Positive sequence sag disturbance power-free voltage sag source positioning method and system

The invention discloses a reactive voltage sag source positioning method and system based on positive sequence sag disturbance. The voltage sag source positioning method comprises the following steps: S10, acquiring three-phase voltage and three-phase current data of each monitoring point; s20, positive-sequence sag disturbance reactive power is calculated, and a sag route is determined according to the polarity of the positive-sequence sag disturbance reactive power; s30, establishing a voltage sag accurate positioning model; and S40, solving the voltage sag accurate positioning model through an improved whale optimization algorithm, and accurately determining the position of a voltage sag source. The voltage sag source positioning method is less constrained by a power grid structure, a load model and measurement precision, the positioning accuracy is higher, and the calculated amount is small. 本发明公开了一种基于正序暂降扰动无功率的电压暂降源定位方法和系统，电压暂降源定位方法包括如下步骤：S10：获取各个监测点的三相电压和三相电流数据；S20：计算正序暂降扰动无功功率，并根据其极性确定暂降路线；S30：建立电压暂降精确