多边界约束的LCL并网变流器滤波参数设计

Design of Filter Parameters for LCL Grid-connected Converter With Multi-boundary Constraints

以谐波等效电路为基础,推导网侧及变流器侧电流单次谐波及总谐波含量的解析表达式。结合滤波器各元件取值的限制条件,提出了一种完善的LCL滤波器设计,并对参数的优化选择进行了讨论。结合相关控制策略,对控制系统的稳定性进行了分析。通过相关的实验对上述设计方法和理论分析进行了验证。

On the basis of harmonic equivalent circuit,the analytical expressions of single harmonic and total harmonic contents of current on the grid side and converter side are derived.Combined with the limiting conditions of filter elements,a perfect design of LCL filter is proposed,and the optimal selection of parameters is discussed.Combined with relevant control strategies,the stability of the control system is analyzed.The above design methods and theoretical analysis are verified by relevant experiments.