摘要
基于相量测量单元(phasor measurement unit,PMU)的广域测量系统(wide area measurement system,WAMS)为在线电压稳定估计提供了新的思路和方法。采用π型支路模型,利用同步测量数据推导了可用于高压电网的支路在线电压稳定指标,从物理意义层面将该指标解释为虚拟有功裕度指标IVAM,并提出了一种改进的考虑某一断面IVAM变化趋势的实时电压稳定预测指标。IEEE14节点算例和某省实际电网算例验证了该指标的准确性。改进的电压稳定预测指标算法结构简单、准确度高,便于实现在线应用。
The phasor measurement unit （PMU） based wide area measurement system （WAMS） provides a new thought and method for online voltage stability prediction. Adopting the n-type of branch model and by use of synchronous phasor measurement data, the voltage stability index based on branch power flow that can be used to HV power network is derived. In the viewpoint of physical meaning, the derived index can be explained as virtual active power margin index IVAM and an improved real-time voltage stability prediction index, which considers the IVAM variation of a certain tie line, is proposed. Calculation results of IEEE 14-bus system and that of a certain provincial power network show that the proposed index is accurate. The proposed improved voltage stability prediction algorithm is accurate and simple in structure, and it is easy to realize its online application.
出处
《电网技术》
EI
CSCD
北大核心
2011年第7期118-122,共5页
Power System Technology
关键词
电压稳定
广域测量系统
支路潮流
在线电压稳定指标
voltage stability
wide area measurementsystem
branch power flow
on-line voltage stability index
