CAJ | 학술논문

低频振荡发生时，准确判别低频振荡的类型，对抑制低频振荡、降低其危害具有重要的意义。文中在分析各种机理低频振荡的振荡曲线特征的基础上，提出了基于包络线拟合的振荡性质判别方法。首先，通过经验模态分解(EMD)方法，提取出振荡信号的主导模式振荡曲线，然后通过对提取出的主导模式信号的包络线进行拟合，根据拟合误差判别出振荡的类型。给出了性质判别的流程和实现方法，并通过仿真案例和广域测量系统记录的实际案例，验证了所提出方法的有效性。
저빈진탕발생시，준학판별저빈진탕적류형，대억제저빈진탕、강저기위해구유중요적의의。문중재분석각충궤리저빈진탕적진탕곡선특정적기출상，제출료기우포락선의합적진탕성질판별방법。수선，통과경험모태분해(EMD)방법，제취출진탕신호적주도모식진탕곡선，연후통과대제취출적주도모식신호적포락선진행의합，근거의합오차판별출진탕적류형。급출료성질판별적류정화실현방법，병통과방진안례화엄역측량계통기록적실제안례，험증료소제출방법적유효성。
Accurately detecting the properties of low-frequency oscillation is important to suppressing power system oscillations and reducing its harms during a low-frequency oscillation.By an analysis of the characteristics of low-frequency oscillation curves with different mechanisms,this paper presents an oscillation property identification method based on envelope fitting. Firstly,the dominant mode oscillation curve of the vibration signal is extracted by the empirical mode decomposition (EMD) method.Then the envelope of the dominant mode signal extracted is fitted.Based on the fitting error,the properties of oscillations are determined.The process and the realization method for property identification are given.The validity of the method proposed is verified through both simulation data and actual data recorded by the wide area measuring system. This work is supported by State Grid Corporation of China,Major Projects on Planning and Operation Control of Large Scale Grid(No.SGCC-MPLG019-2012),Fundamental Research Funds for the Central Universities (No.2014MS88),and Hebei Provincial Natural Science Foundation of China(No.E2011502014).