| Many governments take more and more attention on the solar energy generating systems, because of its sustainability and cleanliness. The grid-connected photovoltaic generating has the most significant value in both theory and practice. Recently, three-phase Grid-connected Photovoltaic System (GCPV) has become the cutting-edge of this field. With the background, this paper takes much effort in the GCPV hardware design, control algorithm research, simulation and experiments. Firstly, this paper makes a sufficient study in the solar energy applications and achievements in recent years, and then designs a 15kVA GCPV system. The paper carries out the details in the hardware topology, the DSP control board design, the main power items calculation. According to the design project, the paper establishes an experiment platform including the main power circuit, the inductor group for filtering, the DSP control board and data sampling circuit. Now the built experiment platform provides a flexible and reliable foundation to realize the control algorithms. A synthetic control algorithm has been proposed in creative way by the paper. This algorithm combines the MPPT (Maximum Power Point Tracking) and the instantaneous reactive power theory. With the algorithm, GCPV can not only provides the active power into the grid, but also compensates the reactive and harmonic currents in the grid. Plenty of simulations by MATLAB has been done to prove the algorithm at the operating stable and transient conditions of GCPV. The paper has done a lot of experiments and gathers many results on the built platform. The experiment results are shown and analyzed. Finally, the paper gets the conclusions. The presented algorithm by the paper reaches its synthetic control targets. With the Deadbeat PWM, the algorithm shows the better performances, in the stable status and transient process, than other control strategies such as the timing comparison method, the PI method and triangle comparison method.
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