Experimental Study Of Photovoltaic Generation Control System

The problem such as air pollution and ecological destruction become more and more serious due to fossil fuels, such as coal, oil, gas, excessively exploit and unlimitedly use. Research on alternative energy such as wind energy, biological energy, solar energy has also been widespread concerned in the,world. Because of non-polluting and renewable, solar energy is much more welcomed in the world. In recent years, photovoltaic generation technology has been developed rapidly and photovoltaic equipments has been updated. Cause of new material, the convert efficiency of solar panels has been rised; The more computers have been applied, the more complex the maximum power tracking control method would be. Photovoltaic inverter are tend to be intelligent and miniaturization. How to obtain solar energy under various weather conditions and environment,become the main topic in the field of photovoltaic generation. Maximum power tracking control and the working principle of inverter grid control were discussed in thesis. Kinds of maximum power tracking control methods and grid-connected control methods were discussed. Especially focused on linear proportional to current combine with Incremental-Resistance method and grid current control space vector synthesis. In MATLAB/Simulink, a simulation model of photovoltaic power generation system was built, the various parameters of the system was debugged and settings. Simulation results showed that, under weak illumination, the linearly proportional to the current is better than other methods. There is high efficiency about grid current control space vector synthesis method in grid-connected. The linearly proportional to current combined Incremental-Resistance method and the current control space vector synthesis method have been verified.Based on the existing laboratory equipment, hardware system of the photovoltaic power generation system has been set up and optimized, the detection and conditioning modules, control modules, intelligent power module and the drive circuit were described. The selected parameters were calculated and tuning. Completed the commissioning of the entire system.Based on the CCS, photovoltaic system software was designed. Its main process and initialization process, capture interrupt were written. And software on hardware platform of photovoltaic power generation system were debugged. Finally the results was obtained, it showed that the theories of PV system expounded in paper can be implemented.