三电平逆变器驱动双定子绕组PMSM系统容错控制

为了提高三电平逆变器驱动双定子绕组永磁同步电机(PMSM)系统的运行能力,设计了一种针对缺相故障和开关管开路故障的新型容错控制策略。新方案基于矢量空间解耦(VSD)控制实现了2套定子绕组的整体转矩控制。新方案可以实现优化目标下的缺相故障容错控制,如最小电流幅值方差。此外,针对开关管开路故障提出了基于VSD的补偿方案,即通过调整开关调制策略,实现了系统对称运行。新型容错控制方案还能抑制电流谐波和直流母线中点电压偏差。最后,PMSM容错试验结果验证了新型控制方案的有效性。

Fault Tolerant Control of Dual Stator Winding PMSM System Driven by Three-level Inverters

In order to improve the running ability of three-level inverter-driven permanent magnet synchronous motor(PMSM)system with double stator windings,a novel fault-tolerant control strategy for open-phase faults and open-switch faults was designed.The new scheme realized the integral control of the torque of the two sets of stator windings based on vector space decomposition(VSD)control.The new scheme could achieve open-phase fault tolerant control under the optimization goal,such as minimum current amplitude variance.In addition,a compensation scheme based on VSD was proposed for open-switch faults,that is,by adjusting the switching modulation strategy,the system was operated symmetrically.The current harmonics and DC bus neutral point deviation could be suppressed by the new fault tolerant control strategy.Finally,fault-tolerance test results of the PMSM verify the effectiveness of the new control scheme.