摘要
小功率并网逆变器输出含有较多的谐波,直接并网会给电网带来一定的谐波污染。传统的无阻尼LCL型滤波器存在零阻抗谐振带,很难滤除谐振频率附近的谐波,同时也会影响电流跟踪的精度。在无阻尼的LCL型滤波器基础之上,设计了带阻尼的滤波器;并且利用仿真软件分析了阻尼电阻值对系统损耗和滤波效果的影响。对样机输出电流进行傅里叶分析可知阻尼型滤波器能够显著地减少输出电流谐波含量,同时提高电流跟踪精度。
The output of grid inverter contains plenty of harmonics,when connected with grid will directly bring harmonic pollution to grid and is harmful to the tracing accuracy.In addition,there exists a zero-resistance band in the traditional LCL filter without damping resistance.On the basis of LCL without damping resistance,a kind of filter with damping resistance is designed and the mathematical model of filter is established to analysis the effect of resistance value on the filter effect and system efficiency.Through the Fourier analysis,a conclusion has been proved that the filter can reduce the THD of current waveform and improve the tracing accuracy.
出处
《电工电能新技术》
CSCD
北大核心
2012年第2期39-41,55,共4页
Advanced Technology of Electrical Engineering and Energy
