摘要
持续的周期性小扰动会引发电力系统强迫功率振荡,其共振时的稳态表现形式与系统弱阻尼自由振荡非常相似。文中基于线性化的系统运动方程建立能量函数,分析了强迫功率振荡共振稳态时线性化系统中的能量转换特性,从能量变化的角度阐述了强迫功率振荡与系统弱阻尼自由振荡的区别。通过对2机系统的分析,阐述了借助系统中的能量转换特性识别强迫功率振荡扰动源所在位置的基本原理。基于结构保留的多机系统,将能量函数推广到关键支路和节点,以借助网络动态信息在线识别强迫功率振荡扰动源的大致方向或位置。4机2区系统和新英格兰10机39节点系统的仿真算例验证了所提出的方法的有效性。
The power system forced power oscillation will be excited by the continuous cyclical small power disturbances.Its steady-state response during resonance is very similar to the response of the traditional weak damping low frequency oscillation.The energy conversion characteristics of the forced power oscillation in a linear system during the steady-state resonance is analyzed firstly using energy functions with the linear equations of motion of the rotor.Using this energy conversion theory,the difference between these two kinds of oscillations is obtained.Then,basic principles to identify the disturbance source of the forced power oscillation by energy function of linear system are proposed with a two-machine system.Finally,based on the structure preserving model of multi-machine power systems,the energy function is extended to the key branches and buses,which is useful to online identify the direction or location of the disturbance source of the forced power oscillation by simply using the network dynamic information.The simulation results of both the 4-machine 2-area system and the New England 10-machine 39-bus system indicate the feasibility and validity of the proposed method.
出处
《电力系统自动化》
EI
CSCD
北大核心
2010年第5期1-6,共6页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(50877042)~~
关键词
低频振荡
强迫功率振荡
能量函数
广域测量系统
扰动源定位
low frequency oscillation
forced power oscillation
energy function
wide area measurement system（WAMS）
disturbance source location
作者简介
余一平（1977-），男，通信作者，博士研究生，主要研究方向：电力系统安全稳定分析。E—mail：yuyp06@mails．tsinghua．edu．cn
闵勇（1963-），男，教授，博士生导师，主要研究方向：电力系统安全稳定分析与实时监控技术。
陈磊（1982-），男，博士，现在博士后流动站从事研究工作，主要研究方向：电力系统安全稳定分析。
