大功率风力发电机冷却系统的试验研究及数值模拟

Experimental study and numerical simulation on powerful wind turbine cooling system

冷却系统是风力发电系统的重要组成部分,其性能的优劣是衡量发电机能否安全可靠运行的重要因素。文章针对某型3 MW风力发电机的冷却问题,搭建了风力发电机试验台,研究了100%负载条件下冷却系统的性能表现,并采用数值模拟方法对其进行分析,提出了4种优化方案:1增大乙二醇流量;2降低乙二醇进口温度;3增大空气流量;4采用空心导线冷却方式。试验和模拟结果表明:电机在100%负载条件下温度高于电机所要求的工作范围,需要对冷却系统进行优化;空心导线冷却方式能对电机高温区域进行集中冷却,使温升符合电机工作要求,是冷却系统的最佳优化方案。文章的研究方法和研究结果可为我国风力发电机冷却系统的相关研究提供试验和理论参考。

Cooling system is an important component of wind turbine system, the performance of which is a significant measurement of generator that whether it would be in safe and reliable opera- tion. In this paper an experimental bench was established and a cooling performance of 3 MW wind turbine cooling system under 100% load condition was studied. And then numerical method was ap- plied to propose optimization solutions such as increasing fhe flow of ethylene glycol, reducing gly- col inlet temperature, increasing air flow rate and using hollow wire cooling method. The result of experimental study shows that the temperature of 100% load experiment exceeded the range of work- ing requirement, therefore system optimization is needed. Hollow wire cooling method is the optimal solution and it has good performance in the high-temperature region, which can meet the design re- quirement of generator. Research methods and conclusions of this paper will provide reference value for experimental and theoretical studies of wind turbine cooling system.