Resonant suppression strategy of impedance remodeling for multi-inverter grid-connected system in weak grid

ZHANG Shicong

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Resonant suppression strategy of impedance remodeling for multi-inverter grid-connected system in weak grid

更新时间：2025-10-16

- Resonant suppression strategy of impedance remodeling for multi-inverter grid-connected system in weak grid
- Vol. 44, Issue 1, Pages: 9-19(2025)
- 作者机构：
  
  华北电力大学电气与电子工程学院,北京,102206
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM712
- Published：2025
- 稿件说明：
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ZHANG Shicong. Resonant suppression strategy of impedance remodeling for multi-inverter grid-connected system in weak grid[J]. 2025, 44(1): 9-19.
DOI：

ZHANG Shicong. Resonant suppression strategy of impedance remodeling for multi-inverter grid-connected system in weak grid[J]. 2025, 44(1): 9-19. DOI：

摘要

弱电网下多逆变器并网系统可能同时受到较大电网阻抗及背景谐波影响，电网阻抗较大导致逆变器与电网交互作用增强从而产生谐振问题，背景谐波进一步导致并网电压及电流波形畸变，使系统无法满足并网要求。鉴于此，文中建立弱电网下多逆变器并网系统阻抗模型，明确弱电网下并网电流波形畸变及谐振机理，进而提出一种适用于逆变器的改进电网电压前馈与并联自适应有源阻尼器结合的控制策略。利用改进电网电压前馈重塑多逆变器并网系统阻抗从而抑制背景谐波电压畸变的影响，利用有源阻尼器合成虚拟电阻以抑制系统与弱电网间的谐振，当系统工况变化时自适应调节虚拟电阻值并通过虚拟电阻补偿环节进一步改进阻尼效果。仿真结果表明所提策略能有效抑制背景谐波及并网系统谐振，提高多逆变器并网系统弱电网情况下的适应性。

Abstract

In weak grid

a multi-inverter grid-connected system may be simultaneously affected by large grid impedance and background harmonics. The interaction between inverter and grid is enhanced by the large grid impedance

resulting in resonance problems. Furthermore

the grid-connected voltage and current waveforms are distorted by the background harmonics

which makes the system unable to meet the grid-connected requirements. In view of this

firstly

an impedance model for multi- inverter grid-connected system is established

and the mechanism behind waveform distortion and resonance in weak grid is clarified. Subsequently

a control strategy combining improved grid voltage feedforward with parallel adaptive active damping is proposed. The improved grid voltage feedforward is used to reshape the impedance of the multi-inverter grid-connected system in order to mitigate background harmonics effects

while the active damper is employed to synthesize virtual resistance for suppressing system-grid resonance. When there are changes in working conditions of the system

the damping effect can be further improved by adaptively adjusting virtual resistance values through compensation. Simulation results show that background harmonics and resonance problems can be effectively suppressed by the proposed strategy

and the adaptability of multi-inverter grid-connected systems in weak grid is enhanced.

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