Multi level Transformer less PV Inverter with Reduced Switching Losses and Elimination of CM leakage Current
Bhagyashree Karur1, Sanjeevkumar R A2
1Bhagyashree Karur, Department of Electrical and Electronics, PDA College of Engineering, Kalburagi, India.
2Dr. Sanjeevkumar R A, Department of Electrical and Electronics, PDA College of Engineering, Kalburagi, India.
Manuscript received on August 14, 2020. | Revised Manuscript received on September 02, 2020. | Manuscript published on September 10, 2020. | PP: 323-328 | Volume-9 Issue-11, September 2020 | Retrieval Number: 100.1/ijitee.K78100991120 | DOI: 10.35940/ijitee.K7810.0991120
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Abstract: In order to have efficient operation of grid connected Photovoltaic (PV) inverter, the issue of leakage current must be completely eliminated. For this new transformer less multilevel inverter is proposed in this paper with (k-1) levels in which k denotes the number of switches. The inverter provides zero common mode leakage current and also capable of operating under half of rated PV voltage, hence make this proposed inverter topology as LVRT (low voltage ride through) capable. Different modes are employed for the stable operation of the proposed inverter with varying input PV voltage. Simulation work is carried out for three, five and seven level proposed inverter topologies in MATLAB/Simulink software which determines its maximum power point tracking performance. Here the THD (Total Harmonic Distortions) of 3, 5 and 7 levels are compared.
Keywords: Multilevel inverter, Transformer less PV inverter, Common mode current, LVRT, Leakage Current.