Bipolar DC output fed grounded DC-AC converter for photovoltaic application




combined CUK-SEPIC converter, bipolar inverter, T-type inverter, F-type inverter, maximum power point tracking, transformerless inverter, single phase photovoltaic systems


Introduction. In recent years the usage of electricity has increased tremendously as the electrical needs and loads got increased. Hence the researchers focused on the electricity generation from renewable sources in order to promote sustainable green environment. Owing to the lesser cost and more reliable high efficiency system with reduced use of equipments became prominent for the grid connected photovoltaic single phase systems. The novelty of this proposed converters are to reduce total power loss and to analyze the performance of the converter under various modulation index and to have lesser harmonics using sinusoidal pulse width modulation technique for both T-type and F-type inverter. Interest of the work is to merge two DC-DC converters which have same output voltage in order to have transformer less utilization of power. This has given pathway to develop a new DC-DC converter network by merging the common input nodes of CUK and SEPIC converter. Purpose. This similar structure of both converters made it easy to combine the input stages of and to get bipolar output. Methods. Here we can get bipolar output without the utilization of transformer which minimizes the overall size of the proposed system. In this paper, a combined CUK-SEPIC based grid connected transformerless inverter for photovoltaic application is suggested. Results. The suggested converter is simulated using MATLAB and the results were discussed. Further the circuit is extended with a 1 kW F-type inverter to demonstrate grid connection of the converter. Practical value. This converter can be implemented for photovoltaic applications for obtaining the bipolar DC output from the DC source.

Author Biographies

R. Sindhuja, Annamalai University

Research Scholar, Department of Electrical Engineering, Faculty of Engineering and Technology

S. Padma, Annamalai University

Associate Professor, Department of Electrical Engineering, Faculty of Engineering and Technology


Parimalasundar E., Senthil Kumar R., Chandrika V.S., Suresh K. Fault diagnosis in a five-level multilevel inverter using an artificial neural network approach. Electrical Engineering & Electromechanics, 2023, no. 1, pp. 31-39. doi:

Meneses D., Blaabjerg F., Garcia O., Cobos J.A. Review and Comparison of Step-Up Transformerless Topologies for Photovoltaic AC-Module Application. IEEE Transactions on Power Electronics, 2013, vol. 28, no. 6, pp. 2649-2663. doi:

Parimalasundar E., Kumar N.M.G., Geetha P., Suresh K. Performance investigation of modular multilevel inverter topologies for photovoltaic applications with minimal switches. Electrical Engineering & Electromechanics, 2022, no. 6, pp. 28-34. doi:

Maalandish M., Hosseini S.H., Jalilzadeh T. High step‐up dc/dc converter using switch‐capacitor techniques and lower losses for renewable energy applications. IET Power Electronics, 2018, vol. 11, no. 10, pp. 1718-1729. doi:

Banaei M.R., Bonab H.A.F. A Novel Structure for Single-Switch Nonisolated Transformerless Buck–Boost DC–DC Converter. IEEE Transactions on Industrial Electronics, 2017, vol. 64, no. 1, pp. 198-205. doi:

Suresh K., Parimalasundar E. Design and Implementation of Universal Converter. IEEE Canadian Journal of Electrical and Computer Engineering, 2022, vol. 45, no. 3, pp. 272-278. doi:

Calais M., Agelidis V.G. Multilevel converters for single-phase grid connected photovoltaic systems-an overview. IEEE International Symposium on Industrial Electronics. Proceedings. ISIE’98 (Cat. No.98TH8357), 1998, vol. 1, pp. 224-229. doi:

Suresh K., Parimalasundar E. A novel dual-leg DC-DC converter for wide range DC-AC conversion. Automatika, 2022, vol. 63, no. 3, pp. 572-579. doi:

Sonti V., Jain S., Bhattacharya S. Analysis of the Modulation Strategy for the Minimization of the Leakage Current in the PV Grid-Connected Cascaded Multilevel Inverter. IEEE Transactions on Power Electronics, 2017, vol. 32, no. 2, pp. 1156-1169. doi:

Ferrera M.B., Litran S.P., Duran E., Andujar J.M. A SEPIC-Cuk converter combination for bipolar DC microgrid applications. 2015 IEEE International Conference on Industrial Technology (ICIT), 2015, pp. 884-889. doi:

Anurag A., Deshmukh N., Maguluri A., Anand S. Integrated DC–DC Converter Based Grid-Connected Transformerless Photovoltaic Inverter With Extended Input Voltage Range. IEEE Transactions on Power Electronics, 2018, vol. 33, no. 10, pp. 8322-8330. doi:

Siwakoti Y.P., Blaabjerg F. Common-Ground-Type Transformerless Inverters for Single-Phase Solar Photovoltaic Systems. IEEE Transactions on Industrial Electronics, 2018, vol. 65, no. 3, pp. 2100-2111. doi:

Sabry A., Mohammed Z. M., Nordin F.H., Nik Ali N.H., Al-Ogaili A.S. Single-Phase Grid-Tied Transformerless Inverter of Zero Leakage Current for PV System. IEEE Access, 2020, vol. 8, pp. 4361-4371. doi:

Siddique M.D., Mekhilef S., Shah N.M., Memon M.A. Optimal Design of a New Cascaded Multilevel Inverter Topology With Reduced Switch Count. IEEE Access, 2019, vol. 7, pp. 24498-24510. doi:

Kumar K.V., Kumar R.S. Analysis of Logic Gates for Generation of Switching Sequence in Symmetric and Asymmetric Reduced Switch Multilevel Inverter. IEEE Access, 2019, vol. 7, pp. 97719-97731. doi:

Odeh C., Lewicki A., Morawiec M., Kondratenko D. Three-Level F-Type Inverter. IEEE Transactions on Power Electronics, 2021, vol. 36, no. 10, pp. 11265-11275. doi:




How to Cite

Sindhuja, R., & Padma, S. (2023). Bipolar DC output fed grounded DC-AC converter for photovoltaic application. Electrical Engineering & Electromechanics, (2), 57–62.



Industrial Electronics