Multi objective optimization in charge management of micro grid based multistory carpark

Distributed power supply with the use of renewable energy sources and intelligent energy flow management has undoubtedly become one of the pressing trends in modern power engineering, which also inspired researchers from other fields to contribute to the topic. There are several kinds of micro grid platforms, each facing its own challenges and thus making the problem purely multi objective. In this paper, an evolutionary driven algorithm is applied and evaluated on a real platform represented by a private multistory carpark equipped with photovoltaic solar panels and several battery packs. The algorithm works as a core of an adaptive charge management system based on predicted conditions represented by estimated electric load and production in the future hours. The outcome of the paper is a comparison of the optimized and unoptimized charge management on three different battery setups proving that optimization may often outperform a battery setup with larger capacity in several criteria.Web of Science117art. no. 179

Machine-Learning Methods in Natural Language Processing

Práce se zabývá automatickým značkováním českého jazyka za pomocí existujících implementací, využívajících model Conditional Random Fields a algoritmy L-BFGS a SDG. Jsou popsány základní pravidla značkování a problémy, se kterými se tento obor potýká v případě zpracování českého jazyka. Čtenáři jsou vysvětleny principy použitých algoritmů a modelů, které jsou implementovány v programech CRF++ a CRFSuite. Práce se poté zaměřuje na vlastní testování úspěšnosti na českém korpusu a snaží se nalézt nejvhodnější hodnoty parametrů při využití všech rysů. Při nalezení rozumného kompromisu mezi časem a přesností se poté snaží tuto hodnotu ještě zpřesnit za pomoci analýzy přínosu jednotlivých rysů a možností jejich vynechání.Firstly, basic rules of tagging of the Czech language are described as well as problems connected to this field. Thereafter the focus of the thesis is put on the success rate of testing on the Czech corpus and at the same time trying to find the most suitable parameter values for using the features. After reaching a reasonable compromise between duration and accuracy, the value is then attempted to be improved using analysis of separate features and their eventual omission.

Low-cost extra-low voltage LED dimmer for tuneable white lighting

The colour appearance of light sources has a major impact on how people perceive space. With LED illumination lighting, the colour output can be tuned to virtually any perceivable colour, including any hue of white light. It has been established that the right shade of white light during the 24-hour day cycle has a positive effect on the human body's biological system. For this reason, it is very important to focus on the development and application of new lighting systems that have dynamically variable light outputs in order to imitate the sunlight. Circadian regulation is most responsive to short-wavelength light (460 nm = blue colour). This paper describes the development of a low-cost extra-low voltage LED dimmer for tunable white lighting systems aiming to achieve maximum electrical performance and light-output. This dimming module has two independent LED control channels and allows for a variable colour temperature control from warm white to cold white light. Experimental results of the dimming module efficiency measurements, correlated colour temperature (CCT), colour rendering index (CRI), illuminance and power consumption of the luminaire depending on the duty cycle for different control frequencies (200 Hz, 1.5 kHz, 5 kHz, 10 kHz and 20 kHz) are presented. The paper further describes the principle of creating control curves for an independent regulation of correlated colour temperature and illuminance. In the form of a table, the control curve outputs may be uploaded into a microcontroller. The paper details the construction, function and the advantages of this LED dimmer prototype.Web of Science253494

Towards the text compression based feature extraction in high impedance fault detection

High impedance faults of medium voltage overhead lines with covered conductors can be identified by the presence of partial discharges. Despite it is a subject of research for more than 60 years, online partial discharges detection is always a challenge, especially in environment with heavy background noise. In this paper, a new approach for partial discharge pattern recognition is presented. All results were obtained on data, acquired from real 22 kV medium voltage overhead power line with covered conductors. The proposed method is based on a text compression algorithm and it serves as a signal similarity estimation, applied for the first time on partial discharge pattern. Its relevancy is examined by three different variations of classification model. The improvement gained on an already deployed model proves its quality.Web of Science1211art. no. 214

An examination of thermal features' relevance in the task of battery-fault detection

Uninterruptible power supplies (UPS), represented by lead-acid batteries, play an important role in various kinds of industries. They protect industrial technologies from being damaged by dangerous interruptions of an electric power supply. Advanced UPS monitoring performed by a complex battery management system (BMS) prevents the UPS from sustaining more serious damage due to its timely and accurate battery-fault detection based on voltage metering. This technique is very advanced and precise but also very expensive on a long-term basis. This article describes an experiment applying infrared thermographic measurements during a long term monitoring and fault detection in UPS. The assumption that the battery overheat implies its damaged state is the leading factor of our experiments. They are based on real measured data on various UPS battery sets and several statistical examinations confirming the high relevancy of the thermal features with mostly over 90% detection accuracy. Such a model can be used as a supplement for lead-acid battery based UPS monitoring to ensure their higher reliability under significantly lower maintenance costs.Web of Science82art. no. 18

