| 摘要 |
<p>A system including a frequency shifted proportional-integral (PI) controller system utilizing input band-shifting, a PI control architecture and inverse band-shifting is disclosed. The frequency shifted PI controller system may eliminate errors and/or take control action based on past and present control errors. The feedback signal (75) may be multiplied times sine of the theta position (50) of the frequency of interest and the feedback signal (75) may be multiplied times cosine of the theta position (50) of the frequency of interest. Stated another way, the initial feedback signal (75) is parsed into sine and cosine components at a particular frequency. This effectively band-shifts the feedback signal for treatment by the PI controller.</p> |
