结合数字延时补偿的并网逆变器阻抗重塑方法  

IMPEDANCE REMODELING METHOD OF GRID CONNECTED INVERTER COMBINED WITH DIGITAL DELAY COMPENSATION

作　　者：李建文 马小棠 吴滨源 李戎 杨瑞卿 Li Jianwen;Ma Xiaotang;Wu Binyuan;Li Rong;Yang Ruiqing(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Baoding 071003,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),保定071003

出　　处：《太阳能学报》2023年第4期316-323,共8页Acta Energiae Solaris Sinica

基　　金：河北省自然科学基金(E2017502053);中央高校基本科研业务费专项资金(2020MS095)。

摘　　要：首先建立并网逆变器阻抗模型,探究数字延时导致系统稳定性降低的原因,然后提出一种结合数字延时补偿的并网逆变器阻抗重塑方法,包括牛顿插值预测的延时补偿策略和逆变器阻抗重塑策略。该方法可有效削弱数字延时对逆变器输出阻抗的不利影响,提高阻抗相交点频率处的相位裕度,拓宽并网系统适应电网阻抗变化的范围。最后,基于半实物仿真平台RT-LAB,搭建并网逆变器模型进行实验,验证该方法的有效性。This paper firstly establishes the impedance model of grid-connected inverter to explore the reasons why the digital delay leads to the decrease of system stability,and then a grid-connected inverter impedance reshaping method combined with digital delay compensation is proposed,including delay compensation predicted by Newton interpolation Strategy and Inverter Impedance Reshaping Strategy.This method can effectively weaken the adverse effect of digital delay on the output impedance of the inverter,improve the phase margin at the frequency of the impedance intersection point,and broaden the scope for the grid-connected system to adapt to grid impedance changes.Finally,based on the hardware-in-the-loop simulation platform RT-LAB,a grid-connected inverter model is established for experiments to verify the effectiveness of the proposed method.

关 键 词：LCL型并网逆变器 弱电网 并网控制 稳定性 延时 

分 类 号：TM464[电气工程—电器]