Енергетика та системи керування
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Item A comparison of genetic algorithm and immune algorithm in optimization of one typical axial flux permanent magnet motor(Видавництво Львівської політехніки, 2011) Alishahi, Ehsan; Ali Saket, Mohammad; Moghaddami, MasoodРermanent magnets motors are widely used in the industry due to their high efficiency and their small sizes. Axial flux permanent magnet motors are new generation of permanent magnet motors and they are mainly used as propulsion of electrical vehicles. First in this paper, equations which are related to design of one typical slot less bidirectional axial flux motor have been proposed. These equations have been used in order to optimize key parameters of motor with two optimization methods: genetic algorithm and immune algorithm. Finally results have been presented and one can see that immune algorithm is better than genetic algorithm in optimization of this kind of motor.Item A novel on electricity market modeling based on game theory according to physical constraints(Видавництво Львівської політехніки, 2011) Khodabakhsh, JavadThis paper conduct a general comparative study on game theory based models for electricity market performance according to network physical constraints. Main paper focus is on quantity based offering method. Therefore, some methods in this category evaluated and market performance index introduced for numerical judgment.Item Application of technology of utilization associated petroleum gas for power generation(Видавництво Львівської політехніки, 2013) Vysotskiy, Andrey V.There are power plants, whose application would be most practical for primary crude oil processing stations. The power plant is intended for generating electricity as well as, if necessary, for using of heating energy. As well as the other power plants under control of the operator’s console, the reception department operates an industrial programmable controller. The controller manages the operation of the discrete and analog input/output to which measuring instruments are connected (flow meters, level meters, temperature sensors, etc.). The number of measuring instruments and actuators, if necessary, is determined by the process diagram of power plant for the oil processing unit. Hence, most active oil and refinery іnterprises are looking for the application of intelligent and integrated in production manufacturing systems of cogeneration in order to meet the customer demands and be the winners in the competitive market in that field. With available technologies and systems in the field of cogeneration and its related technologies, such application for primary crude oil processing is a reality and can meet the need of the enterprises. Today technical mangers are confused with varying equipment that prevail in this field. This article is aimed at overcoming the confusion with the new technologies that have been generated in the past five years. Further, this paper showes that all these new proposals are indeed very important and can be applicable for primary crude oil processing and cogeneration. Finally, this article focuses on latest research developments towards modern cogeneration system for primary crude oil processing stations.Item DC power distribution for photovoltaic applications(Видавництво Львівської політехніки, 2011) Cetin, Engin; Colak, Metin; Icli, Siddik; Iplikci, SerdarIn this study, a DC power distribution system constructed for a micro photovoltaic power plant is examined. For this purpose, a 5 kW photovoltaic panel group and a DC power distribution panel which has 12 V and 24 V DC/DC converters were constructed and investigated. Finally, some experimental outputs such as DC/DC converter efficiencies are presented.Item Design of an аutomatic сontroller for sustainable grid power supply in Bangladesh(Видавництво Львівської політехніки, 2011) Raied, Hasan; Raquib, AhmedThis paper presents a proposed model of an automated controlling unit for distributing electricity generated from solar panels and windmills (hybrid connection) simultaneously to a small locality through a smart grid connection. The power sources will simultaneously provide electricity and will also store energy in a suitable storage medium (batteries). A central controller will distribute the collected power to the locality or store it as needed. The proposed model is suitable for tropical regions since both solar and wind energies are incorporated into the system. Since the geographical local of Bangladesh favors harvesting both these renewable sources of energy, this system can be ideal for places where electricity is still unknown.Item Design of marketing system of control by energy consumption modes at the retail power market(Видавництво Львівської політехніки, 2013) Petrova, Kate; Serebrennikov, BogdanThe methods of managing the modes of electric load for structural levels of the power system were examined. The effectiveness of marketing approach of forming the energy efficient modes of power consumption in transformed model of power market were proved. The levels of segmentation of the retail power market were grounded, the relevant criteria for consumers' segmentation considering their specifics of power consumption mode regulation were determined. The significance of criteria was proposed to consider in calculation of differentiated prices.Item Designing the feedback system for a DC motor to control its angular movement and speed using microcontroller(Видавництво Львівської політехніки, 2011) Raquib, Ahmed; Brian, D’ RozarioIn today’s world, technology is evolving fast and with expensive and complicated equipments we are able to achieve greater accuracy. This paper presents a simplified and an inexpensive model for replacing more complicated feedback systems like optical encoder using a laser unit, a Light Dependent Resistor (LDR) and a microcontroller in an environment where very high accuracy is not required. Usually it is very difficult to control the speed of a DC