Sahaya A Ponrekha1,2, M.S.P. Subathra1, and C. Bharatiraja This email address is being protected from spambots. You need JavaScript enabled to view it.2
1Department of Electrical and Electronics Engineering, Karunya Institute of Technology and Sciences, Coimbatore, Tamilnadu, India, 641114 2Department of Electrical and Electronics Engineering, SRM Institute of Science and Technology, Kattankulathur, Tamilnadu, India, 603203
Received: July 27, 2021 Accepted: December 16, 2021 Publication Date: January 28, 2022
Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.
Transformerless inverters are prominently used in the single-phase grid-connected system due to their reduced size, weight, and high efficiency. Common-mode leakage current is the main issue of transformerless inverters, which has to be mitigated. An AC-decoupled high gain inverter is proposed in the inverter capable of attaining the gain more than ten times. Hence, even if the PV voltage is less, the inverter can continue to supply the grid. Unlike the two-stage inverters, the proposed inverter doesn’t require the DC-link capacitor, and it’s charging diode between the boosting and inverter stages. The AC-decoupling method used in the inverter helps to reduce the leakage current within the German standard limit VDE0126-1-1. A detailed steady-state analysis of the inverter is presented. The proposed inverter is simulated in the MATLAB Simulink platform to validate its working principle. The comparative loss and thermal analysis of the semiconductor switches made of three different materials (Gallium Nitride, Silicon Carbide, and Silicon) are made in the PLECS platform. The comparative analysis proves that the proposed inverter with Gallium Nitride made switches offers higher efficiency and reliability.
Keywords: Transformerless inverter, Common-mode voltage, Common-mode leakage current, Loss analysis
REFERENCES
[1] T. Hou, Y. Chen, Y. Chen, and C. Bao, (2021) “Research on control of a new quasi-Z source photovoltaic grid-connected inverter based on power feedforward and optimized PCI of bacterial foraging" Journal of Applied Science and Engineering (Taiwan) 24(4): 595–609. DOI: 10.6180/jase.202108_24(4).0015.
[2] M. Shayestegan, (2018) “Overview of grid-connected two-stage transformer-less inverter design" Journal of Modern Power Systems and Clean Energy 6(4): 642–655. DOI: 10.1007/s40565-017-0367-z.
[3] W. Li, Y. Gu, H. Luo,W. Cui, X. He, and C. Xia, (2015) “Topology review and derivation methodology of single phase transformerless photovoltaic inverters for leakage current suppression" IEEE Transactions on Industrial Electronics 62(7): 4537–4551. DOI: 10.1109/TIE.2015.2399278.
[4] P. Madasamy, V. Kumar, P. Sanjeevikumar, J. Holm-Nielsen, E. Hosain, and C. Bharatiraja, (2019) “A three-phase transformerless T-Type- NPC-MLI for grid connected PV systems with common-mode leakage current mitigation" Energies 12(12): DOI: 10.3390/en12122434.
[5] T. Shimizu, O. Hashimoto, and G. Kimura, (2003) “A novel high-performance utility-interactive photovoltaic inverter system" IEEE Transactions on Power Electronics 18(2): 704–711. DOI: 10.1109/TPEL.2003.809375.
[6] A. Kadam and A. Shukla, (2017) “A Multilevel Transformerless Inverter Employing Ground Connection between PV Negative Terminal and Grid Neutral Point" IEEE Transactions on Industrial Electronics 64(11): 8897–8907. DOI: 10.1109/TIE.2017.2696460.
[7] R. Barzegarkhoo, Y. Siwakoti, N. Vosoughi, and F. Blaabjerg, (2021) “Six-Switch Step-Up Common-Grounded Five-Level Inverter with Switched-Capacitor Cell for Transformerless Grid-Tied PV Applications" IEEE Transactions on Industrial Electronics 68(2): 1374–1387. DOI: 10.1109/TIE.2020.2967674.
[8] B. Chen, B. Gu, J.-S. Lai, W. Yu, C.-Y. Lin, and C. Zheng. “Current distortion correction in dual buck photovoltaic inverter with a novel PWM modulation and control method”. In: 2013, 727–731. DOI: 10.1109/APEC.2013.6520290.
[9] B. Yang,W. Li, Y. Gu,W. Cui, and X. He, (2012) “Improved transformerless inverter with common-mode leakage current elimination for a photovoltaic grid-connected power system" IEEE Transactions on Power Electronics 27(2): 752–762. DOI: 10.1109/TPEL.2011.2160359.
