【摘要】 介绍蒸发冷却技术在大功率整流装置中的应用,针对三峡700MW水轮发电机模型实验台所需的大功率直流电源,搭建壁挂式蒸发冷却三相不可控整流装置,测取大功率电力电子器件壳温随负荷的变化规律,计算大功率电子电子器件与介质间的热阻,并与国家标准中电力电子器件采用水冷方式的相关参数进行比较。由于蒸发冷却技术利用汽化潜热传热,与水冷采用单相液体传热相比,具有更高的换热系数,使大功率电力电子器件与环境间的热阻更小。对蒸发冷却散热器的仿真验证了仿真结果与实验测量结果的一致。研究表明,蒸发冷却技术应用于大功率整流装置中,具有可靠性高、噪声低、体积小、绝缘性好、冷却效率高等优越性。更多还原

【Abstract】 The application of the evaporative cooling technology in the high power rectifier devices is presented.Due to the requirement of high power DC power supply of the model experimental bench for 700 MW hydropower generator used in the Three Gorges hydropowerstation, a wall-mounted evaporative cooling three-phase bridge non-controlled rectifier is built up to measure the case temperature variation with load for high power electronic devices and calculate the thermal resistance between high power electronic devices and the medium, then compare the calculation results with related parameters of power electronic devices adopting water-cooling specified in national standard.Because the heat transfer mode based on latent heat of vaporization is applied to evaporative cooling technology, so it possesses higher coefficient of heat transfer than water-cooling using single phase liquid heat transfer, so it makes the thermal resistance between high power electronic device and environment lower.Simulation results of evaporative cooling radiator conform to the measured results in the experiments.Results of this research show that it possesses such advantages as high reliability, low noise, small size, good insulation performance and higher cooling efficiency to apply evaporative cooling technology in high power rectifier devices.更多还原