "A New Common-Mode Transformerless Photovoltaic Inverter," IEEE Trans. Ind. Elect., vol. 62, no. 10, pp. 6381-6391, Oct. 2015.
  • G Buticchi, E. Lorenzani and G. Franceschini, "A Five-Level Single-Phase Grid-Connected Converter for Renewable Distributed Systems," IEEE Trans. Ind. Elect., vol.60, no.3, pp.906-918, March 2013.
  • NA. Rahim and J. Selvaraj, "Multistring Five-Level Inverter With Novel PWM Control Scheme for PV Application," IEEE Trans. Ind. Elect., vol.57, no.6, pp.2111-2123, June 2010.
  • M Cavalcanti, K. De Oliveira, A. M. de Farias, F. Neves, G. Azevedo and F. Camboim, "Modulation Techniques to Eliminate Leakage Currents in Transformerless Three-Phase Photovoltaic Systems," IEEE Trans. Ind. Elect., vol. 57, no. 4, pp. 1360-1368, April 2010.
  • L Zhang, K. Sun, L. Feng, H. Wu and Y. Xing, "A Family of Neutral Point Clamped Full-Bridge Topologies for Transformerless Photovoltaic Grid-Tied Inverters," IEEE Trans. Power Elect., vol.28, no.2, pp.730-739, Feb. 2013.
  • M. Islam and S. Mekhilef, "H6-type transformerless single-phase inverter for grid-tied photovoltaic system," IET Elect. Power Elect., vol.8, no.4, pp.636-644, 2015.
  • H.F. Xiao, K. Lan and L. Zhang, "A Quasi-Unipolar SPWM Full-Bridge Transformerless PV Grid-Connected Inverter with Constant Common-Mode Voltage," IEEE Trans. Power Elect., vol.30, no.6, pp.3122-3132, June 2015.
  • B.Ji, J. Wang and J. Zhao, "High-Efficiency Single-Phase Transformerless PV H6 Inverter With Hybrid Modulation Method," IEEE Trans. Ind. Elect., vol.60, no.5, pp.2104-2115, May 2013.
  • G. Buticchi, D. Barater, E. Lorenzani, C. Concari and G. Franceschini, "A Nine-Level Grid-Connected Converter Topology for Single-Phase Transformerless PV Systems," IEEE Trans. Ind. Elect., vol.61, no.8, pp.3951-3960, Aug. 2014.
  • F. Hong, J. Liu, B. Ji, Y. Zhou, J. Wang and C. Wang, "Single Inductor Dual Buck Full-Bridge Inverter," IEEE Trans. Ind. Elect., vol.62, no.8, pp.4869-4877, Aug. 2015.
  • S. V. Araujo, P. Zacharias and R. Mallwitz, "Highly Efficient Single-Phase Transformerless Inverters for Grid-Connected Photovoltaic Systems," IEEE Trans. Ind. Elect., vol. 57, no. 9, pp. 3118-3128, Sept. 2010.
  • O. Lopez, R. Teodorescu and J. D. Gandoy, "Multilevel transformerless topologies for single-phase grid-connected converters," APEC 2006, pp.5191-5196, Nov. 2006.
  • O. Lopez, R. Teodorescu, F. Freijedo and J.D. Gandoy, "Leakage current evaluation of a single-phase Transformerless PV inverter connected to the grid," APEC 2007, pp.907-912, March 2007.
  • O. Lopez, F.D. Freijedo, A.G. Yepes, P. F. Comesaa, J. Malvar, R. Teodorescu and J. D. Gandoy, "Eliminating Ground Current in a Transformerless Photovoltaic Application," IEEE Trans. Energy Conv., vol.25, no.1, pp.140-147, March 2010.
  • G. Vazquez, P.R.M. Rodriguez, G. Escobar, J.M. Sosa and R.M. Mendez, "A PWM method for single-phase cascade multilevel inverters to reduce leakage ground current in transformerless PV systems," (accepted for publication in International Transactions on Electrical Energy Systems, Wiley Publications).
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    " target="_blank"> BibTeX |
  • W Li, Y. Gu, H. Luo, W. Cui, X. He and C. Xia, "Topology Review and Derivation Methodology of Single-Phase Transformerless Photovoltaic Inverters for Leakage Current Suppression," IEEE Trans. Ind. Elect., vol. 62, no. 7, pp. 4537-4551, July 2015.
  • J Ji, W. Wu, Y. He, Z. Lin, F. Blaabjerg and H. S. H. Chung, "A Simple Differential Mode EMI Suppressor for the LLCL-Filter-Based Single-Phase Grid-Tied Transformerless Inverter," IEEE Trans. Ind. Elect., vol. 62, no. 7, pp. 4141-4147, July 2015.