[10] H. Schmidt, C. Siedle, and J. Ketterer. DC/AC converter to convert direct electric voltage into alternating voltage or into alternating current. US patent 7046534.2006.
[11] S. Kuncham, K. Annamalai, and N. Subrahmanyam, (2020) “A Two-Stage T-Type Hybrid Five-Level Transformerless Inverter for PV Applications" IEEE Transactions on Power Electronics 35(9): 9512–9523. DOI: 10.1109/TPEL.2020.2973340.
[12] H. Xiao, X. Liu, and K. Lan, (2014) “Zero-voltage transition full-bridge topologies for transformerless photovoltaic grid-connected inverter" IEEE Transactions on Industrial Electronics 61(10): 5393–5401. DOI: 10.1109/TIE.2014.2300044.
[13] H. Xiao, K. Lan, B. Zhou, L. Zhang, and Z.Wu, (2015) “A family of zero-current-transition transformerless photovoltaic grid-connected inverter" IEEE Transactions on Power Electronics 30(6): 3156–3165. DOI: 10.1109/TPEL.2014.2337513.
[14] L. Breazeale and R. Ayyanar, (2014) “A photovoltaic array transformer-less inverter with film capacitors and silicon carbide transistors" IEEE Transactions on Power Electronics 30(3): 1297–1305. DOI: 10.1109/TPEL.2014.2321760.
[15] A. Anurag, N. Deshmukh, A. Maguluri, and S. Anand, (2018) “Integrated DC-DC Converter Based Grid-Connected Transformerless Photovoltaic Inverter With Extended Input Voltage Range" IEEE Transactions on Power Electronics 33(10): 8322–8330. DOI: 10.1109/TPEL.2017.2779144.
[16] S. Dhara and V. Somasekhar, (2020) “An Integrated Semi-Double Stage-Based Multilevel Inverter with Voltage Boosting Scheme for Photovoltaic Systems" IEEE Journal of Emerging and Selected Topics in Power Electronics 8(3): 2326–2339. DOI: 10.1109/JESTPE.2019.2955729.
[17] M. Salvador, T. Lazzarin, and R. Coelho, (2018) “High Step-Up DC-DC Converter with Active Switched-Inductor and Passive Switched-Capacitor Networks" IEEE Transactions on Industrial Electronics 65(7): 5644–5654. DOI: 10.1109/TIE.2017.2782239.
[18] T. Freddy, N. Rahim,W.-P. Hew, and H. Che, (2014) “Comparison and analysis of single-phase transformerless grid-connected PV inverters" IEEE Transactions on Power Electronics 29(10): 5358–5369. DOI: 10.1109/TPEL.2013.2294953.
[19] M. Khan, Y. Siwakoti, L. Li, and F. Blaabjerg, (2020) “H-Bridge zero-voltage switch-controlled rectifier transformerless midpoint-clamped inverter for photovoltaic applications" IEEE Journal of Emerging and Selected Topics in Power Electronics 8(4): 4382–4394. DOI: 10.1109/JESTPE.2019.2938224.
[20] M. Khan, M. Forouzesh, Y. Siwakoti, L. Li, T. Kerekes, and F. Blaabjerg, (2020) “Transformerless Inverter Topologies for Single-Phase Photovoltaic Systems: A Comparative Review" IEEE Journal of Emerging and Selected Topics in Power Electronics 8(1): 805–835. DOI: 10.1109/JESTPE.2019.2908672.
[21] F. Asadi and K. Eguchi. Simulation of Power Electronics Converters Using PLECS®. Academic Press, 2019.
[22] MS Windows NT Kernel Description. https://www.plexim.com/sites/default/files/tutorials/thermal_domain. Accessed: 2021-09-30.
[23] Thermal Simulation Accounting for Switching and Conduction Losses. https: //www.plexim.com/products/plecs/thermal.Accessed: 2021-09-30.
[24] R. Mitova, R. Ghosh, U. Mhaskar, D. Klikic, M.-X. Wang, and A. Dentella, (2014) “Investigations of 600-v gan HEMT and GaN diode for power converter applications" IEEE Transactions on Power Electronics 29(5): 2441–2452. DOI: 10.1109/TPEL.2013.2286639.
[25] C. Bharatiraja, K. Lakshmikhandan, M. Kamalesh, D. Rajasekaran, and B. Twala, (2021) “A non-isolated high-gain dc to dc converter connected multi-level inverter for photo-voltaic energy sources" Journal of Applied Science and Engineering (Taiwan) 24(3): 415–422. DOI: 10.6180/jase.202106_24(3).0017.
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