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Detection of harmonic in power system based on TT-transform

Rapid and correct detection of harmonics is the premise of suppressing harmonics in power system, 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, and the start and end time of transient state, 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-interference performance.