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The LQ controller for the 3-phase 4-leg inverter with an LC output filter - choosing the right reference frame
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| Author(s) |
Arkadiusz KASZEWSKI, Bartlomiej UFNALSKI, Lech GRZESIAK |
| Abstract |
In this paper three different implementations of the full-state feedback linear-quadratic (LQ) controllerfor a 3-phase 4-leg sine wave inverter are compared. The LQ controller is designed in stationary ref-erence frames $abc$ and $\alpha\beta\gamma$ as well as in $dq0$ reference frame rotating with the fundamental outputfrequency, and is not cascaded with any inner controller. In the proposed control schemes integral andmulti-oscillatory terms are added to the input of the LQ controller to ensure high quality output voltagewaveforms for unbalanced and nonlinear loads. All three approaches are tested in an experimental in-verter (a physical model at the level 10kVA). The experimental results for linear and nonlinear loads arepresented, discussed and some remarks on choosing the best reference frame are then given. |
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| Filename: | 0239-epe2013-full-16150431.pdf |
| Filesize: | 1.83 MB |
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| Type |
Members Only |
| Date |
Last modified 2014-02-09 by System |
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