张乐桢,侯焱伦,牛炜,保承家,朱婷
ZHANG Lezhen,HOU Yanlun,NIU Wei,BAO Chengjia,ZHU Ting

• 1:国网甘肃省电力公司白银供电公司
• 2:国网甘肃省电力公司

摘要(Abstract)：

在弱电网条件下，采用不同控制策略的并联逆变器通过电网阻抗相互耦合，使得多逆变器并联接入弱电网系统的稳定运行条件更加恶劣。为了增强弱电网条件下并联逆变器系统的稳定性，对采用3种典型控制策略的逆变器分别设计新型的输出导纳重塑策略。通过对逆变器的不同控制环路引入合适的补偿环节来重塑导纳，即针对单网侧电流反馈、单逆变器侧电流反馈、网侧电流反馈结合电容电流有源阻尼3种控制策略分别引入带阻滤波器、二阶超前环节、滞后环节，消除单台逆变器输出导纳的非正实部频段，并给出不同补偿环节的参数设计方法。理论分析和仿真结果表明，所提策略能够提高由多台采用不同控制策略逆变器组成的并联系统的稳定性和动态性能。
Under weak grid conditions, parallel inverters with different control strategies are coupled through grid impedance, making the stable operation of the system with multiple inverters even more challenging. To enhance the stability of parallel inverter systems under weak grid conditions, novel output admittance remodeling strategies are designed for inverters using three typical control strategies. Admittance is remodeled by introducing appropriate compensation elements into the different control loops of the inverter. Specifically, for the three control strategies—gridside current feedback, inverter-side current feedback, and grid-side current combined with capacitor current feedback for active damping—band-stop filters(BSFs), second-order lead elements, and lag elements are introduced, respectively, to eliminate the non-positive real frequency components of the single inverter's output admittance. The parameter design methods for each compensation element are also provided. Theoretical analysis and simulation results show that the proposed strategy improves the stability and dynamic performance of the parallel systems consisting of multiple inverters using different control strategies.

关键词(KeyWords)： 弱电网;并联逆变器;稳定性分析;导纳重塑
weak grid;parallel inverter;stability analysis;admittance remodeling

Abstract:

Keywords:

基金项目(Foundation): 甘肃省重点研发项目(2022YFG0300);; 国家电网有限公司科技项目(522703230009)

作者(Author): 张乐桢,侯焱伦,牛炜,保承家,朱婷
ZHANG Lezhen,HOU Yanlun,NIU Wei,BAO Chengjia,ZHU Ting

DOI: 10.19585/j.zjdl.202508010

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