文章阐述了变压器零序电抗的实测方法并给出了折算成标幺值的公式，同时分析了常用的变压器零序电抗与正序阻抗之间的关系，为简化计算提供了方便。(This paper expounds the measuring method of zero sequence reactance of the transformer are converted into normalized value formula, it also analyzes the relation between transforme

计算自然坐标系下的序阻抗，暂时没有添加信号输入(The calculation of the sequence impedance in the natural coordinate system)

基于序阻抗的直驱风电场次同步振荡分析与锁相环参数优化设计((impedance modeling +PLL modeling) sequence impedance of direct drive wind power farm subsynchronous oscillation analysis and parameter optimization design based on PLL)