用于太阳能和风力发电系统并网LCL滤波器的分析和设计

Analysis and design of LCL filter connecting to the grid in PV and wind generator system

针对太阳能和风力发电系统中频繁用到的并网LCL滤波器,建立其数学模型,详细分析LCL滤波器网络各项参数的特性,提出设计的限制条件,推导出系统中滤波电感和滤波电容之间的关系式,进而推算出电感和电容值,同时分析了滤波电容增加阻尼电阻对系统性能的影响。仿真结果表明,设计的LCL滤波器可以完成在新能源行业中优质并网的要求,也验证了理论分析的正确性。

Aiming at PV and wind generator system,LCL-filter is adopted instead of the traditional pure inductor filter at present.A LCL filter model is established,and characteristic of various parameters of LCL network is also analyzed.The harmonic attenuation ratio as benchmark is brought forward and the relationship between filter capacitor and filter inductor is established.Further seek capacitance and inductance values,at the same time,analyzing the characteristic of adding the resistance into filter capacitor network.The results show that the designed LCL filter can achieve the purpose of connecting into the grid perfectly.Finally the design method is verified by the experimental results.