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


In order to further weigh down the price of filter for grid-connected pulsewidth modulation (PWM) converter underneath the additional and more stringent grid code, a replacement kind of high-order filter, named LCL-LC filter, is presented during this paper. The resonant frequency characteristics of the filter are analyzed, and a parameter style methodology on the bottom of the characteristics is additionally proposed in the paper. The proposed parameter style method will easily build full use of the prevailing analysis results about the traditional LCL filter parameter design. And then a parameter robustness analysis methodology primarily based on four-dimensional graphics is proposed to investigate parameter robustness of the presented filter. Compared with the ancient one, the proposed analysis method can analyze the filter performance under variations of several parameters at a time while not any iteration. The comparative analysis and discussion considering the LCL filter, the lure filter, and therefore the LCL- LC filter, are presented and verified through the experiments on a five kW grid-connected converter prototype. Experiment results demonstrate the accuracy of theoretical analysis and prove that the presented filter encompasses a better performance than two others.

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