Wide-band Oscillation Suppression Method for Three-phase Grid-connected Inverter Based on Adaptive Oscillation Mode Change

JIAN Wenhao; 1; GAO Zhanjun; 1; LIU Yinglin; 2; QIN Chuan; 2; ZHANG Guangtao; 2; LEI Lei; 1

doi:10.13335/j.1000-3673.pst.2025.0585

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Wide-band Oscillation Suppression Method for Three-phase Grid-connected Inverter Based on Adaptive Oscillation Mode Change

更新时间：2026-03-13

- Wide-band Oscillation Suppression Method for Three-phase Grid-connected Inverter Based on Adaptive Oscillation Mode Change
- Vol. 49, Issue 10, Pages: 4028-4037(2025)
- 作者机构：
  
  电网智能化调度与控制教育部重点实验室(山东大学),山东省,济南市,250061
- 作者简介：
- 基金信息：
- DOI：10.13335/j.1000-3673.pst.2025.0585
  CLC： TM464
- Published：2025
- 稿件说明：
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JIAN Wenhao, 1, GAO Zhanjun, et al. Wide-band Oscillation Suppression Method for Three-phase Grid-connected Inverter Based on Adaptive Oscillation Mode Change[J]. 2025, 49(10): 4028-4037.
DOI：

JIAN Wenhao, 1, GAO Zhanjun, et al. Wide-band Oscillation Suppression Method for Three-phase Grid-connected Inverter Based on Adaptive Oscillation Mode Change[J]. 2025, 49(10): 4028-4037. DOI： 10.13335/j.1000-3673.pst.2025.0585.

摘要

目前提出的基于阻抗重塑的宽频振荡抑制方法一般只适用于某个频段，当电网阻抗改变时，振荡模态即振荡的主导频率和幅值发生变化，无法再有效地抑制振荡，且在抑制目标频段振荡的同时，会影响其他频段的阻抗特性，进而增加其他频段的振荡风险。为了解决上述问题，首先在三相并网逆变器的电流内环增加并网电压前馈，设计通道传递函数，实现较宽频段的逆变器阻抗重塑以适用多频段振荡。然后设计无相位偏移的FIR带通数字滤波器，并基于相位矫正消除滤波器离散采样频率对系统稳定性的影响。由FIR数字滤波器和电压前馈通道组成的振荡抑制通道可根据振荡模态来调整重塑序阻抗的频段，且不改变其他频段的阻抗特性。最后通过仿真验证了该方法的有效性、适用性。

Abstract

At present

the proposed broadband oscillation suppression method based on impedance remodeling is generally only applicable to a certain frequency band. When the grid impedance changes

the dominant frequency and amplitude of the oscillation mode change

and the oscillation can no longer be effectively suppressed. While suppressing the oscillation of the target frequency band

it will affect the impedance characteristics of other frequency bands

thereby increasing the risk of oscillation in those other frequency bands. To address the issues mentioned above

firstly

voltage feedback is introduced into the current inner loop of the three-phase grid-connected inverter

and the channel transfer function is designed to be applicable for realizing impedance remodeling of the inverter over a wider frequency band

thereby enabling multi-band oscillation. Then

a FIR band-pass digital filter without phase offset is designed

and the influence of the filter's discrete sampling frequency on system stability is eliminated based on phase correction. The oscillation suppression channel

composed of an FIR digital filter and a voltage feedback channel

can adjust the frequency band of the reshaping sequence impedance according to changes in grid impedance

without altering the impedance characteristics of other frequency bands. Finally

the effectiveness of the method are verified by simulation.

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