motor since it varies with the supplied voltage, but this feedback system can be used to control the movement angle and speed of a DCmotor.Item Differential evolutionary algorithm for distribution capacitor allocation considering varying load conditions(Видавництво Львівської політехніки, 2011) Karimi, MohammadMany loads in power systems are inductive loads then consume reactive power, this fact lead to drop voltage and in worst case blackout and collapse voltage. Best option in distribution networks for avoid of this problem is installation of capacitor bank. In capacitor installation, finding optimal location and size of capacitor have special importance. In this paper, Differential Evolutionary (DE) algorithm is proposed for optimal placement and sizing of capacitor. Our objective function includes the minimization of investment costs and energy losses. Load of network has been considered in three levels. The proposal method has been tested on 34-bus radial distribution system and results of simulation have been compared with several valid reference.Item Dynamic simulation of a load system driven by two identical PMDC motors(Видавництво Львівської політехніки, 2013) Atalay, Ahmet Kubilay; Kocabas, Derya Ahmet; Basdogan, SedaIn this study, dynamic simulation of a load system driven by two identical permanent magnet direct current (PMDC) motor is performed by MATLAB / SIMULINK. In the dynamic simulation, two equivalent motors are tandem operated both at same voltage and different voltages in order to drive a mechanical load. The current of each motor, total induced torque and steady state speed of the entire drive system are obtained. It is seen that, when the motors are supplied by the same voltage they share the load equally. On the other hand, if they are operated with different voltages, the motor which is supplied with lower voltage always operates as a generator and the motor which is supplied with higher voltage is overloaded in order to supply the other one and drive the mechanical load.Item Energy saving using energy auditing techniques – a case study for a steel power plant(Видавництво Львівської політехніки, 2011) Singh, Tejinder; Dhingra, ArvindAn industry is the major commercial energy consuming sector in India, where electrical energy is the most common and widely used type of energy. As the demand and price of energy are increasing day by day. Therefore, the subject of energy conservation is a concern for most energy users particularly industry. Judicious use of energy becomes imperative for third world developing country being presence of energy crisis. This paper provides some measure for energy saving that can be commonly recommended for a rolling unit of steel industry. A case of hot rolling unit in JSL Stainless Ltd., Hisar for energy conservation is given. Overall improvement in energy consumption in light of the stated recommendation is illustrated along with the proposed utilization of the techniques and their applications. Energy conservation in conventional motor with replacement or use of star delta star converter, reduction in cable losses, replacement of filament of LED lamps, replacement of conventional transformer with cast resin dry type transformer and provision of energy management system for energy conservation and per unit production cost reduction are elaborated in this paper.Item High gradient magnetic separation for powder material processing(Видавництво Львівської політехніки, 2013) Idziaszek-Gonzalez, Alicja; Kozlowski, WaldemarHigh gradient magnetic separators are widely used in both research and industry. The aim of the work is the analysis of magnetic separation for powder material processing. The paper presents the simulations of magnetic field for magnetic separators with various filter shapes. Finite Element Analysis has been used to get the magnetic field over the studied separator grid.Item Increasing efficiency of radiant heating systems’ work(Видавництво Львівської політехніки, 2013) Shepitchak, Volodymyr; Zhelyh, VasylThe possibility of the application of energy efficient heating systems based on infrared light for heating industrial premises has been analyzed in the article. The experimental studies of temperature condition exposure zone of the rotary infrared heaters. The rotary radiation heater represents the distribution of the exposure intensity depending on the height disposition. The results are presented in graphical interpretation.Item Influnce of arrester model and transmission line tower footing resistance on lightning strike(Видавництво Львівської політехніки, 2011) Nowruzi, Alireza; Lohi, MohammadOne of the fundamental issues is phenomenon lightning in transmission system that constantly challenge the design of transmission lines. in this paper by modeling transmission network elements, over voltage cause by lightning andmaximum quantity on isulator chain for two state, i.e. while lightning strike on tip of tower, and impact on guard wires between two tower at the substation terminal tower, and infulance of footing resistance tower on this process ,are simulated, and then for state, direct storke to phase conductor and generated over voltage in power transformer and effect of arrester on reduction of this over voltage is discussed. The study was carried out on an actual power network in south of Iran (Bandar-abbas Power plant to janah station) at 400 KV voltage level,and simulation are performed using EMTP-RV software.Item Investigation of light intensity and temperature dependency of solar cells electric parameters(Видавництво Львівської політехніки, 2013) Tobnaghi, Davoud Mostafa; Madatov, Rahim; Farhadi, PayamIn this paper, the performance and overview use of solar cells is expressed. The role of temperature, sunlight intensity on the solar cells electric parameters has been studied. Experimental results the amount of solar cell output parameters variations such as maximum output power, open circuit voltage, short circuit current, and fill factor in terms of temperature and light