Abstract
This article is devoted to the problems of normalizing the quality of electricity in urban electrical networks with a voltage of 0.4 kV. In recent years, electrical receivers that have a nonlinear volt-ampere characteristic (VAC) have appeared among household consumers. In their turn, these electrical receivers with a nonlinear I-V characteristic are sources of harmonic components of the current and thereby cause distortion of the shape of the current and voltage curve, worsening the quality of electricity in electric networks for municipal purposes. In this regard, the problems of compensation of higher harmonic components of current and voltage in 0.4 kV electrical networks still remain relevant. The article proposes a calculation of FCU selection for compensation of higher harmonic currents (HH) and normalization of voltage curve shape distortion coefficients as indicators of electric power quality in public utility networks is proposed. The simulation model of the power supply system for public utilities is developed in the Matlab/Simulink software environment to determine the coefficients characterizing the non-sinusoidality of current and voltage. The level of coefficients characterizing the distortions of the voltage curve shape in the power supply systems of a real (operating) public utility facility is obtained. The calculation and selection of filter compensating devices (FCD) in municipal utility networks have been carried out. Based on a simulation model of the power supply system of a real utility facility, the effectiveness of using FCD for compensating HH currents has been proven. After calculating and selecting passive FCDs on the developed model, the value of the total harmonic component coefficient for the voltage in the network decreased by 10.7 times, and the use of active FCDs by 17.2 times.
Keywords
non-sinusoidality, power quality, modeling, Simulink, voltage, current, filter compensating devices, passive filter, active filter
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