Abstract
This paper deals with the adaptive control mechanism management meant for shunt active power filters (SAPF). Systems driven this way are designed to improve the quality of electric power (power quality) in industrial networks. The authors have focused on the implementation of two basic representatives of adaptive algorithms, first, the algorithm with a stochastic LMS (least mean square) gradient adaptation and then an algorithm with recursive RLS (recursive least square) optimal adaptation. The system examined by the authors can be used for non-linear loads for appliances with rapid fluctuations of the reactive and active power consumption. The proposed system adaptively reduces distortion, falls (dip) and changes in a supply voltage (flicker). Real signals for measurement were obtained at a sophisticated, three-phase experimental workplace. The results of executed experiments indicate that, with use of the certain adaptive algorithms, the examined AHC system shows very good dynamics, resulting in a much faster transition during the AHC connection-disconnection or during a change in harmonic load on the network. The actual experiments are evaluated from several points of view, mainly according to a time convergence (convergence time) and mistakes in a stable state error (steady state error) of the investigated adaptive algorithms and finally as a total harmonic distortion (THD). The article presents a comparison of the most frequently used adaptive algorithms.
Highlights
The active harmonic compensation AHC [1], which is intended to compensate the harmonic flow generated by the powerful electronics, is being used more and more often in the industrial applications [2]
The authors of this article have primarily focused on adaptive filters [20] from the viewpoint of adaptive algorithms utilized [13] in order to improve efficiency of the Active Power Filters - APF [23]
total harmonic distortion (THD) is a quantity that defines the distortion sine wave. It is defined as a ratio of the all harmonic components total power to the fundamental harmonic performance The lower the THD is, the more constant is the signal
Summary
The active harmonic compensation AHC [1], which is intended to compensate the harmonic flow generated by the powerful electronics, is being used more and more often in the industrial applications [2]. The authors of this article have primarily focused on adaptive filters [20] from the viewpoint of adaptive algorithms utilized [13] in order to improve efficiency of the Active Power Filters - APF [23]. This article concentrates on the adaptive control method - ACM [7] designed for the APF, especially from perspective of the examining the performance data of adaptive algorithms used. Real data were obtained at the earlier mentioned three-phase experimental workplace, see Picture 3
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