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BASIC PRINCIPLES OF ORGANIZING OF REPAIR OF A NEW GENERATION OF ELECTRIC POWER LINES 220 kV AND ABOVE
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. KAREVA,Scientific-Technical Center of Power Engineering , Moscow, Russia
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Abstract: The article describes the requirements for repair work on single circuit and double circuit overhead transmission lines of compact (VL) and controlled self-compensating high voltage transmission power lines (CSHVL).These include overhead power lines to a new generation. They differ from traditional overhead using compact designs of supports, the convergence phase of the spans, circuits and substations connections to ways of regulation. With this new generation have the overhead compared to conventional overhead increased bandwidth and improved technical and economic indicators. The design and features of the new circuit overhead lines require a series of new campaigns for the organization of repairs, which are discussed in this article. |
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Keywords: transmission power lines of new generation, compact, controlled self-compensating high voltage transmission power lines.
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USE OF SIMULINK(MATLAB) FOR ANALYSIS OF ENERGY PERFORMANCE OF CLASSICAL PHASE SHIFT INSTALLATION
Authors: L.Calinin, D. Zaiţev, M.TirsuInstitute of Power Engineering of Academy of Sciences of Moldova, Kishinau, Republic of Moldova
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Abstract: Article is devoted to the development of simulation model in Simulink environment of phase shift installation, executed on classical scheme “Marcerau Connection”, test of idle, short-circuit and loading modes on base of this simulation model and determine of energy characteristics of this installation. |
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Keywords: simulation, “Marcerau Connection”, PST.
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TRANSFORMER-BASED PHOTOVOLTAIC SYSTEM WITH CASCADED CONVERTERS WITH DISCONTINUOUS SYNCHRONIZED MODULATION
Authors: V. Oleschuk, A. SizovInstitute of Power Engineering of the Academy of Sciences of Moldova
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Abstract: The paper presents results of analysis of operation of photovoltaic system on the base of dual inverters with discontinuous synchronized pulsewidth modulation (PWM). Two basic schemes of discontinuous synchronized PWM, applied for control of dual-inverter system under different operation conditions, have been analyzed and compared. |
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Keywords: voltage source inverter, photovoltaic system, modulation strategy, voltage synchronization.
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MULTIMODE CASCADE INVERTER MODEL DESIGNED FOR REACTIVE POWER COMPENSATION AND DISTORTION POWER IN GRIDS WITH RECTIFIER LOAD NATURE
Authors: Loskutov А.B., Altunin B.Iu., Karnavsky I.А.Nizhniy Novgorod State Technical University R.E. Alexeev
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Abstract: This article presents trends of development and research in the region of increase of the electric energy quality and electromagnetic compatibility of middle big power load with rectifier type. It is developed the simulation model of compensator unit. There are presented results of simulation of the inactive power compensator which is based on the multimode cascade inverter. |
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Keywords: power coefficient corrector, STATCOM, multimode PWM, reactive power, distortion power, active filter.
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THE IDENTIFICATION OF SOLUTIONS TO COVER ENERGY DEMAND FROM RENEWABLES
Authors: Ion Comendant, icomendant@gmail.com, Institute of Power Engineering of ASM
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Abstract: Renewable energy sources development in the conditions of existing country legal framework may provoke a significant electricity tariff increasing, out of consumer’s capacity to pay for the power consumed. This aspect should be taken into consideration at the stage of aiming the goal of involving the renewable sources in the energy balance. Based on the elaborated models, for wind farms and the sources on biomass the maximum allowed level of electricity generated is determined to satisfy country annual load curve. |
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Keywords: renewable energy sources, wind farm, sources on biomass, limited load demand, capacity to pay.
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PREDICTIVE CONTROL SYSTEM SYNTHESIS OF DISTRICT HEATING SYSTEM
Authors: S.A. Dobrotin, E.L. ProkopchukDzerjinsk Politechnical Institute, (branch of the Nijnyi Novgorod Technical University, R.E. Alexeev)
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Abstract: A combined system of building heating predictive control has been synthesized in the research. Following algorithms are described: adaptive algorithm of very short-term temperature forecast and algorithm of anticipatory control of heat supply to building heating taking into account different outside climate influence on elevations of a building. |
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Keywords: predictive control, algorithm, forecasting, heating, synthesis, building, heat.
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MODELING OF THE HEAT PUMP STATION CONTROLABLE LOOP OF AN INTERMEDIATE HEAT-TRANSFER AGENT (Part II)
Authors: Sit M.L., Andronaty N.R., Sit B.M. Institute of Power Engineering of the ASM
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Abstract: It is studied the model of the heat pump station controllable loop of an intermediate heat-transfer agent for the use in wineries. There are demonstrated transients after the disturbing action of the temperature on the input of cooling jacket of the fermentation stirred tank. There are compared different control laws of the object. |
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Keywords: heat pump, modeling, control system.
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ANALYSIS OF THE SITUATION IN PHOTOVOLTAIC CELLS ON THE NATIONAL AND INTERNATIONAL MARKET
Authors: M.Tirsu, M.UzunInstitute of Power Engineering of the ASM, Kishinau, Republic of Moldova
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Abstract: The paper is aimed to analyses of existing photovoltaic cells, its parameters, considering lifetime, efficiency and price. It was established, that efficiency of PV cells is situated in range of 5-30 percents. The PV cells with high efficiency (more than 20%) have a cost in 5-10 times more than PV cells with efficiency up to 15%. On the market of Republic Moldova are commercialized PV cells with efficiency up to 15% only. The lifetime of PV cells are situated between 20 and 30 years and after 15 years of life service its efficiency decreasing on about 10%. Additional, efficiency of PV cells depends also from temperature of environment and decreasing on 0,3% on each degree. It technical parameters a given at temperature of 25oC of environment. At the same time, it can be underlined, that in near future the development of PV cells will be aimed to using of organic cells which now have efficiency about 5-7%. In order to develop a new generation of PV cells more usefully it can be considered design, where nanocristal silicon layer is infed between thin layers of amorphous silicon. It offer a very high efficiency of PV battery, and more, it is possible to exclude bulkiness intermediate layers from silicon monocrystal and as a result the material cost decreasing. |
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Keywords: PV cells, modules, conversion of solar energy into electric energy.
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