Research On Maximum Power Point Tracking Algorithm For Photovoltaic Power System

In today's society,due to a large amount of fossil energy use,caused the energy shortage and enviromental pollution,the two big problems need to be faced and solved by human beings.So the development and utilization of solar energy and photovoltaic power generation technology develop rapidly under this bachground,the output power of photovoltaic battery is affected by enviromental temperature and light intensity,has great randomness.In order to improve the photoeletric conversion efficiency of photovoltaic power system,more fully use the solar energy,It is of great practical significance to track the maximum power point of photovoltaic cellsIn this paper,the solar photovoltaic power generation system is introduced systematically.The working principle of the PV cell is analyzed and the mathematical expression of the relevant parameters of the PV cell is obtained.The simulation model is established and simulated in the environment.The influence of light intensity and temperature on the output characteristics of photovoltaic cells was analyzed.Then,the maximum power point tracking control technique was introduced.The principle of the common control method is analyzed and the advantages and disadvantages of different methods are summarized.On this basis,two improved composite control methods are proposed.The working principle of the converter is introduced,and the converter is applied to the photovoltaic The battery's maximum power point is tracked in the circuit.Finally,It's the analysis of the system simulation.The simulation models of the Boost conversion circuit is established,and the simulation analysis was carried out on the Boost conversion circuit,the simulation model of photovoltaic power generation system is established which has the function of tracking and controlling of maximum power point,then the control algorithm of traditional MPPT and the improved composite algorithm are simulated at the same time,the different algorithms are simulated when the light intensity or the temperature changes.A different method of simulatiom waveform of the output power is got,to observe the tracking effect of maximum power and aompare it accordingly.At last,the improved algorithm is got which has both speed and tracking accuracy.