Analysis of Impacts of the Covid-19 Pandemic in a Small Industrial Company

Hlavním cílem bakalářské práce je vytvořit analýzu podniku během pandemického období. Sledovanou firmou je malá průmyslová firma v oblasti zemědělství a potravinářství. Zabývám se hrozbami pro podnik z vnějšího okolí, které mají vliv na vnitřní fungování podniku. Práci rozebírám jak z teoretické části, tak z praktické. Zaměřuji se na podnikovou strategii, identifikaci rizik, zvládání rizik a optimalizaci. Pandemie totiž podnik ovlivnila z pohledu nákupní činnosti, výrobní i obchodní činnosti, pracovní činnosti a pracovníků. Tato práce bude sloužit firmě Beskyd Fryčovice, a.s. jako analýza a rekapitulace pandemického období.The main target of the bachelor thesis is to create an analysis of the company during the pandemic period. The monitored company is a small industrial company in the field of agriculture and food. I deal with threats to the company from the outside environment, which affect the internal functioning of the company. I analyze the work from the theoretical part and from the practical part. I focus on corporate strategy, risk identification, risk management and optimalization. The pandemic affects the company in terms of purchasing activities, production and business activities, work activities and workers. This work will serve the company Beskyd Fryčovice, a.s. as an analysis and recapitulation of the pandemic period.345 - Katedra mechanické technologievýborn

Modular Intelligent Image Storage

Import 26/06/2013Zjednodušenie a zjednotenie prístupu k určitému problému v informatike je cieľom akéhokoľvek rámcového riešenia, inak povedané frameworku. V rámci diplomovej práce som sa snažil využitím dostupných metód a spôsobov nasadenia, pokryť požiadavky zadania za účelom zisku čo najjednoduchšie rozšíriteľného riešenia. Uvedomenie si pojmu digitálneho spracovania obrazu a postavenie zadania na tomto požiadavku, tvorilo profilovanie konkrétneho využitia celého projektu. Diplomová práca postupne prechádza jednotlivými etapami vývoja od objasnenia problematiky oblasti, cez výber technológií vhodných pre riešenie, ďalej popisuje jednotlivé naimplementované celky a ich dôležité detaily. Súčasťou je takisto návod na nasadenie a jednoduché testovanie s popísanými výsledkami.Simplifying and unifying approach to some problems in computer science is the goal of any solution framework. In the thesis I tried using available methods and ways of usage to cover the requirements of the assignment to profit for as easy as possible extensible solutions. Realising of the concept of digital image processing and state of assignment on this requirement formed a specific usage of the entire project. Diploma thesis is gradually going through various stages of development from clarification of the issues through selection of appropriate technologies to the solution, further describes the implemented units and the important details. It also includes instructions for simple deployment and testing of with described results.460 - Katedra informatikyvelmi dobř

Usage of antenna for detection of tree falls on overhead lines with covered conductors

The direct contact of a tree or a branch of tree with Covered Conductors (CC) overhead lines causes Partial Discharges (PD) inside the insulation. The presence of PD degrades the insulation systems and eventually destroys insulation, which may lead to power delivery interruption. The detection and diagnosis of PD is an important tool to address the problem of tree caused faults in forested terrains. The PD occurs in the impulse component of the signal, which is usually measured by Rogowski coil (current signal) or single layer inductors (voltage signal). In this paper, we introduce a possibility to detect the tree caused faults with the usage of whip antenna. The advantage of the antenna is a very low price and the possibility to install antenna under voltage. The disadvantages are sensitivity to ferromagnetic materials and impossibility to distinguish affected phase. The measurements were carried out in the real environment in forested terrain in Jeseniky Mountains. The real environment is different from a laboratory conditions due to heavy noise (e.g. corona, radio emissions). This paper provides an examination of the background noise from the antenna signal. The experimental results indicate that the antenna may be successfully used instead of the current approach

Fault Detection for Covered Conductors With High-Frequency Voltage Signals: From Local Patterns to Global Features

The detection and characterization of partial discharge (PD) are crucial for the insulation diagnosis of overhead lines with covered conductors. With the release of a large dataset containing thousands of naturally obtained high-frequency voltage signals, data-driven analysis of fault-related PD patterns on an unprecedented scale becomes viable. The high diversity of PD patterns and background noise interferences motivates us to design an innovative pulse shape characterization method based on clustering techniques, which can dynamically identify a set of representative PD-related pulses. Capitalizing on those pulses as referential patterns, we construct insightful features and develop a novel machine learning model with a superior detection performance for early-stage covered conductor faults. The presented model outperforms the winning model in a Kaggle competition and provides the state-of-the-art solution to detect real-time disturbances in the field.Comment: To be published in IEEE Transactions on Smart Gri

