Flexible direct current reactive power control method and device

The embodiment of the invention discloses a flexible direct current reactive power control method and device, and the method comprises the steps: carrying out the voltage drop deviation value U according to the voltage drop deviation value U of a current conversion bus of a flexible direct current receiving end converter station during the short-circuit fault of an alternating current system and the voltage drop value Ui after the reactive power disturbance of the alternating current system; according to the deviation value U and the voltage drop value Uj of other direct current conversion buses after reactive power disturbance occurs in the alternating current system, calculating a flexible direct current multi-infeed short circuit ratio KSCRi according to the voltage drop value Ui and Uj of the direct current receiving end conversion bus, and calculating and determining a reactive power adjustment coefficient according to the deviation value U and the KSCRi; and determining a reactive compensation value of