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Active Power Filter Control Strategy With Implicit Closed-Loop Current Control and Resonant Controller
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DOI：10.1109/TIE.2012.2196898.png)
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Abstract
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Novel simple indirect control concepts for an active power filter (APF) application are proposed here. The concepts are exemplarily presented to control a modified APF structure. The main advantage over other control strategies is the achieved excellent simplicity-to-performance ratio. The proposed control strategies are based on the concept of virtual impedance emulation to provide high power factor in a system. To validate the operating principle, a single-phase low-power prototype has been built and experimentally tested. This prototype operates at a remarkably low switching frequency of 5 kHz and is digitally controlled by a digital signal processor.
Keywords:
Active power filter (APF)
dc-ac converters
implicit control
sensorless control techniques
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