The implementation of developing the wind power is an important way to achieve the low-carbon power system. However, the voltage stability issues caused by the random fluctuations of active power output and the irrational regulations of reactive power compensation equipment have become the prominent problems of theregions where large-scale wind power integrated. In view of these problems, this paper proposed an optimal reactive power dispatch (ORPD) strategy of wind power plantscluster (WPPC) considering static voltage stability for low-carbon power system. The control model of the ORPD strategy was built according to the wind power prediction,the present operation information and the historical operation information. By utilizing the automatic voltage control capability of wind power plants and central substations,the ORPD strategy can achieve differentiated management between the discrete devices and the dynamic devices of the WPPC. Simulation results of an actual WPPC in North China show that the ORPD strategy can improve thevoltage control performance of the pilot nodes and coordinate the operation between discrete devices and the dynamic devices, thus maintaining the static voltage stability as well.