Research On Maximum Power Point Tracking Control Algorithm Of Photovoltaic Power System

With the emergence of the world energy crisis,it is urgent to protect the environment,which makes it necessary to find a new clean energy have become a top priority.The public attach an increasing number of importance to solar energy which is considered as green energy resources with advantages of cleanliness,widely distributed and renewable.The development and research of the photovoltaic technology have the great significance to energy protect our environment and the deficiency of natural resources.Owing to the large cotton fields and wide distribution in Xinjiang corps,drip irrigation control system by wired power supply high cost,energy dynamics of irrigation in remote areas not resolved,resulting in water saving irrigation project development,but the total amount of solar radiation and the sunshine hours in Xinjiang are high,taking into account the regional characteristics of Xinjiang corps,combining the abundant solar energy resources and the lack of water resources,it is imperative to develop low power consumption wireless control technology of photovoltaic power supply.Researching photovoltaic power supply system based on the characteristic of wireless control of cotton trickle irrigation in Xinjiang corps.Because of the wind and rain,shielding,the operation of the earth and other reasons,the sun cannot shine continuously,the intensity of light is constantly changing,so solar power is intermittent,volatile and changing,it is necessary to convert the electric energy into steady current in practical application.Through analyzing the characteristics of the solar arrays and photovoltaic power supply system,it is found that the output performance is affected by insolation intensities and temperature,which leads to the instability of power output,in order to photovoltaic power supply system run with high efficiency and stability,in the design maximum power point tracking(MPPT)algorithm has been introduced,used to stabilize the output to ensure driving load.Based on the study of the principle of maximum power point tracking in the photovoltaic power supply system,the MPPT algorithm is analyzed and compared,according to the application of the independent photovoltaic power supply system of wireless control of trickle irrigation in Xinjiang corps,we put forward a scheme of an improved method for photovoltaic power supply system,which,having been designed of optimal perturb and observe algorithm,namely,combining constant voltage algorithm with a variable step size perturb and observe algorithm.Under the Matlab/Simulink environment,the whole system simulation model of optimal is developed,the simulation results verify the availability of the proposed algorithm.The results show that the algorithm is effective and stable,and the feasibility of the algorithm is verified.The optimized system is stable and reliable,which can provide electric energy for the load and ensure the normal operation of the wireless control system of cotton drip irrigation.Research on maximum power point tracking algorithm for photovoltaic power systems,solar energy and water saving irrigation combination,not only low carbon environmental protection,but also save energy and water,which can provide the theoretical basis for theactual solar drip irrigation system,provide the reference value for the study of wireless control of cotton trickle irrigation in Xinjiang corps.