双馈风力发电机多种故障状态温度场仿真研究

Simulation Study on Multiple Fault States Thermal Field about DFIG in Wind Power

研究双馈风力发电机温度场优化测量问题。针对温度场不便测量和故障的多样性,为改善多工况运行时发生多种短路故障的温度场测量精度。提出利用有限元法建立全区域模型,在电磁场计算基础上耦合进行温度场计算。计算了1.5MW发电机正常运行及多种故障发生时的温度场,并把仿真数据和现场温升实验测量数据进行对比。结果表明,可确定发电机最高温度值及部位、绝缘材料性能改进对温度的影响,对单相短路故障判定良好,匝间短路故障较难判别。经实验证明,改善了目前温度场不便全面直接测量的问题,仿真分析对温度场优化、故障预测、结构优化有较大意义。

Thermal field optimization and calculation are important to Doubly -fed Induction Generator （DFIG）. Aiming to the problem that current status of thermal field measuring is inconvenient and the faults of generator is vari- ous, to improve thermal field calculation precision of multiple operating condition and multiple short - circuit fault happened, a Finite element method （FEM） was put forward, an all -region model was set up, and thermal field was calculated on the basis of electromagnetic field calculation. The 1.5MW generator thermal field of normal and the multiple fault operating condition were calculated. Then the simulated data and the measured data from temperature rising experiment on the site were compared. Simulation results show that it can improve the problem that it is incon- venient to comprehensively measure thermal field directly.