Research Of Wind Speed Control System For Erosion Wear Experiment Based On PLC

With the depletion of fossil fuels, wind energy as a new clean energy source by the global attention is developing rapidly.2013China (excluding Taiwan) new installed capacity16088.7MW, an increase of24.1%; cumulative installed capacity91412.89MW, an increase of21.4%. New installed capacity and total installed capacity of two data ranks first in the world.Inner Mongolia Autonomous Region is located in the central and western China.There is large area and rich of resources. Wind energy is a wealth of resources in our region. The region overall capacity of wind energy technology which can be developed more than150million kilowatts currently. It has reached the national wind energy resource reserves of land for more than50%. As of the end of March2013, Inner Mongolia has added1119.4MW of wind power capacity, and cumulative18623.8MW, and as the first of all the provinces(area and city).Wind energy technology in China started late but developed very soon. However, the fans and the related technologies mainly rely on imports. The special geographical environment makes import fans "acclimatized". Especially the blades in the north west region subject to sand erosion long-term, cause serious wear and tear. The working life of fan blades can reach to20years originally,but now they can just work several years because of abrasion. However the existing researches have no detailed evaluation of the wear of blades in the condition of sand erosion. So it is necessary to establish erosion test equipment in the laboratory to provide a theoretical basis for the optimal design of wind turbine blades coated.In this paper, the pressure as a decision factor, and make sure the erosion flow in the circular pipe unchanged, and by changing the size of the input wind pressure to change the wind speed. To realize wind speed control based on PLC control system. This article is mainly composed of three parts.The first part is review. It is mainly describe the wind situation in our region. The need to build facilities related erosion. Progress reports at home and abroad as well as related research content and research methods of this paper.The second part is mainly about wind erosion control system hardware selection and formation. It is including the design of sand erosion piping based on the knowledge of fluid mechanic and design of software program. The size of the gas output pressure is controlled by electrical proportional valve, electric proportional valve is controlled by the PLC control system, then the gas into the accelerated erosion pipe. The erosion pipeline is made of by three parts, including air inlet pipe, sand inlet pipe and hybrid accelerating tube. The sand inlet pipe can accelerate the airflow into the tube and the hybrid accelerating tube is designed to make the sand intensive mixing and have a common speed.The third part is mainly about experimental programs and methods of collecting experimental data. It is including how to measure wind speed, how to compare data etc. The experimental results show that the laboratory equipment can provide5m/s-25m/s wind speed, the quantity of sand enter into the pipe can be controlled to lg/s,2g/s,3g/s. It can satisfy the expected experiment requirement. The wind with sand has smaller influence on wind speed. So it can be ignored under a certain accuracy requirement.The overall test achieve anticipated goal, meet precision requirement could provide data and basis for related research.