基于正负序矢量解耦控制的七相感应电机容错运行

现阶段多相电机已被各个领域广泛利用,在发生单相甚至若干相开路故障后,可以在不增加多余硬件的基础上确保多相电机维持平稳的运行。为了解决定子开路故障时空间谐波磁场耦合对电机转矩脉动的影响,本文提出了一种基于正负序矢量解耦控制的电机容错控制策略。以七相感应电机单相开路为例,引入对应的附加条件重新计算剩余各相电流。电流环采用双向比例积分控制算法,通过仿真在多相同步旋转坐标系下实现了对电流的无静差控制。最后通过实验对所提出的算法进行验证,表明该策略能保证故障前后基波磁动势不变,使电机在故障下获得较好稳态和动态性能。

Fault-tolerant Control of Seven Phase Induction Motor based on Positive and Negative Sequence Vector Decoupling Control

At present,multi-phase motors have been widely used in various fields.After the occurrence of one-phase or even several phases open circuit fault,the corresponding control algorithms and strategies can be selected to ensure the smooth operation of the multi-phase motor on the basis of no additional hardware.A fault tolerance control strategy based on positive and negative sequence vector decoupling control is proposed in this paper.Taking single-phase open circuit of seven phase induction motor as an example,the remaining phase current equations are recalculated by introducing the corresponding additional conditions.The current loop adopts bidirectional proportional integral control algorithm and realizes the current control without static difference under the multi-phase rotating coordinate system through simulation.The proposed algorithm is verified by experiments.It shows that the proposed strategy can effectively suppress the torque ripple and the basic wave magnetomotive force is guaranteed to be constant before and after the fault,the motor can obtain better steady and dynamic performance under the fault.