在水-氢-氢冷汽轮发电机频繁调峰运行下，由于转子绕组的温度长期反复变化，且受到热应力作用，导致绕组和匝间绝缘发生形变，直接影响发电机的性能和稳定性，因此研究变工况下转子绕组的温度分布规律和热变形规律十分重要。以一台600 MW的水-氢-氢冷汽轮发电机为研究对象，根据其转子结构，确定旋转状态下的计算域，并建立三维电-热-流耦合计算模型。在相应的基本假设条件和边界条件下，计算得到了转子温度场和流体场分布，对比实测结果验证了仿真计算的准确性。将转子温度场结果作为热载荷，添加相应的边界条件，计算得到变工况下转子绕组的热变形，进一步总结得出热变形规律。

Under the frequent peaking operation of water-hydrogen-hydrogen cooled turbo-generator, the temperature of the rotor winding changes repeatedly for a long time and is subjected to thermal stress, which leads to deformation of winding and inter-turn insulation, and directly affects the performance and stability of the generator, so it is very important to study the temperature distribution law and the thermal deformation law of the rotor winding under the variable operating conditions. A 600 MW water-hydrogen-hydrogen cooled turbo-generator is taken as the object of study, according to the rotor structure, the calculation area under the rotating state is determined, and a three-dimensional electric-heat-fluid coupling calculation model is established. Under the corresponding basic assumptions and boundary conditions, the temperature field and fluid field distribution of the rotor are calculated, and the accuracy of the simulation calculations is verified by comparing the measured results. The results of the rotor temperature field are taken as thermal loads, and the corresponding boundary conditions are added to calculate the thermal deformation of the rotor winding under variable operating conditions, and the thermal deformation law is further summarized.

中国华电集团有限公司“揭榜挂帅”项目(CHDKJ22-01-108)