摘要
在满足相同的高频滤波效果的情况下,LCL滤波器所需的总电感值比L滤波器小,因此更适于在大功率、开关频率较低的电流源控制型并网设备上应用。然而针对该类型滤波器的参数设计不仅关系到开关频率处纹波抑制效果,同时也会影响并网电流控制器的性能。本文首先建立LCL滤波器在并网模式下的谐波模型,其次研究滤波器各参数变化与纹波抑制和谐振频率之间的变化关系,在此基础上提出在尽量节约总的电感磁心材料的前提下,设计出滤波效果最优的LCL滤波器的参数值,同时还需要保证LCL滤波器的谐振频率不能太小,以免成为制约电流控制器设计时的因素。最后通过三相并网逆变器的实验装置给出LCL滤波器设计方案的实验效果。
Because LCL filter needs smaller inductance value comparing to L type filter at the same performance in harmonic suppression, it is gradually used in high-power and low-frequency current-source-controlled grid-connected converters. However design work of LCL filter parameter not only relates to switch frequency ripple attenuation, but also impacts on performance of grid-connected current controller. First of all, this paper introduces a harmonic model of LCL filter in grid-connected operation, secondly researches the variable relationship among LCL filter’s parameter and resonance frequency and high-frequency ripple attenuation. In order to achieve optimal effect under the precondition of saving inductance magnetic core of LCL filter, a reasonable design method is brought out based on above analysis. Furthermore the method can guarantee that the resonance frequency of LCL filter is not too small to impact current controller design. Finally this design method is verified by the experimental results.
出处
《电工技术学报》
EI
CSCD
北大核心
2010年第3期110-116,共7页
Transactions of China Electrotechnical Society
基金
中国博士后科学基金资助项目(20090451063)
关键词
并网逆变器
LCL
滤波器
谐振频率
谐波抑制
磁心
Grid-connected inverter
LCL filter
resonance frequency
harmonic suppression
magnetic core
