中国电力 ›› 2014, Vol. 47 ›› Issue (5): 44-47.DOI: 10.11930/j.issn.1004-9649.2014.5.44.3

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基于戴维南参数等值的电压稳定性分析

付正鑫1, 卢继平1, 乔梁2, 李军2   

  1. 1. 重庆大学 电气工程学院 输配电装备及系统安全与新技术国家重点实验室,重庆 400044;
    2. 重庆电力调度控制中心,重庆 400014
  • 收稿日期:2014-02-12 出版日期:2014-05-31 发布日期:2015-12-21
  • 作者简介:付正鑫(1987-),男,山东济宁人,硕士研究生,从事电力系统运行与控制、水电站经济运行研究。E-mail: 936309008@qq.com
  • 基金资助:
    输配电及系统安全与新技术国家重点实验室自主研究项目(重庆大学)(2007DA10512712205)

Voltage Stability Analysis Based on Thevenin Equivalent Parameters

FU Zheng-xin1, LU Ji-ping1, QIAO Liang2, LI Jun2   

  1. 1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology, College of Electrical Engineering ,Chongqing University, Chongqing 400044, China;
    2. Dispatching Control of Chongqing Electric Power, Chongqing 400014, China
  • Received:2014-02-12 Online:2014-05-31 Published:2015-12-21
  • Supported by:
    This work is supported by State Key Laboratory of Power Transmission Equipment &System Securiey and New Technology (Chongqing University) (2007DA10512712205)

摘要: 通过节点修正导纳矩阵的逆矩阵和离线潮流的解,得到所研究节点的自阻抗和该节点的开路电压,即是两节点网络的等效阻抗和等值电源。在系统网络化简的基础上,对电压稳定性指标进行了推导,该指标能够对节点电压稳定性及稳定程度有明确的判断。求解过程中充分考虑了发电机电源的内阻抗和节点负荷的影响,而且求解方法简单,适用范围广,避免了以往戴维南参数求解过程中出现的零点漂移问题和网络变化导致的戴维南参数误差较大情况。通过算例仿真验证了此方法的正确性。

关键词: 电力系统, 阻抗矩阵, 节点电压, 电压稳定指标

Abstract: Through the inverse matrix of the nodes admittance matrix and the off-line solution of power flow, the node’s self-impedance and open-circuit voltage can be gotten respectively, which are the equivalent impedance and source of the two-node network. On the basis of the simplification network, the voltage stability indices were deduced, by which an clear judgment on node voltage stability and its degree can be obtained. In the solving process of the equivalent model of two-node network, the influences of generator’s power resistance and load were taken into account, which made the method simple, widely applied. Furthermore, it can avoid the zero drift in Thevenin solution and larger error when the network has changed.

Key words: power system, impedance matrix, node voltage, voltage stability indicator

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