基于改进戴维南等值的风电并网系统暂态电压稳定性评估方法OA

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.