Track sensitivity-based two-stage control method for transient voltage of AC/DC receiving end system

The invention discloses an AC/DC receiving end system transient voltage two-stage control method based on trajectory sensitivity, and the method comprises the steps: solving a sensitivity matrix of transient voltage stability margin and drop amplitude to control quantity, and building a linearized AC/DC receiving end system transient voltage control model; prevention control of a first stage STATCOM and a new generation phase modifier is applied, and if the transient voltage drop amplitude is small, only the STATCOM is put into use; if the transient voltage drop amplitude is large, a new-generation phase modifier is put into use to improve the reactive power support capability during the fault period, and reactive power support is provided in the transient voltage recovery stage; after the first-stage transient voltage prevention control is applied, if a low-voltage delay recovery phenomenon does not exist, updating a transient voltage control quantity value, and solving a transient voltage stability margin,