Research On Wind Turbine Water Pumping System Based On Variable Frequency Speed Regultion Of Asynchronous Motor

With the rapid progress of human society and the rapid economic development,accelerating the speed of fossil energy consumption,unlimited use of fossil fuels will not only be depleted and in the combustion process will produce greenhouse gases and haze.As the use of wind energy in the process will not cause environmental pollution and inexhaustible,in the context of global advocacy for sustainable development,is being widely concerned about the world and gradually become the protagonist of green energy.China's western region is rich in wind energy resources,according to local conditions to large-scale development and application of wind turbine water pumping technology not only can effectively use wind energy resources,but also to solve remote areas of drinking water and farmland irrigation water problems.Firstly,this paper introduces the research background and significance of wind turbine water pumping system,and summarizes the research status at home and abroad.In view of the actual situation of drinking water and farmland irrigation water in remote areas,the composition structure of wind turbine water pumping system is studied,and the working principle and characteristics of each part of the system are analyzed.Secondly,in the wind turbine water pumping system,because the motor in the full pressure start when the current is too large,resulting in stator winding heat to accelerate the aging of the insulation,and the impact of the inverter.In addition,due to the instability of the wind speed,resulting in the motor can not be stable operation,and sometimes block the phenomenon of stall,stall for too long will burn the motor.Therefore,this paper presents the asynchronous motor frequency conversion vector control method and soft start control method,not only can make the motor speed to achieve smooth speed control,and can reduce the starting current,play a role in protecting the inverter and the motor.Thirdly,the wind turbine,water pump and motor are selected and the volume of the reservoir is determined by investigating the depth of the wells in the residents of the remote areas and the household daily water consumption.A set of off-grid wind turbine water pumping system is designed,and the control circuit parameters of the system are designed.Finally,in the MATLAB environment,Simulink is used to verify the designed wind turbine water pumping system.The results show that under the conditions of different wind speed,the soft start and variable frequency vector control method can be used to stabilize the wind turbine water pumping system.