大型永磁风力发电机绕组短路主保护配置方案研究

摘要

An appropriate main protection configuration scheme for stator winding is a key to safe and reliable operation of large generator. In this paper, the types and quantities of internal short circuit faults in large-sized permanent magnet synchronous wind turbines are analyzed. Statistics is done for fault type, location and quantity of GW82-1500 type permanent magnet synchronous wind turbine. Then, the finite element method is used to calculate the current of each phase and branch, the sensitivities of multiple kind of differential protection schemes are analyzed and calculated, and the dead zone location of the main protection device is obtained. On the basis of analysis aforementioned, a main protection scheme of GW82-1500 generator is proposed.%定子绕组短路主保护配置方案的选择是大型发电机安全可靠运行的前提.文章首先分析了大型永磁风力发电机定子绕组短路故障类型和数目,主要是对GW82-1500永磁风力发电机绕组的故障类型、位置和数目做出统计.然后通过有限元法,计算出发电机绕组短路时各相及各分支电流,进而对各种差动保护的灵敏度进行分析计算,得出主保护装置动作时易致保护死区的位置.根据匝间短路和相间短路的分析结果,总结了灵敏度变化规律,在此基础上,提出了GW82-1500发电机绕组主保护配置方案.