SVPWM电压源逆变器供电异步电动机容错性的时域和频域分析

Time and Frequency Domain Analysis of Fault-tolerant Space Vector PWM VSI-fed Inductor Motor Drive

研究了一种新的空间矢量调制方法,使利用电压源逆变器供电的异步电动机具有容错性。新的方法运用2种不同的空间矢量调制策略,使电机从正常运行切换到故障运行。文中提出的用于故障运行的调制方法与传统的B6型逆变器有着相同的对称性。时域和频域的理论分析结果建立在拉普拉斯电压空间矢量转换基础上。理论分析计算的波形与试验结果十分吻合。因此,提出的解析模型为不平衡及平衡电源条件下一种非常有用的供电分析方法。

The use of a new space-vector modulation strategy for a voltage source inverter supplying a fault tolerant induction motor drive is investigated. Such a system uses two distinct space-vector modulation strategies to switch from the healthy to the faulty operation. The proposed modulation strategy for the faulty operation has the same symmetry as in a classical B6 inverter. The purely analytical results both in the time and frequency domain are based on the Laplace transform of the voltage space vectors. There is an excellent agreement between the analytically calculated waveforms and the experimentally determined ones. Therefore, the proposed analytical model becomes a very useful method under unbalanced, as well as balanced, supply conditions.