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The paper is concerned with power active filters of high harmonics control system. Shunt active filter generalized structure was investigated. A functional unit responsible for generating a distortion signal of the circuit currents is considered in the structure of the control system. Two ways of isolating the distortion signal are analyzed: the instantaneous power method and the notch filtering method. The instantaneous power method (p-q theory) assumes the use of the Clarke transformation for the transition from a single-phase system of currents and voltages to a two-phase system. Then, the active and reactive powers are calculated, the variable components of which are determined by the presence of higher harmonic components. The allocation of variable power components is necessary for calculating distortion currents from the beginning in a two-phase system, and after an inverse transformation, and in a three-phase coordinate system. The second method consists in filtering the notch filter tuned to the frequency of the first harmonic of the current, and thus obtaining a distortion signal. Structural diagrams of systems constructed according to the methods are studied. Research and comparison of the systems were carried out by the method of simulation modeling. As the simulation results, the spectral compositions of the compensated currents of the power supply system with consumers having nonlinear current-voltage characteristics are given. Also, the values of the non-sinusoidal current coefficients were obtained during the simulation. The analysis of the obtained results made it possible to draw a conclusion about the most preferable use of the notch filtering method in the structure of the active filter control system.


Control system, power active filter, simulation modelling, high harmonics compensation, instantaneous power theory, phase-locked loop.

Nikolay A. Zhukov

Teaching Assistant, Belgorod State Technological University named after V.G. Shoukhov, Belgorod, Russia. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..

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