基于多场耦合的风电机组熵产极小化分析

Entropy Generation Minimization Analysis of Wind Turbines Based on Multi Field Coupling

针对永磁风电系统产能效率低、输出稳定度不高等问题,综合考虑损耗热功及换热性能,视风电机组为孤立系统,并基于熵增原理建立熵产模型,结合有限体积元分析结果并运用场协同理论,进行热功产生及扩散过程中熵产率动态分析,进而探究损耗与传热特性、流-热-磁三场耦合机理及熵产率分布规律。最终以极小熵产率为目标,通过调节来流风速、机组偏航角、齿槽结构及定、转子间气隙长度等关键影响因素,确定机组最佳运行工况及磁-热结构,提出风电机组极小熵产率优化方案。

The problem of low productivity and low output stability of permanent magnet wind power system was aimed at in this research.The loss of heat and heat transfer performance was considered,and the wind turbine was regarded as an isolated system.Entropy entropy production model was established.The dynamic process of thermal power generation and diffusion entropy generation was analyzed.The loss,the heat transfer characteristics,the three field coupling mechanism and the entropy production rate distribution law were studied.Finally,the minimum entropy production rate was taking as the target.The optimal operating conditions and the magnetic thermal structure of the unit were determined by adjusting the key factors,such as the incoming wind speed,the yaw angle of the unit,gap structure and air gap length between stator and rotor and so on.The minimum entropy production rate optimization scheme of the wind turbine was proposed.