电压薄弱节点的在线识别与控制方法  

An Analytical Method for Online Identification and Control of Voltage Weak Buses

作　　者：牟晓明[1] 李志民[1] 

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,黑龙江省哈尔滨市150001

出　　处：《电网技术》2012年第8期163-168,共6页Power System Technology

基　　金：国家高新技术研究发展计划(863计划)项目(2011AA05A105)~~

摘　　要：快速准确地识别电压薄弱节点并执行相应的控制措施,是防御电力系统电压失稳的一项重要工作。首先,在对电力网络进行等值和解析的基础上,建立了识别节点电压薄弱性的解析指标,该指标具有明显的物理意义,反映了负荷节点电压与所有负荷电流在相应网络阻抗上引起的累积电压降的比值。然后将节点电压薄弱性指标分解为与各负荷节点相对应的贡献度指标,利用贡献度指标可以解析地识别导致节点电压薄弱的关键因素,并能给出相应的控制措施。IEEE 118节点系统仿真结果表明,与模式分析方法相比,所提方法计算结果准确,能有效识别出与所有关键模式相对应的各个薄弱节点,并能给出减轻节点薄弱性的控制措施。It is a significant task to quickly identify voltage weak buses and implement the corresponding control measures to prevent power systems voltage instability events. Firstly, based on the equivalence and analysis of power network an analytical index is proposed for online identification of voltage weak buses. The proposed index possesses evident physical meaning： for a certain loaded bus, the proposed index is the ratio of the sum of voltage drop caused by its own load current on the self-impedance and voltage drops, which are in the form of induced potentials, caused by load currents of other buses on mutual impedances to the voltage of loaded bus. Then the proposed index is decomposed into a set of sub-indices, namely the contribution indices, and each contribution index describes the relative contribution extent of other load buses to the voltage weakness of a certain load bus. Key factors weakening the voltage of a certain load bus can be analytically identified by contribution indices, so corresponding control measures can be determined. Simulation results of IEEE 118-bus system show that comparing with the modal analysis method the proposed method can identify all weak buses related to all key modes accurately and effectively, and the control measures to mitigate the voltage weakness of load buses can be given.

关 键 词：电力系统 电压稳定 薄弱节点 在线识别与控制 

分 类 号：TM712[电气工程—电力系统及自动化]