Broadband Harmonic Oscillation Suppression Strategy for Distribution Network with High Penetration of Distributed Generation based on Magnitude-Frequency Corrector
Li Rong1,2, Li Jianwen1,2, Li Yonggang1,2
1. Yanzhao Electric Power Laboratory of North China Electric Power University Baoding 071003 China 2. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Baoding 071003 China
Abstract：In power systems with high renewable penetration and high power-electronics integration (“dual-high”), multi-modal broadband harmonic oscillations pose a serious threat to secure and stable operation. Station-level shunt-based passive damping methods are independent of source-side topology and parameters, providing stronger targeting capability and greater flexibility. However, existing approaches primarily constrain the phase of the original system impedance, with limited impact on suppressing resonance peak magnitudes. Accordingly, directing particular attention to the magnitude-frequency characteristics of the port impedance, with the explicit objective of attenuating resonance peak magnitudes, could enable strategic reshaping of the system impedance via shunt devices, providing a promising means of mitigating broadband harmonic oscillations caused by the interaction between background harmonics and the impedance network. In “dual-high” systems, multi-modal resonance peaks arise from the coupling of multiple LC passive networks. These peaks correspond to the eigenvalues of the impedance transfer function, and the associated damping coefficients quantitatively characterize the relative strength of the suppression effect. However, damping coefficients are jointly constrained by system structure, electrical parameter distribution, and energy dissipation mechanisms, making it difficult to set a unified value; therefore, they should be determined based on actual operating conditions. Based on a comparative analysis of three commonly used passive oscillation suppression devices, this paper proposes a novel topology—magnitude-frequency corrector (MFC). The port characteristics of the proposed device are complementary to those of a multi-inverter grid-connected system. Proper design of the inductance and capacitance parameters of the MFC, combined with parallel connection at the system’s key nodes, can weaken the broadband inductive characteristics of the original system’s port impedance, thereby suppressing resonance peaks. In alignment with IEC specified electromagnetic compatibility standards for low-voltage distribution networks, a unified quantitative indicator for broadband oscillation analysis is established and adopted as the objective function for MFC parameter optimization. Modal analysis method is used to identify key nodes for oscillation suppression, and Particle Swarm Optimization (PSO) is applied to optimize parameters. Comparison of the system’s frequency response curves before and after MFC integration demonstrates that the MFC effectively suppresses multi-modal resonance peaks. Simulation results confirm that incorporating the shunt MFC enhances the system’s capability to actively suppress harmonic oscillations. 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 in “dual-high” distribution networks. The main contributions and conclusions of this paper are as follows: 1)A unified quantitative indicator for broadband oscillation analysis is established: in low-voltage distribution networks with relatively low even-order harmonic content, if all resonance frequencies are close to even-order harmonics, a damping coefficient of ξ ≥ 0.2 would be sufficient to comply with the harmonic limit requirements for the grid connection of distributed generation. 2)A parameter design method for the MFC targeting suppression of multi-modal resonance peaks is proposed: modal analysis method identifies key nodes for oscillation suppression, and PSO is employed to obtain optimal parameters for improving the system damping. 3)The feasibility of reshaping the system impedance based on port impedance magnitude-frequency characteristics using station-level shunt passive devices is verified: connecting the MFC in parallel at the system’s key nodes effectively suppresses multi-modal resonance peaks, significantly improves system damping, and shifts resonance frequencies, all without affecting fundamental-frequency operation. This enables effective suppression of broadband oscillations induced by the integration of multiple inverters.
李戎, 李建文, 李永刚. 基于幅频校正器的“双高”配电网宽频谐波振荡抑制策略[J]. 电工技术学报, 0, (): 250394-.
Li Rong, Li Jianwen, Li Yonggang. Broadband Harmonic Oscillation Suppression Strategy for Distribution Network with High Penetration of Distributed Generation based on Magnitude-Frequency Corrector. Transactions of China Electrotechnical Society, 0, (): 250394-.
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