六相永磁同步发电机的容错控制

摘要

为了实现六相永磁同步发电机缺相后的矢量控制,根据定子磁动势不变原则,以定子铜耗最小为优化目标,分别对不同中性点连接方式下的六相永磁同步发电机缺两相的电流进行求解,对比了两者的优劣性.根据缺相后的变换矩阵,建立了缺两相时的六相永磁同步发电机的数学模型,并由此提出缺相后的解耦容错控制方法.为真实模拟发电机的缺相运行,建立了发电机从正常到缺相的统一模型,并通过切换控制策略,有效减少了缺相后的转矩脉动.仿真结果验证了统一模型的可行性和容错控制算法的有效性.%To realize the vector control of six-phase permanent magnet synchronous generator(PMSG) with open-phase circumstances,according to the invariant magnetic motive force of stator,the two-open -phase currents of six-phase PMSG were solved under different connecting modes of neutral point.Advan-tages and disadvantages of two modes were compared.Based on the open-phase transformation matrix, the mathematic model of two-open-phase six-phase PMSG was built.And then an open-phase decoupling fault-tolerant control method was built.To simulate the open-phase running of PMSG accurately,the uni-fied model from normal running to open-phase running was established.At the same time,through switc-hing control methods,the open-phase torque ripple was reduced effectively.Finally feasibility and effec-tiveness of unified model and fault-tolerant control method were verified by the simulation results.