VQC control method for AC/DC parallel operation receiving end system

The invention provides a VQC control method for AC/DC parallel operation receiving end system, which solves the problem of reactive voltage control of AC/DC parallel operation receiving end system ofmulti-terminal flexible direct current transmission. The specific steps are as follows: firstly, obtaining the idle upper and lower limits of the high voltage side of the transformer, the upper and lower limits of the voltage, and the boundary conditions of the oscillation domain; secondly, collecting the operating parameters of the VQC transformer and the state information of the reactive voltagecontrol device; again, setting reactive power control blocking conditions for the transformer, the capacitor and the VSC; and finally, according to the predetermined strategies under different boundary conditions, performing the gear position adjustment and reactive power compensation equipment switching and VSC reactive power parameter setting. The method can ensure that the high-voltage side reactive power and the low-v