VMD based mode identification for broad-band oscillation in power system
DOI:10.7667/PSPC201861
Key Words:broad-band oscillation  mode identification  variational mode decomposition (VMD)  power system  low frequency oscillation  sub-synchronous oscillation
Author NameAffiliation
TANG Jihong State Grid Hunan Electrical Power Co., Ltd., Changsha 410007, China 
ZHU Junfei State Grid Hunan Electrical Power Co., Ltd., Changsha 410007, China 
LI Yong College of Electrical Information Engineering, Hunan University, Changsha 410082, China 
ZUO Jian Electric Power Research Institute of State Grid Hunan Electric Power Co., Ltd., Changsha 410007, China 
MA Junjie School of Information Science and Engineering, Central South University, Changsha 410083, China 
CHEN Chonggang School of Information Science and Engineering, Central South University, Changsha 410083, China 
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Abstract:Oscillation is one of the most important stability problems of modern power system. In a power system, multiple types of oscillation crossing a broad-band may occur at a same time. In this paper, the mode identification for broad-band oscillation signal is proposed. First, the signal is decomposed to signals of different frequency bands by band pass filters. Then, the mode signals of the decomposed signals are extracted by using Variational Mode Decomposition (VMD) method. The mode parameters can be identified from the mode signals by Prony algorithm. The simulation and case study show that this method can distinguish and extract different kinds of oscillation modes of signals effectively and identify each mode’s information accurately. It can accurately identify mode information from both oscillation signal and damped oscillation in ambient noise. This work is supported by National Natural Science Foundation of China (No.51520105011) and Science and Technology Project of State Grid Hunan Electric Power Company Limited (No. 5216A5170012).
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