Node-Breaker Model of the IEEE 300-Bus System

Conventianlly, state estimation is run on reduced bus-branch (BB) network models. On the other hand, when detailed node-breaker (NB) models are used, no network reduction is necessary. This allows joint estimation of system states and network topology. For testing SE applications using NB models, an expanded version of the IEEE 300-bus system is created. The following changes are made to the original BB model to generate the NB model:The original system information (branch impedance values, loads and generators) in the IEEE 300-bus system is retained.All transmission buses are treated as substations with either double-bus-double-breaker, ring-bus, or breaker-and-a-half configurations, based on the number of incident lines.To terminate both ends of each regular branch between two circuit breakers, 1186 zero-impedance branches are added in the new NB model. The flows through these branches constitute the new SD-flow states.With the addition of SDs, the node count goes up from 300 in the BB model to 1233 in the NB model. All new nodes are given a unique four digit bus number.传统上，状态估计（state estimation, SE）通常运行于简化母线-支路（bus-branch, BB）网络模型。与之相对，当采用详细的节点-断路器（node-breaker, NB）模型时，无需进行网络简化，从而可实现系统状态与网络拓扑的联合估计。为测试基于NB模型的状态估计应用，我们构建了IEEE 300节点系统（IEEE 300-bus system）的扩展版本。为生成该NB模型，需对原始BB模型做出如下修改：保留IEEE 300节点系统的原始系统信息，包括支路阻抗值、负荷与发电机参数；所有输电母线将根据关联线路的数量，被配置为双母线双断路器、环形母线或半断路器结构的变电站；为将每条常规支路的两端均接入两个断路器之间，新的NB模型中新增了1186条零阻抗支路，通过这些支路的潮流构成了新的SD-潮流（SD-flow）状态。随着SD元件的加入，节点总数从BB模型中的300个增至NB模型中的1233个，所有新增节点均被分配唯一的四位数字母线编号。