Design and implementation of a single phase grid tie photo voltaic inverter

This paper is aimed to present the design of a single-phase grid tie photovoltaic inverter with practical implementation. Special consideration given to the fact that, unlike conventional standalone inverters, grid tie inverters are required to fulfill some demands to be connected with the single-phase grid. The demands of the single-phase grid and photovoltaic module are fulfilled and tested through the practical implementation of the inverter. In addition, in this document the reference voltage fixation method for DC-AC inversion, switching techniques by PIC microcontroller, IGBT gate drive circuit operation with proper filtering and finally power delivery to the grid with proper isolation has been shown with both simulation and practical test outputs. The achievements of the practical testing of grid tie inverter lies in successful DC-AC conversion. Along with the capability of matching inverter output voltage and frequency with continuous fluctuating grid voltage and frequency. Another fact is, inverter must stop inversion process if there is no power supply in grid line. Therefore, instantaneous shut down of DC-AC inversion process occurs in case of sudden black out is also tested. Finally, the efficient energy delivery of PV cells to the single-phase grid validates experimental results.