scholarly journals OPTIMIZATION OF ACTIVE CORRECTOR ELEMENTS OF CURRENT FORM IN COMPOSITION OF HYBRID FILTER BY ALGORITHM OF SWITCHING OF INVERTER TRANSISTORS

2020 ◽  
Vol 2020 (6) ◽  
pp. 21-24
Author(s):  
V.M. Spirin ◽  
◽  
V.M. Gubarevich ◽  
P.P. Podieko ◽  
Yu.V. Marunya ◽  
...  
Keyword(s):  
Active Filter ◽  
Maximum Frequency ◽  
Hybrid Filter ◽  
Current Form ◽  
Cascade Connection

The algorithm for switching transistors of the inverter of the active corrector of current form is defined, which allow to reduce the maximum frequency of their switching or the inductance of the reactor of the active corrector of current form in a hybrid filter, which consists of a cascade connection of a parallel active filter and a series-parallel passive LMC-filter. References 10, figures 5.

scholarly journals POWER QUALITY IMPROVEMENT IN MATRIX CONVERTER USING HYBRID FILTER

2013 ◽  
pp. 155-159
Author(s):  
RASHMI S. PHASATE ◽  
ARCHANA BAWANKAR
Keyword(s):  
Quality Improvement ◽  
Power Systems ◽  
Power Quality ◽  
Matrix Converter ◽  
Active Filter ◽  
Hybrid Filter ◽  
Shunt Active Filter ◽  
Matrix Converters ◽  
The Matrix ◽  
Power Quality Improvement

This paper proposes a hybrid filter to minimize the power quality impact of matrix converters. Matrix converters inject significant harmonics and nonstandard frequency components into power systems. The hybrid filter is used to reduce the harmonics. A hybrid filter constructed of a shunt active filter and distributed passive filters used for power quality improvement. The proposed approach has been tested and validated on the matrix converter using Matlab/Simulink. The comparison of Simulation results for passive and active filter separately used with matrix converter with the result of matrix converter with hybrid filter is shown to demonstrate the advantages of the proposed scheme.

scholarly journals Performance comparison of hybrid active power filter for p-q theory and SVPWM technique

2021 ◽  
Vol 11 (1) ◽  
pp. 84
Author(s):  
T. M. Thamizh Thentral ◽  
K. Vijayakumar ◽  
R. Jegatheesan
Keyword(s):  
Pulse Width Modulation ◽  
Filter Design ◽  
Harmonic Distortion ◽  
Industrial Applications ◽  
Performance Comparison ◽  
Active Filter ◽  
Active Filters ◽  
Hybrid Filter ◽  
Q Theory ◽  
Source Current

Harmonic Distortion in many of the industrial applications are occur primarily owing to the enormous utilization of loads with high non-linearity like power converters, speed varying drives and arc furnaces. The power semiconductor is used to achieve the variation in speed and conversion from one source to another. Mostly active filters and tuned filters are utilized to remove the harmonic included in the source current. The tuned passive filters and inductance inserted in the line reduces the harmonics but at the same time induces the resonances in most of the industrial applications. Due to this, harmonic distortion increases in the source current and voltage. This can be reduced by adding hybrid filter in the system with decreased rating of active filter in high power applications. This article deals with the various topology of hybrid filters. The working of the proposed filter design in variable inductance mode based on the pollution created in the source voltage and current is studied. In the proposed hybrid filter passive filter is tuned with seventh harmonic frequency and connected in series with active filters to reduce the harmonic distortion. DC link voltage and the active filter VA rating could be minimized. The control signal to the filter is derived from p-q theory and space vector pulse width modulation (SVPWM). The performance of the system under study is simulated and noted for the THD percentage before and after the filter is added to the system and the same model is experimented with reduced voltage level.

scholarly journals SINGLE-PHASE HYBRID FILTER FOR DECENTRALIZED POWER SYSTEMS

2021 ◽  
Vol 2021 (59) ◽  
pp. 99-103
Author(s):  
V.M. Hubarevych ◽  
◽  
Yu.V. Marunia ◽  
Keyword(s):  
Power Systems ◽  
Power Supply ◽  
Single Phase ◽  
Active Filter ◽  
Hybrid Filter ◽  
Current Harmonics ◽  
Current Consumption ◽  
Maximum Current ◽  
Power Part ◽  
Bridge Rectifier

The analysis of the single-phase hybrid filter of network current harmonics, which can be applied in the decentralized power system, was carried out. Mathematical modeling of such a system that feeds a bridge rectifier with a capacitive filter and the 10 kW active load was performed. A comparison of current spectrograms and current diagrams of different configurations of a hybrid filter implemented in the active part on the basis of an active corrector of the parallel type, and in the passive part - a broadband LMC filter with an additional winding Ld was carried out. The maximum current deviations from the shape of the first harmonic of the current consumption for different structures of the passive filter were determined, which is decisive for the calculation of the power part of the active filter. The installed power of the active filter was calculated, the harmonic coefficients of the current consumption of the power supply network were obtained. Ref. 11, fig. 5, table.

Investigations into the Clinical Utility of Latex D-Dimer in the Diagnosis of Deep Venous Thrombosis

1993 ◽  
Vol 69 (01) ◽  
pp. 008-011 ◽  
Author(s):  
Cedric J Carter ◽  
D Lynn Doyle ◽  
Nigel Dawson ◽  
Shauna Fowler ◽  
Dana V Devine
Keyword(s):  
Venous Thrombosis ◽  
Deep Venous Thrombosis ◽  
Lower Limb ◽  
Clinical Utility ◽  
Rapid Test ◽  
Fibrin Degradation Product ◽  
Current Form ◽  
Non Invasive ◽  
Clinically Significant ◽  
D Dimer

SummaryThe serial use of non-invasive tests has been shown to be a safe method of managing outpatients who are suspected of having lower limb deep venous thrombosis (DVT). Objective testing has shown that the majority of these outpatients do not have venous thrombosis. A rapid test to exclude DVT in these patients, without the need for expensive and inconvenient serial non-invasive vascular testing, would have practical and economic advantages.Studies measuring the fibrin degradation product D-dimer using enzyme-linked immunoassays (EIA) in patients with veno-graphically proven DVT suggest that it should be possible to exclude this condition by the use of one of the rapid latex bead D-dimer tests.We have examined 190 patients with suspected DVT using both a latex and an EIA D-dimer assay. The latex D-dimer test used in this study was negative in 7 of the 36 proven cases of DVT. This sensitivity of only 80% is not sufficient to allow this type of assay, in its current form, to be used as an exclusion test for DVT. The same plasma samples were tested with an EIA assay. This information was used to mathematically model the effects of selecting a range of D-dimer discriminant cut off points for the diagnosis of DVT. These results indicate that 62% of suspected clinically significant DVT could have this diagnosis excluded, with a 98% sensitivity, if the rapid latex or equivalent D-dimer test could be reformulated to measure less than 185 ng/ml of D-dimer.

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