An LCL-LC Filter for Grid-Connected Converter: Topology, Parameter, and Analysis

In order to further cut down the cost of filter for grid-connected pulsewidth modulation (PWM) converter under the more and more stringent grid code, a new kind of high-order filter, named LCL-LC filter, is presented in this paper. The resonant frequency characteristics of the filter are analyzed, a...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2015-09, Vol.30 (9), p.5067-5077
Main Authors: Li, Fei, Zhang, Xing, Zhu, Hong, Li, Haoyuan, Yu, Changzhou
Format: Article
Language:English
Subjects:
Comparative analysis
Electrical design
Electricity distribution
Frequencies
Harmonic analysis
Inductors
Iterative methods
LCL filter
LCL-LC filter
Parameter design
Parameter robustness analysis
Power harmonic filters
Prototypes
Resonant frequency
RLC circuits
Robustness
Switching frequency
Transformers
Trap filter
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Summary:In order to further cut down the cost of filter for grid-connected pulsewidth modulation (PWM) converter under the more and more stringent grid code, a new kind of high-order filter, named LCL-LC filter, is presented in this paper. The resonant frequency characteristics of the filter are analyzed, and a parameter design method on the base of the characteristics is also proposed in the paper. The proposed parameter design method can easily make full use of the existing research results about the traditional LCL filter parameter design. And then a parameter robustness analysis method based on four-dimensional graphics is proposed to analyze parameter robustness of the presented filter. Compared with the traditional one, the proposed analysis method can analyze the filter performance under variations of several parameters at a time without any iteration. The comparative analysis and discussion considering the LCL filter, the trap filter, and the LCL- LC filter, are presented and verified through the experiments on a 5 kW grid-connected converter prototype. Experiment results demonstrate the accuracy of theoretical analysis and prove that the presented filter has a better performance than two others.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2014.2367135