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基于阻抗重塑分析的逆變器并網穩定性研究

來源：電工電氣發布時間：2023-07-27 13:27 瀏覽次數：530

基于阻抗重塑分析的逆變器并網穩定性研究

楊茹楠，劉明陽，李德強，徐奕翔，蘇旭

(國網天津市電力公司濱海供電分公司，天津 300450)

摘要：在弱電網下，電網阻抗的存在會削弱三相逆變器的穩定裕度，阻抗分析法可針對并網逆變器與弱電網之間的相互作用開展研究。分析了逆變器阻抗重塑控制策略，引入正負序并聯校正阻抗進行逆變器的阻抗重塑；通過優化比例前饋系數和改進鎖相環結構增大系統的穩定裕度，擴展三相逆變器并網系統穩定運行時電網阻抗范圍，提高了系統對弱電網的適應性；將所提控制策略應用于三相逆變器并網系統并通過 MATLAB/Simulink 進行仿真，結果驗證了該控制策略的有效性。

關鍵詞： 弱電網；并網逆變器；序阻抗；阻抗重塑；穩定性

中圖分類號：TM464 文獻標識碼：A 文章編號：1007-3175(2023)07-0014-07

Research on Grid-Connected Stability of Inverters Based on

Impedance Reshaping Analysis

YANG Ru-nan, LIU Ming-yang, LI De-qiang, XU Yi-xiang, SU Xu

（State Grid Tianjin Electric Power Company Binhai Power Supply Company, Tianjin 300450, China）

Abstract: The existence of grid impedance weakens the stability margin of three-phase inverters in the weak grids, and the impedance analysis method can be used to analyze the interaction between grid-connected inverters and weak grids.In the paper, the impedance reshaping control strategy of inverters is analyzed, and the positive and negative sequence parallel correction impedance is introduced for impedance reshaping.The system stability margin increases through optimizing proportional feedforward coefficients and improving phase-locked loop structure, and the system adaptability to the weak grid improves by expanding the grid impedance range as the grid-connected system of three-phase inverters operates stably.The control strategy is applied to the grid-connected system of three-phase inverters and is simulated through MATLAB/Simulink, and the above results verify its effectiveness.

Key words: weak grid; grid-connected inverter; sequence impedance; impedance reshaping; stability

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基于阻抗重塑分析的逆變器并網穩定性研究