ПОРІВНЯЛЬНА ХАРАКТЕРИСТИКА ДЕЯКИХ МЕТОДІВ ВИДІЛЕННЯ ЗБУДНИКІВ ҐРУНТОВИХ ІНФЕКЦІЙ

In the spread of infectious diseases important value belongs to environment that surrounds animals, meaning second link of epizootic chain (transmission factors). It is known that from sick animals, a large amount of microorganisms, which depends on the ways of spreading into environment, link to contamination of facilities, premises for animal care, soil, water and so on.The paper shows comparative data on the performance of specific laboratory methods used to allocate from the soil pathogens three types of spore infections (Cl. Chauvoei, Cl. Perfringens and Bas. Anthracis).For comparative evaluation methods of soil preparation for bacteriological research for the purpose of allocation of the above pathogens, using sterile and non-sterile soil samples, – growth medium – meat – peptone broth and agar, Kitt – Tarotstsi, blood glucose meat – agar and peptone various concentrations of test – strains of spores in the soil (100 thousand / d, 10 thousand / g, 1 thousand / g and 0.1 thousand / g).In the first experiment to 1 g sample of soil was added 10 cm3 of 0,85 % solution of sodium chloride (dilution 1:10), in the second experiment to soil sample 50 g was added to 50 cm3 distilled water (dilution 1: 1), the third experiment, proposed by us, to 10 g of soil was added 50 cm3 distilled water (dilution 1: 5).Comparing received positive results of research to highlight soil pathogens as infections from non-sterile and sterile soil samples from all growth medium at a specified concentration of spores in 1 g, they were in the first experiment – 23,3 %, the second 30 % and 46,7 % in the third.В распространении инфекционных болезней важное значение принадлежит объектам окружающей среды, которые окружают животных, то есть во втором звене эпизоотической цепи (фактороми передачи). Известно, что от больных животных выделяется большое количество микроорганизмов, которые в зависимости от путей выделения во внешнюю среду, контаминируют помещения, средства ухода за животными, почву, воду и тому подобное.В работе приведены сравнительные данные об эффективности отдельных лабораторных методов, используемых с целью выделения из почвы возбудителей трех споровых инфекций (Cl. chauvoei, Cl. perfringens та Bас. anthracіs).Для сравнительной оценки методов подготовки почвы для бактериологического исследования с целью выделения указанных выше возбудителей инфекций, использовали стерильные и нестерильные образцы почвы, питательные среды – мясо – пептонный бульон и агар, Китт – Тароцци, кровяное глюкозный мясо – пептонный агар и различных концентраций тест - штаммы спор в почве (100 тыс/г, 10 ты /г, 1 тыс /г и 0,1 тыс/г).В первом опыте до 1 г исследуемого образца почвы добавляли 10 см3 0,85 % раствора натрия хлорида (разведение 1:10), во втором опыте до навески почвы 50 г добавляли 50 см3 дистиллированной воды (разведение 1:1), в третьем опыте, предложенного нами, до 10 г почвы доливали 50 см3 дистиллированной воды (разведение 1:5).Сравнивая, полученные ниже, положительные результаты исследований с целью выделения возбудителей грунтовых инфекций, как с нестерильного, так и со стерильного образцов грунта на всех питательных средах при указанной концентрации спор в 1 г, они составляли в первом опыте – 23,3 %, во втором 30 % и в третьем 46,7 %.У поширенні інфекційних хвороб важливе значення належить об’єктам довкілля, які оточують тварин, тобто другій ланці епізоотичного ланцюга (факторам передачі). Відомо, що від хворих тварин виділяється велика кількість мікроорганізмів, які в залежності від шляхів виділення у зовнішнє середовище, контамінують приміщення, засоби догляду за тваринами, ґрунт, воду тощо.В роботі наведені порівняльні дані про ефективність окремих лабораторних методів, що використовуються з метою виділення з грунту збудників трьох спорових інфекцій (Cl. chauvoei, Cl. perfringens та Bас. anthracіs).Для порівняльної оцінки методів підготовки грунту для бактеріологічного дослідження з метою виділення наведених вище збудників інфекцій, використовували стерильні і нестерильні зразки грунту, поживні середовища – м'ясо – пептонний бульйон і агар, Кітт – Тароцці, кров’яний глюкозний м'ясо – пептонний агар та різних концентрацій тест – штами спор у грунті (100 тис/г, 10 тис/г, 1 тис/г та 0,1 тис/г).У першому досліді до 1 г досліджуваного зразка грунту додавали 10 см3 0,85 % -го розчину натрію хлориду (розведення 1:10), у другому досліді до наважки грунту 50 г додавали 50 см3 дистильованої води (розведення 1:1), у третьому досліді, запропонованого нами, до 10 г грунту доливали 50 см3 дистильованої води (розведення 1:5).Порівнюючи, отримані нижче, позитивні результати досліджень з метою виділення збудників грунтових інфекцій як з нестерильного, так і з стерильного зразків грунту на всіх живильних середовищах за вказаної концентрації спор в 1 г, вони становили у першому досліді – 23,3 %, у другому 30 % і у третьому 46,7 %