SUMMARY
GEORGIAN NATIONAL ENERGY REGULATORY COMMISSION. STRATEGY AND TASKS
Eristavi E.L., Chomakhidze D.I. and Tsintsadze P.P.
Georgian National Energy Regulatory Commission
The essence of the energy state regulation, its strategy and tasks are considered . The necessity in the energy regulation for successful development of the power industry is substantiated with consideration of the foreign experience. Some results of the activities of the energy-regulating body in Georgia are presented. The problems of establishing and regulating the tariffs on electric power and natural gas and the related methodological and organizational items are also considered.
Keywords: electric power, natural gas, regulation, tariffs.
ON THE CONDITIONS STIPULATED IN THE AGREEMENT CONCLUDED BETWEEN AES SILK ROAD HOLDING BV AND THE STATE OF GEORGIA IN DECEMBER OF 1998
Arveladze R.D.
Georgian Technical University
Georgian National Energetic Academy
Some conditions stipulated in the Agreement concluded between AES Silk Road Holding BV and the State of Georgia in December of 1998 are considered. In the author's opinion these conditions place the parties under unequal conditions and/or contradict the Georgian legislation.
Keywords: power industry, privatization, agreement.
MAIN PROBLEMS AND DEVELOPMENT OUTLOOK FOR GEORGIAN ENERGY
Arabidze G.O. and Vezirishvili O.Sh.
Georgian Technical University
General trends in the development of Georgian energy are considered. The efficiency and prospects of Georgian energy are estimated. The ways of overcoming the present energetic crisis in the near future are outlined. Complex solutions to the problems associated with new energy-saving systems are considered.
Keywords: energy system, development, prospects, energy saving.
TAKING ACCOUNT OF ECOLOGICAL FACTORS WHEN DETERMINING THE EFFICIENCY OF UTILIZATION OF HEAT POWER PLANTS
Arabidze G.O. and Vezirishvili O.Sh.
Georgian Technical University
New methods for estimation of the ecological damage caused by heat power plants have been developed. The computer program algorithm and the algorithm block diagram were developed. By the mentioned algorithm, the alignment chart (nomograph), which allows to determine rapidly the specific ecological damage, was drawn up. The developed methods were applied for estimating the ecological damage for particular heat power plants. The results were used in the technical and economic analysis for outlining the development of clean power nowadays and in prospect.
Keywords: heat power plant, ecological damage, utilization efficiency.
SEPARATED HYBRID GRID OF DIRECT AND ALTERNATING VOLTAGE WITH RENEWABLE SOURCES OF ENERGY
Kokhreidze G.K. and Laoshvili D.P.
Georgian Technical University
Georgian Scientific and Engineering Center of Electric Power
A circuit design of the separated combined (hybrid) grid of alternating and direct voltage with unconventional (renewable) sources of energy is presented. In the presented circuit design simultaneous employment of diesel generators, solar batteries, wind turbines and storage batteries is envisaged. Such a grid can provide uninterruptible power supply in remote areas of the country.
Depending on the types of simultaneously used energy sources, 52 different operational conditions of the grid were established. The equations for maximum power take-off were derived.
Keywords: hybrid grid, solar batteries, wind turbine, power take-off, curcuit design.
OPTIMUM POWER TAKE-OFF IN HYBRID SELF-CONTAINED POWER GRIDS WITH UNCONVENTIONAL POWER SOURCES
Kokhreidze G.K. and Laoshvili D.P.
Georgian Technical University
Scientific and Engineering Center of Electric Power
A hybrid power grid with unconventional power sources is described. The grid can successfully be operated in remote regions, where the development of the power system is not envisaged and the cost of fuel is very high because of transportation. The hybrid power grid is based on simultaneous application of diesel-generators, storage batteries, photovoltaic antennas (solar elements) and wind turbines. The problem of optimum power take-off in the hybrid grid is considered. The problems of optimization of series-parallel connection of physical modules, effective conversion of direct current voltage into alternative current voltage with the help of the inverter, designing of the filters for reducing the sine signal distortion, etc. have been solved.
Keywords: electric power grid, photovoltaic antenna, wind turbine, separate inverter, power take-off.
COGENERATION - THE EFFECTIVE METHOD OF ENERGY SAVING AND OVERCOMING THE ENERGETIC CRISIS IN GEORGIA
Chitashvili G.P.
