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Proceedings of the Technical university of Sofia, 1995 -: Recent submissions

Now showing items 141-160 of 853

Title: Постояннотоков цифров амперметър за лабораторни стендове Author: Ангелов, Иван; Angelov, Ivan Date: 2009 Abstract: When building a new laboratory stands or upgrading of old ones require measuring the current through the shunt in the circuits [1]. Shunt is connected to a suitable measuring system with a scale corresponding to its parameters. Such measuring systems are relatively difficult and expensive. On the market there are many types of digital voltage ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Аспекти на промените в управлението на електроенергийната система, свързани с директива 2009/72/ес и произтичащи от тях възможности Author: Кънева, Мария; Kaneva, Maria; Стоилов, Димо Георгиев; Stoilov, Dimo Georgiev Date: 2009 Abstract: The energy act in Bulgaria introduces new model for electricity market complying with Directive2009/72/EU that is to assure access to third party. In the dawn of common European market for electric energy it is important to study the possibilities for effective use of existing utilities as well as to introduce new for Bulgarian power system ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Изследване на енергийната ефективност на типови осветителни уредби в хотели Author: Николова, Камелия Симеонова; Nikolova, Kamelia Simeonova Date: 2009 Abstract: The current paper presents an analysis of the imposed ways in the lighting design practice of illuminating public areas with continuous working time in the most popular hotels (foyers). There are evaluated the annual expenses for illuminating these areas per square meter basis on multiple lighting design with different sources and controlling ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Система за мрежово управление и контрол на осветителни уредби в обществени сгради Author: Пачаманов, Ангел Саракинов; Pachamanov, Angel Sarakinov; Петринска, Ива; Petrinska, Iva; Матанов, Николай Стефанов; Matanov, Nikolai Stefanov Date: 2009 Abstract: The current paper presents a lighting monitoring and control system for public buildings, developed in the “Electrical Power Supply, Electrical Equipment and Electrical Transport” department of the Technical University – Sofia. The system consists of target units for the different rooms and a host unit for data storage. Every target unit ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Изменение на мощността на фотоволтаична система в експлоатационни условия Author: Платиканов, Стойо; Platikanov, Stoyo; Цанков, Пламен; Tsankov, Plamen; Маркова, Дешка; Markova, Deshka Date: 2009 Abstract: The Technical University of Gabrovo has participated in projects under JOULE, Copernicus and the Fifth Framework Program of the European Commission. The project entitled “PV Enlargement – Technology Transfer, Demonstration and Scientific Exchange Action for the Establishment of a Strong European PV Sector” under the Fifth Framework Program ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Конструирането на улични осветители съc светодиоди изисква нови бази знания Author: Василев, Христо Николов; Vasilev, Hristo Nikolov; Георгиев, Вълчан Тодоров; Georgiev, Vulchan Todorov; Ганчев, Ганчо; Ganchev, Gancho Date: 2009 Abstract: The LEDs are the future of the lighting technology. The power of the single LED is in the range of 1-5 W and more. Therefore certain issues concerning the thermal management and lighting flux control arise. The body of the luminaries increases in size and weight which hampers the construction of the optical; system. The design of LED ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Стенд за изследване на реактивни товари с променлив характер и тяхното компенсиране Author: Георгиев, Вълчан Тодоров; Georgiev, Valchan Todorov; Бойчев, Борислав Богданов; Bojchev, Birislav Bogdanov; Матанов, Николай Стефанов; Matanov, Nikolai Stefanov; Господинов, Васил Спасов; Gospodinov, Vasil Spasov Date: 2009 Abstract: The character of the reactive power of the load (leading or lagging) cash change according to the working regime in a specific topology of electrical power supply network. That can lead to significant financial expenditure dew to the power energy returned to the main. Different ways of