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The paper deals with a series of issues relative to power quality in drive systems and the behavior of a load composed from a uncontrolled rectifier, chopper and a DC motor. A MATLAB-Simulink scheme was designed in order to study the possibility to eliminate the unwanted power-related effects from the system. An equipment having the role of active filter is modeled and studied. The active filter is...
The paper is concerned with aspects related to the reactive power compensation capacitors influence over the current and voltage distortions. This work aims to discover if the use of capacitors for the reactive power compensation have more drawbacks than positive effects. A solution of compensation is modeled and simulated in the MATLAB/Simulink software environment. The compensation algorithm is...
The paper deals with the problems introduced by a fully controller rectifier with thyristors (FCTR), used in the supplying circuit of a power plant's excitation winding. The rectifier is supplied from the secondary winding of a 3.256 MVA, 24 / 0.65 kV power transformer (PT), in a schema modified with respect to the excitation supplying from an auxiliary generator. The use of PT supplied from the main...
The paper deals with problems related to non-sinusoidal regimes introduced in the supplying network by a laptop and respectively by a set of laptops connected in various configurations. The three-phase voltage(s) and current(s) were acquired with an original data acquisition system with a sampling frequency of 19,200 Hz. Harmonic decompositions up to an order of 192 (corresponding to a frequency of...
The paper deals with the Discrete Wavelet Transform (DWT) analysis of quasi-stationary regimes (with small variations of magnitude and harmonic contents) in three-phase systems. The analyzed data, acquired on stand, correspond to a driving system using chopper and DC motor. Unfiltered currents are included in the first data set, unlike those from the second set. The harmonic orders to be filtered...
This paper presents a comparison of the performances related to compensation and transient response of active and passive power filters when operation relies on distorted mains voltages. MATLAB/Simulink models are used. Measurements acquired with a dedicated data acquisition system provided the parameters required by the real system simulation, namely a static excitation system of a power generator...
The paper presents some problems and solutions for instantaneous power theory applied to active power conditioning under distorted mains voltages in a MATLAB/Simulink approach. Simulation of a real system is made, namely a transformer which feeds a controlled rectifier bridge in an excitation system from a power system generator group, based on measurements acquired with a dedicated data acquisition...
The discussed class of original hybrid wavelet algorithms is analyzed firstly relative to the decomposition vectors shape and periodicity in stationary regime. The studied signal corresponds to a current from the supplying network and has medium distortions within its first 4 periods, the other 2 being seriously affected after a fault. The noticed differences are responsible for different decomposition...
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