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It is being suggested a method of static power quality factors' standard values formation, such as voltage unbalance factors on negative and zero sequences of three-phase voltages, and voltage deviation of the positive sequence. The formation of the above mentioned factors is being fulfilled in two stages. At first, with use of the digital-to-analog method it is being formed three three-phase voltages...
Dependence of stator current from slipping for induction motor powered by a pulsed voltage source was analyzed. Slipping dependence for higher harmonic components of induction motor from the fundamental and carrier signals frequency was considered. A method for calculating the stator current of the induction motor by a predetermined supply voltage was proposed.
A possibility of application of power harmonic analysis method to an electrohydraulic complex with nonlinear processes in the pipeline system is demonstrated. It is determined that nonlinear processes in a hydraulic network, caused by cavitation self-oscillations, result in periodical stationary oscillations of power, are accompanied by increase of its variable component. To assess the processes of...
This paper presents a simulation and experimental study on one of the most common control strategy, direct power control (DPC), for three phase shunt active power filter. The main aims of the proposed strategy are to minimize or eliminate the impacts of the unwanted harmonics, and compensate the reactive power derived by the non-linear loads. The simulation and the experimental results obtained in...
Usefulness of a bipolar pulse-frequency modulation (PFM) for DC-AC power converters with transformers are shown. The signal spectrum analyzing on the basis a double Fourier series are proposed. A separation of the bipolar PFM signal on two unipolar signals is developed. A time transform for the dependency of the bipolar PFM and a pulse-width modulation (PWM) is proposed. The effectiveness of the bipolar...
The certain embodiments of adjustable power line conditioners (APLC), comprised in autonomous electric power systems (EPS) with powerful semiconductor converters, was considered in this article. The basic equations for the calculation of main parameters and characteristics of APLC were presented. The comparative analysis of the embodiments of APLC was performed based on the results of computer simulation...
The method of improving the quality of the matrix converter (MC) input current for the case of unbalanced load has been considered. This assumes that the supply voltages, as well as the generated MC output voltages, are symmetrical and sinusoidal (neglecting high-frequency components owing to the discrete nature with a pulse-width modulation frequency). The proposed and investigated method is based...
The structure and operation principles of power supply for AC arc welding with thyristor regulation of welding current and additional inductor were described. The analysis of harmonic spectrum of welding current was carried out. The dependence of power quality on current regulation angle was studied.
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