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\title{Broadband Harmonic Oscillation Suppression Strategy for Distribution
Networks with High Penetration of Distributed Generation Using
Direct-Mounted Damping Devices}



\author[1]{Chengjia Bao}%
\author[2]{Tong Zhang}%
\author[1]{Yonggang LI}%
\author[3]{Tianyi Zhang}%
\author[2]{Jianwen Li}%
\author[1]{Rong Li}%
\affil[1]{North China Electric Power University}%
\affil[2]{North China Electric Power University - Baoding Campus}%
\affil[3]{State Grid Gansu Electric Power Company}%


\vspace{-1em}



  
  \date{April 25, 2026}


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\begin{abstract}
In power systems with high penetration of distributed generations (DGs),
multi-modal broadband harmonic oscillations pose a serious threat to
secure and stable operation. Existing active and passive damping methods
are limited in their capability to effectively suppress resonance peaks.
Considering background harmonics and system impedance characteristics,
this paper proposes a novel direct-mounted damping device to suppress
broadband harmonic oscillations in the distribution network. In
accordance with IEC specified electromagnetic compatibility standards
for low-voltage grids, a unified quantitative indicator for broadband
oscillation analysis is established. Additionally, a general procedure
for damping device parameter design is developed based on modal analysis
and the particle swarm optimization (PSO) algorithm. Simulation results
show that the proposed topology achieves superior broadband oscillation
suppression. Experiments on a multi-inverter grid-connected system
further demonstrate the generality and effectiveness of the proposed
method in suppressing multi-modal broadband harmonic oscillations within
high-DG-penetration distribution networks.%
\end{abstract}%



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