基于支路电压方程的在线电压稳定指标  

A New On-Line Voltage Stability Index Based on Voltage Equation of the Branch

作　　者：薛安成 刘瑞煌 李铭凯[1,2] 毕天姝 蒲天骄[3] 

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京102206 [2]国网北京市电力公司电力科学研究院,北京100075 [3]中国电力科学研究院,北京100192

出　　处：《电工技术学报》2017年第7期95-103,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51477050;51190103)

摘　　要：提出一种基于支路电压方程的电压稳定指标,该指标具有显式表达式,可结合PMU量测实现在线计算和应用。首先,利用电压功率灵敏度在电压崩溃点趋于无穷大的特性,推导获得该指标。其次,通过分析静态负荷特性对该指标假设条件(即P-V曲线电压崩溃点处特性)的影响,揭示了该指标对静态负荷特性的适应性,并用单支路系统进行了仿真验证。进一步,采用多支路系统验证了该指标可有效表征支路电压的稳定性,且具有较高的适用性。最后,探讨了应用等效方法改进该指标,从而提升多节点系统中该指标准确性的方法,并用10节点系统验证了改进指标的有效性。This paper proposes a new on-line voltage stability index based on the voltage equation of the branch. The proposed index has an explicit expression,which can be calculated with the on-line PMU data,and is suitable for online applications. First,the paper derives the index with the characteristic that the sensitivity of voltage to power tends to be infinite at the voltage collapse point. Then,it discusses the impacts of load characteristic on the proposed index,and the simulation results with the single-branch system reveals the adaptability of the proposed index to the static load. Furthermore,it presents the simulation results in multibranch system to verify the effectiveness of the proposed index. Finally,it discusses the improvement to the proposed index with the equivalence method,and the enhancement of the effect of the improved index is verified with the simulation results in a 10-bus system.

关 键 词：电压稳定指标 支路电压方程 灵敏度 在线应用 

分 类 号：TM712[电气工程—电力系统及自动化]