Georgian Technical University
The dual energy crisis (existing in power and heat supply) developed in Georgia has been analyzed. It was proved that overcoming the energy crisis in fast and effective way is mostly possible by constructing gas-turbine cogeneration plants. These plants can be designed on the basis of the existing boilers. It was figured out that the gas-turbine combined heat and power plants are the most effective, cheap and ecologically safe facilities of power and heat supply.
Operation of these plants will significantly reduce the use of organic fuel and will eliminate the basic power shortage existing in the energy system of Georgia.
Keywords: energy system, cogeneration, energy saving.
ON THE POSSIBILITY OF A COMPUTER MODEL IN CONTROLLING POWER SYSTEM STATES
Kamkamidze K.N., Gabrichidze Yu.D. and Paatashvili L.P.
Georgian Technical University
A mathematical model of development of the power system of Georgia is considered. The model was developed using the linear programming apparatus and the oriented graph. The equations of the capacity/power balance were obtained for the conditions of low water-level, interseason period and high water-level. The model can be employed both in the normal state of the power system and in emergency situations.
Keywords: power system, control, mathematical model.
PECULIARITIES OF THE POWER INDEXES OF ELECTRIC DRIVES OF JIG-BACK AERIAL TRAMWAYS
Laoshvili D.P. and Chunashvili B.M.
Georgian Technical University
Electric drive indexes of jig-back aerial tramways are considered. The methods of determining configurations and parameters of the cabin movement trajectory are presented. A typical loading diagram was drawn up for thorough investigation of the power peculiarities of electric drives of double-transit jig-back aerial tramways with intermediate supports. From the results of the investigation, it is evident that the sign of the electric drives total loading changes several times during one operational cycle. That fact is the basic cause of appearance of persistent electromechanic fluctuations deteriorating the power indexes of the electric drives.
Keywords: jig-back aerial tramway, electric drive, power indexes.
QUASIOPTIMUM CONTROL SYSTEM OF AN ASYNCHRONOUS ELECTRICAL DRIVE OF AERIAL TRAMWAYS
Chunashvili B.M.
Georgian Technical University
A simple and reliable method of controlling the speed and the critical moment of dynamic retardation of the asynchronous engine with a squirrel-cage rotor is considered. The method is based on application of the dynamic retardation sensor, the operation principle of which consists in the fact that, at a decrease in the engine rotation angular speed in the dynamic retardation mode, the engine magnetic flow changes insignificantly but, when the speed approaches the critical value of the moment, that flow increases abruptly. Basing on the described method, a quasioptimum control system for the asynchronous electrical drive of aerial tramways was developed. The system is characterized by high precision of positioning and improved dynamic indexes.
Keywords: aerial tramway, electrical drive, control system.
PROTECTION OF THE ELECTRIC TRACTION SYSTEM AGAINST OVERLOAD AND SHORT-CIRCUIT CURRENTS
Aburjania A.N., Gelashvili D.R., Museliani G.T., Maglakelidze A.K. and Prangishvili V.G.
Georgian Technical University
Georgian Railway Ltd
An induction shunt as a sensing element of the equipment protecting the electrified railway traction system against overload and short-circuit currents is considered. The adequate mathematical model and the equivalent circuits of the mentioned shunt are presented. There have been derived the equations for calculating the resistance ratios in the overload regime and the inductance ratios in the short-circuit regime, and for calculating the time of the protection response in the short-circuit regime.
Keywords: railway, electric traction, overload, short circuit, protection, induction shunt.
PROBLEMS OF SYNTHESIS OF OPTIMUM LOGIC STRUCTURES OF NETWORK DATABASES WITH CONSIDERATION OF DATA ADEQUACY REQUIREMENTS
Khurodze R.A., Kul'ba V.V., Gorgidze I.A. Karsanidze T.V., Gorgidze D.A. and Javakhadze G.S.
Georgian Technical University
Institute of Control Problems, Moscow, Russia
The problems of ensuring the adequacy of the data, represented in the logic structure of network databases (NDB) are solved by mapping of the canonical structure of the NDB into the logic one. That is provided with the help of distribution of the data groups by logic records and selection of the points of input into the structure.
Keywords: network database, data adequacy, canonical structure, logic structure, mapping.
