特高压输电用同步调相机端部涡流损耗及流固耦合传热研究

Research on Eddy Current Loss and Fluid-solid Coupling Heat Transfer in the End Region of Synchronous Condenser for UHV Transmission

针对特高压输电用大型同步调相机端部复杂结构下漏磁、发热与冷却问题,结合调相机实际运行特点,建立三维瞬态电磁场数学模型,研究端部漏磁及各构件涡流损耗分布规律。通过构建调相机端部三维流固耦合传热模型,研究有限空间约束下端部通风系统冷却介质导流规律及屏蔽外空间和屏蔽内狭小空间的传热规律;进一步,探究不同冷却介质对端部新型双阶铜屏蔽、凸形压圈等结构的热表征影响。为了验证该文数值分析模型的合理性及计算方法的有效性,对调相机端部铜屏蔽内缘温度进行实测,温度计算结果与温度实测结果相吻合,为提升调相机通风冷却系统散热效力,选择最优冷却介质,以及研发更大容量的特高压输电用调相机冷却系统提供理论基础。

In order to solve the problems of magnetic flux leakage, heating and cooling in the end region of large synchronous condenser for ultra high voltage(UHV)transmission, a three-dimensional transient electromagnetic field mathematical model was established based on the actual operation characteristics of the synchronous condenser, and the distribution law of magnetic flux leakage in the end and eddy current loss of each component was studied. By constructing a three-dimensional fluid-solid coupling heat transfer model in the end of synchronous condenser, the heat transfer law of the cooling medium and the heat transfer law of the outer shielding space and the inner shielding narrow space of the lower ventilation system with limited space constraints were studied.Furthermore, the effects of different cooling media on the thermal characterization of the new dual stage copper shield and convex clamping plate were investigated. In order to verify the rationality of the numerical analysis model and the effectiveness of the calculation method, the temperature of the inner edge of the copper shield in the end of the synchronous condenser was measured. The temperature calculation results were consistent with the temperature measurement results. It provides a theoretical basis for the improvement of the cooling effectiveness of the synchronous condenser ventilation and cooling system, and the research and development of the synchronous condenser cooling system for UHV power transmission with larger capacity, and the selection of the optimal cooling medium.