摘要
传统加权平均电流(WAC)控制策略可以简化系统的参数设计步骤,在LCL型并网逆变器中得到了广泛应用。然而,传统WAC控制并网未充分考虑延时的影响,控制延时会直接影响数字控制下并网逆变器的降阶特性,此时并网逆变器系统依然是较复杂的三阶系统。为解决这个问题,本文首先分析采用传统WAC控制策略并网逆变器系统失稳机理,然后提出采用二阶低通滤波器补偿控制延时引入的相位滞后,并提供了补偿器的参数设计方案。最后,通过Matlab/Simulink仿真和实验验证了所提改进WAC控制策略的正确性和有效性。
The traditional weighted average current(WAC)control strategy can simplify the parameter design steps of the system,and has been widely used in LCL-type grid-connected inverters.However,the traditional WAC control gridconnected does not fully consider the effect of delay,the control delay will directly affect the down-order characteristics of the grid-connected inverter under digital control,at this time,the grid-connected inverter system is still a more com⁃plex third-order system.In order to solve this problem,this paper firstly analyses the instability mechanism of the gridconnected inverter system using the traditional WAC control strategy,and then proposes using a second-order low-pass filter to compensate for the phase lag introduced by the control delay,and provides a parameter design scheme for the compensator.Finally,the correctness and effectiveness of the proposed improved WAC control strategy is verified through Matlab/Simulink simulation and experiment.
作者
李冲
李成虎
李春光
马星河
Li Chong;Li Chenghu;Li Chunguang;Ma Xinghe(Pingdingshan Tian’an Coal Co.,Ltd.,Pingdingshan 467000,China;Henan Polytechnic University,Jiaozuo 454003,China)
出处
《电力电子技术》
2025年第6期42-47,共6页
Power Electronics
基金
国家自然科学基金(U1804143)。
关键词
低通滤波器
加权平均电流
弱电网
控制延时
low-pass filter
weighted average current
weak network
control delay
