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METHODICAL APPROACHES TO THE CHOICE OF THE NEW GENERATION OF HIGH-VOLTAGE POWER TRANSMISSION LINE 220 kV OPTIONS
Authors: V.M. POSTOLATI, E.V. BYKOVA, V. M. SUSLOVInstitute of Power Engineering of the Academy of Sciences of MoldovaUI.G. SHAKARYAN, L.V. TIMASHOVA, S.N. KAREVAScientific-Technical Center of Power Engineering, Moscow, Russia
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Abstract: The Transmission Power Lines of new generation are described in the article (single- compact, double-circuit compact, double-circuit Controlled Self-compensating High Voltage Transmission Power Lines (CSHVL). Basic principles of creation, design elements and comparative characteristics of the transmission lines of the new generation are described, the advantages of its are showed. Methodical approaches to the choosing of a new generation of transmission lines and facilities management FACTS are formulated. Methodical approaches to the choice of options for transmission lines 220 kV and facilities management are shown. |
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Keywords: the Transmission Power Lines of new generation, controlled, single- compact, double-circuit compact, double-circuit Controlled Self-compensating High Voltage Transmission Power Lines, the apparatus of regulation of the type FACTS.
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REACTIVE POWER COMPENSATION OF THE TRACTION NETWORK OF THE ELECTRIFIED RAILWAY TRANSPORTATION
Authors: Berzan V.P., Patsyuk V.I., Rimschi V.X., Tirsu M.S., Andros I.V. (Institute of Power Engineering of the Academy of Sciences of Moldova.), Sheliagin V.D., Nikulin A.T., Bernackiy A.V. (Electrical Welding Institute “E.O.Paton” of the National Academy of Sciences of Ukraine)
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Abstract: The method of the parametrical analysis of reactive power compensation of traction network depending on load-ing position on stage between two traction substations is offered. Problem solutions are received in an explicit form at a unilateral and bilateral supplying of complex loading by traction network. The parametrical analysis of active loading influence on characteristics of the compensating devices mounted on low voltage bars of traction substations depending on a site of this loading between power supplies and the loading is made. It is shown, that depending on point of joining of active loading to network and its values the compensating device generally should generate both inductive, and capacitive reactive power for maintenance of power factor value of traction network . |
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Keywords: reactive power, compensation, electrified, railway.
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REFINED ALGORITHMS OF ELECTRICAL ENERGY LOSSES CALCULATION IN 0,38 KV NETWORKS IN REAL TIME
Authors: Miroshnyk A. Kharkov National Technical University of Agriculture Petr Vasylenko (KNTUA)
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Abstract: An approach for closer definition of electrical energy losses size in air lines due to the accounting of environment temperature influence and flowing current size on the wire resistance is offered. Multifunctional microprocessor devices for energy losses calculation are elaborated. |
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Keywords: electrical energy losses, environment temperature, multifunctional microprocessor devices.
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PRINCIPLES OF THE DETERMINATION ENERGY INTENSITY OF THE AGRICULTURAL PRODUCTS
Authors: F. Erhan, V. Rotari (Agrarian University of Moldova),Anastasia Mocanu (State University of Cahul)
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Abstract: A set of energy resources is consumed in the primary production and conversion process of agricultural product. Minimal quantity of energy required for the production of agricultural product unit is considered by the notion of energy intensity of agricultural products. |
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Keywords: energy intensity, agricultural product, minimum necessary energy, volume of energy.
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INDUSTRIAL CARBON DIOXIDE HEAT PUMP STATION WITH EVAPORATORS WORKING AT VARIOUS TEMPERATURE LEVELS AND AT VARIABLE LOAD
Authors: Sit M.L., Balanuta A.P., Sit B.M.,
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Abstract: The block diagram of an industrial carbon dioxide heat pump working in a supercritical cycle, with two evaporators included in parallel working at different temperature levels (mainly for wine-making factories) is developed. Heat pump is intended for simultaneous production of heat and cold and works at variable thermal loading. It is shown, how an ejector inclusion in the heat pump scheme provides growth of its thermal efficiency. The way of construction of the hydraulic scheme and a control system provides full controllability of the thermal pump. |
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Keywords: heat pump, carbon dioxide, control system, evaporator, controllable ejector.
