考虑风电不确定性的交直流混联系统同质化能量函数模型

交直流混联电网是电网发展的新形态,如何有效保障交直流混联系统安稳运行是重大而紧迫的国家需求。文章针对含大规模风电的交直流混联系统稳定性问题,提出考虑风电波动不确定性的交直流混联弱送端系统同质化能量函数模型。首先,研究含大规模风电的交直流混联弱送端系统潮流方程;其次,建立含风电的交直流混联系统支路暂态势能函数模型,研究交直流混联系统功角稳定机理,建立基于同质化能量函数模型;在此基础上,提出基于同质化能量函数的电力系统稳定性评估模型,并推导交直流混联系统稳定性判据;最后,以北方某区域交直流混联系统为仿真算例,验证所提模型的有效性,为含大规模新能源的交直流混联系统的稳定性控制提供理论依据。

Homogeneous energy function model for AC/DC hybrid systems considering wind power uncertainty

Aiming at the stability problem of AC/DC hybrid system with large-scale wind power,this paper establishes a homogenization energy function model for AC/DC hybrid weak-end system considering wind power fluctuation uncertainty.Firstly,the tidal current model of the AC-DC hybrid weak-end system with wind power is studied.Then,the transient potential energy function of the branch of the AC-DC hybrid system with wind power is established.The mechanism of power angle stabilization of AC/DC hybrid system is studied,and a homogenization energy function model is established.On this basis,the stability evaluation model of power system based on homogenization energy function is established,and the stability criterion of AC/DC hybrid system is proposed.It provides a basis for the stability control of large-scale delivery of UHV AC-DC hybrid power grids.