Harmonics measurement using FFT algorithm in digital signal controller for smart micro-grid system

Abstract

Presently various data processing techniques have been proposed for measuring the power quality parameters, this paper puts forward a method focusing on speed of computation and accuracy of detection of Harmonics in smart Micro-Grid systems. Mostly all Micro-grids today have large penetration of renewable energy sources and power electronic converters which are source of harmonics due to their non-linear property and hence monitoring of the total distortion level because of these sources are very necessary. This paper shows the results of designed hardware circuit using digital signal controller (DSC) dsPIC30f3011 and getting the results from software-MPLAB on real time voltage signal from distribution electricity board. Taking advantage of the speed of computation Fast Fourier Transform (FFT) has been used as its main processing algorithm. This paper shows the actual results of application of FFT on data obtained from power supply and determining up to 30th harmonics, the output results clearly reflect the methods effectiveness in determining harmonics to a fair level of accuracy, speed and as a substitute for high cost determining techniques. The obtained Fast Fourier Transform results computed through MPLAB has been compared with MATLAB result to verify the accuracy level of the adopted technique.