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ELECTROENERGETICS
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NON-STANDARD CONTROL MODES OF ASYMMETRICAL SIX-PHASE POWER CONVERSION SYSTEMS WITH SYNCHRONIZED PWM
Authors: V. Oleschuk, R. Prudyak, A. Sizov Institute of Power Engineering of the Academy of Sciences of Moldova
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Abstract: Novel method of synchronized space-vector pulsewidth modulation (PWM) has been developed and disseminated for control of asymmetrical six-phase systems. It has been shown, that application of the proposed method provides continuous synchronization of the output voltage of six-phase converters during the whole control range for both standard and non-standard control modes of power conversion systems. |
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Keywords: six-phase motor drive, space-vector modulation, synchronization of the phase output voltage waveforms.
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CARACTERISTICS OF FAULTS IN ELECTRIC DISTRIBUTION FACILITIES
Authors: V.Popescu.Agrarian University of Moldova
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Abstract: There is a significant number of faults in the electric power distribution facilities, conditioned by various random factors. The level of reliability of electric supply is determined by the graph of electrical networks and the state of there components. To increase the reliability of distribution networks is absolutely necessary to know the factors that cause the faults of the installed equipment and their characteristics. It is presented method for analisys of reliability of distribution and transmission facilities. |
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Keywords: reliability of electrical networks; reliability indicators; the influence of outward and inward factors; caracteristics of faults in distribution facilities.
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THE IMPACT OF TRANSMISSIONS 110 kV ON THE LEVEL OF POWER LOSSES IN MOLDAVIAN POWER SYSTEM
Authors: L.Calinin, D. Zaitsev, M.Tirshu, I.GolubInstitute of Power Engineering of Academy of Sciences of Moldova
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Abstract: The paper present the simulation results of system operation in conditions of energy exchange with Ukraine considering the level of power losses in Moldova. |
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Keywords: interconnections, flow distribution, power losses, compensating devices.
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INVESTIGATION OF SYSTEM EFFICIENCY OF EXPANSION OF EXISTING COGENERATING POWER PLANTS IN THE POWER SYSTEM OF MOLDOVA
Authors: Vitaly Postolaty, Elena BicovaInstitute of Power Engineering of the ASM
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Abstract: The paper considers the energy modes of Moldova at the introduction of new facilities at the existing heating plants. Its influence on the change in the intra-and inter-system power flows and the amount of power losses in power systems of Moldova and Ukraine in parallel operation is studied as well. |
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Keywords: power systems, cogenerating power plant, flow and losses of power.
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THERMOENERGETICS
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METAL-POLYMER SOLAR COLLECTORS WITH MULTICHANNEL ABSORBER FOR MULTIFUNCTIONAL MULTIPURPOSE ENERGY SYSTEMS
Authors: A. Doroshenko1, V. Danko2, Y. Turbovets 1. 1 Odessa National Academy of Food TechnologiesEducational and Scientific Institute of refrigeration, criotechnology and ecoenergetics2) Donetsk National University of Economy and Trade named after Mykhaylo Tugan-Baranovsky
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Abstract: New modification of liquid-metal-polymer solar collector for solar heating and for creation of multifunctional energy systems on its basis, particularly solar refrigeration systems was developed. A comparative study of several modifications of polymer collectors involving data of a set of foreign researchers was made and high efficiency of the new elaboration was proven. |
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Keywords: solar collectors, polymer materials, efficiency.
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CARBON DIOXIDE HEAT PUMP IN TRANSCRITICAL CYCLE FOR INSTALLATION FOR PASTEURIZATION AND COOLING OF DAIRY FOODS
Authors: Sit M.L., Ioisher A.M., Sit B.M.Institute of Power Engineering of the Academy of Sciences of Moldova
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Abstract: There are elaborated schemes of installations for pasteurization and cooling of dairy foods with heat pumps introduced in there schemes. Schemes distinguish oneself by the possibility of using of additional useful heat for getting hot water for technological purposes. |
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Keywords: heat pump, installation for pasteurization and cooling, dairy foods, thermodynamic cycle, carbon dioxide.
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ENERGY EFFICENCY INCREASE OF PROCESSES ON GAS – REGULATING STATIONS
Authors: M.A. Zhidkov, Scientific and Technical center “Vortex technologies”, Moscow, D.A. Zhidkov, Bauman Moscow State Technical University
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Abstract: There are presented results of the thermodynamic analysis of vortex tubes in recuperative technological schemes and examples of practical implementation of findings in the chemical, oil and gas industry, in particular for the vortex heating of the natural gas on the gas - regulating station. |
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Keywords: triple-flow vortex tube, installation with vortex tube, gas - regulating station, regenerative heat exchanger, exergy analysis.
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BENCHMARKING METHODOLOGY FOR INCREASING OF ENERGY EFFICIENCY OF INDUSTRY OF UKRAINE
Authors: V.P. ROSEN, B.L. TYSHEVYCH, E.N. INSHEKOV, P.V ROSENNational technical university of UKRAINE “Kyiv polytechnic institute” NTUU “KPI”
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Abstract: It is considered the organization benchmarking using energy efficiency for industrial and utility enterprises in Ukraine. It focuses on an integrated approach, which is to create a legislative base and organization of informational support during benchmarking. Details the experience of EU countries in decision similar prob-lems. |
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Keywords: energy efficiency, benchmarking of energy efficiency.
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ACADEMICIAN V.M. POSTOLATY - 75 years
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