Showing papers by "Ivanovo State Power University published in 2015"
TL;DR: The results obtained from laboratory investigations and industrial tests of the proposed technologies carried out at different thermal power plants are presented in this paper, where the possibilities of improving the process and environmental indicators of water treatment plants are shown.
Abstract: Prospective and existing technologies for water treatment at thermal power plants, including pretreatment, ion exchange, and membrane method are considered. The results obtained from laboratory investigations and industrial tests of the proposed technologies carried out at different thermal power plants are presented. The possibilities of improving the process and environmental indicators of water treatment plants are shown.
12 citations
TL;DR: In this article, an integrated assessment is given for quality factors for different types of astatic electromechanical systems that are constructed based on a combination of the harmonic disturbance internal model principle (selective invariance) with other principles of control theory (cascade control, subordinate control with series compensation, state control, polynomial output control, and separation of motion rates).
Abstract: Based on modal control methods, structural and parametric synthesis is carried out and an integrated assessment is given for quality factors for different types of astatic electromechanical systems that are constructed based on a combination of the harmonic disturbance internal model principle (selective invariance) with other principles of control theory (cascade control, subordinate control with series compensation, state control, polynomial output control, and separation of motion rates). Methods are proposed for comparison and structural optimization of systems synthesized by using a combination of the specified methods in accordance with a defined complex of main and additional quality criteria: optimization of the constant and harmonic components of load torque disturbances, the range of acceptable variations of the inertia moment of the mechanical part, the level of pulsations of output speed signals when noise is on its measuring channel, the maximum value of signals time delay in the power converter when the system is stable, and the total degree of regulator dynamic blocks. The results show how the selected quality factors that are the most important for a designer are emphasized when the designer applies a combination of different system generation principles, which makes it possible to reasonably choose the most effective structural solution.
7 citations
TL;DR: In this paper, the reduction of the noise and vibrations via application of multiphase machines (m > 3) is conditioned by a decrease in tangential forces caused by pulsations of the electromagnetic torque of the motor.
Abstract: The reduction of the noise level and vibrations of a modern electrical drive are very significant problems during its development. The methods for solving this problem in the context of traditional threephase electromechanical systems are rather well studied but, however, have exhausted themselves in many respects. One promising variant for designing alternating-current asynchronous and synchronous motor drives with enhanced vibronoise characteristics is constructing it based on an actuating motor with an increased number of phases. On the one hand, the reduction of the noise and vibrations via application of multiphase machines (m > 3) is conditioned by a decrease in tangential forces caused by pulsations of the electromagnetic torque of the motor. This is connected with the fact that an increase in the number of phases of the stator winding causes the sparseness of the harmonic composition of the field in the air gap and the elimination of asynchronous harmonics from it with a relative increase in synchronous ones. On the other hand, an increase in the number of phases substantially expands the possibilities for noise level reduction because of a decrease in radial magnetic forces acting between the stator and the rotor and causing dynamic deformations of the stator ring. Techniques for optimization of vibronoise characteristics of the asynchronous and synchronous motor drives and realization of their control system structure are proposed. Results of investigations of multiphase electromechanical systems that show the efficiency of the proposed solutions are given.
5 citations
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TL;DR: In this article, the authors deal with the special economic zones (SEZs) of the Russian Federation, which became an important element of the state national innovation system, and the main purpose of creation of SEZs is coping with strategic tasks connected with the development of the whole state or its territories, such as foreign trade, economic, social, regional and scientific-technical ones.
Abstract: Russian Abstract: (В статье рассматриваются особые экономические зоны (ОЭЗ) Российской Федерации, которые являются важным элементом национальной инновационной системы государства. Они представляют собой ограниченные территории в регионах с особым юридическим статусом по отношению к остальной территории и льготными экономическими условиями для национальных или иностранных предпринимателей. Главная цель создания ОЭЗ – решение таких стратегических задач развития государства в целом или отдельной территории, как внешнеторговых, общеэкономических, социальных, региональных и научно-технических).English Abstract: The article deals with the special economic zones (SEZs) of the Russian Federation, which became an important element of the state national innovation system. SEZ are limited territories in the regions with the special legal status in comparison with the rest of the territories and favorable economic conditions for Russian and foreign entrepreneurs. The main purpose of creation of special economic zones is coping with strategic tasks connected with the development of the whole state or its territories, such as foreign trade, economic, social, regional and scientific-technical ones.
