A Novel Control Design Method of Active Damping for Multi-Module Converter at Megawatt Level

Wei QIAN; Hongde LIU; Koulin WU; Qingwei YUAN; Yeyuan XIE

doi:10.16513/j.2096-2185.DE.24090676

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Distributed Energy ›› 2025, Vol. 10 ›› Issue (3) : 23-30. DOI: 10.16513/j.2096-2185.DE.24090676

Basic Research

A Novel Control Design Method of Active Damping for Multi-Module Converter at Megawatt Level

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Abstract

The LCL filter is usually constructed by centrally deploying filter capacitors on the AC side of the megawatt multi-module converter. The stability of the system is affected by the communication delay between the control device and the power module and the number of power modules，and the traditional active damping design method is difficult to ensure stable operation. Therefore，a new design method of active damping was proposed. In this method，the equivalent active damping control model of the converter considering the communication transmission delay was established in the discrete domain，and the equivalent transfer function root locus method was introduced. The active damping feedback coefficient and quasi-resonant controller parameters were designed under different communication delays and power modules，and their influence on the selection and design of converter parameters was analyzed. The effectiveness of the proposed method was verified by simulation and experiment. The active damping design can quickly obtain the control parameters required for the stable operation of the high-power converter，thereby improving the efficiency of equipment development.

Key words

multi-module converter / centralized arrangement of filtering capacitors / communication transmission delay / root locus of equivalent transfer function / discrete domain / active damping

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Wei QIAN , Hongde LIU , Koulin WU , et al . A Novel Control Design Method of Active Damping for Multi-Module Converter at Megawatt Level[J]. Distributed Energy Resources. 2025, 10(3): 23-30 https://doi.org/10.16513/j.2096-2185.DE.24090676

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Abstract

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