The Comparison Study of Harmonic Detection Algorithms for Single-Phase Power Systems

This paper presents a comparison study of harmonic detection algorithms for single-phase power systems. The three harmonic detection algorithms are compared, instantaneous reactive power (PQ), synchronous reference frame (SRF) and sliding window with Fourier analysis (SWFA). These algorithms are used to calculate the reference current of a shunt active power filter. For testing the algorithms performance, MATLAB/Simulink is used to simulate the harmonic elimination system with two cases of voltage source, the pure sinusoidal voltage source and the distorted voltage source. The factors to indicate the harmonic detection performance are the total harmonic distortion percentage of current (%THDi) and power factor (PF) values of source current after compensation. The simulation results show that the SWFA provides the best %THDi compared with the PQ and SRF algorithms in both two cases voltage source. Furthermore, the PQ and SRF algorithms can improve the power factor of electric system.