compensation of reactive loads in such a case are ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Изследване на кaчеството на електрическата енергия в електроснабдителна система ниско напрежение захранваща помпена станция Author: Цветкова, Светлана Георгиева; Tzvetkova, Svetlana Georgieva; Петлешков, Ангел Стоянов; Petleshkov, Angel Stoyanov; Цанев, Цанчо Борисов; Tzanev, Tzancho Borisov Date: 2009 Abstract: The frequency drives are basic element in the automation and control systems of the pump units. The large use of frequency drives lead to worsen of the electrical energy quality indexes and increasing of the active power and electric energy losses in the basic elements of the electric supply system. Results from measurement and analysis of ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Изследване сезонните колебания на слънчевата енергия Author: Стоянов, Ивайло; Stoyanov, Ivaylo Date: 2009 Abstract: The result of continuous observations of the monthly solar radiation, on the territory of Ruse University from January 2005 to August 2009, have been presented in this study. The levels of solar energy for the different seasons and months of the year, and their influence on a low power photovoltaic system have been analyzed. Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Управление на инверторно асинхронно електрозадвижване с програмируем логически контролер от фамилията SIMATIC S7-200 НА SIEMENS Author: Павлов, Георги Митков; Pavlov, Georgi Mitkov; Димитров, Васил; Dimitrov, Vasil Date: 2009 Abstract: This paper presents the technical parameters and characteristics of a contemporary microprocessor control with a programmable logic controller (PLC) of the S7-200 series on an inverter asynchronous electrical drive. It is suggested to build a laboratory simulator, which meets the contemporary requirements for the educational and research ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Система за адаптивно управление на улични осветителни уредби Author: Пачаманов, Ангел Саракинов; Pachamanov, Angel Sarakinov; Матанов, Николай Стефанов; Matanov, Nikolai Stefanov; Христов, Константин; Hristov, Konstantin Date: 2009 Abstract: The current paper describes the functions of a control system for adaptive road lighting, developed in the “Electrical Power Supply, Electrical Equipment and Electrical Transport” department of the Technical University of Sofia. The system’s hierarchy consists of power line controllers, mounted in the base of the lighting poles and bridge ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Разработване на унифицирана методика за обучение по обследване енергийната ефективност на асинхронни електрозадвижвания Author: Динолов, Огнян; Dinolov, Ognjan; Андонов, Кондю; Andonov, Kondio; Кръстева, Анка; Krusteva, Anka; Коев, Константин; Koev, Konstantin Date: 2009 Abstract: Based on the constructed automated system a unified training procedure on energy-efficiency investigation in induction motor drives is developed. The procedure and the corresponding learning process, respectively, are organized into six main stages. In order to implement the procedure in the teaching and training of specialists, a computer ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Моделиране на приходите при анализ на проектите с възобновяеми източници на енергия Author: Андонов, Кондю; Andonov, Kondyu; Мартев, Красимир; Martev, Krasimir; Коев, Константин; Koev, Konstantin; Динолов, Огнян; Dinolov, Ognyan; Новакова, Атанаска; Novakova, Atanaska Date: 2009 Abstract: A solar photovoltaic energy park (117 kW) and a wind energy generator (225 kW) are investigated. An assessment and prognostic revenues methodology for sale and trading the harmful emissions of electrical produced energy by render an account of interests, inflation and the cost change of same energy is offers. The purpose of methodology is ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Стенд - симулатор на оперативни превключвания в електрически разпределителни уредби Author: Тодоров, Десислав; Todorov, Desislav; Крумов, Андрей Христов; Krumov, Andrej Hristov; Овчаров, Александър Хубенов; Ovcharov, Alexander Hubenov; Боев, Красимир Иванов; Boev, Krasimir Ivanov; Бакалски, Георги Благов; Bakalski, Georgi Blagov; Апостолов, Атанас; Apostolov, Atanas; Добрев, Добри Михайлов; Dobrev, Dobri Mihaylov; Драгостинов, Стефан; Dragostinov, Stefan; Гъркова, Маргарита; Gurkova, Margarita; Костова, Албена; Kostova, Albena; Вълчев, Емил; Valchev, Emil Date: 2009 Abstract: In „Electric Power Engineering“ Department at the Technical University of Sofia is designed and assembled switchgear installation control, supervision and interlocking simulator. Physical model gives opportunity to simulate operations in all switchgear systems with single and multiple bus bars, with one circuit breaker per bay, and introduce ... Library:
