摘要
电容电流反馈有源阻尼法能够抑制LCL滤波器的谐振尖峰。控制延时的存在会严重影响电容电流反馈控制方法的阻尼效果,降低系统对电网阻抗的鲁棒性。提出一种改进型电容电流反馈控制方法,通过减少计算延时和引入延时反馈环节,使虚拟阻抗在整个可控频率范围内呈正阻特性,提高系统鲁棒性。分析了改进后方法的稳定性并给出了使用该方法前后的闭环极点轨迹。仿真和实验结果验证了理论研究的有效性。
The capacitive current feedback active damping method can suppress the resonance peak of the LCL filter.The existence of control delay will seriously affect the damping effect of the capacitor current feedback control method and reduce the robustness of the system to the grid impedance.An improved capacitive current feedback control method is proposed.By reducing the calculation delay and introducing a delay feedback link,the virtual impedance has a positive resistance characteristic over the entire controllable frequency range which improves the system robustness.The stability of improved method is analyzed and the closed-loop pole trajectories before and after using this method are given.Simulation and experimental results verify the validity of the theoretical research.
作者
张淼
谢斯炜
石响
ZHANG Miao;XIE Si-wei;SHI Xiang(Guangdong University of Technology,Guangzhou 510006,China)
出处
《电力电子技术》
CSCD
北大核心
2020年第8期58-60,64,共4页
Power Electronics
基金
广东省自然科学基金(2015A030313478)
关键词
并网逆变器
鲁棒性
控制方法
grid-connected inverter
robustness
control method
