Low Frequency Damping Enhancement Strategy of Grid-forming Converters Based on DC-link Voltage Synchronous Control

XIONG Xiaoling; LI Changsheng; LI Hang; LUO Bochen

doi:10.13334/j.0258-8013.pcsee.250152

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Low Frequency Damping Enhancement Strategy of Grid-forming Converters Based on DC-link Voltage Synchronous Control

更新时间：2026-10-05

- Low Frequency Damping Enhancement Strategy of Grid-forming Converters Based on DC-link Voltage Synchronous Control
- Vol. 46, Issue 3, Pages: 1144-1153(2026)
- 作者机构：
  
  新能源电力系统全国重点实验室(华北电力大学电气与电子工程学院)，北京市昌平区,102206
- 作者简介：
- 基金信息：
- DOI：10.13334/j.0258-8013.pcsee.250152
  CLC：
- Published：2026
- 稿件说明：
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XIONG Xiaoling, LI Changsheng, LI Hang, et al. Low Frequency Damping Enhancement Strategy of Grid-forming Converters Based on DC-link Voltage Synchronous Control[J]. 2026, 46(3): 1144-1153.
DOI：

XIONG Xiaoling, LI Changsheng, LI Hang, et al. Low Frequency Damping Enhancement Strategy of Grid-forming Converters Based on DC-link Voltage Synchronous Control[J]. 2026, 46(3): 1144-1153. DOI： 10.13334/j.0258-8013.pcsee.250152.

摘要

构网型换流器采用直流电压控制可以实现与交流电网的同步并控制直流电压稳定。然而基于直流电压同步的构网型换流器存在低频阻尼不足问题，导致系统低频振荡风险增加。文中通过建立基于直流电压同步的构网型换流器小信号分析模型，结合特征根分析法和有功幅相分析法揭示低频阻尼形成机理，发现有功反馈回路的负阻尼功率分量是系统存在低频振荡风险的关键原因；采用正阻尼支路构建的等效实现方法，提出无功功率前馈的低频阻尼增强策略。该策略在直流电压控制中引入无功功率前馈支路，有效降低了传统直流电压同步控制存在的低频振荡风险。最后，对构网型换流器在不同工况下进行实验验证，实验结果验证理论分析的正确性和低频阻尼增强策略的有效性。

Abstract

The grid-forming converter can synchronize with the AC power grid and maintain DC-link voltage stability by using DC-link voltage control. However

the low frequency damping problem of grid-forming converters based on DC-Link voltage synchronization increases the risk of low frequency oscillation. In this paper

a small signal analysis model of grid-forming converters based on DC-link voltage synchronization is established

and the formation mechanism of low frequency damping is revealed by combining eigenvalue analysis and active power magnitude-phase analysis. It is found that the negative damping power component of the active feedback loop is the key source for the risk of low frequency oscillation in the system. This paper employs an equivalent implementation method with a positive damping branch and proposes a low frequency damping enhancement strategy based on reactive power feedforward. The reactive power feedforward branch is introduced into DC-link voltage control

which effectively reduces the risk of low frequency oscillation in traditional DC-link voltage synchronous control. Finally

experiments are carried out to verify the grid-forming converter under different working conditions

and the experimental results demonstrate the correctness of the theoretical analysis and the effectiveness of the low frequency damping strategy.

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