ISSN 2456-0235

International Journal of Modern Science and Technology


​​​​​​International Journal of Modern Science and Technology, Vol. 2, Special Issue 1, 2017, Pages 20-25.


Three phase grid connected transformer less mosfet Inverter for photovoltaic system

V. Suriyakala­, V. Mohan, B. Amalore Naveen Antony
Department of Electrical and Electronics Engineering, E.G.S.Pillay Engineering College, Nagapattinam, India.

*Corresponding author’s e-mail:

The unipolar sinusoidal pulse width modulation (SPWM) full-bridge transformer less photovoltaic (PV) inverter can achieve high efficiency by using latest super-junction metal oxide semiconductor field effect transistor (MOSFET) together with silicon carbide (Sic) diodes. However, the MOSFETs are limited to use in transformer less PV inverter due to the low reverse recovery characteristics of the body diode. In this paper, a family of new transformer less PV inverter topology for single-phase grid-tied operation is proposed using super-junction MOSFETs and Sic diodes as no reverse recovery issues are required for the main power switches for unity power operation. In addition, dead time is not necessary for main power switches at both the high frequency commutation and the grid zero crossing instant, results low current distortion at output. The dc operating principles of the proposed inverter and the voltage balancing method of the multilevel inverter is controlled with Sinusoidal Pulse-Width Modulation (SPWM). This paper contains theoretical analysis and simulation result of this novel multilevel inverter. Finally, a 1kw prototype is built and tested to verify the theoretical analysis. The experimental results show 98.5% maximum efficiency and 98.32% European efficiency. Furthermore, to show the effectiveness, the proposed topology is compared with the other transformer less topologies.

​​Keywords: DC–AC Inverter; Digital Signal Processor; Maximum Power Point Tracking; Multi Level Inverter; Sinusoidal Pulse With Modulation.


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