基于正序分量相位差的电压暂降源定位方法

Location Method of Voltage Sag Source Based on Phase Difference of Positive Sequence Components

针对复杂网架结构和多扰动源类型场景下传统电压暂降源定位方法失效的问题,提出一种基于正序分量相位差的电压暂降源定位方法。首先,应用线性电路的叠加原理,分析扰动源作用下电网有功功率传输规律,并以电压与电流间相位差表征电压暂降源相对位置不同时功率转移方式的差异;然后,引入瞬时对称分量法,得到不受扰动源类型和网架结构限制的电压暂降源定位判据;最后,通过仿真与实例验证证明了所提方法的有效性与准确性。

Aiming at the failure of traditional voltage sag source location method in complex grid structure and multi-disturbance source type scenarios,a voltage sag source location method based on positive sequence component phase difference is proposed.Firstly,the superposition principle of linear circuit is used to analyze active power transmission rule under the action of disturbance source is analyzed,and the difference of power transfer mode when the relative position of voltage sag source is different is characterized by the phase difference between voltage and current.Secondly,by introducing instantaneous symmetric component method,the location criterion of voltage sag source is obtained which is not affected by disturbance source types.Finally,the accuracy and effectiveness of proposed method are verified by simulation and field cases.