新能源并网LCL滤波参数优化设计及实证

Optimization Design and Demonstration of LCL Filtering Parameters for New Energy Grid Connection

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;相关实验对上述设计方法和理论分析进行了验证。

Based on the harmonic equivalent circuit,the analytical expressions of the single harmonic and total harmonic content of the current at the grid side and the converter side are derived.A perfect design of LCL filter is proposed based on the limit of the value of each flter element,and the optimal selection of parameters is discussed.The stability of the control system is analyzed with the correlation control strategy.The above design method and theoretical analysis are verified by relevant experiments.