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Erschienen in:
14.04.2023 | Originalarbeit
Repetitive controllers for shunt active power filters – control design, implementation and stability analysis
Erschienen in: e+i Elektrotechnik und Informationstechnik | Ausgabe 3-4/2023
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Abstract
To ensure power quality and to meet the grid standards, shunt active power filters based on voltage source inverters are widely used to compensate for fundamental reactive power and distortion power of non-linear loads, such as variable speed drives. For the compensation of the current harmonics, the well-known current control can be applied in multiple rotating frames via PI controllers or in the stationary frame via resonant controllers (or a combination of both). Since each harmonic is controlled by at least one controller, the computational effort rises proportionally to the number of harmonics to be compensated. An alternative control approach are repetitive controllers, which, in theory, offer the possibility to compensate for all harmonics through only one controller.
This paper discusses the application of repetitive controllers in the context of active power filters. It focuses on the control design, especially on the design of the low-pass filter used for the damping of the high-order poles of the transfer function of the repetitive controller, as well as on the implementation and stability analysis.