With the development and utilization of renewable energy

the proportion of wind power in power system is growing rapidly. Due to the significant difference of transient voltage characteristics between wind turbines and synchronous generators

the voltage stabilization mechanisms have undergone profound changes

making it difficult for traditional analysis methods to evaluate the transient voltage level of the system accurately and quickly. In this paper

considering the transient voltage response characteristics of multi-heterogeneous power sources and loads

the voltage stability evaluation method of grid-connected wind power system under grid short-circuit fault is studied. First

from the perspective of fine identification of time-domain cross-section parameters

this paper proposes an improved Thevenin equivalent method to analyze transient voltage stability of wind turbines. Then

considering the transient voltage response characteristics of diverse power sources and loads

the equivalent model is established. On this basis

combined with the constraints of power transfer capability and power angle stability of the system

a quantitative evaluation method of system stability operation boundary and voltage stability is proposed. Finally

the effectiveness and robustness of the proposed stability margin index are validated through multiple simulation cases.