  • Y Bae and R.Y.Kim, "Suppression of Common-Mode Voltage Using a Multicentral Photovoltaic Inverter Topology With Synchronized PWM," IEEE Trans. Ind. Elect., vol. 61, no. 9, pp. 4722-4733, Sept. 2014.
  • N Vazquez, M. Rosas, C. Hernandez, E. Vazquez and F. J. Perez-Pinal, "A New Common-Mode Transformerless Photovoltaic Inverter," IEEE Trans. Ind. Elect., vol. 62, no. 10, pp. 6381-6391, Oct. 2015.
  • G Buticchi, E. Lorenzani and G. Franceschini, "A Five-Level Single-Phase Grid-Connected Converter for Renewable Distributed Systems," IEEE Trans. Ind. Elect., vol.60, no.3, pp.906-918, March 2013.
  • NA. Rahim and J. Selvaraj, "Multistring Five-Level Inverter With Novel PWM Control Scheme for PV Application," IEEE Trans. Ind. Elect., vol.57, no.6, pp.2111-2123, June 2010.
  • M Cavalcanti, K. De Oliveira, A. M. de Farias, F. Neves, G. Azevedo and F. Camboim, "Modulation Techniques to Eliminate Leakage Currents in Transformerless Three-Phase Photovoltaic Systems," IEEE Trans. Ind. Elect., vol. 57, no. 4, pp. 1360-1368, April 2010.
  • L Zhang, K. Sun, L. Feng, H. Wu and Y. Xing, "A Family of Neutral Point Clamped Full-Bridge Topologies for Transformerless Photovoltaic Grid-Tied Inverters," IEEE Trans. Power Elect., vol.28, no.2, pp.730-739, Feb. 2013.
  • M. Islam and S. Mekhilef, "H6-type transformerless single-phase inverter for grid-tied photovoltaic system," IET Elect. Power Elect., vol.8, no.4, pp.636-644, 2015.
  • H.F. Xiao, K. Lan and L. Zhang, "A Quasi-Unipolar SPWM Full-Bridge Transformerless PV Grid-Connected Inverter with Constant Common-Mode Voltage," IEEE Trans. Power Elect., vol.30, no.6, pp.3122-3132, June 2015.
  • B.Ji, J. Wang and J. Zhao, "High-Efficiency Single-Phase Transformerless PV H6 Inverter With Hybrid Modulation Method," IEEE Trans. Ind. Elect., vol.60, no.5, pp.2104-2115, May 2013.
  • G. Buticchi, D. Barater, E. Lorenzani, C. Concari and G. Franceschini, "A Nine-Level Grid-Connected Converter Topology for Single-Phase Transformerless PV Systems," IEEE Trans. Ind. Elect., vol.61, no.8, pp.3951-3960, Aug. 2014.
  • F. Hong, J. Liu, B. Ji, Y. Zhou, J. Wang and C. Wang, "Single Inductor Dual Buck Full-Bridge Inverter," IEEE Trans. Ind. Elect., vol.62, no.8, pp.4869-4877, Aug. 2015.
  • S. V. Araujo, P. Zacharias and R. Mallwitz, "Highly Efficient Single-Phase Transformerless Inverters for Grid-Connected Photovoltaic Systems," IEEE Trans. Ind. Elect., vol. 57, no. 9, pp. 3118-3128, Sept. 2010.
  • O. Lopez, R. Teodorescu and J. D. Gandoy, "Multilevel transformerless topologies for single-phase grid-connected converters," APEC 2006, pp.5191-5196, Nov. 2006.
  • O. Lopez, R. Teodorescu, F. Freijedo and J.D. Gandoy, "Leakage current evaluation of a single-phase Transformerless PV inverter connected to the grid," APEC 2007, pp.907-912, March 2007.
  • O. Lopez, F.D. Freijedo, A.G. Yepes, P. F. Comesaa, J. Malvar, R. Teodorescu and J. D. Gandoy, "Eliminating Ground Current in a Transformerless Photovoltaic Application," IEEE Trans. Energy Conv., vol.25, no.1, pp.140-147, March 2010.
  • G. Vazquez, P.R.M. Rodriguez, G. Escobar, J.M. Sosa and R.M. Mendez, "A PWM method for single-phase cascade multilevel inverters to reduce leakage ground current in transformerless PV systems," (accepted for publication in International Transactions on Electrical Energy Systems, Wiley Publications).
  • Browse the best online HTML tools: editor, tags, cheat sheet, character codes, tag generators, website templates and more.

    " target="_blank">RIS |
  • W Li, Y. Gu, H. Luo, W. Cui, X. He and C. Xia, "Topology Review and Derivation Methodology of Single-Phase Transformerless Photovoltaic Inverters for Leakage Current Suppression," IEEE Trans. Ind. Elect., vol. 62, no. 7, pp. 4537-4551, July 2015.