5 citations
TL;DR: In this article, a procedure for calculating the residual concentration of carbonic acid in deaerated water and the decarbonization effect from the change in the pH value (ΔpH) is presented together with an example of calculation carried out by specialists of the Ivanovo State Power Engineering University based on a long-term industrial experiment performed on DSA-300 atmospheric deaerators.
Abstract: According to the water coolant quality standards, the makeup water supplied to a thermal power plant’s (TPP) steam-generating systems must not have any content of free carbonic acid. As a rule, free and partially bound carbonic acid is removed from makeup water supplied to the power-generating boilers at TPPs in atmospheric deaerators. Their performance as decarbonizers can be evaluated by measuring the pH values of water supplied to the deaerator and of the deaerated water. A procedure for calculating the residual concentration of carbonic acid in deaerated water and the decarbonization effect from the change in the pH value (ΔpH) is presented together with an example of calculation carried out by specialists of the Ivanovo State Power Engineering University based on a long-term industrial experiment performed on DSA-300 atmospheric deaerators.
4 citations
TL;DR: The results obtained from combined numerical and experimental investigations of the water decarbonization process carried out in atmospheric-pressure deaerators without subjecting water to steam bubbling in the deaerator tank are presented in this article.
Abstract: The results obtained from combined numerical and experimental investigations of the water decarbonization process carried out in atmospheric-pressure deaerators without subjecting water to steam bubbling in the deaerator tank are presented. More exact values of the hydrocarbonate thermal decomposition rate have been obtained, and the hypothesis about a change of the process governing mechanism in shifting to low total alkalinity values of deaerated water has been proven in the course of these investigations. A procedure for predicting the indicators characterizing the water decarbonization efficiency in using deaerators is proposed based on the obtained study results. The developed procedure features the maximally possible accuracy that can be achieved at the metrological characteristics of the standard alkalinity measurement methods.
4 citations
TL;DR: In this article, the problem of striking material and energy balances from the data received by thermal power plant computerized automation systems from the technical accounting systems with the accuracy determined by the metrological characteristics of serviceable calibrated instruments is formulated using the mathematical apparatus of ridge regression method.
Abstract: The problem of striking material and energy balances from the data received by thermal power plant computerized automation systems from the technical accounting systems with the accuracy determined by the metrological characteristics of serviceable calibrated instruments is formulated using the mathematical apparatus of ridge regression method. A graph theory based matrix model of material and energy flows in systems having an intricate structure is proposed, using which it is possible to formalize the solution of a particular practical problem at the stage of constructing the system model. The problem of striking material and energy balances is formulated taking into account different degrees of trustworthiness with which the initial flow rates of coolants and their thermophysical parameters were determined, as well as process constraints expressed in terms of balance correlations on mass and energy for individual system nodes or for any combination thereof. Analytic and numerical solutions of the problem are proposed in different versions of its statement differing from each other in the adopted assumptions and considered constraints. It is shown how the procedure for striking material and energy balances from the results of measuring the flows of feed water and steam in the thermal process circuit of a combined heat and power plant affects the calculation accuracy of specific fuel rates for supplying heat and electricity. It has been revealed that the nominal values of indicators and the fuel saving or overexpenditure values associated with these indicators are the most dependent parameters. In calculating these quantities using different balance striking procedures, an error may arise the value of which is commensurable with the power plant thermal efficiency margin stipulated by the regulatory-technical documents on using fuel. The study results were used for substantiating the choice of stating the problem of striking material and fuel balances, as well as the method for solving it. With the problem statement and the solution method implemented in the real thermal power plant computerized automation systems, less biased calculation of actual thermal efficiency indicators of equipment is obtained.
3 citations
TL;DR: In this article, the appearance of the alternating magnetic field component caused by bubble oscillations in a magnetized magnetic fluid can be used to develop a fundamentally new method for supplying small metered gas shots to a reactor, as well as to study the boiling process in a magnetic fluid.
