Analysis Of Thermal Properties For High Altitude Type Doubly-fed Wind Generator

With the development of the world economy and the problem of fossilenergy shortage is increasingly rigorous, the renewable and clean energyresources, which can replace the traditional fossil energy, are researching in theworld. The terrain of China is low in the east and high in the west, and presents aladder-like form. As to the wind power sources, it becomes larger with theincreasing altitude, the environment is very suitable for the operation of largewind generator. However, with increasing altitude, the physical characteristics ofcooling medium, especially gaseous medium, have significant change. It mayhave big effect on the characteristics of temperature rise for the forced air-cooling wind generator.In this paper, based on the analysis of the fluid field, temperature filed andthe electromagnetic field for the generator, the research purpose, the significanceand the content for the paper was made clear. A FYKS03-1.5MW high altitudetype doubly-fed wind generator was taken as the research object, According tothe theory of fluid mechanics and the numerical heat transfer, combining withstructure of the generator, the fluid flow and the characteristics of heat transfer,the solution of domain was defined. According to the actual operationenvironment and the conditions of the generator, the boundaries of the solutiondomain were set reasonable, and the method of fluid-solid coupling was adoptedto solve the problem. The fluid flow characteristics and the regularity ofdistribution of temperature rise were numerically and systematic studied underdifferent conditions, which the generator was operating respectively in the plain,the rated condition of4km altitude and the limit working condition of4kmaltitude. The comprehensive and comparative analysis between them shows that:This research realized the precise numerical solution for the problem of fluid-solid coupling in generator, and clarified the action laws and the influence degree of the altitude and operating conditions on the temperature rise. The fluid flowand the heat transfer for generator were calculated and analyzed, which canprovide the optimization design of the ventilation system and the theoreticalbasis of the operation for larger wind generator.