Characteristics of Wind Flow Variation with Wing Development of Space-Reduced Damper

The paper gives the description of the original wind electrical installation with mechanical reduction in which the output of vertical axis wind turbine with rather low rotation speed over multiplicator is distributed to a certain number of generators. The number of acting generators is determined by the output of actual operating wind stream at each moment. According to this constructive scheme, it is possible to provide effective and with maximum efficiency installation work in a wide range of wind speeds and under any schedule issued to the consumer of electricity. As there are no any experience in using such complexes, mathematical description of its main elements is given, namely windwheels, generators with electromagnetic excitation of magnetic electrical type, then their interaction with windwheel, and also the results of mathematical modeling of work system regimes under using the offered system of equations. The basis for the mathematical description of the main elements of the installation – synchronous generators – are the system of equations of electrical and mechanical equilibrium in relative units in rotating coordinates without considering saturation of the magnetic circuit. The equation of mechanical equilibrium systems includes torque and brake windwheel electromagnetic moments of generators with taking into account the reduction coefficients and friction. In addition, we specify the alternator rotor dynamics resulting from continuous torque of windwheel fluctuations under the influence of unsteady wind flow and wind speed serving as the original variable is modeled by a set of sinusoids. Model simplification is achieved by equivalization of similar generators and by disregarding these transitions with a small time constant. Calculation the installation with synchronous generators of two types of small and medium capacity taking into account the operational factors allowed us to demonstrate the logic of interactions in the main elements of the reported complex in the process of converting wind flow into the generated active and reactive power. We have shown the possibility of stable system work under changeable wind stream condition by regulating of the plant blade angle and with simultaneous varying of generator number of different types. All these are in great interest for project organizations and power producers.

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Increase Power Efficientand Reliability of Electrosupply of Consumers of Low Power

GIS Business ◽

10.26643/gis.v14i4.4833 ◽

2019 ◽

Vol 14 (4) ◽

pp. 42-52

Author(s):

Sadullayev Nasillo Nematovich ◽

Safarov Alisher Bekmurodovich ◽

Nematov Shuhrat Nasilloyevich ◽

Mamedov Rasul Akif- Ogli

Keyword(s):

Wind Speed ◽

Probability Distribution ◽

Low Power ◽

Electric Power ◽

Energy Sources ◽

Wind Flow ◽

Wind Rose ◽

Energy Potential ◽

Wind Power Installation ◽

Wind Energy Potential

This article assesses the wind speed data and wind energy potential in the Bukhara region of Uzbekistan. In article it is stated a principle construction "hybrid" a source of the electric power consisting from wind power installation with mechanical store of energy, the solar panel with аккумулятор in common working with an electric network. The speed and direction of the wind measured at a height of 10 m were analyzed by the Weibull probability distribution functionTo determine the direction of wind flow (wind rose), a graph in Matlab environment was constructed. The method of an estimation energy of efficiency of the objects eating from several energy sources is offered. It is proved efficiency of application of such source of the electric power low power consumers

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OPTIMIZATION OF WASTEWATER TREATMENT PLANTS MONITORING IN FLOW VARIATION CONDITIONS DUE TO RAIN EVENTS

Environmental Engineering and Management Journal ◽

10.30638/eemj.2016.213 ◽

2016 ◽

Vol 15 (9) ◽

pp. 1981-1988 ◽

Cited By ~ 1

Author(s):

Carmine Fiorentino ◽

Maurizio Luca Mancini ◽

Luca Luccarini

Keyword(s):

Wastewater Treatment ◽

Wastewater Treatment Plants ◽

Flow Variation ◽

Rain Events

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Systematic position of Omostropus rotundatus and notes on some other species of Harpalina (Coleoptera: Carabidae) from Ethiopia

Zoosystematica Rossica ◽

10.31610/zsr/2020.29.2.195 ◽

2020 ◽

Vol 29 (2) ◽

pp. 195-204

Author(s):

B.M. Kataev ◽

M.A. Yeshitla ◽

J. Schmidt

Keyword(s):

Hind Wing ◽

Systematic Position ◽

Wing Development ◽

Diagnostic Characters

Omostropus rotundatus Clarke, 1973 from the Bale Mountains (Ethiopia) is transferred to the genus Harpalus Latreille, 1802. Since the name rotundatus was already used in the latter genus, the substitute name Harpalus clarkei Kataev et Schmidt, nom. nov. is proposed for Harpalus rotundatus (Clarke, 1973), comb. nov. (non Dejean, 1829; non Chaudoir, 1844). The diagnostic characters of Harpalus and Omostropus are discussed. Data on distribution and hind wing development of some additional Ethiopian species of Harpalina mostly from the Bale and Arsi Mountains are presented.

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