宽调速范围内基于模块化多电平变换器的感应电机驱动子模块平衡运行

Operation of the conventional modular multilevel converter (MMC) at low frequencies for the induction motor drive is difficult. The peak-to-peak voltage ripple of submodule (SM) capacitor increases abnormally at low frequencies of the drive. Recently, the problem of high voltage ripple has been solved by using back-to-back MMC without overloading the converter till very low frequency of the drive....