中文摘要：

自循环蒸发内冷系统具有无泵自循环、冷却效率高、运行安全可靠和基本免维护等特点,非常适合在风力发电机中应用。由于风力发电机的特殊结构,其蒸发内冷系统需要采用具有一定垂直高度差的多通道并联结构。在这种结构中,各通道中的运行参数各不相同且相互耦合、相互影响,诱发系统的不稳定问题,对发电机的安全运行十分不利。本文基于一维均相模型,建立了多通道并联系统的模型,推导了其动阻力平衡方程组。基于平衡方程组,运用静态分岔理论及其DERPAR数值分析方法分析了三通道系统的静态稳定性及其参数效应,为风力发电机蒸发内冷系统的结构设计提供理论基础。

英文摘要：

Natural circulation inner evaporative cooling system（ IECS） has the advantage of self-circulation without pump,high cooling efficiency,safe and reliable operation,basically maintenance free,etc. It is very suitable for application in wind turbines. Due to the special structure of the wind turbine,its IECS needs to use parallel channels with different vertical heights. In this structure,each channel has different operation parameters,coupling with each other and influencing each other,induces instability problem of the system,and it is very detrimental for the safe operation of the generator. In this paper,based on one-dimensional homogeneous model,the model of multichannel parallel system is established and the flow driving force and flow resistance balance equations are deduced.Based on the balance equations,static stability and its parameters effect of a three channel system are analyzed using the static bifurcation theory and DERPAR numerical analysis method. This can provide theoretical basis for the structure design of the IECS in wind turbines.