|Detection of harmonic in power system based on TT-transform|
【Title】Detection of harmonic in power system based on TT-transform
【Abstract】Rapid and correct detection of harmonics is the premiseof suppressingharmonicsin powersystem, and is also of great significance to the improvement of power quality. A new detection method for the harmonics based on TT-transform (Time-Time Transform) is proposed in this paper. In view of the instantaneous data of the power system, TT-transform is firstly used and diagonal element of the transformation result is got, then, FFT transform is used on diagonal element to extract the characteristic quantities of harmonics such as harmonic order, amplitude,andthestartandendtimeoftransientstate, etc. The fundamental principle and characteristics of TT-transform are firstly presented, and then the detection method of harmonics in power system based on TT-transform is elaborated in detail. Finally, the steady harmonics, transient harmonics and the harmonics with noise are simulated respectively. The simulation results verify the efficiency of the proposed method, and show that it is also characterized by simple utilization, high accuracy, and good anti-interferenceperformance.
【Keywords】harmonics, power system, TT-transform, FFT transform, steady harmonics, transientharmonics,harmonicswithnoise【Author】
|LI Ning||: School of Automation and Information Engineering, Xi’an University of technology, Xi'an 710048, Shaanxi Province，China;|
|XU Jiayun||: Shanghai Marine Equipment Research Institute, Shanghai 200031, Shanghai, China;|
|MAN Weishi||: School of Automation and Information Engineering, Xi’an University of technology, Xi'an 710048, Shaanxi Province，China;|
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