RENEWABLE ENERGY SOURCES BASED ON NANOMATERIALS
Dadunashvili S.A.
Georgian Technical University
General principles of photoelectric conversion are described. The dimensional character of interaction of radiation with matter is considered. The features of photoelectric conversion in objects with a fractal structure are studied. The principles of fabrication of photoelectric converters on the basis of nanomaterials of a biological parentage are stated.
Keywords: photoelectric converters, fractal structures, nanomaterials, bacteriorhodopsin.
WIND ENERGETICS AND THE PROSPECTS OF ITS DEVELOPMENT IN GEORGIA
Zedginidze A.D., Lobzhanidze N.G., Pirtskhalaishvili A.N. and Rogava S.E.
Scientific Wind Energy Center "Karenergo"
The present state of wind energetics and the prospects of its development are considered. The part of the wind energetics in overcoming the problem of global changes in the Earth's climate is demonstrated. The preconditions and the prospects of constructing the windfarms in Georgia are analyzed. The places of possible location of the windfarms and their calculation parameters are noted. A brief review of the state of matter is presented with the aim of working out the wind energy cadastre of Georgia.
Keywords: wind energetics, windfarm, prospects, wind flow, cadastre.
HYDRODYNAMIC CALCULATION OF THE STARTING REGIME OF OIL AND GAS PIPELINES
Namgaladze D.P. and Gogua T.L.
Georgian Technical University
The hydrodynamic analysis of the starting regime of oil and gas pipelines has been carried out for the case when, at the pipeline end, there is a gate valve changing the flow rate by a linear law.The analytical solution, with the help of which it is possible to determine the pressure and rate in any section of the pipeline at the desired moment, has been obtained.
Keywords: oil and gas pipelines, gate valve, starting regime, hydrodynamic calculation.
ON CALCULATION OF SHUT-OFF FITTINGS OF OIL AND GAS PIPELINES
Namgaladze D.P. and Gogua T.L.
Georgian Technical University
The calculation procedure of the passage section in the case of uniform lifting of the shut-off devices is presented. The analytical dependence has been obtained and the corresponding graph has been plotted. The presented calculation procedure is intended for designing the gate of oil and gas pipelines.
Keywords: oil and gas pipelines, shut-off fittings, gate, calculation.
POWER EFFECTIVENESS AT APPLICATION OF HEAT PUMPS IN HEAT-SUPPLY SYSTEMS OF GREENHOUSES
Kiguradze O.D. and Jishkariani T.S.
Georgian Technical University
Absorption bromine-lithium heat pumps (ABLHP) are used for feeding hot water for heating technological media in industry, energetics, agriculture, etc. Application of the ABLHP in heat-supply systems of greenhouses can save 35-60% of fuel and power resources.
Keywords: greenhouse, heat supply, heat pumps.
ON THE PROBLEM OF THE STRATEGY OF INCREASING AND DEVELOPING THE OIL RESOURCES OF GEORGIA
Khmaladze G.J. and Khmaladze N.J.
G. Chogovadze Research Institute of Power Engineering and Power Constructions
Basing on the review and analysis of the international experience, the conclusion about urgency of working-out of the strategy of increasing and developing the oil resources of Georgia has been made. Guiding lines for working out the mentioned strategy are presented.
Keywords: oil, resources, strategy, increase, development.
ON IMPROVING THE MECHANISM OF PRODUCTION SHARING IN THE POWER INDUSTRY OF GEORGIA
Khmaladze G.J.
G. Chogovadze Research Institute of Power Engineering and Power Constructions
The model of production sharing being employed in the power industry of Georgia is critically estimated. With consideration of the specific features of Georgian oil fields, a modified version of estimation of optimum proportions of the production sharing is offered.
Keywords: power industry, production sharing.
ON THE STATE OF ELECTRIFICATION IN GEORGIAN AGRICULTURE (1970-1990)
Jikia O.V.
Research Institute of Economy and Social Problems
The review of the state and the development dynamics of electrification in Georgian agriculture in the period of 1970-1990 is presented. In other words, the period when Georgian power industry was an integral part of the Soviet Union. The comparison with the corresponding all-Union indexes allows to conclude that the present state of electrification in Georgian agriculture can be explained by serious lag admitted in the time of existence of the Soviet Union.
Keywords: electrification, Georgian agriculture, comparative analysis, present state.