  • J Ji, W. Wu, Y. He, Z. Lin, F. Blaabjerg and H. S. H. Chung, "A Simple Differential Mode EMI Suppressor for the LLCL-Filter-Based Single-Phase Grid-Tied Transformerless Inverter," IEEE Trans. Ind. Elect., vol. 62, no. 7, pp. 4141-4147, July 2015.
  • Y Bae and R.Y.Kim, "Suppression of Common-Mode Voltage Using a Multicentral Photovoltaic Inverter Topology With Synchronized PWM," IEEE Trans. Ind. Elect., vol. 61, no. 9, pp. 4722-4733, Sept. 2014.
  • N Vazquez, M. Rosas, C. Hernandez, E. Vazquez and F. J. Perez-Pinal, "A New Common-Mode Transformerless Photovoltaic Inverter," IEEE Trans. Ind. Elect., vol. 62, no. 10, pp. 6381-6391, Oct. 2015.
  • G Buticchi, E. Lorenzani and G. Franceschini, "A Five-Level Single-Phase Grid-Connected Converter for Renewable Distributed Systems," IEEE Trans. Ind. Elect., vol.60, no.3, pp.906-918, March 2013.
  • NA. Rahim and J. Selvaraj, "Multistring Five-Level Inverter With Novel PWM Control Scheme for PV Application," IEEE Trans. Ind. Elect., vol.57, no.6, pp.2111-2123, June 2010.
  • M Cavalcanti, K. De Oliveira, A. M. de Farias, F. Neves, G. Azevedo and F. Camboim, "Modulation Techniques to Eliminate Leakage Currents in Transformerless Three-Phase Photovoltaic Systems," IEEE Trans. Ind. Elect., vol. 57, no. 4, pp. 1360-1368, April 2010.
  • L Zhang, K. Sun, L. Feng, H. Wu and Y. Xing, "A Family of Neutral Point Clamped Full-Bridge Topologies for Transformerless Photovoltaic Grid-Tied Inverters," IEEE Trans. Power Elect., vol.28, no.2, pp.730-739, Feb. 2013.
  • M. Islam and S. Mekhilef, "H6-type transformerless single-phase inverter for grid-tied photovoltaic system," IET Elect. Power Elect., vol.8, no.4, pp.636-644, 2015.
  • H.F. Xiao, K. Lan and L. Zhang, "A Quasi-Unipolar SPWM Full-Bridge Transformerless PV Grid-Connected Inverter with Constant Common-Mode Voltage," IEEE Trans. Power Elect., vol.30, no.6, pp.3122-3132, June 2015.
  • B.Ji, J. Wang and J. Zhao, "High-Efficiency Single-Phase Transformerless PV H6 Inverter With Hybrid Modulation Method," IEEE Trans. Ind. Elect., vol.60, no.5, pp.2104-2115, May 2013.
  • G. Buticchi, D. Barater, E. Lorenzani, C. Concari and G. Franceschini, "A Nine-Level Grid-Connected Converter Topology for Single-Phase Transformerless PV Systems," IEEE Trans. Ind. Elect., vol.61, no.8, pp.3951-3960, Aug. 2014.
  • F. Hong, J. Liu, B. Ji, Y. Zhou, J. Wang and C. Wang, "Single Inductor Dual Buck Full-Bridge Inverter," IEEE Trans. Ind. Elect., vol.62, no.8, pp.4869-4877, Aug. 2015.
  • S. V. Araujo, P. Zacharias and R. Mallwitz, "Highly Efficient Single-Phase Transformerless Inverters for Grid-Connected Photovoltaic Systems," IEEE Trans. Ind. Elect., vol. 57, no. 9, pp. 3118-3128, Sept. 2010.
  • O. Lopez, R. Teodorescu and J. D. Gandoy, "Multilevel transformerless topologies for single-phase grid-connected converters," APEC 2006, pp.5191-5196, Nov. 2006.
  • O. Lopez, R. Teodorescu, F. Freijedo and J.D. Gandoy, "Leakage current evaluation of a single-phase Transformerless PV inverter connected to the grid," APEC 2007, pp.907-912, March 2007.
  • O. Lopez, F.D. Freijedo, A.G. Yepes, P. F. Comesaa, J. Malvar, R. Teodorescu and J. D. Gandoy, "Eliminating Ground Current in a Transformerless Photovoltaic Application," IEEE Trans. Energy Conv., vol.25, no.1, pp.140-147, March 2010.
  • G. Vazquez, P.R.M. Rodriguez, G. Escobar, J.M. Sosa and R.M. Mendez, "A PWM method for single-phase cascade multilevel inverters to reduce leakage ground current in transformerless PV systems," (accepted for publication in International Transactions on Electrical Energy Systems, Wiley Publications).
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