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POWER STRATEGY OF THE AGRICULTURE DEVELOPMENT IN THE CONDITIONS OF CRISIS
Authors: Burdo O.G., Buiwol S. M., Bandura V.N.
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Abstract: Questions of the development of energetics in the world are examined. Specifics of the energy supply in agriculture are discussed and the basics of energy policy and strategy in crisis conditions are formulated. The methodology of power monitoring and basics of economy of power management are shown. Priorities at forma-tion of stages of projects implementation are proved. Ways of energy efficiency programs creation using partial projects self–financing mechanisms are shown. |
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Keywords: Energy strategy, energy efficiency, energy monitoring
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| 2 |
THE ACTUALITY OF IMPROVING THE TARIFF POLICY IN ENERGETICS AND ADJAСENT SECTORS OF THE ECONOMY
Authors: Postolaty V. M.
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Abstract: Relationships between energy and branches of economy of the Republic of Moldova are considered. Inconsistency of tariff policy between energy companies – suppliers of energy and consumers – branches of economy and households are identified. The model and recommendations on coordination the tariff for energy resources, taking into account the interest of both consumers and energy companies, contributing to economical development, are proposed. |
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Keywords: tariff, level of income, energy resources, energy and fuel sector, energy supply companies and organizations, consumers of fuel and energy.
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| 3 |
IDLING AND NATURAL POWER TRANSFER LOSS SAVING BY MEANS OF SHUNT REACTORS AND REACTIVE POWER SOURCES
Authors: Patsiuk V.I.
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Abstract: The closed formulas for definition of the steady–state values of voltages, currents, active and reactive power in a line with the distributed and lumped constants are shown. The influence of the shunt reactors and reactive power sources in the form of capacitor banks on losses of idling with various wave lengths is investigated. For the half-wave transmissions line the optimal parameters (which allow increasing of the output during the natural-power transfer) of the shunt reactors were obtained. |
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Keywords: telegraph equations, half-wave and quarter-wave transmission line, active power losses, shunt reactors, reactive power sources.
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Investigation of power regimes of Southern Eectrical Networks of 110 kV in case of disconnecting of the high voltage electric transmission line of 400 kV of Moldavian condenced power plant ( MCPP ) – Vulcaneshty
Authors: Postolaty V. M. , Bicova E. V.
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Abstract: Investigation of power regimes of Southern Eectrical Networks of 110 kV in case of disconnecting of the high voltage electric transmission line of 400 kV of Moldavian condenced power plant ( MCPP ) – Vulcaneshty |
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Keywords: energy system, autotransformer, energy generation sources, voltage level.
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TWO–PHASE ASYNCHRONOUS GENERATOR WITH CONDENSER EXCITATION
Authors: Berzan V., Tirsu М., Birladean А.
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Abstract: In article two-winding asynchronous generator in biphasic execution with the capacitor excitation, executed on the basis of the asynchronous engine with a short-circuited rotor is considered. Researches of the developed generator are executed under various schemes of connection of stator windings. Selecting phases wire numbers of stator windings implemented for various voltages with inclusion on a phase of the raised voltage of excitation condensers, allowed decreasing the size of capacity and improving indicators and generator characteristics. |
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Keywords: asynchronous generator, condenser, phase, winding, scheme, voltage, capacity
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SYNCHRONOUS BALANCED OPERATION OF OPEN-END WINDING MOTOR DRIVE WITH TWO ISOLATED DC-SOURCES
Authors: V. Oleschuk, G. Griva, R. Prudeak, A. Sizov
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Abstract: Novel method of synchronized pulsewidth modulation (PWM) has been applied for balanced control of dual inverter-fed drive with an open-end-winding induction motor, supplied by two isolated dc-sources. Simulations give the behavior of dual inverter-fed systems with continuous and discontinuous versions of synchronized PWM. |
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Keywords: cascaded voltage source inverters, open-end winding induction motor, synchronized pulse-width modulation, dc-voltage sources, power balancing.
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REGIMES ANALYSIS OF THE VOLTAGE PULSE REGULATORS ON THE BASIC OF THE INVARIANCE PROPERTY OF THE CONTROL CHARACTERISTICS
Authors: A.A.Penin
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Abstract: Regime characteristic values are determined relative to character values of regulation curve of switching regulator. Regime changing and the correspondence between various regime parameters are examined as a geometric (projective) transformation. This makes possible to validate the regime definition, to restrict the range of their variation on the rising area of the control characteristic, to realize the linearization of this characteristic, to compare different pulse regulators. |
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Keywords: solar energy, switching boost and buck-boost regulators and voltage converters, control characteristics, regime determination and comparison, projective transformations, hyperbolic metric.
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| 8 |
THE RESEARCH OF THERMOSYPHONS FUNCTIONING AT PROCESSING OF DISPERSED AND VISCOUS FOOD MEDIUMS
Authors: Bezbah I. V, Omer Seed Ahmed, Donkoglov V. I.
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Abstract: Devices based on thermosyphons for drying, heat treatment of disperse food materials, non-Newtonian food liquids are considered. The results of experimental researches are shown. |
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Keywords: thermosyphons, disperse materials, non-Newton liquids.
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| 9 |
AUTOMATIC CONTROL SYSTEM OF THE DIFFERENCE BETWEEN DISCHARGE AND SUCTION PRESSURES OF THE HEAT PUMP STATION COMPRESSOR
Authors: Sit M.L., Juravleov A.A., Sit B.M.
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Abstract: Possibility of realization is shown and the control system of a difference of pressure between an exit and an input of the compressor of the heat pump on carbon dioxide working at variable thermal load, and discharge and suction pressures by means of two control valves connected in series is developed. On an example a flow coefficient calculation procedure of control valves is shown. |
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Keywords: heat pump, carbon dioxide, control system, pressure difference, compressor.
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| 10 |
Anatol JURAVLIOV – 60 ani
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Anatoly JURAVLIOV – 60 Years old!
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| 12 |
Obituary, L.G. Medvedev
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