Design And Research Of Heat Dissipation Device Of Wind Turbine Converter

The wind power converter is the core equipment in the wind turbine,and its performance and reliability are important factors that affect the quality of the wind power system.However,with the development of large-capacity wind turbines,the voltage and current impacts of power devices in the converter are getting larger and larger,resulting in higher and higher temperatures of the power devices.The service life of the middle electrical components,especially the insulated gate bipolar transistor module(IGBT)in the converter.The problem of heat dissipation has become a critical issue that needs to be solved urgently in the development of high-power wind turbines.This paper studies the heat dissipation of the converter of 2.5MW direct-drive permanent magnet wind turbines in Xinjiang.The main research contents and results are as follows:1.Field investigation and research analysis of the main heat source components in the wind turbine converter.Through the actual investigation of Dabancheng Wind Farm,it was found that the key power device IGBT module and reactor in the converter have high temperature problems,extract the monitoring data of the monitoring platform,and use the data processing tool to analyze the temperature changes of the two Analysis shows that the temperature difference between IGBT module temperature,reactor temperature and ambient temperature is about 40 ℃ and 50 ℃ respectively during normal operation of the wind turbine.Therefore,there is a lot of room for improvement of the wind power converter heat sink.2.Through the analysis of the current heat dissipation scheme used in the heat dissipation device of the wind turbine converter,and through practical investigation,it is found that the existing water cooling device cannot separate the supercooled water entering the converter in time,and can not timely Supercooled water for testing.In this paper,by adding a three-way valve at the entrance and changing the position of the two temperature sensors,the problem of the water cooling device is solved.Through the comparative analysis of the flow chart before and after the improvement of the water cooling device,the feasibility of the improved design of the water cooling device is proved.,Improve the safety,reliability and accuracy of the heat sink.3.In this paper,the water cooling plates used in the IGBT module and the reactor in the wind power converter are studied separately,and the factors affecting the heat dissipation performance of the water cooling plate are discussed through the method of finite element simulation and comparison.Through the design simulation of the IGBT module water cooling plate,it is found that the multi-layer flow channel has higher heat transfer performance under the same flow rate;under the same flow channel,choosing the appropriate inlet flow rate not only helps to improve the heat dissipation performance of the water cooling plate It can also effectively reduce the operating power consumption of the system and extend its service life.Through the design simulation of the water cooling plate of the reactor,it is found that compared with the water cooling plate of the O type flow channel and the U type flow channel,the S type flow channel water cooling plate has the characteristics of no internal high temperature difference,higher coolant flow rate,and better heat dissipation.4.According to the simulation analysis results of the heat dissipation performance of the reactor water-cooled plate,relevant experiments were conducted to influence the heat dissipation performance of the reactor water-cooled plate.In this paper,the heat dissipation performance of water cooling plates in different channels is tested through experiments to verify the accuracy of the research results.Experiments show that the maximum temperature of the Schannel water cooling plate is 29.5℃ at the same time,which is 4.4 ℃ and 2.7 ℃ lower than that of the U-channel water cooling plate and the O-channel water cooling plate,respectively.The S-channel water cooling plate can quickly make The overall temperature of the watercooled plate is in a low and controllable range.