The Research Of Maximum Power Point Tracking Control In Photovoltaic System

Solar power is a new green power. It is regarded as clean, pollution-free, and inexhaustible. Photovoltaic conversion is an effective way to use solar power. Because the price of photovoltaic cell is expensive and conversion efficiency is low presently, the Maximum Power Point Tracking is absolutely necessary, in order to decrease system cost and increase efficiency.The paper focuses on the stand-alone photovoltaic system and analyzes it with theory. We pay our emphases on the implementation about selecting parameters, topology structure, control strategy, and so on .The main contents are listed as follows:First, introduces the background, significance, work.Second, according to different needs classing two structures; analyzing the principle of the solar panel and using the MATLAB software to build the simulation of the output characteristic for the solar cell under different temperature and isolation. The simulation results confirm that the solar cell is non-linear.Third, introduces the MPPT principle, comparing several common MPPT methods and find out their advantage and disadvantage,and improved P&O is adjust duty cycle to realize MPPT.Fourth, analysis three DC/DC converters'principles, compares the convert efficiency by simulation and experiment. It is the find out the Boost circuit is the highest circuit of converted efficiency.Last, analyzing the realize of the MPPT method's software, using the MATLAB software to build the simulation of the P&O, INC and improved P&O, both of them realize the MPPT, but they have each of their characteristics. We must choose the different methods according to the different occasions.