Abstract: In order to enhance the stability of power grid operation and improve power supply capacity of power

grid，a power supply capacity simulation method based on harmonic reactive compensation was proposed. The

harmonic data in the power network equipment was calculated through DIgSILENT/PowerFactory software，

including generator，transformer，load，transmission line，shunt capacitor bank and other harmonic parts；according to the acquired harmonic data，the active power filter（APF）as the core was combined with static var compensator （SVC），so that the thyristor switched capacitor（TSC）and the APF connected by the H bridge were connected with the grid，and the inductance parameter was set to realize current tracking；according to the open-loop control，TSC and APF were worked in parallel under stable conditions；through TSC's autonomous classification，the constantly changing reactive power was compensated，and APF was used to compensate again the parts that cannot be completed between different levels，so as to complete the comprehensive suppression of harmonic reactive power compensation in the grid. The simulation results show that the proposed method can effectively suppress the harmonics，and the harmonic current content is within the range of national standard value，effectively enhance the power supply performance of the grid.

      Key words: harmonic reactive power compensation ；grid power supply capacity ；active power filter（APF）；

static var generator（SVG）；DIgSILENT / PowerFactory software ；harmonic data