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A Comparative Study of Stationary Frame and Fixed Switching Frequency Digital Current Control Techniques for Power Active Filters
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| Author(s) |
Amaia López de Heredia; Haizea Gaztañaga; Ion Etxeberria-Otadui; Seddik Bacha; Raúl Reyero |
| Abstract |
In this paper two stationary frame digital current control techniques, the RST/Deadbeat and the Multi-Resonant controller, are analysed and experimentally tested in an active filter application. The RST/Deadbeat controller has been tuned in order to obtain a deadbeat response. The method used to tune
the Multi-Resonant controller is based on a frequency response
approach that guarantees the stability and robustness of the
system. It is well-known that the performance of deadbeat
controllers is constrained to the accuracy of the plant model as
well as the accuracy of the reference and disturbance predictions. The accuracy of the Multi-Resonant controller is guaranteed as long as the system is stable and the harmonics of the reference and the disturbance coincide with the resonance frequencies of the controller.
Theoretically the main advantages of the deadbeat controller
are its simplicity and its dynamics. However, in a complex
application such as the active filtering the intrinsic delay of the
controller is unacceptable and therefore it is necessary to use
reference (and eventually disturbance) prediction techniques.
The use of these techniques can have a non-negligible effect on
the characteristics of the system and can be detrimental for both
the dynamics and the simplicity of the system. In this paper two
different prediction techniques have been implemented: periodicity and resonant. It is shown that the steady-state performances in both cases are satisfactory and similar to those
obtained with the Multi-Resonant controller. Nevertheless, the
first of the prediction techniques deteriorates significantly the
dynamic performance of the system while the second one increases considerably its complexity, showing that the Multi- Resonant controller is better adapted for this kind of applications than the studied deadbeat controller. |
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| Filename: | 261 |
| Filesize: | 817.8 KB |
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| Type |
Members Only |
| Date |
Last modified 2006-02-13 by System |
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