Photovoltaic Irrigation Pump System Design

With the rapid development of modern scientific information and agricultural technology,Mankind's demand for energy has increased rapidly.As a new green energy,solar energy has been used in various fields,in recent years,photovoltaic irrigation pump system in photovoltaic technology about drought resistance,water saving,energy saving and other aspects of great development,making it in the agricultural development has become another important application field.But most irrigation conditions are moist,pump motor is the power core of photovoltaic irrigation pump system.It is the main fault of PV irrigation pump system that stator inter-turn short circuit occurs in pump motor.Therefore,this paper takes solar power generation technology as power source,through comparing the water demand data of peanut crops in different environment and growth periods,then,selected the device of photovoltaic irrigation system,the maximum power point tracking style,the speed regulation of water pump,in order to satisfy the daily irrigation demand of peanut crop,the early diagnosis of stator inter-turn short circuit fault of motor was studied.The main contents of the study are as follows:Firstly,the annual solar radiation model is established based on the experimental geographical location parameters and the information of solar radiation and precipitation.On the basis of simulating the monthly environmental data of the experimental site,combined the water demand law of the Dryland crops and the precipitation distribution during the crop growth period,the required pumping amount,then calculating the number of solar photovoltaic panels and the capacity of the photovoltaic power supply unit.The suitable pump model is selected to analyze the structure of photovoltaic water pump irrigation system.The simulation of the relationship between the amount of light radiation and the amount of water pumped proves that the photovoltaic irrigation water pump system can meet the requirements of crop irrigation.The overall scheme is made to realize the design of photovoltaic irrigation pump system.Then,the personalities of the Solar photovoltaic cell were analyzed,and the mathematical model is established by statistics.The photovoltaic cell and the photovoltaic pump power supply system were simulated by PvSyst and MATLAB software,and the characteristic curve of thephotovoltaic array is obtained.The analysis of traditional MPPT(Maximum power point tracking)control algorithm shows that the step size is too large or too small,the power loss caused by the change of external environmental factors is large,and the efficiency is low.It's put to use adaptive transformable step shake observation principle is used to save the greatest power point reckon time,and also reduced the oscillation.the vector control of the pump motor is carried out by the method of rotor magnetic field orientation.Asynchronous motor is equivalent to the DC motor.The speed control method of the DC motor is simulated and the speed regulation of the AC pump motor is realized.Finally,This paper studies the relevant algorithms for the diagnosis of the mathematical model of the short-circuit fault of the stator of the pump motor is established,owing to the short-circuit fault occurs among the turns of the copper wire in the stator of the photovoltaic water pump motor,and puts forward a parameter estimation algorithm to diagnose the stator short-circuit fault.The method of parameter estimation is simulated by using MATLAB software.The simulation results show that it is feasible to diagnose the inter-turn short-circuit fault of stator windings of pump motor by using parameter estimation algorithm.