一种具有抑制匝间短路失磁能力的永磁同步发电机

绕组匝间短路故障是永磁同步发电机(PMSG)最为常见的故障之一,容易造成永磁体的不可逆失磁。为了解决失磁问题,提出了一种具有抑制匝间短路下不可逆失磁能力的特种PMSG。首先介绍了发电机的特殊结构,紧接着通过数学模型推导出抑制失磁的原理。利用Flux软件建立发电机的模型,对发电机在运行过程中突然发生的匝间短路故障进行仿真。以永磁体各点在短路过程中出现的最小磁密值是否低于相应温度下退磁曲线的膝点磁密值为判断依据,分析得到发电机在不同短路故障下永磁体的失磁情况,从而验证了抑制失磁的可行性。

A Permanent Magnet Synchronous Generator with the Ability to Suppress the Interturn Short Circuit Demagnetization

Winding interturn short circuit fault is one of the most common faults of permanent magnet synchronous generator (PMSG), which usually causes irreversible demagnetization of permanent magnet. In order to solve the problem, a special PMSG with the ability to suppress irreversible demagnetization of the interturn short circuit is established. The special structure of the generator is introduced, and then the theory of suppressing demagnetization is explained through mathematic deduction. The model of the generator is established by Flux software and sudden interturn short circuit fault of the generator during the operation is simulated. The minimum magnetic flux density value at each point of the permanent magnet in the short circuit process is compared with the inflexion magnetic flux density of the demagnetization curve at the corresponding temperature. According to this, the demagnetization of permanent magnet under different short circuit faults is analyzed and the feasibility of suppressing demagnetization is verified.