Abstract: The elastic oscillations of air bubbles separated from an air cavity compressed by the ponderomotive forces of a magnetic field in a magnetic fluid are accompanied by the appearance of an alternating magnetic field component. The frequency of the alternating component corresponds to the frequency of radial bubble oscillations, and this fact is used to determine the bubble size. A great body of experimental data has been obtained from six magnetic fluid samples with different viscosities. Based on these data, histograms illustrating the bubble radius distribution are plotted. The appearance of the alternating magnetic field component caused by bubble oscillations in a magnetized magnetic fluid can be used to develop a fundamentally new method for supplying small metered gas shots to a reactor, as well as to study the boiling process in a magnetic fluid.
3 citations
03 Dec 2015
TL;DR: The choice of the form and parameters of root distribution of the characteristic equation which define dynamic model of mechatronic modules is considered in this paper, where analytical relations and techniques of practical calculations of parameters of distributions for given value of bandwidth are offered.
Abstract: The choice of the form and parameters of root distribution of the characteristic equation which define dynamic model of mechatronic modules is considered. Time and frequency response of the most known distributions are investigated. Analytical relations and techniques of practical calculations of parameters of distributions for given value of bandwidth are offered. It is shown that Besselian root distribution gives advantages on speed and monotony before other distributions and provides the minimum distortions at realization of control signals also.
3 citations
TL;DR: In this paper, the electrochemical behavior of concentrated solutions of lithium hexafluoroarsenate in tetrahydrofuran and methyl acetate, having low dielectric constants, was studied.
Abstract: The electrochemical behavior of the concentrated solutions of lithium hexafluoroarsenate in tetrahydrofuran and methyl acetate, having low dielectric constants, was studied. Their high specific conductivity compared with solutions of this ionophore in highly polar solvents (propylene carbonate, γ-butyrolactone) may be due to the additional contribution from the charge transfer by the ionotropic mechanism. Voltammetric curves were obtained on a platinum electrode for LiAsF6 solutions in tetrahydrofuran and methyl acetate. The efficiency of lithium cycling in the systems was evaluated.
2 citations
TL;DR: In this article, the authors present a technique for the calculation of the thermal equivalent circuit parameters for the high-voltage cable line laid in the ground, which allows one to predict heating of cables on the day ahead in order to prevent thermal degradation of the insulation.
Abstract: This paper is concerned with the development of techniques to the calculation of the thermal equivalent circuit parameters for the high-voltage cable line laid in the ground. The topology of the scheme was developed in author’s previous publication. This article discusses the parameters of the circuit which simulate the environment of the cable line. Calculation techniques of these parameters are described for cables laid in a plane and a trefoil pattern. The proposed scheme allows one to predict heating of cables on the day ahead in order to prevent thermal degradation of the insulation.
TL;DR: In this article, the authors consider the operating reliability of power transformers, autotransformers and shunting reactors in order to reduce the risk of damage, which accompanies internal short circuits and equipment fires and explosions.
Abstract: Methods of increasing the operating reliability of power transformers, autotransformers and shunting reactors in order to reduce the risk of damage, which accompany internal short circuits and equipment fires and explosions, are considered.
TL;DR: In this article, the authors developed a method to determine the minimum indoor air temperature under standby heating using heat-reflective shields in the windows and a multifunctional energy-efficient shutter with solar battery.
Abstract: The new energy saving windows with heat-reflecting shields are well known, but for their practical use they need to be integrated into the automated system for controlling heat supply in buildings and the efficiency of their use tоgether with the existing energy-saving measures must be determined. The study was based on the results of field tests of windows with heat-reflective shields in a certified climate chamber. The method to determine the minimum indoor air temperature under standby heating using heat-reflective shields in the windows and multifunctional energy-efficient shutter with solar battery have been developed. Annual energy saving for the conditions of different regions of Russia and France was determined. Using windows with heat-reflecting screens and a solar battery results in a triple power effect: reduced heat losses during the heating season due to increased window resistance; lower cost of heating buildings due to lowering of indoor ambient temperature; also electric power generation.
03 Dec 2015
TL;DR: In this article, a comparative analysis of power factor corrector (PFC) based control algorithms for the asynchronous electric drive with multiphase PFC is presented. But, the performance of these algorithms is limited.
Abstract: The energy efficiency of the asynchronous electric drive can be improved by introducing a power factor corrector (PFC) as its constituent part. The greatest effect of increasing the power factor and improving the electromagnetic compatibility of the electric drive is achieved by using multiphase PFC. However, control algorithms of electric drives with such power factors are studied insufficiently. Therefore, a comparative analysis of these algorithms according to their performance criteria is required.