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6 results on '"Vinnikov D"'

1. ОБ ЭКСПЕРИМЕНТАЛЬНЫХ ИСПЫТАНИЯХ ДВУХТАКТНОГО КВАЗИ-ИПЕДАНСНОГО ПРЕОБРАЗОВАТЕЛЯ ПОСТОЯННОГО НАПРЯЖЕНИЯ С ПОЛУПРОВОДНИКОВЫМИ ЭЛЕМЕНТАМИ НА ОСНОВЕ КАРБИДА КРЕМНИЯ

Author

Blinov, A., Chub, A., Vinnikov, D., and Husev, O.

Subjects
широкозонные полупроводники, повышающий преобразователь, ветровые турбины, wide bandgap semiconductors, step-up converter, wind turbine
Abstract

This paper presents a quasi-Z-source DC/DC converter with wide input voltage regulation range. The proposed converter is intended to operate as power conditioning system for alternative and renewable energy sources, such as PMSG-based wind turbine systems. Due to a number of specific properties, the converter was used to test and show advantages of a new generation of SiC-based semiconductors. The experiments showed considerable reduction of losses in comparison to Si devices, as it was in expected from the analytical analysis. According to measurements by implementation of SiC-devices the losses in transistors were reduced by 66% and switching losses in diodes by 92 %., В статье рассмотрен квази-импедансный преобразователь постоянного напряжения с широким диапазоном регулирования. Благодаря этой особенности его предложено использовать для интеграции с сетью ветровых турбин на базе синхронных генераторов с постоянными магнитами. Вследствие ряда особенностей, данный преобразователь стал платформой для испытаний и демонстрации преимуществ SiC- полупроводников нового поколения. Эксперименты показали значительное уменьшение потерь мощности в этих элементах, по сравнению с кремниевыми аналогами, что предсказывали предварительные расчеты КПД. Согласно испытаниям, благодаря применению SiC-приборов потери в силовых ключах были уменьшены на 66%, а динамические потери диодов на 92 %.

Published
2013

2. СРАВНИТЕЛЬНЫЙ АНАЛИЗ ПОВЫШАЮЩИХ ПРЕОБРАЗОВАТЕЛЕЙ ДЛЯ ИНТЕГРАЦИИ ФОТОЭЛЕКТРИЧЕСКИХ ПАНЕЛЕЙ В СЕТЬ

Author

Husev, O., Vinnikov, D., and Veligorskiy, O.

Subjects
DC/DC преобразователь, фотоэлектрическая панель, сеть, DC / DC converter, the PV panel, grid
Abstract

The existing schematics solutions of the boost converters for grid connected photovoltaic panels are considered. A comparison of the boost converter with an inverter at the output stage and three level quasi-Z-source inverter was performed. Input voltage range, the quality of the output voltage, power density were analyzed during comparison., Рассмотрены существующие схемные решения повышающих преобразователей для интеграции фотоэлектрических панелей в сеть. Произведено сравнение повышающего преобразователя с инвертором на выходе с трехуровневым квази-импедансным инвертором за такими показателями как диапазон входных напряжений, качество выходного напряжения, массогабаритные показатели.

Published
2013

3. EXPERIMENTAL INVESTIGATION OF ELECTRICAL DISCHARGE IN LIQUID INITIATED BETWEEN CONE CHANNEL ELECTRODES

Author

Ozerov, A. N., Vinnikov, D. V., Yuferov, V. B., Sakun, O. V., Korytchenko, K. V., and Mesenko, O. P.

Subjects
621.746.044.4.001.57, electrical discharge in liquid, cone channel electrodes, cavity initiation, shock waves focusing, directed cavity motion
Abstract

В работе рассмотрен электрический разряд в жидкости между электродами с конусной выемкой применительно к задаче создания кавитационной полости с фокусировкой ударных волн. Исследована скорость направленного движения кавитационной полости, кривые изменения прозрачности жидкости на длине волны 650 нм, влияние пониженного давления на акустические сигналы при фокусировке ударных волн., This paper delves into electrical discharge in liquid between cone channel electrodes as applied to a problem of cavity initiation with shock waves focusing. The velocity of the cavitation pocket directed motion has been determined. Curves of the liquid transparency variation at 650 nm wave length have been obtained. Low pressure influence on acoustic signals under shock waves focusing has been evaluated., У роботі розглянуто електричний вибух у рідині, між електродами з конусним вижолобком стосовно до задачі створення кавітаційної порожнини з фокусуванням ударних хвиль. Досліджена швидкість спрямованого руху кавітаційної порожнини, одержані криві зміни прозорості рідини на довжині хвилі 650 нм, встановлений вплив зниженого тиску на акустичні сигнали при фокусуванні ударних хвиль.

