基于映射弹性势能的电网有功承载能力定量指标  

Quantitative Index of Grid Active Power Load Capability Based on Mapping Elasticity Potential Energy

作　　者：竺炜[1] 周孝信[2] 蒋頔[1] 茹梁[1] 李娟[1] 

机构地区：[1]长沙理工大学电气与信息工程学院,湖南省长沙市410114 [2]中国电力科学研究院,北京市海淀区100192

出　　处：《中国电机工程学报》2014年第13期2088-2099,共12页Proceedings of the CSEE

基　　金：湖南省高校创新平台开放基金项目(13K056)~~

摘　　要：电网的有功承载能力取决于电网结构、支路承载能力以及电源和负荷的分布,其定量的分析方法及指标仍然是电网安全分析中的难题。基于支路有功、相位角及电网接线拓扑映射的纵向受力弹性力学网络模型,采用支路势能叠加法和边界势位法得到总的映射弹性势能。分析表明,该映射弹性势能可表征电网的有功承载能力和支路负载均衡性:其值越大,则电网的有功承载能力越弱,支路有功功率分配越不均衡。算例仿真验证了这些特性,该映射弹性势能也适用于识别电网的关键线路。该定量指标可用于电网规划、运行方式分析、离线或在线安全分析。Active power load capacity depends on grid structure, branch load capacity and distribution of power supply and load. Quantitative analysis method and index are still difficult problems of power system security analysis. Based on the vertical forced elasticity network model mapped by branch active power, phase angle and grid wiring topology, the branch potential energy superposition method and the Border Node Force-height method are used to get the general mapping elasticity potential energy. Analysis shows that the mapping elasticity potential energy can characterize active load capacity and branch load equilibrium of power grid： the greater its value, the weaker of active load capacity of power grid, the more uneven distribution of branch active power. Simulations verify these features and mapping elasticity potential energy can also be applied to identify critical lines of the grid. The quantitative index can be used to power grid planning, operation mode analysis and offline or online safety analysis.

关 键 词：映射弹性势能 电网有功承载能力 支路负载均衡性 关键线路 

分 类 号：TM71[电气工程—电力系统及自动化]