并网逆变器一种减小死区影响的改进前馈策略  

AN IMPROVED FEEDFORWARD STRATEGY TO REDUCING DEAD-TIME EFFECT OF GRID-CONNECTED INVERTER

作　　者：李雨泽 张欣 郭斌 廖志凌[3] 柳张杰 Li Yuze;Zhang Xin;Guo Bin;Liao Zhiling;Liu Zhangjie(School of Automation,Central South University,Changsha 410006,China;College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China;School of Electrical and Information Engineering,Jiangsu University,Zhenjiang 212001,China)

机构地区：[1]中南大学自动化学院,长沙410006 [2]浙江大学电气工程学院,杭州310027 [3]江苏大学电气信息工程学院,镇江212001

出　　处：《太阳能学报》2025年第4期143-152,共10页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(62273363)。

摘　　要：以三相LC型并网逆变器为研究对象,首先从闭环传递函数的角度,揭示弱电网下传统公共耦合点(PCC)电压前馈策略与线路阻抗的交互作用会放大死区引入谐波,恶化系统电能质量。在此基础上,提出一种基于高通与低通滤波器的改进PCC电压前馈控制策略,该控制策略适用于大功率场合,且可在兼顾系统动态性能与稳定性的情况下有效减小死区影响,改善系统电能质量。最后通过仿真与实验验证所提控制策略的有效性。This paper takes three-phase LC type grid-connected inverters as the research object.Firstly,from the perspective of closedloop transfer function,it is revealed that the interaction between traditional PCC voltage feedforward strategy and line impedance amplifies the harmonics introduced by dead-time,thereby deteriorating the system power quality under a weak grid from the perspective of closed-loop transfer function.On this basis,this paper proposes an improved PCC voltage feedforward control strategy based on highpass and low-pass filters.This control strategy is suitable for high-power applications.It can improve the power quality and reduce the dead-time effect of the system while taking the dynamic performance and the system stability into account.Finally,the effectiveness of the proposed control strategy is validated through simulation and experiment.

关 键 词：逆变器 前馈控制 电能质量 死区 弱电网 

分 类 号：TM464[电气工程—电器]