An Improved Single Phase Transformer less Inverter Topology for Cost Effective PV Systems
Journal Title: International Journal of Modern Engineering Research (IJMER) - Year 2014, Vol 4, Issue 6
Abstract
In grid connected PV systems, the elimination of isolation transformer introduces common mode leakage current due to the parasitic capacitance between PV panels and the ground. The common mode leakage current reduces the efficiency of power conversion stage, affects the quality of grid current, deteriorate the electric magnetic compatibility and give rise to various safety threats. In order to eliminate the leakage current, an improved transformer less topology with virtual DC bus concept is proposed here. By connecting the grid neutral line directly to the negative pole of the DC bus, the stray capacitance between the PV panels and the ground is bypassed. The topology consists of only five power switches, two capacitors and the filter section. Therefore, the power electronics cost can be curtailed. This advanced topology can be modulated with the sinusoidal pulse width modulation (SPWM) to reduce the output current ripple. The simulation result of the proposed topology using MATLAB/SIMULINK is presented.
Authors and Affiliations
Geethu Chacko1 , Riya Scaria2
Keywords
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- EP ID EP88692
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