Single phase transformerless inverter for grid connected photovoltaic system with reduced leakage current
Keywords:transformerless inverter, leakage current, photovoltaic system
Introduction. Transformerless inverters are of vital importance in the field of grid connected solar photovoltaic systems offering higher efficiency than the conventional one. i.e., using transformer. General grid connected inverters are constituting of transformers requires more area besides the loss in them. Problem. Eliminating transformers can cause leakage current due to the variation of common mode voltage which in turn due to parasitic capacitance effect. Research literature in transformerless inverters has addressed the problems of common mode leakage current issues by offering the study of different inverter topologies like H4, H5, H6 and HERIC etc. utilizing variety of modulation strategies like unipolar, bipolar pulse width modulations. Goal. The paper significantly presents a new transformerless inverter topology, analyzes common mode voltage and leakage current behavior of the system. The simulation is carried out for comparing the leakage current profiles with other transformerless inverter topologies in literature. Novelty. This paper gives an impression of the efficient transformerless inverter for grid connected photovoltaic system. Results. The various inverter topologies full bridge with different pulse width modulation techniques are analyzed and to determine the common mode voltages and leakage currents.
Salmi T., Bouzguenda M., Gastli A., Masmoudi A. Review of Common-Mode Voltage in Transformerless Inverter Topologies for PV Systems. In: M’Sirdi N., Namaane A., Howlett R.J., Jain L.C. (eds) Sustainability in Energy and Buildings. Smart Innovation, Systems and Technologies, 2012, vol 12. Springer, Berlin, Heidelberg. doi: https://doi.org/10.1007/978-3-642-27509-8_49.
Albalawi H., Zaid S. An H5 Transformerless Inverter for Grid Connected PV Systems with Improved Utilization Factor and a Simple Maximum Power Point Algorithm. Energies, 2018, vol. 11, no. 11, art. no. 2912. doi: https://doi.org/10.3390/en11112912.
Janardhan G., Srinivas G.N., Surendra Babu N.N.V. Realization of Constant Common Mode Voltage in Transformerless Photo Voltaic Inverter Topologies. 2018 International Conference on Circuits and Systems in Digital Enterprise Technology (ICCSDET), 2018, pp. 1-5. doi: https://doi.org/10.1109/ICCSDET.2018.8821224.
Nagarjuna Reddy J., Jyothi K. Analysis and Modeling of Transformerless Photovoltaic Inverter Systems. International Journal of Modern Engineering Research, 2013, vol. 3, no. 5, pp. 2932-2938. Available at: http://www.ijmer.com/papers/Vol3_Issue5/CB3529322938.pdf (accessed 16 May 2021).
Figueredo R.S., de Carvalho K.C.M., Ama N.R.N., Matakas L. Leakage current minimization techniques for single-phase transformerless grid-connected PV inverters – An overview. 2013 Brazilian Power Electronics Conference, 2013, pp. 517-524. doi: https://doi.org/10.1109/COBEP.2013.6785164.
Hassaine L., Bengourina M.R. Design and digital implementation of power control strategy for grid connected photovoltaic inverter. International Journal of Power Electronics and Drive Systems, 2019, vol. 10, no. 3, pp. 1564-1574. doi: https://doi.org/10.11591/ijpeds.v10.i3.pp1564-1574.
Wu T.-F., Nien H.-S., Shen C.-L., Chen T.-M. A Single-Phase Inverter System for PV Power Injection and Active Power Filtering With Nonlinear Inductor Consideration. IEEE Transactions on Industry Applications, 2005, vol. 41, no. 4, pp. 1075-1083. doi: https://doi.org/10.1109/TIA.2005.851035.
Binh T.C., Tuan-Dat M., Dung N.M., An P.Q., Truc P.D., Phuc N.H. Active and Reactive Power Controller for Single-Phase Grid-Connected Photovoltaic Systems. The 1st Regional Workshop in New/Renewable Energy of AUN/SEED-Net, 2009. Available at: http://www4.hcmut.edu.vn/~tcbinh/Papers/HCMUT_VN_paper_Single-Phase%20Grid-%20Connected%20PV%20Systems_Feb21_2009_V2.pdf (accessed 16 May 2021).
Khan M.N.H., Forouzesh M., Siwakoti Y.P., Li L., Kerekes T., Blaabjerg F. Transformerless Inverter Topologies for Single-Phase Photovoltaic Systems: A Comparative Review. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2020, vol. 8, no. 1, pp. 805-835. doi: https://doi.org/10.1109/JESTPE.2019.2908672.
Panda S.R., Babu B.C. Phase estimation for grid synchronization using CORDIC algorithm with SRF-PLL. 2012 IEEE Students' Conference on Electrical, Electronics and Computer Science, 2012, pp. 1-4, doi: https://doi.org/10.1109/SCEECS.2012.6184724.
Syed Sha Mohammed. Tranformerless H6 Grid Tied Inverter For Photovoltaic Generation. International Journal Of Modern Engineering Research, 2014, vol. 4, no. 12, pp. 16-24. Available at: https://www.ijmer.com/papers/Vol4_Issue12/Version-2/C04012_02-1624.pdf (accessed 16 May 2021).
Golestan S., Monfared M., Freijedo F.D., Guerrero J.M. Design and Tuning of a Modified Power-Based PLL for Single-Phase Grid-Connected Power Conditioning Systems. IEEE Transactions on Power Electronics, 2012, vol. 27, no. 8, pp. 3639-3650. doi: https://doi.org/10.1109/TPEL.2012.2183894.
Yang B., Li W., Gu Y., Cui W., He X. Improved Transformerless Inverter With Common-Mode Leakage Current Elimination for a Photovoltaic Grid-Connected Power System. IEEE Transactions on Power Electronics, 2012, vol. 27, no. 2, pp. 752-762. doi: https://doi.org/10.1109/TPEL.2011.2160359.
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