基于负低-高通滤波器的并网电流反馈新型有源阻尼方法  

Active damping method for grid-connected current feedback based on negative low-high pass filter

作　　者：孙灵喜 黄海宏[1] 韦友龙 王海欣[1] SUN Ling-xi;HUANG Hai-hong;WEI You-long;WANG Hai-xin(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,安徽合肥230009

出　　处：《电机与控制学报》2023年第2期27-34,共8页Electric Machines and Control

基　　金：国家自然科学基金(51177037)。

摘　　要：基于并网电流反馈的有源阻尼方法常用来抑制LCL型并网逆变器的谐振尖峰,现有方法会放大高频噪声、降低并网电流质量。因此提出了基于负低-高通滤波器的并网电流反馈新型有源阻尼方法,在抑制谐振尖峰的同时,也降低了对高频信号的增益,进一步提高并网电流质量。采用极点配置法,围绕系统的稳定裕度以及有源阻尼效果设计新型有源阻尼的参数;随后讨论了LCL参数和电网阻抗变化时新型有源阻尼控制系统的鲁棒性。仿真与实验结果证明,该方法使得控制系统对高频噪声有更好的抑制作用,在不同的工况下均具有良好的稳定裕度,在电网阻抗变化时下依然可以有效抑制谐波电流。Active damping methods based on grid-connected current feedback are commonly used to suppress resonant spikes in LCL-type grid-connected inverters.Existing active damping methods for grid-connected current feedback amplify high-frequency noise and degrade the quality of grid-connected current.Therefore,an active damping method for grid-connected current feedback based on negative low-high-pass filter is proposed to further improve the quality of grid-connected current by reducing the gain to high-frequency signals while suppressing resonant spikes.The pole configuration method was applied to design the parameters of this active damping around the stability margin of the system and the active damping effect.Then the robustness of the active damping control system was discussed when the LCL parameters and grid impedance were varied.The simulation and experimental results show that with this method,the control system has better suppression effect on high-frequency noise,and good stability margion under different working conditions,and can effectively suppress harmonic current when the grid impedance changes.

关 键 词：LCL滤波器 有源阻尼 负低-高通滤波 极点配置法 鲁棒性 

分 类 号：TM46[电气工程—电器]