Design and Implementation of Transformerless Grid Connected PV Inverter with Mitigating Leakage Currents

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Amereh, Mohammad | 2014

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 46592 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Zolghadri, Mohammad Reza
Abstract:
In recent years Photovoltaic Panels (PV) are very wide spread. Due to AC working mode of many consumers produce DC voltage of PV must be converted to AC voltage by inverters. Nowdays one of the most popular inverter topologies are grid connected transformerless inverters. The main task of transformer is galvanic isolation of PV from grid. These transformers are commonly work with grid frequency i.e 50 Hz, and consequently are bulky, heavy and expensive. Transformer elimination results in common mode leakage current from parasitic capacitors of PV cells and its grounded frame to the grid ground, that will cause in EMI and malfunction of earth fault relays.
In this thesis the factors of generating common mode voltage are scrutinized. Some new two methods are presented to eliminate the common mode voltage. To verify the predictions in the above mentioned methods, appropriate simulations are represented. Finally a low power prototype is implemented and comparsion between the simulation results and practical ones are submitted
Keywords:
Leakage Current ; Solar Energy ; Grid Connected State ; Common Mode Voltage ; Transformerless Inverter

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