提出了一种考虑电压支撑作用的外部电网等值建模方法． 首先由电力系统综合分析程序( PSASP) 的多重故障仿真计算外网所有边界节点的短路信息，得到电流源支路
形式的外网等值模型，该模型忽略了内网运行，因而边界节点电压存在一定误差． 在将该模型转化为基于戴维南支路的阻抗型外网模型后，提出了一种在边界节点的等值功率注入支路中进行以实际电网稳态电压为期望值的等值电势修正的方法，所获修正后的外网等值模型基于边界节点信息，能准确反映外部电网对内网的电压支撑作用． 最后以宁夏局部新能源发电网为例，分别在长链型和环型两种内网结构下对外网建模，仿真验证了所提外网等值建模方法的正确性和有效性．

Proposed in this paper is a new equivalent modeling method of external network considering voltage sup- port.Firstly,on the basis of short circuit information of all external network boundary nodes obtained by multiple fault simulation with Power System Analysis Software Package,an equivalent model of external network in the form of current source branch is established.Secondly,in order to overcome the errors of boundary node voltages due to the ignorance of internal network,the model is converted into a model in the form of Thevenin impendence branch.Then,a potential correction method,which takes actual steady-state voltages as the expectations in equivalent power injection branch,is proposed.The modified equivalent model on the basis of boundary node information can ac- curately reflect the voltage support of external network.Finally,by taking Ningxia regional new energy power grid for example,two external networks respectively with long chain-type and ring-type internal networks are modeled.Simulated results verify the validity and accuracy of the proposed modeling method.