Dynamic Thermal Analysis of Stator Radial Channel for Evaporative Cooling Permanent Magnet Wind Generators

In order to study the good cooling characteristics of evaporative cooling technology in wind power generation technology, the fully immersed evaporative cooling semi-direct-drive permanent magnet wind generators (ECSDDPMWGs) are taken as the research object to study the dynamic thermal characteristics of the windings in stator radial channel under variable wind speed in this paper. Firstly, the lump parameter thermal network (LPTN) model of evaporative cooling stator radial channels is established and the dynamic temperature response of the windings is analyzed based on the LPTN model and verified by the temperature rise experiment of the prototype. Then the output power of the wind generators under variable wind speed is analyzed based on the Weibull distribution of the wind speed. Finally, the dynamic thermal of the windings in stator radial channels is analyzed based on the LPTN model and variable wind speed. The results show that the LPTN model can effectively analyze the variable thermal of windings in the stator radial channel, which can provide a theoretical reference for the dynamic thermal prediction of windings in ECSDDPMWGs. In addition, it can be seen from the analysis that the evaporative cooling technology has a good adaptive performance to the variable load wind turbine applications.