复杂配电网的电压暂降随机预估方法  

Stochastic Estimation Method of Voltage Sags in Complex Distribution Systems

作　　者：李庚银[1] 杨晓东[1] 周明[1] 

机构地区：[1]华北电力大学电力系统保护与动态安全监控教育部重点实验室,北京102206

出　　处：《电工技术学报》2009年第11期134-141,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(70773039);国家重点基础研究发展计划(2009CB219706);高等学校学科创新引智计划(B08013)资助项目

摘　　要：新型输配电技术的发展以及现代电力用户对电能质量要求的不断提高,使得电压暂降的分析、评估成为当前电能质量研究中的一项重要内容。本文提出系统重构法(RCS)进行复杂配电网的电压暂降随机预估。RCS方法是直接法的延伸,通过对重构系统的潮流计算直接求解电压暂降计算式中的系数项,分别计算三相短路故障、单相接地故障、两相接地故障和相间故障4种故障类型下的电压暂降凹陷域和相应的评估指标。对IEEE-30节点系统的分析和计算证明,本文方法适用于大规模复杂配电系统的电压暂降随机预估。With the development of new transmission and distribution techniques and rising requirement of modern consumers for better power quality, the voltage sag analysis and assessment has become an important research subject in power quality presently. In this paper the reconfiguration system （RCS）method, which derives from the direct method, is proposed for the voltage sag estimation in complex distribution systems. The coefficients of the voltage sag expression are calculated directly from the power flow calculation of reconfiguration system with RCS method. The areas of vulnerability and expected sag frequency （ESF） indices of sensitive load under three-phase short-circuit fault, single line-to-ground fault, double line-to-ground fault and line-to-line fault are calculated respectively. It is proved by IEEE 30-bus system that the RCS method is suitable for stochastic estimation of voltage sag in large distribution systems.

关 键 词：电压暂降 随机预估 凹陷域 系统重构 潮流计算 

分 类 号：TM712[电气工程—电力系统及自动化]