intensity shows. the most significant is the temperature dependence of the voltage which decreases with increasing temperature. Also output current of solar cells is directly proportional to the light intensity. The best performance of solar panels in sunny and cold day has been suggested. Obtained results could lead to optimal use of solar cells.Item Mathematical model of the inertial object programmed control method(Видавництво Львівської політехніки, 2011) Gapon, Anatoly; Savitskiy, Sergey; Rudakova, NataliaThe article deals with the development of the extrapolator mathematical model of the software management system for the objects with the distributed parameters, which possess properties of the linear object with self-alignment.Item Maximum efficiency conditions of wireless power transfer between two helical wire antennas(Видавництво Львівської політехніки, 2011) Shilandari, Arash; Niazmandian, S. Mostafa; Ebrahimi, Asqar; Malahzadeh, AlirezaThe aim of the study is to codify a computational procedure for the study and analysis of the wireless power transfer between two helical wire antennas. Using this method, we can study the effective factors such as distance, loading and antennas’ sizes on wireless power transfer and delineate the conditions which maximize the efficiency of the wireless power transfer. In the suggested method, using the applied method of moment (MOM) in FEKO software, current distribution and scattering parameters of a two-port wireless power transfer system for different distances are determined. Subsequently, using circuit analysis, we appoint the efficiency of wireless power transfer for different amounts of load resistance and different amounts of transfer distances and the angles between the axle of two helixes and then we compare them with each other. Using repeater helical wire which has the similar structure of the previous helix structures, we can improve the efficiency of wireless power transfer in 3meter distance to 35 percent.Item Methods of improving the reliability of distribution networks 6-35 kV(Видавництво Львівської політехніки, 2013) Shkrabets, Fedor; Kyrychenko, MarynaThe causes of damage to distribution networks are considered and the main methods for insulation condition monitoring as well as fault detection and location are described.Item Modeling one typical digital differential relay in the MATLAB(Видавництво Львівської політехніки, 2011) Ali Saket, Mohammad; Moghaddami, Masood; Alishahi, EhsanDifferential relays are widely used in the Power networks as a protection for power transformers, bus bars and generators. This paper aims tomodel one typical differential relay in the SIMULINK environmental. This model has been simulated in the MATLAB program and the results confirmed truth of the proposed model. Also, thismodel is used to build differential relay block inMATLAB software. SinceMATLABsoftware does not have a differential relay block, this block can be used in other power system's simulations as a differential relay.Item Quasi static approximation of wireless power transfer systems through coupled resonance and improving power transfer efficiency(Видавництво Львівської політехніки, 2011) Shilandari, Arash; Niazmandian, S. Mostafa; Ebrahimi, Asqar; Malahzadeh, AlirezaThe aim of the study is to transfer power wirelessly through the resonance of the source and the device antennas. Since transferring system frequency from the frequency of the antenna resonance strongly decreases power transfer efficiency, in this paper, a wireless power transfer system consisting of two helix resonance antennas is analyzed through quasi-static approximation in a circuit model and among the scientific papers; few works have been done in this regard. The presented circuit model reveals the difference between the two possible driving methods in wireless power transfer systems via coupled resonances. It also shows that the presented quasi-static approximation of wire helix resonant frequency is in a good agreement with the experimental results. In addition, the equivalent circuit elements of the wireless power transfer system via strongly coupled resonances are presented and measured to improve the transferred power and the maximum quality factor.Item Role of biomass resources in promotion of renewable energy(Видавництво Львівської політехніки, 2013) Singh, Tejinder; Dhingra, ArvindThe world especially the developing countries are facing an increasing power crunch. The conventional energy resources are fast depleting and there is an urgent need to find out new avenues of energy to cater to this increasing demand. It is here the energy from biomass finds its place. Although we have been using energy from biomass since the time man learned to burn wood for energy but with the growing technological innovations this energy can be harnessed to meet the growing energy demands. On a worldwide scale Biomass contributes about 12% to today's primary energy supply, rising between 40% and 50% in most developing countries. Biomass fuel obtained from purpose-grown energy crops as well as forests and agricultural waste are being used in power plants and it is very competitive in price and quality with fossil fuels. Applying biomass technology is both an environmental and human necessity, whether on a local scale to get rid of slurries, waste and refuses, or on a global scale to reduce carbon dioxide content in the atmosphere and hence reduce global warming. Scientists are busy in developing different ways of converting biomass into a form that meets our energy needs, while making best use of the available energy. In this paper an attempt has been made to project the biomass conversion and the new emerging techniques of harnessing power from biomass and also from the other biofuels such as Bio-oil and Bioethanol. Hence an attempt has been made through different techniques in this paper that in developing country like India, how much emphasis need to be given on such renewable energy sources for preservation of conventional sources of energy.