A Robust DC-Link Voltage Control Strategy to Enhance the Performance of Shunt Active Power Filters Without Harmonic Detection Schemes - 2015
Shunt active power filters (SAPFs) implemented while not harmonic detection schemes are vulnerable to sudden load variations. This paper proposes a strong control strategy to scale back this disadvantage. In this strategy, the dc-link voltage is regulated by a hybrid management technique combining a standard proportional-integral PI and a sliding-mode (SM) controllers. The SM scheme continuously determines the gains of the PI controller primarily based on the management loop error and its spinoff. The chattering because of the SM theme is reduced by a transition rule that fixes the controller gains when steady-state condition is reached. This controller is termed as twin-sliding-mode-proportional-integral. The phase currents of the power grid are indirectly regulated by double-sequence controllers with two degrees of freedom, where the internal model principle is employed to avoid reference frame transformation. The proposed control strategy ensures zero steady-state error and improves the performance underneath laborious transients like load variation. Additionally, it presents robustness when the SAPF is working underneath unbalanced conditions. Experimental results demonstrate the performance of the proposed management theme.
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