Енергетика та системи керування (EPECS-2011). – 2011 р.

Permanent URI for this collectionhttps://ena.lpnu.ua/handle/ntb/19864

Матеріали IIІ Міжнародної конференції молодих вчених EPECS-2011

У збірнику опубліковано матеріали конференції, присвяченої проблемам у галузі енергетики. Видання призначено для науковців, аспірантів, студентів.

Енергетика та системи керування : матеріали IIІ Міжнародної конференції молодих вчених EPECS-2011, 24–26 листопада 2011 року, Україна, Львів / Міністерство освіти і науки, молоді та спорту України, Національний університет "Львівська політехніка". – Львів : Видавництво Львівської політехніки, 2011. – 139 с. – (3-й Міжнародний молодіжний фестиваль науки "Litteris et Artibus"). – Паралельний титульний аркуш англійською.

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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, Masood
Рermanent 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.
A novel on electricity market modeling based on game theory according to physical constraints
(Видавництво Львівської політехніки, 2011) Khodabakhsh, Javad
This 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.
DC power distribution for photovoltaic applications
(Видавництво Львівської політехніки, 2011) Cetin, Engin; Colak, Metin; Icli, Siddik; Iplikci, Serdar
In 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.
Design of an аutomatic сontroller for sustainable grid power supply in Bangladesh
(Видавництво Львівської політехніки, 2011) Raied, Hasan; Raquib, Ahmed
This 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.
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’ Rozario
In 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.
Differential evolutionary algorithm for distribution capacitor allocation considering varying load conditions
(Видавництво Львівської політехніки, 2011) Karimi, Mohammad
Many 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.
Energy saving using energy auditing techniques – a case study for a steel power plant
(Видавництво Львівської політехніки, 2011) Singh, Tejinder; Dhingra, Arvind
An 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.
Influnce of arrester model and transmission line tower footing resistance on lightning strike
(Видавництво Львівської політехніки, 2011) Nowruzi, Alireza; Lohi, Mohammad
One 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.
Mathematical model of the inertial object programmed control method
(Видавництво Львівської політехніки, 2011) Gapon, Anatoly; Savitskiy, Sergey; Rudakova, Natalia
The 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.
Maximum efficiency conditions of wireless power transfer between two helical wire antennas
(Видавництво Львівської політехніки, 2011) Shilandari, Arash; Niazmandian, S. Mostafa; Ebrahimi, Asqar; Malahzadeh, Alireza
The 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.
Modeling one typical digital differential relay in the MATLAB
(Видавництво Львівської політехніки, 2011) Ali Saket, Mohammad; Moghaddami, Masood; Alishahi, Ehsan
Differential 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.
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, Alireza
The 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.
Solution of optimal capacitor placement problem using improved differential evolutionary algorithm on radial networks
(Видавництво Львівської політехніки, 2011) Karimi, Mohammad; Shayeghi, Hossein
The capacitor placement problem consists of determining the optimal numbers, types, locations and sizes of capacitor banks such that minimum yearly cost due to power/energy losses and cost of capacitors is achieved, while the operational and power quality constraints are maintained within the required limits. This paper has proposed several improvement steps on differential evolutionary algorithm (DE) for obtaining improved differential evolutionary (IDE) algorithm. The obtained IDE has used for optimal placement and sizing of capacitor in radial distribution networks. The proposal method has been tested on 10-bus IEEE standard network. To demonstrate sufficiency and reliability of proposed IDE, this compared with other approaches in valid references.
Synchronized acoustic refrigerator and heat engine (SARAH)
(Видавництво Львівської політехніки, 2011) Banerjee, Aayan; Nayak, Gaurav
In light of the present global energy scenario, it is imperative to seek novel and efficient energy solutions to redress the situation. Solar energy, wind energy, geothermal energy, ocean thermoclines and waste heat recovery are the major players in the sustainable energy field. In this paper we propose a Synchronized Acoustic Refrigerator And Heat Engine (SARAH), a Thermoacoustic (TA) device capable of harnessing these untapped sources in a cost-effective and efficient way on both small and large scales. It is a coupled device which transforms acoustic power into heat (refrigerator or heat pump) and heat into acoustic power (engine or primemover).
Thermal lumped parameter modeling of a toroidal transformer
(Видавництво Львівської політехніки, 2011) Ali Saket, Mohammad; Jandaghi, Behzad; Moghaddami, M.; Oraee, Hashem
Toroidal transformers have some advantages, including smaller size in comparison with the same rating EI core transformers. This paper presents a simple but accurate thermal lumped parameter model for toroidal transformers to calculate different point temperatures. The model is also verified experimentally.
Various concerns regarding monitoring& measurement of power quality problems
(Видавництво Львівської політехніки, 2011) Singh, Tejinder; Dhingra, Arvind
Power quality has been catching the attention of researchers worldwide. With the advent of more and more semiconductor based equipments, the power quality standards have been re-written. There are many causes of power quality problems, voltage sags/swells, harmonics, fast impulses or subcycle impulses, neutral to ground high frequency noise etc. Some of these occur very frequently and cause problems and others (such as 1 nanosecond or 0.5 nanosecond impulses) either occur very rarely or cause problems rarely. It is important to evaluate power quality level and identify the source of faults that origin electrical disturbances in electrical power systems, which determines the responsibility of a bad quality of power. In order to evaluate and identify the disturbances and its origin, power quality monitoring is the tool that utilities and customers can use. This paper attempts to review the power quality issues including ways of monitoring power quality and also the effect of harmonics on power quality.
Аналіз виникнення та способів захисту від ферорезонансних процесів в мережах з ізольованою нейтраллю 6-35 кВ
(Видавництво Львівської політехніки, 2011) Роман Масляк
Розглянута проблема виникнення ферорезонансних процесів у мережах з ізольованою нейтраллю 6-35кв, проаналізовано умови виникнення ферорезонансу та запропоновано ефективний спосіб захисту від ферорезонансних процесів.
Аналіз проблем експлуатації вітроенергетичних установок
(Видавництво Львівської політехніки, 2011) Корендій, Віталій
У доповіді обґрунтовано доцільність використання вітроенергетичних установок (ВЕУ) як найбільш перспективних відновлюваних джерел енергії; зроблено аналіз найбільш актуальних еколого-економічних та технічних проблем, які виникають на стадіях проектування та експлуатації ВЕУ; описано різні варіанти схем управління ВЕУ з метою забезпечення максимального коефіцієнта їх використання.
Аналіз способів переміщення вантажів електромеханічною системою (ЕМС) баштового крана
(Видавництво Львівської політехніки, 2011) Клімченкова, Наталія; Корнієнко, Сергій
Проведено аналіз способів переміщення вантажів електромеханічної системою баштового крана. Дано рекомендації з підвищення ступеня автоматизації як електромеханічної системи крана, так і способів переміщення вантажів краном.
Визначення адресних перетоків потужності для енергопостачальних компаній
(Видавництво Львівської політехніки, 2011) Рильський, Сергій
В даній доповіді розкрито суть задачі адресності перетоків потужності для енергопостачальних компаній та запропоновано новий метод її вирішення на основі теорії чутливості. Показано переваги запропонованого медотоду над уже існуючими.