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

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4 Author(s)
Lascu, C. ; Univ. "Politehnica" of Timigoara, Timijoara ; Asiminoaei, L. ; Boldea, I. ; Blaabjerg, F.

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.

Published in:

Power Electronics, IEEE Transactions on  (Volume:22 ,  Issue: 5 )

Date of Publication:

Sept. 2007

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