High Performance Current Controller for Selective Harmonic Compensation in Active Power Filters

A new current control scheme for selective harmonic compensation is proposed for shunt active power filters. The method employs an array of resonant current controllers, one for the fundamental, and one for each harmonic, implemented in fundamental reference frame in order to reduce the overall comp...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2007-09, Vol.22 (5), p.1826-1835
Main Authors: Lascu, C., Asiminoaei, L., Boldea, I., Blaabjerg, F.
Format: Article
Language:English
Subjects:
Active control
Active filters
Active power filters (APFs)
Applied sciences
Arrays
Capacitors. Resistors. Filters
Circuit properties
Circuits
Compensation
Current control
Design engineering
Design methodology
Electric currents
Electric, optical and optoelectronic circuits
Electrical engineering
Electrical engineering. Electrical power engineering
Electrical machines
Electrical power engineering
Electronic circuits
Electronics
Exact sciences and technology
Filtering
Frequency filters
Frequency response
harmonic compensation
Harmonics
Operation. Load control. Reliability
Optimal control
Power harmonic filters
Power networks and lines
Power system harmonics
Quantum computing
Regulation and control
Resonance
selective controller
Transfer functions
Various equipment and components
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Description
Summary:A new current control scheme for selective harmonic compensation is proposed for shunt active power filters. The method employs an array of resonant current controllers, one for the fundamental, and one for each harmonic, implemented in fundamental reference frame in order to reduce the overall computational effort. The proposed controller design is based on the pole-zero cancellation technique, taking into account the load transfer function at each harmonic frequency. Two design methods are provided, which give controller transfer functions with superior frequency response. The complete current controller is realized as the superposition of all individual harmonic controllers. The frequency response of the entire closed loop control is optimal with respect to filtering objectives, i.e., the system provides good overall stability and excellent selectivity for interesting harmonics. This conclusion is supported by experimental results on a 7.6-kVA laboratory filter, indicating a reduction in current THD factor from 34% to 2%, while the highest harmonic compensated is the 37th harmonic current.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2007.904060