Jun 02, 2014 - 02:00 PM
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1. DQ0 transformation: the da0 transformation is different with the theory. I think this is an error long time ago made by our programmer. The q axis is on the opposite direction. In order to correct this error, there is an item “Offset angle to PLL (rad/deg as per Pmode)” in the PLL, the angle is set as 90 degree. Because the PLL corrects this error, it would not have any impact on the simulation.
2. The PI controller design: there is no straight way to determine the PI value. The traditional way is root locus analysis of the transfer function or small signal analysis. We usually give the value by experience.
Please let us know if you have further questions.
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