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弱電網下逆變器間諧波振蕩特征分析與抑制方法的研究

來源：電工電氣發布時間：2025-01-07 12:07 瀏覽次數：221

弱電網下逆變器間諧波振蕩特征分析與抑制方法的研究

李知城¹，何海鵬¹，吳良弼¹，陳華勝¹，吳林翰¹，劉俊峰²

(1 廣東電網有限責任公司湛江供電局，廣東湛江 524000；

2 華南理工大學自動化科學與工程學院，廣東廣州 510640)

摘要：弱電網下逆變器會與電網發生交互，產生間諧波振蕩，而導致嚴重的電能質量問題。建立了弱電網下并網逆變器的阻抗模型，并基于阻抗模型通過特征提取分析系統的穩定性；對間諧波振蕩所引起的電能質量問題進行了機理分析，依據分析結果提出了一種新型鎖相環結構，可以抑制逆變器在弱電網下的間諧波振蕩，來解決其所引起的電能質量問題。仿真與實驗結果表明，所提新型鎖相環結構通過鎖相環前置帶通濾波器抑制諧波從而提升系統的穩定性，且有效地減少了傳統鎖相環結構所導致的超調問題，與傳統鎖相環結構在動態性能上相差不大。

關鍵詞： 逆變器；弱電網；間諧波振蕩；電能質量；鎖相環結構；帶通濾波器；特征提取

中圖分類號：TM464 ；TM712 文獻標識碼：A 文章編號：1007-3175(2024)12-0042-06

Research on Characteristic Analysis and Suppression Methods of

Interharmonic Oscillations for Inverters Under Weak Grid

LI Zhi-cheng¹, HE Hai-peng¹, WU Liang-bi¹, CHEN Hua-sheng¹, WU Lin-han¹, LIU Jun-feng²

（1 Zhanjiang Power Supply Bureau of Guangdong Power Grid Co., Ltd, Zhanjiang 524000, China;

2 School of Automation Science and Engineering, South China University of Technology, Guangzhou 510640, China）

Abstract: Under the weak grid, the inverter will interact with the grid and generate interharmonic oscillations, which will lead to serious power quality problems. The impedance model of the grid-connected inverter under a weak grid is established, and the stability of the system is analyzed by feature extraction based on the impedance model; the mechanism of the power quality problem caused by interharmonic oscillations is analyzed, and based on the analytical results, a new phase-locked-loop structure is proposed, which can inhibit the interharmonic oscillations of the inverter under a weak grid and solve the power quality problem caused by the interharmonic oscillations. Simulation and experimental results show that the proposed new phase-locked loop structure can improve the stability of the system by suppressing the harmonics through the phase-locked loop front band-pass filter, and effectively reduce the overshooting problem caused by the traditional phaselocked loop structure, which is not much different from the traditional phase-locked loop structure in terms of dynamic performance.

Key words: inverter; weak grid; interharmonic oscillation; power quality; phase-locked loop structure; band-pass filter; feature extraction

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弱電網下逆變器間諧波振蕩特征分析與抑制方法的研究