Grid-forming direct-driven wind turbines can be mainly divided into active power control type and DC voltage control type. At present

there is a lack of comparative analysis about the stability of the two types of grid-forming wind turbines. In response to these above issues

a small-disturbance stability margin quantification method for grid-forming direct-driven wind turbines considering the DC-link interaction is proposed in this paper. Based on the amplitude phase frequency characteristics

the small-disturbance interaction mechanism between the machine-side and grid-side converters of grid-forming direct-driven wind turbines is revealed. The research results indicate that the grid-forming grid-side converter under active power control mode exhibits negative resistance characteristics on the DC side

which can easily interact abnormally with the machine-side converter and cause instability. There is no DC-side interactive unstable issues in the grid-forming direct-driven wind turbine under DC voltage control mode. On this basis

a stabilization control method is proposed

which effectively enhances the stability of grid- forming wind turbines under active power control mode. Finally

grounded on the PSCAD/EMTDC platform

the correctness of the theoretical analysis and the effectiveness of the proposed stabilization control method are verified.