适用于兆瓦级多模块变流器的新型有源阻尼控制设计方法

钱为; 刘洪德; 吴扣林; 袁庆伟; 谢晔源

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

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分布式能源 ›› 2025, Vol. 10 ›› Issue (3) : 23-30. DOI: 10.16513/j.2096-2185.DE.24090676

学术研究

适用于兆瓦级多模块变流器的新型有源阻尼控制设计方法

作者信息 +

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

Author information +

文章历史 +

摘要

兆瓦级多模块变流器通常采用在交流侧集中布置滤波电容器的方式构建LCL滤波器，其系统稳定性受到控制装置与功率模块之间通讯延时及功率模块数量变化的影响，传统有源阻尼设计方法难以保证稳定运行。为此，提出了一种新型有源阻尼设计方法。该方法在离散域中建立了考虑通讯传输延迟的变流器有源阻尼等效控制模型，并引入等效传递函数根轨迹法。在不同通信延时和功率模块数量下进行有源阻尼反馈系数与准谐振控制器参数设计，并分析其对变流器参数选择和设计的影响。通过仿真和实验验证了所提方法的有效性，该有源阻尼设计可以快速获得大功率变流器稳定运行所需的控制参数，从而提升了装备研发效率。

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.

导出引用

钱为, 刘洪德, 吴扣林, 等. 适用于兆瓦级多模块变流器的新型有源阻尼控制设计方法[J]. 分布式能源. 2025, 10(3): 23-30 https://doi.org/10.16513/j.2096-2185.DE.24090676

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

中图分类号： TM46

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https://doi.org/10.12096/j.2096-4528.pgt.22141

摘要

LCL型并网逆变器是分布式发电与电网实现能量双向流动的重要装置，其电流控制方法通常需要多个电压电流传感器实现有源阻尼及并网电流控制，而这会增加系统成本。提出一种基于状态重构准谐振扩张状态观测器的全状态观测系统，只需一个逆变器侧电感电流传感器即可实现对所需状态变量的实时观测。通过在扩张状态观测器中每个状态变量的观测通道添加准谐振环节，解决传统扩张状态观测器跟踪正弦信号需要高观测器增益问题。同时，针对在dq轴坐标系下的并网电流控制存在强耦合问题，设计了将耦合项作为总扰动当中一部分的自抗扰电流控制器，简化了传统电流控制当中复杂的解耦过程。软件数值仿真结果表明，该控制策略表现出良好的观测效果及电流跟踪效果。

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