Method for calculating reactive power reserves of generator

The invention relates to a method for calculating reactive power reserves of a generator, and belongs to the technical field of electric power system voltage/reactive power dynamic control. According to the invention, the reactive power reserves of the generator adopting different excitation systems are calculated in real time through sampling an exciting current value by using active and reactive power angle equations of the generator. The method comprises the steps of calculating a static reactive power reserve; calculating an activated dynamic reactive power reserve; and subtracting the activated dynamic power reserve from the static reactive power reserve. The method provided by the invention can realize online calculation for the static reactive power reserve and simulation calculation for the dynamic reactive reserve of the generator, and has the advantages of good universality, small number of parameters required to be measured, ability of carrying out fast calculation online and the like.