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ANALYSIS OF SOME ASSUMPTIONS OF NAVIER-STOKES EQUATION
Authors: V.Budarin.,Odesa National Politecnical University
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Abstract: Several stages of the derivation of Navier-Stokes equations in coordinate form are analyzed. The purpose of the analysis is the determination of long-term problems of system closure, of reasons for differences of exact solutions for low Reynolds numbers and the appearance of unstable solutions using computer programs. |
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Keywords: Navier-Stokes equation, approached equation, equation closure, status correction.
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Set of equipment for the production solid biofuel (pellets made of sunflower)
Authors: Slusarenko V., JSC "Alimentarmash", Chişinău
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Abstract: A problem which appears during the process of sunflower oil production by hot-pressing, namely the problem of wastes - husks of sunflower seeds is described in this article. The examples of its use as a solid biofuel are shown. The advantages of sunflower pellets compared to the traditional types of solid fuel are discussed. Hardware and technological scheme of the equipment for the production of fuel pellets made of sunflower is shown. The characteristics of pellets produced from the set of the husk are shown as well. |
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Keywords: sunflower husks, wood pellets, pellets, extrusion, equipment set, granulation, solid biofuel.
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SOLID BIOFUEL UTILIZATION IN VEGETABLE OIL PRODUCTION
Authors: V. Slusarenko, JSC "Alimentarmash”, Khisinau
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Abstract: The paper deals with questions of creating at JSC “Alimentarmash "in the last 20 years the technological equipment for the production of vegetable oils from oilseeds: from the press for the final spin to mini oilfactory, using as an energy source for heating the liquid coolant (Thermal oil "Arian") of solid biofuels - husk of sunflower seeds. |
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Keywords: press, pressing, oil, husk of sunflower seeds, minioilfactory, thermal oil, coolant, biofuel,roaster.
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PROPERTIES AND PECULIARITIES OF SPACE-VECTOR-BASED SYNCHRONIZED MODULATION FOR POWER ELECTRONIC CONVERTERS
Authors: V. Oleschuk
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Abstract: This paper presents brief description of peculiarities of a novel method of synchronized pulsewidth modulation (PWM) for power electronic converters. Comprehensive comparison with standard PWM techniques has been done. Basic aspects of practical relevance of new PWM method have been described. |
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Keywords: modulation strategy, voltage source inverter, electric drive.
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MARKAL Application for Analysis of Energy Efficiency in Economic Activities of the Republic of Moldova and Feasible use of Renewable Energy Sources
Authors: Robu S., Bikova E., Institute of Power Engineering of Academy of Sciences of Moldova, Siakkis P, CRES - Centre for Renewable Energy Sources, Greece, Giannakidis G., CRES - Centre for Renewable Energy Sources, Greece
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Abstract: The paper presents results of analyses of energy efficiency measures and renewable energy sources implementation in the Republic of Moldova using MARKAL model. Detailed analyses of four scenarios are presented for: Reference Scenario; Energy Efficiency Scenario; Renewable Energy Sources Scenario; Energy Efficiency&Renewable Energy Scenario. Energy savings and costs are identified for implementation of renewable energy sources and Energy efficiency measures. |
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Keywords: energy efficiency, renewable energy sources, scenarios assessment.
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ENERGETIC IS A WORLD PROBLEM OR NOT?
Authors: Tirshu M.
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Abstract: |
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Keywords: energy
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| 12 |
ENERGETICA ESTE SAU NU O PROBLEMĂ MONDIALĂ?
Authors:
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Abstract: |
