Research on Full-band Oscillation Suppression Strategy for Hybrid Grid-forming/Grid-following Converter Systems

WEN Tianshu; ZHANG Chunjiang; ZHANG Kaixuan; WU Yangyang; MU Runzhi; ZHAO Hong

doi:10.13296/j.1001-1609.hva.2025.11.011

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Research on Full-band Oscillation Suppression Strategy for Hybrid Grid-forming/Grid-following Converter Systems

Parameter Optimization Design | 更新时间：2025-11-04

- Research on Full-band Oscillation Suppression Strategy for Hybrid Grid-forming/Grid-following Converter Systems
- High Voltage Apparatus Vol. 61, Issue 11, Pages: 118-128(2025)
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- DOI：10.13296/j.1001-1609.hva.2025.11.011
  CLC：
- Received：29 May 2025，
  
  Revised：2025-08-07，
  
  Published：16 November 2025
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WEN Tianshu, ZHANG Chunjiang, ZHANG Kaixuan, et al. Research on Full-band Oscillation Suppression Strategy for Hybrid Grid-forming/Grid-following Converter Systems[J]. High voltage apparatus, 2025, 61(11): 118-128.
DOI：

WEN Tianshu, ZHANG Chunjiang, ZHANG Kaixuan, et al. Research on Full-band Oscillation Suppression Strategy for Hybrid Grid-forming/Grid-following Converter Systems[J]. High voltage apparatus, 2025, 61(11): 118-128. DOI： 10.13296/j.1001-1609.hva.2025.11.011.

摘要

针对构网和跟网型变流器混合并网（异构变流器系统）仍存在振荡风险的问题，该研究首先基于谐波线性化理论建立了构网与跟网型变流器的阻抗模型，并对两种控制策略下的变流器阻抗特性差异进行了对比与分析。然后通过在跟网型控制电压前馈中级联二阶低通滤波器和构网型控制自适应阻尼的方法协同抑制异构变流器系统全频段范围可能产生的振荡，相比未加入协同抑制策略的异构变流器系统稳定裕度大幅提升，且异构变流器系统等效阻抗与电网阻抗之比满足奈奎斯特稳定性判据，降低了振荡发生的可能性。最后基于搭建的异构变流器半实物仿真模型验证了所提抑制策略的有效性。

Abstract

In view of the persistent oscillation risk in hybrid grid-forming and grid-following converter systems（heterogeneous converter systems），in this study the impedance models for both converter types using harmonic linearization theory are set up firstly，followed by a comparative analysis of their impedance characteristic difference under respective control strategies. Then，a coordinated suppression strategy is implemented through cascaded second-order low-pass filters in grid-following voltage feedforward paths combined with adaptive damping in grid-forming control to effectively mitigate full band oscillations in the heterogeneous system. Compared to the uncompensated system without collaborative suppression strategy，the approach significantly enhances stability margins while ensuring the grid-to-converter impedance ratio to meet the Nyquist stability criterion，thereby reducing oscillation occurrence probability. Finally，the effectiveness of the proposed suppression strategy is varified through a hardware-in-the-loop simulation platform for heterogeneous converter systems.

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