NDLI: Design of LCL-filters with LCL resonance frequencies beyond the Nyquist frequency for grid-connected inverters

Content Provider	IEEE Xplore Digital Library
Author	Yi Tang Wenli Yao Poh Chiang Loh Blaabjerg, F.
Copyright Year	2015
Description	Author affiliation: Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore (Yi Tang) \|\| Dept. of Energy Technol., Aalborg Univ., Aalborg, Denmark (Wenli Yao; Poh Chiang Loh; Blaabjerg, F.)
Abstract	This paper proposes a novel LCL-filter design method and its current control for grid-connected converters. With the proposed design method, it is possible to set the resonance frequency of the LCL-filter to be higher than the Nyquist frequency, i.e. half of the system sampling frequency, and this observation is so far not discussed in the literature. In this case, very cost-effective LCL-filter design can be achieved for grid-connected converters whose dominant switching harmonics may appear at double of the switching frequency, e.g. in unipolar modulated three-level full bridge converters and 12-switch based three-phase pulse-width modulated (PWM) converters. Moreover, a single-loop current control strategy is proposed for the designed LCL-filter, and the control system is inherently stable without introducing any passive or active damping. Experimental results, showing the high quality output current and excellent resonance attenuation are presented in the paper, which are also in very good agreement with those simulated ones. These results successfully verify the feasibility of the proposed LCL-filter design and its current control.
Starting Page	5137
Ending Page	5144
File Size	653367
Page Count	8
File Format	PDF
e-ISBN	9781467371513
DOI	10.1109/ECCE.2015.7310384
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-09-20
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Current control LCL-filter Frequency modulation Resonant frequency Resonance frequency Frequency conversion Harmonic analysis Active damping Nyquist Frequency Frequency control Power harmonic filters
Content Type	Text
Resource Type	Article

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