As the integration of wind power into the Northeast China power grid continues to increase, and conventional energy unit outputs decline, leading to inadequate reactive power reserves, it poses a threat to the voltage stability of the power system. This study investigates the factors influencing system voltage stability due to wind power integration, utilizing three different scenarios of wind power penetration in the Northeast China grid modeled through electromagnetic transient simulation software. The research reveals that as the capacity of wind power units integrated into the same node increases, the maximum load parameter decreases, and the slope of the P-V curve shifts from a stable voltage point towards a voltage collapse point. Introducing wind speed disturbances inversely affects node voltages relative to wind speeds, with nodes farther from wind farms experiencing less influence from wind speed disturbances under the same voltage level. To adapt to large-scale high-penetration wind power systems, this paper proposes a reactive power coordination control strategy for installing STATCOM based on voltage sensitivity and MLP margin size at selected sites. Simulation results demonstrate that after compensation, the normalized maximum load parameter at nodes increases by 0.01824. The peak differences at nodes without compensation and under compensated conditions are reduced to 0.009 and 0.00617, respectively, with peak differences at the converter’s near-zone nodes reduced to 0.0086 and 0.0059. The peak variation in reactive power within the converter decreases by 6.43 Mvar. Compared to traditional reactive power compensation methods, the proposed control strategy significantly enhances grid stability.