Complex atom transform‐based scheme for detection of subsynchronous oscillations. (6th December 2013)

• Record Type: Journal Article
• Authors: Liu, Lin; Lin, Tao; Xu, Xialing; Yu, Guangzheng; Chen, Rusi
• Is Part Of: International transactions on electrical energy systems. Volume 25:Number 2(2015:Mar.)
• Page Start: 233
• Page End: 245
• Publication Date: 2013-12-06
• Subjects: Electric power -- Periodicals; Electric power systems -- Periodicals; Electrical engineering -- Periodicals; 621.3
• DOI: 10.1002/etep.1838
• Languages: English
• ISSNs: 2050-7038

Abstract

<abstract abstract-type="main"> <title>Summary</title> <p>A novel scheme based on the complex atom transform (CAT) for detection of subsynchronous oscillations (SSO) is proposed in this paper. SSO components and the fundamental are closely spaced in frequency domain causing the possibility of aliasing. Some conventional SSO detection methods share the problems of low mode resolution and slow dynamic response. The CAT has flexible window in time–frequency domain. By adjusting the window of the CAT, the scheme can achieve high multi‐mode resolution, desirable accuracy and fast dynamic response when analyzing multi‐mode SSO waveforms to facilitate multi‐mode SSO suppression. First step of the scheme is to use the CAT to obtain oscillation frequencies and envelope curves of SSO waveforms. The least squares (LS) method is then deployed to measure initial oscillation amplitude and damping ratio from the envelope curve. The effectiveness and correctness of the proposed scheme are verified with simulations using both an artificially generated signal and the IEEE First Benchmark Model. Compared with the conventional methods, such as the continuous wavelet transform (CWT), the scheme has higher mode resolution, more desirable accuracy and faster dynamic response. In addition, the scheme is simple and the computation burden is low; thus, it is easy to be implemented for online application. Moreover, the CAT‐based scheme can also be used for synchrophasor measurements; hence, the scheme can be integrated into phasor measurement units (PMU), which are installed in generator terminals. Copyright © 2013 John Wiley & Sons, Ltd.</p> </abstract>