Published
2013

4. COMPARISON OF THE IMPEDANCE- SOURCE NETWORKS FOR VOLTAGE-FED COVERTERS.

Author

Husev, O., Chub, A., and Vinnikov, D.

Abstract

Impedance networks cover the entire realm of electric power conversion in a wide range of applications. Many converter topologies are presented in the literature in order to overcome the limitations of the traditional voltage source, current source, classical buck-boost, unidirectional and bidirectional converter topologies. This paper presents review of the main exist impedance-source networks for voltage-fed converter applications. The detailed analysis of their pros and cons is revealed. Boost factor of the different impedance networks is compared. The impedance networks that are based on the coupled inductors can have higher boost performance due to the adjustable turn's ratio of the windings. The comparison in terms of input current behavior is presented as well. Modification examples of the impedancesourced converters are separately considered. Design principles of the isolated and cascaded converters based on the impedance-source networks are shown. The field of application is discussed. Doe to the wide voltage regulation range along with cross conduction immunity discussed solutions are promising for the renewable energy applications. [ABSTRACT FROM AUTHOR]

Published
2015

5. [Smoking accelerates impairment of pulmonary function at high altitudes].

Author

Vinnikov DV

Subjects
Adult, Female, Forced Expiratory Volume, Humans, Hypoxia etiology, Longitudinal Studies, Male, Middle Aged, Respiratory Function Tests, Respiratory Physiological Phenomena drug effects, Smoking physiopathology, Altitude, Lung Diseases etiology, Lung Diseases physiopathology, Smoking adverse effects
Abstract

This work aimed at studying annual impairment of pulmonary function in smokers and in subjects leaving off smoking under conditions of intermittent hypoxia at high altitudes. The prospective 4-year study included 449 smokers aged 38.1 +/- 8.0 yr (97.8% men) and 234 non-smokers aged 38.5 +/- 9.3 yr (65.8% men) employed by a gold-mining company. Subjects of group 1 underwent a decrease of lung vital capacity (LVC) and forced LVC at a rate of 49.5 and 70.7 ml/yr respectively. The forced expiratory volume in the first second decreased by 80 ml/yr. Smokers who left off smoking showed an increase of LVC by 79.8 ml compared with its decrease by 31.6 ml in those who continued to smoke (p < 0.01). It is concluded that smoking under conditions of intermittent hypoxia leads to progressive impairment of pulmonary function; the impairment slows down after leaving off smoking that should be encouraged in every possible way.

Published
2012

6. [Complex assessment of nicotine dependence using questionnaires and measurement of carbon oxide concentration in exhaled air].

Author

Brimkulov NN, Vinnikov DV, and Cholurova RA

Subjects
Adult, Biomarkers analysis, Breath Tests, Female, Humans, Male, Middle Aged, Respiratory Mechanics physiology, Smoking Cessation, Tobacco Use Disorder physiopathology, Carbon Monoxide analysis, Surveys and Questionnaires, Tobacco Use Disorder diagnosis
Abstract

Aim: To study nicotine dependence (ND) basing on special questionnaires and measurement of CO concentrations in the exhaled air., Material and Methods: 350 smokers (318 males and 32 females) aged 20-57 years (mean age 37.1 +/- 7.3 years) were studied. ND was assessed by Fagerstrom test (FT), motivation to smoke and to quit tests, smoking history and exhaled CO measurement. In addition, respiratory complaints and ventilation parameters such as peak expiratory flow (PEF) and forced expiratory volume per 1 sec (FEV1) were measured., Results: Mean daily cigarette number was 14.2 +/- 7.3; smoking duration 16.3 +/- 7.8 years and smokers index 170.9 +/- 87.8. Smoking women differed from smoking men in ND, PEF% and FEV1% decline as well as CO level. Exhaled CO was 21.1 +/- 9.5 ppm, on the average, corresponding to moderate dependence. ND and daily cigarette number produced a direct impact on the exhaled CO level. FT findings directly correlated with the number of daily cigarettes and CO level (mean 3.2 +/- 2.3). Among motivation to smoke factors was the demand to release tension., Conclusion: ND varies considerably among smokers by severity. Smoking men and women differ considerably by ND. Along with dependence tests, exhaled CO measurement provides objective verification of ND.

Published
2004

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