1000MW水轮发电机定子空冷和蒸发冷却方式的对比分析

Comparison and analysis of stator's air cooling and evaporative cooling method of 1000MW hydrogenerators

白鹤滩水电站是金沙江下游水电开发的第二个梯级电站,计划装设14台单机容量为1000MW的机组。目前全球范围内没有该容量机组的设计、制造经验,其中冷却方式的选型是一个非常关键的问题。本文首先依据该机组的基本参数分别提出了定子空冷和蒸发冷却初步电磁方案的设计,并在此基础上开展了电磁场的相关仿真并获取热源分布;其次,开展了两种方案的三维温度场仿真,从电机尺寸、材料消耗、介质用量以及热性能等多方面全面对比了两种冷却方案,为未来发电机招标冷却技术的选型提供有价值的参考。

Baihetan hydropower station has 14 hydrogenerators with the unit capacity of 1000MW.On a global scale, there are no experiences on design and manufacture of such huge hydrogenerators .There are a lot of techni-cal problems to be solved , among which the selection of cooling mode is a very key problem .Firstly, this paper put forward the general electromagnetic scheme of the air cooling and evaporative cooling hydrogenerators .Based on it , we carried out the simulation of the electromagnetic field and got the distribution of the heat source .Secondly , we carried out the simulation of the 3-D temperature field for the stator of generator with two kinds of cooling modes re-spectively.Finally, we made comprehensive characteristic comparison between these two cooling methods from the aspects of unit size , material consumption , the quantity of coolant usage and thermal performance , and the compar-ison provides valuable reference for the future selection of cooling mode in the Baihetan unit bid .