Research on forced oscillations disturbance source locating through an energy approach
Research on forced oscillations disturbance source locating through an energy approach
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能量法受迫振荡扰动源定位研究
DOI：
10.1002/etep.2080
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发表时间：
2016
影响因子：
2.3
通讯作者：
Guo Ke
中科院分区：
文献类型：
--
作者：
Tang Fei;Wang Bo;Liao Qingfen;Pisani Cosimo;Dong Chao;Jia Jun;Guo Ke
低频振荡（LFO）是现代互连电力系统的固有现象，本质上是由旋转质量之间的连续动量交换引起的。人们普遍认为，多重扰动的发生和周期性扰动源的存在都会引起低频振荡。 LFO 可分为负阻尼振荡和强制功率振荡。前者可以通过标准控制器（例如电力系统稳定器）来抑制。后者只有在干扰源被移除或隔离后才能消除。因此，及时、准确地定位强迫扰动源至关重要。本文对传统的能量函数进行简化和改进，提出一种新的分解方式来显示能量流的方向。与 LFO 相关的能量被分解为振荡分量和准稳态分量，以分析引起的多重干扰。因此，分支能量被分解为周期性和非周期性分量。通过识别非周期分量传播和消散的方向，可以快速、准确地定位周期性强迫扰动源。所提出的能量分解方法提供了一种判断耗散能量流动方向的新思路。通过对我国实际大规模互联电网的仿真结果验证了该方法的有效性和可行性。版权所有 © 2015 约翰·威利父子有限公司
Low‐frequency oscillations (LFOs) are inherent phenomena of modern interconnected electrical power systems, essentially caused by the continuous exchange of momentum among rotating masses. It is widely recognized that LFOs can be induced by both the occurrence of multiple disturbances and the existence of periodic disturbance sources. LFOs can be classified into negative damped oscillations and forced power oscillations. The former can be suppressed by standard controllers (e.g., power system stabilizers). The latter cannot be eliminated until the disturbance source is removed or isolated. Thus, locating the forced disturbance source promptly and accurately is crucial.In this paper, a traditional energy function, simplified and improved, with a new decomposition way to show the direction of energy flow is proposed. Energy associated with the LFO is decomposed into oscillating component and quasi‐steady component at the aim of analyzing the inducing multiple disturbances. The branch energy is hence decomposed into periodic and aperiodic components. By identifying the direction along which the aperiodic component is propagated and dissipated, the periodic forced disturbance source could be located rapidly and accurately. The proposed energy decomposition method provides a novel idea to judge the direction along which the dissipated energy flows. The effectiveness and feasibility of the proposed method were verified by simulation results obtained on an actual large‐scale interconnected power grid in China. Copyright © 2015 John Wiley & Sons, Ltd.