| 摘要 |
PROBLEM TO BE SOLVED: To quickly select an output vector closest to a voltage command vector by calculating coordinate values of voltage command vector in oblique coordinates and also making some additional calculations. SOLUTION: By an oblique coordinate converter 49, a voltage command vector converted by a rotatory coordinate converter 48 is converter to an oblique coordinates on a vector diagram in an oblique coordinate system, and an output vector closest to this voltage command is determined. Then, the region of measure where the voltage command vector converted by oblique coordinate converter 49 exists is determined by region judgment and an oblique vector selector 50, and the coordinates of the output vector in the oblique system are calculated. By doing this, it becomes possible to quickly select the output vector closest to the voltage command vector. As a result, it becomes possible to execute the PWM control by space vector comparison at a high speed, also response performance of the power conversion equipment can be improved and the waveform can be enhanced. |
