A Harmonic Detection Strategy Based on FBD Power Theory

The stability, safety and economic operation of the power system are threated by harmonic pollution. Moreover, a series of harmonic currents and unbalanced load currents are affecting the power quality seriously. The active power filter is mainly used to compensate the harmonic current. However, the compensation effect is affected by the dynamic response speed of harmonic current detection. In this paper, the FBD(Fryze-Buchholz-Dpenbrock) theory and its derived harmonic detection method, and the deficiency in dynamic response of the low-pass filter and the Moving Average Filter (MAF) are introduced and analysied, respectivly. Then, an improved Generalized Moving Average Filter (GMAF) is proposed to improve the dynamic response speed of harmonic detection. Finally, based on FBD power theory, a single-phase and three-phase simulation model is built in MATLAB/Simulink, and the simulation results of two methods under steady state and load current mutation are given, and the characteristics of GMAF’s dynamic response speed are verified.