Detection of Harmonics in Distribution System using FFT with Case Studies

In recent years, PQ (power quality) problem makes quality of power supply drop, which even triggers power accident, so PQ has attracted widespread attention. In this paper we deal with the power quality problem- harmonics. Two different combinations of the load are taken with linear and non-linear. A MATLAB program is designed to calculate total harmonic distortion of the system using FFT(fast fourier transform). In the paper, the disturbances specially harmonics present in the power systems are detected with equipment like `power analyzer` or ‘digital signal oscilloscope’ The values of the power signal obtained from above method are then inserted into the Simulink or MATLAB program and the signal is analysed on parameters and these results are finally cross-verified with the result obtained from above devices. The simulation results and the theoretical analysis show that the model in this paper could simulate the harmonic disturbance well, which can provide data and basis for detection and identification of PQ and further control measures.