Comparison of Various Transformerless Full-bridge Topologies for Photovoltaic Grid -Tied Inverters
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2015, Vol 3, Issue 7
Abstract
If there is no transformer is used in the single phase grid tied photovoltaic system, then the electrical connection live between the grid and the PV array. In this condition, the generated common mode voltage largely determines the leakage current. It flows through the parasitic capacitance, which is presented between the PV array and the ground. This leakage current can cause radiated interference effect, harmonics and losses. Neutral point clamped topologies are the efficient path to reduce the leakage current. In this paper, two basic switching cells, positive neutral point clamped cell and negative neutral point clamped cell are introduced to flesh NPC topologies and unipolar sinusoidal pulse width modulation(USPWM) technique is used for the inverter. Here two existing topologies such as optimized H5(OH5) and full bridge DC bypass (FB-DCBP) are explained and also compared with the proposed positive negative neutral point clamped (PN-NPC) topology. The simulation results show the common mode voltage, THD and leakage current.
Authors and Affiliations
Y. Bhagyalakshmi, K. Kishore Reddy
Keywords
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