| Human social development and scientific progress, can not be separated from the large demand for energy, with the tradition of growing depletion of fossil energy, worldwide energy crisis beginning to show, clean, renewable energy development and utilization of new imminent. Solar energy as an ideal renewable energy, has been a wide range of development and utilization of the most important way is the use of solar photovoltaic. With the strong support of Governments, solar photovoltaic power generation technology in the world has been widely studied.In this paper, grid-connected PV system in the core issue of theoretical analysis and discussion focus on photovoltaic arrays maximum power tracking, the improvement of inverter output waveform,island effect and anti- Islanding, etc. A detailed theoretical analysis, the corresponding control strategy.After the theoretical analysis, the use of MATLAB/Simulink software to establish a grid-connected PV system simulation model, through simulation, to verify the correctness of theoretical analysis, at the same time, designed to Microchip's dsPIC30F2010 control chip as the core and the solar photovoltaic grid-connected system's hardware and software, produced a prototype experiment.Finally, in the experimental prototype, based on the experimental platform to build, do the relevant experiments, that the system can achieve a very good maximum power point tracking, the realization of grid, the grid current and voltage in phase with the frequency, harmonic in line with national requirements. |
