| 引用本文: | 李阳海,黄莹,刘巨,姚伟,文劲宇.基于阻尼转矩分析的电力系统低频振荡源定位[J].电力系统保护与控制,2015,43(14):84-91.[点击复制] |
| LI Yanghai,HUANG Ying,LIU Ju,YAO Wei,WEN Jinyu.Power system oscillation source location based on damping torque analysis[J].Power System Protection and Control,2015,43(14):84-91[点击复制] |
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| 摘要: |
| 准确定位低频振荡参与机组并采取有效的控制措施以提高系统阻尼、快速平息系统振荡是大电网安全稳定运行的重要保障。为此，提出了一种基于总体最小二乘-旋转不变技术的信号参数估计(TLS-ESPRIT)和阻尼转矩分析(Damping Torque Analysis，DTA)方法进行低频振荡发生源定位的方法。该方法利用TLS-ESPRIT对发电机组的有功出力、角速度、功角信号进行模式分解，提取发电机高度参与的振荡模式，采用最小二乘拟合方法计算发电机高度参与振荡模式的阻尼转矩系数，然后根据阻尼转矩系数判定发电机是否为该振荡模式的振荡源。分别以4机2区和10机39节点系统为例进行仿真验证。仿真结果表明，所提出的振荡监测方法能够准确定位电力系统低频振荡源，且通过振荡源对其自身的控制能够有效地平息系统中的低频振荡现象。 |
| 关键词: 阻尼转矩分析 TLS-ESPRIT 多机电力系统 低频振荡源定位 |
| DOI：10.7667/j.issn.1674-3415.2015.14.013 |
| 投稿时间：2014-10-01修订日期：2015-01-23 |
| 基金项目:国家自然科学基金资助项目(51177057) |
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| Power system oscillation source location based on damping torque analysis |
| LI Yanghai,HUANG Ying,LIU Ju,YAO Wei,WEN Jinyu |
| (State Grid Hubei Electric Power Research Institute, Wuhan 430077, China;State Key Laboratory
of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China) |
| Abstract: |
| Locating low frequency oscillation sources exactly and taking appropriate control measures to enhance system damping and suppress system oscillations are an important guarantee for the secure and stable operation of power grids. Therefore, this paper proposes an effective oscillation source location method based on a total least squares-estimation of signal parameters via rotational invariance techniques (TLS-ESPRIT) and damping torque analysis (DTA) for the power systems. In this method, the dominant oscillation mode of each generator is extracted from measured signals (e.g. rotor speed, rotor angle, and active power) at its side by means of TLS-ESPRIT, and then corresponding damping torque coefficient can be obtained through the least square fitting method to determine whether the generator is the oscillation source of this oscillation mode. Finally, case studies are carried out on the 4-machine 2-area system and 10-machine New England test system, respectively. Simulation results indicate that the proposed locating method can accurately locate the power system oscillation source, by which low-frequency oscillation can be effectively restrained using local control measures. |
| Key words: damping torque analysis TLS-ESPRIT multi-machine power system low frequency oscillation location |
