Phase modifier site selection method and device based on voltage sensitivity index

The invention provides a phase modifier site selection method and device based on a voltage sensitivity index, and the method comprises the steps: selecting any bus, adding the reactive power of a preset value, determining the voltage change process of all buses, and calculating the voltage sensitivity index; repeating the processes of selecting any bus, adding the reactive power with the preset value and calculating the voltage sensitivity index until all buses are traversed; and selecting the bus with the maximum voltage sensitivity index as a site selection result of the phase modifier. According to the method, the maximization of the voltage sensitivity index is used as a site selection reference index of the synchronous phase modifier, so that the site selection has excellent reactive voltage support capability, the bus position most suitable for the newly-built phase modifier can be found, and an optimized strategy scheme is provided for reactive voltage support of the system. Meanwhile, in combination