摘要
Abstract
In the new power system supported by grid type energy storage,the penetration rate of new energy continues to rise,and the proportion of synchronous power sources decreases,resulting in weakened inertia support and narrowed strength margin of the system.This induces high-dimensional and nonlinear perturbations in node voltage with changes in operating conditions,making it difficult to quickly locate weak nodes.Therefore,a fast positioning method for weak nodes in the new power system supported by grid based energy storage is proposed.Calculate the node power flow impact value to obtain the system power flow distribution entropy,and quantify the distribution uniformity of power grid power flow.Introduce voltage change rate as a dynamic characterization index of node voltage vulnerability,and analyze the evolution law of system voltage after grid type energy storage is connected.Abstractly mapping 3D GIS technology to the multidimensional feature space of the power system,constructing a 3D state space of voltage amplitude,frequency change rate,and time axis,transforming the nonlinear perturbation trajectory of nodes into spatial geometric features,and accurately identifying thin and weak nodes using trajectory curvature and outlier distance.The comparative experimental results show that after the application of the designed method,the positioning deviation is controlled within±0.01 km.In the robustness verification,when the new energy penetration rate is increased to 65%,the average deviation is only 0.011 km,which can achieve rapid positioning of weak nodes.关键词
构网型储能/潮流分布熵/三维GIS/薄弱节点/新型电力系统/电压变化率Key words
grid based energy storage/trend distribution entropy/3D GIS/weak nodes/new power system/voltage variation rate分类
信息技术与安全科学
