LCL并网逆变器有源阻尼预测无差拍平均模型控制  

Active Damping Predictive Dead-beat Average Model Control for LCL Grid-tied Inverter

作　　者：朱颖达 陈常曦 欧阳红林[1] 肖牧轩 ZHU Yingda;CHEN Changxi;OUYANG Honglin;XIAO Muxuan(College of Electrical and Information Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学电气与信息工程学院,湖南长沙410082

出　　处：《湖南大学学报(自然科学版)》2025年第2期151-163,共13页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金委智能电网联合基金项目(U2166602)。

摘　　要：为解决LCL并网逆变器固有的谐振问题,提出优化的电流控制方法和有源阻尼方法;为减小数字控制系统延时对电流控制和有源阻尼的影响,提出无差拍平均模型和复合型延时消除方法.由于控制模型是电流控制和延时补偿的基础,通过引入过采样方法并融合信号处理技术,建立逆变器侧电流反馈控制的无差拍平均模型,将传统单样本瞬时控制转化为多样本平均控制,改善控制模型的准确性.基于所建模型,通过引入结合双重脉冲宽度调制(pulse width modulation,PWM)更新的预测控制,提出预测无差拍平均模型控制方法,提供精确的延时补偿,提高系统的稳定性和鲁棒性.在预测无差拍平均模型控制的基础上,提出平均电容电压前馈法,消除数字延时对有源阻尼的影响,进一步加强弱电网条件下系统的鲁棒性,通过实验验证了本文方法的有效性.To address the inherent resonance issue of LCL grid-connected inverters,the optimized current control method and active damping method are proposed.To minimize the influence of digital system delays on current control and active damping,the deadbeat average model and compound delay elimination method are proposed.Because the control model is the basis of current control and time-delay compensation,a deadbeat average model for inverter-side current feedback control is established by introducing an oversampling method and incorporating signal processing method.This approach transforms the conventional single-sample instantaneous control into multi-sample average control,which improves the accuracy of the control model.Based on the established model,a predictive dead-beat average model(PDBAM)control method is proposed through the introduction of predictive control combined with the double-updated PWM method,which provides accurate delay compensation and improves the stability and robustness of the system.Based on PDBAM control,the average capacitor-voltage feedforward method is proposed,which eliminates the influence of digital delay on active damping and further strengthens the robustness of the system under weak grid conditions.The experimental results prove the effectiveness of the proposed method in this paper.

关 键 词：数字控制系统 功率变换器 控制系统分析 有源阻尼 

分 类 号：TM464[电气工程—电器]