Impedance Characteristics and Harmonic Analysis of LCL-Type Grid-Connected Converter Cluster

Xiaojie Zhou, Dezhi Xu and Yourui Huang
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Xiaojie Zhou: School of Electrical and Electronic Engineering, Anhui Science and Technology University, Bengbu 233100, China
Dezhi Xu: School of Electrical Information Engineering, Jiangsu University, Zhenjiang 212013, China
Yourui Huang: School of Electrical and Electronic Engineering, Anhui Science and Technology University, Bengbu 233100, China

Energies, 2022, vol. 15, issue 10, 1-18

Abstract: This study addresses the output impedance model of the LCL-type grid-connected converter considering the dead-time effects and the digital control delay. The model shows that the digital control delay will affect the accuracy of the output impedance of the grid-connected converter, and the dead-time effects are only equivalent to superimposing a disturbance voltage on the original output impedance model. The derived output impedance model is verified by comparing it with the switching model in the PSIM simulation environment. The harmonic interaction between converter cluster and utility grid is modeled and analyzed based on the output impedance model. A combined harmonic suppression strategy is incorporated into every converter control scheme to suppress the harmonic interaction. Simulation results are presented to demonstrate the correctness of harmonic interaction analysis and the effectiveness of the proposed suppression strategy.

Keywords: converter cluster; LCL-type grid-connected converter; harmonic analysis; output impedance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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