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Title: Изследване на умокрянето на нискоенергийни повърхности след плазмено-химично окисление Author: Динев, Петър Дончев; Dineff, Peter Donchev; Господинова, Диляна Николаева; Gospodinova, Dilyana Nikolaeva Date: 2009 Abstract: Cold plasma-chemical surface oxidation was applied into changing the hydrophilic-hydrophobic balance of polyester insulating film before and after ethyl alcohol surface cleaning. Two representative atmospheric plasma source were in use – symmetrical dielectric barrier co-planar diode discharge and asymmetrical or hybrid corona-dielectric ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Хомогенен атмосферен бариерен разряд Author: Динев, Петър Дончев; Dineff, Peter Donchev Date: 2009 Abstract: The Townsend quasi-homogeneous breakdown mechanism can be applied not only for low pressure but as well for relatively short air daps (5,26 cm) atatmospheric pressure. The real power surface density characteristic of atmospheric pressure dielectric barrier discharge reveals the existence of avalanche (quasihomogeneous) steady-state mode of ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Йонно-плазмено ецване и функционализиране на поли (диметилсилоксанови) повърхности Author: Динев, Петър Дончев; Dineff, Peter Donchev; Владкова, Тодорка; Vladkova, Todorka; Господинова, Диляна Николаева; Gospodinova, Dilyana Nikolaeva; Керанов, Иван; Keranov, Ivan Date: 2009 Abstract: Modification of polymer surfaces by changing the chemical structure, surface energy, and bonding characteristics has considerable technological importance in the area of biocompatibility. Interest has been increasingly in recent years directed to plasma oxidized poly(dimethylsiloxane) surfaces as bioactive substrate having a capacity to ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Еднофазен инвертор за възобновяеми източници на енергия, свързан с мрежата Author: Лазаров, Владимир Димитров; Lazarov, Vladimir Dimitrov; Зарков, Захари Живков; Zarkov, Zahari Zhivkov; Кънчев, Християн; Kanchev, Hristiyan Date: 2009 Abstract: This paper is devoted to the study of a single-phase inverter for connection of generator using renewable energy sources (RES) to the utility grid. A computer model of the inverter is developed. The model allows inverter operation with variable in the time input power. Thus the inverter can be easily connected to a DCDC converter with maximum ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Управлението на енергийните потоци в хибридна система с възобновяеми източници на енергия Author: Франсоа, Брюно; François, Bruno; Лазаров, Владимир Димитров; Lazarov, Vladimir Dimitrov; Нотон, Жил; Notton, Gilles; Стоянов, Людмил; Stoyanov, Lyudmil; Зарков, Захари Живков; Zarkov, Zahari Zhivkov; Кънчев, Християн; Kanchev, Hristiyan Date: 2009 Abstract: Taking intо account the variable primary sources character in the hybrid system of renewable energy sources and the consumers, powered by this system (some of them need a constant power source), the need of a power management in a hybrid system emerges. This article reviews the researches in the hybrid systems domain. Also the importance ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Моделиране и симулиране на синхронен генератор Author: Лазаров, Владимир Димитров; Lazarov, Vladimir Dimitrov; Спиров, Димитър; Spirov, Dimitar; Зарков, Захари Живков; Zarkov, Zahari Zhivkov; Стоянов, Людмил; Stoyanov, Ludmil Date: 2009 Abstract: This paper examines the process of modeling and simulation of synchronous generator with exciter and damper winding in the programming environment of Matlab/Simulink for use in complex wind energy conversion systems simulations. The aim is realized in the following stages: mathematical modeling, program integration and series of model ... Library:
TECHNICAL UNIVERSITY - SOFIA