A Method for Subsynchronous Oscillation Detection Using Frequency Slice Wavelet Transform
Zhao Yan1, Li Wujing2, Nie Yonghui1
1. School of Power Transmission and Distribution Technology Northeast Electric Power University Jilin 132012 China; 2. School of Electrical Engineering and Automation Harbin Institute of Technology Harbin 150001 China
Abstract：It is hard to use the existing methods to effectively identify subsynchronous oscillation (SSO) of power system. Most methods are sensitive to noise, and it is difficult to obtain the characteristic and development trend of oscillation. In this paper, a method using Frequency Slice Wavelet Transform (FSWT) is proposed for analysis and parameter identification of SSO. FSWT can cut time-frequency areas freely, so that full band time-frequency distribution analysis and fine analysis can be realized. Firstly, SSO signal is decomposed by FSWT and the full band of its time-frequency distribution is obtained. After that,due to its energy distribution, the occurrence of SSO can be predicted, and determined the number and frequency slices of modal components can be determined. Through reconstructing signals in characteristic frequency slices, separation and extraction of SSO mode components are realized. Finally, high-accuracy detection for modal parameter identification is achieved by the Hilbert transform.
赵妍, 李武璟, 聂永辉. 次同步振荡的频率切片小波变换检测方法[J]. 电工技术学报, 2017, 32(6): 106-114.
Zhao Yan, Li Wujing, Nie Yonghui. A Method for Subsynchronous Oscillation Detection Using Frequency Slice Wavelet Transform. Transactions of China Electrotechnical Society, 2017, 32(6): 106-114.
[1] 岑炳成, 刘涤尘, 董飞飞, 等. 抑制次同步振荡的SVC非线性控制方法[J]. 电工技术学报, 2016, 31(4): 129-135. Cen Bingcheng, Liu Dichen, Dong Feifei, et al. Nonlinear control method of static var compensator for damping subsynchronous oscillation[J]. Transa- ctions of China Electrotechnical Society, 2016, 31(4): 129-135. [2] 张剑, 肖湘宁, 高本锋, 等. 双馈风力发电机的次同步控制相互作用机理与特性研究[J]. 电工技术学报, 2013, 28(12): 142-149. Zhang Jian, Xiao Xiangning, Gao Benfeng, et al. Mechanism and characteristic study on sub- synchronous control interaction of a DFIG-based wind-power generator[J]. Transactions of China Electrotechnical Society, 2013, 28(12): 142-149. [3] 李宽, 李兴源, 胡楠, 等. 基于经验模态分解自适应滤波的次同步振荡ESPRIT分析[J]. 电力系统保护与控制, 2012, 40(13): 18-23. Li Kuan, Li Xingyuan, Hu Nan, et al. ESPRIT analysis of subsynchronous oscillation based on the empirical mode decomposition self-adaptive filter[J]. Power System Protection and Control, 2012, 40(13): 18-23. [4] 文劲宇, 孙海顺, 程时杰. 电力系统的次同步振荡问题[J]. 电力系统保护与控制, 2008, 36(12): 1-4. Wen Jinyu, Sun Haishun, Cheng Shijie. Subsynchronous oscillation in electric power systems[J]. Power System Protection and Control, 2008, 36(12): 1-4. [5] 吴熙, 蒋平. SEDC与TCSC联合抑制次同步振荡的研究[J]. 电工技术学报, 2012, 27(4): 179-184. Wu Xi, Jiang Ping. Research on sub-synchronous oscillation mitigation using supplementary excitation damping controller and thyristor controlled series capacitor[J]. Transactions of China Electrotechnical Society, 2012, 27(4): 179-184. [6] 王义军, 张玉, 张卓林. 典型±660kV HVDC系统建模与运行仿真研究[J]. 东北电力大学学报, 2013, 33(1): 80-83. Wang Yijun, Zhang Yu, Zhang Zhuolin. Typical ±660kV HVDC modeling and operation simulation research[J]. Jouranl of Northeast Dianli University, 2013, 33(1): 80-83. [7] 李兴源. 高压直流输电系统的运行和控制[M]. 北京: 科学出版社, 1998. [8] Yan Z, Miyamoto A, Jiang Z. An overall theoretical description of frequency slice wavelet transform[J]. Mechanical Systems and Signal Processing, 2010, 24(2): 491-507. [9] Yan Z, Miyamoto A, Jiang Z. Frequency slice algorithm for modal signal separation and damping identification[J]. Computers and Structures, 2011, 89(1): 14-26. [10] Yan Z, Miyamoto A, Jiang Z. Frequency slice wavelet transform for transient vibration response analysis[J]. Mechanical Systems and Signal Pro- cessing, 2009, 23(5): 1474-1489. [11] 段晨东, 高强. 基于时频切片分析的故障诊断方法及应用[J]. 振动与冲击, 2011, 30(9): 1-5. Duan Chendong, Gao Qiang. Noval fault diagnosis approach using time-frequency slice analysis and its application[J]. Journal of Vibration & Shock, 2011, 30(9): 1-5. [12] 李天云, 谢家安, 张方彦, 等. HHT在电力系统低频振荡模态参数提取中的应用[J]. 中国电机工程学报, 2007, 27(28): 80-83. Li Tianyun, Xie Jiaan, Zhang Fangyan, et al. Application of HHT for extracting model parameters of low frequency oscillations in power systems[J]. Proceedings of the CSEE, 2007, 27(28): 80-83. [13] Ni J M, Shen C, Liu F. Estimation of the elec- tromechanical characteristics of power systems based on a revised stochastic subspace method and the stabilization diagram[J]. Science China Technolo- gical Sciences, 2012, 55(6): 1677-1687.
2017, Vol. 32 
