Abstract
This study proposes a flexible active power filter (APF) controller operating selectively to satisfy a set of desired load performance indices defined at the source side. The definition of such indices, and of the corresponding current references, is based on the orthogonal instantaneous current decomposition and conformity factors provided by the conservative power theory. This flexible approach can be applied to single- or three-phase APFs or other grid-tied converters, as those interfacing distributed generators in smart grids. The current controller is based on a modified hybrid P-type iterative learning controller which has shown good steady-state and dynamic performances. To validate the proposed approach, a three-phase four-wire APF connected to a non-linear and unbalanced load has been considered. Experimental results have been generated under ideal and non-ideal voltage sources, showing the effectiveness of the proposed flexible compensation scheme, even for weak grid scenarios.
Highlights
The research on control techniques for active power filters (APFs) applicable to smart distribution grids and microgrids under non-sinusoidal and/or asymmetrical operations is motivated by the increasing percentage of power generated from primary energy sources interfaced through power electronics converters
The development of an APF controller highly depends on the adopted power theory, which directly impacts on the control strategy, filter design and compensation results
The conservative power theory (CPT) calculation could run into a low-frequency loop or in case of a three-phase APF, the phase equivalent conductance and reactivity [Gm and Bmfrom (2) to (5)] of each phase could be updated within a period of fundamental cycle
Summary
The research on control techniques for active power filters (APFs) applicable to smart distribution grids and microgrids under non-sinusoidal and/or asymmetrical operations is motivated by the increasing percentage of power generated from primary energy sources interfaced through power electronics converters. APFs compensating unwanted load current components have been subject of extensive studies during the past 30 years The contributions to this literature range from type of filters [1], filter topologies [2, 3] design of passive and active elements [4, 5], controller schemes [6,7,8], control strategies [9,10,11], power theories applied to active compensation [12,13,14], selective and flexible compensation objectives [15,16,17,18,19] and non-ideal voltage operation [20, 21]; these last two are the focus of this paper. P−q and id−iq control strategies are sensitive to voltage non-idealities and their results are difficult to be analysed under distorted and asymmetric voltage conditions [9, 15, 24]
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