Research Article

An Efficient Grid Connected Photovoltaic System Based on H6 Transformer-less Inverter

Essam Hendawi
Taif University, Saudi Arabia
* Corresponding author
DOI icon 10.24018/ejenergy.2023.3.3.125

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Submitted 2023-08-15
Published 2023-10-04

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Table of Contents

Article Main Content

Grid-connected photovoltaic (PV) systems based on transformer-less inverters have been widely used. Various topologies of transformer-less inverters are presented. The requirements of minimizing leakage current through transformer-less inverters and maximizing the power generated from PV arrays are of great importance. This paper presents a complete system that can effectively minimize the leakage current to safe values. In addition, operation at maximum PV array power point is realized. The system is based on modified H6 transformer-less inverter to minimize the leakage current. Perturbation and Observation P&O maximum power point tracker in addition to a dc-dc boost converter are utilized to achieve the second target. Analysis of each part and system controllers in the proposed system are presented in detail. Losses and system efficiency are introduced. Effects of sun irradiance variations are included. Simulation results prove the effectiveness of the proposed system.

Keywords: H6 transformer-less inverter leakage current maximum power point tracker PV array sun irradiance

References

  1. Haegel NM, and Kurtz SR. Global progress toward renewable electricity: tracking the role of solar. IEEE Journal of Photovoltaics. 2021;11(6):1335-1342.
     Google Scholar
  2. Qazi A, Hussain F, Abd. Rahim N, Hardaker G, Alghazzawi D, Shaban K and Haruna K. Towards sustainable energy: a systematic review of renewable energy sources, technologies, and public opinions. IEEE Access. 2019; (7):63837-63851.
     Google Scholar
  3. Shafiullah M, Ahmed SD and Al-Sulaiman AF. Grid integration challenges and solution strategies for solar pv systems: a review. IEEE Access. 2022; (10):52233- 52257.
     Google Scholar
  4. Abdel-Rahim O, Chub A, Vinnikov D and Blinov A. DC integration of residential photovoltaic systems: a survey. IEEE Access. 2022; (10):66974- 66991.
     Google Scholar
  5. Koutroulis E and Blaabjerg F. Methodology for the optimal design of transformerless grid-connected PV inverters. IET Power Electronics. 2012; 5(8):1491-1499.
     Google Scholar
  6. Hendawi E. Analysis, simulation and comparison between h6 transformer-less inverter topologies. Proceedings of the 21st International Middle-East Power Systems Conference (MEPCON), Dec 17-19 2019, Cairo, Egypt.
     Google Scholar
  7. Meneses D, Blaabjerg F, Garc´ıa O and Cobos JA. Review and comparison of step-up transformerless topologies for photovoltaic Ac-module application. IEEE Transactions on Power Electronics. 2013; 28(6):2649 - 2663.
     Google Scholar
  8. Blewitt WM, Atkinson DJ, Kelly J and Lakin RA. Approach to low-cost prevention of DC injection in transformerless grid connected inverters. IET Power Electronics. 2010; 3(1):111–119.
     Google Scholar
  9. Jayalakshmi NS, Kumar A and Kumar A. Analysis and design of single phase high efficiency transformer less pv inverter topology. International Journal of Power Electronics and Drive System (IJPEDS). 2018; 9(2):730-737.
     Google Scholar
  10. Hendawi Eand Zaid S. H7 three phase transformerless inverter for photovoltaic grid tied system with maximum power point operation. International Journal of Power Electronics and Drive Systems (IJPEDS). Sep 2021; 12(3):1853-1861.
     Google Scholar
  11. Nguyen HV, Park DH, and Lee DC. Single-phase transformerless pv power conditioning systems with low leakage current and active power decoupling capability. Journal of Power Electronics. 2018; 18(4):997-1006.
     Google Scholar
  12. Li H, Zeng Y, Zheng TQ and Zhang B. A novel H5-D topology for transformer-less photovoltaic grid-connected inverter application. Proceedings of the 8th International Power Electronics and Motion Control Conference (IPEMC-ECCE Asia), May 22-26 2016, Hefei.
     Google Scholar
  13. Zhang L, Sun K, Xing Y, and Xing M. H6 transformerless full-bridge PV grid-tied inverters. IEEE Transactions on Power Electronics. 2014; 29(3):1229 - 1238.
     Google Scholar
  14. Patrao I, Figueres E, González-Espín F and Garcerá G. Transformerless topologies for grid-connected single-phase photovoltaic inverters. Renewable and Sustainable Energy Reviews. 2011; 15(7):3423–3431
     Google Scholar
  15. Hendawi E. A high performance grid connected pv system based on heric transformerless inverter. Indonesian Journal of Electrical Engineering and Computer Science. 2020; 20(2):602-612.
     Google Scholar
  16. Baojian J, Jianhua W and Jianfeng Z. High-efficiency single-phase transformerless PV H6 inverter with hybrid modulation method. IEEE Transactions on Industrial Electronics. 2013; 60(5):2104–2115.
     Google Scholar
  17. Gupta AK, Agrawal H and Agarwal V. A novel three-phase transformerless h-8 topology with reduced leakage current for grid-tied solar PV applications. IEEE Transactions on Industrial Applications. 2018; 55(2):1765–1774.
     Google Scholar
  18. VDE 0126-1-1-2006. Automatic disconnection device between a generator and the public low-voltage grid,” DIN_VDE Normo, 2008.
     Google Scholar
  19. Yu W, Lai J, Qian H, and Hutchens C. High-efficiency MOSFET inverter with H6-type configuration for photovoltaic non-isolated ac-module applications. IEEE Transactions on Power Electronics. 2011; 26(4):1253-1260.
     Google Scholar
  20. Zhang L, Sun K, Xing Y, and Xing M. H6 transformer-less full bridge PV grid-tied inverters. IEEE Transaction on Power Electronics. 2014; 29(3):1229 – 1238.
     Google Scholar
  21. Atul Desai A, Mikkili S and Senjyu T. Novel H6 transformerless inverter for grid connected photovoltaic system to reduce the conduction loss and enhance efficiency. Energies. 2022, 15(10):3789.
     Google Scholar
  22. Atia Y. Photovoltaic Maximum Power Point Tracking Using SEPIC Converter. Engineering Research Journal (ERJ). Shebin El-Kom Journal. 2009; 36(4).
     Google Scholar
  23. Elgendy MA, Zahawi B and Atkinson DJ. Assessment of perturb and observe mppt algorithm implementation techniques for PV pumping applications. IEEE Transactions on Sustainable Energy. 2012; 3(1):21-33.
     Google Scholar
  24. Femia N, Petrone G, Spagnuolo G and Vitelli M. Optimization of perturb and observe maximum power point tracking method. IEEE Transactions on Power Electronics. 2005; 20(4):963 - 973.
     Google Scholar
  25. Salem MM. Classical controller with intelligent properties for speed of vector controlled induction motor. Journal of Power Electronics. 2008; 8(3):210-216.
     Google Scholar