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| G1 |
N. Mišković (Fakultet elektrotehnike i računarstva, Zagreb, Croatia), Đ. Nađ, Z. Vukić (University of Zagreb, Faculty of Electrical Engineering and Computing, Zagreb, Croatia)
Guidance of Laboratory Marine Platforms 
Marine robotics is an interesting area for control engineers since these systems are complex, nonlinear and operate in highly unpredictable environment (winds, currents, waves). This paper present a laboratory model of a surface platform for dynamic positioning which has been developed at the Laboratory for Underwater Systems and Technologies, University of Zagreb. The full mathematical model consisting of actuator allocation, dynamic model and kinematic model is described. The platform has primarily been developed for testing and comparison of different control, guidance and navigation algorithms. The platform is overactuated which makes it suitable for fault tolerant control design. The paper describes the procedure of model based line following controller design which ensures stability and zero error line following under the influence of external disturbances.
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Z. Eškinja, I. Mišković, M. Stipanov (Brodarski Institut, Zagreb, Croatia)
Disturbance Recorder
Very important information in modern industries is process data recorded just before system breakdown. These are being used for resolving system failure cause and error reoccurrence prevention. Safety backup implementation into PLC systems is limited due to low memory and similar performance issues. The paper presents a method for compressing and recording process data using a PLC and an operator panel. The main advantage is placing important information on secure location: external memory card and remote station with Ethernet connection. The system is designed and tested for safety stop sequence in hydro plant turbine governance.
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D. Miljković (Hrvatska elektroprivreda d.d., Zagreb, Croatia)
REVIEW OF NOVELTY DETECTION METHODS
Novelty detection is the identification of new or unknown data or signals that a machine learning system is not aware of during training. Novelty detection methods try to identify outliers that differ from the distribution of ordinary data. Paper reviews methods and current state of research in this field with practical applications.
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D. Miljković (Hrvatska elektroprivreda d.d., Zagreb, Croatia)
BANK OF ADAPTIVE FILTERS FOR FAULT DETECTION IN MULTIPLE REGIME PROCESS USING UNSUPERVISED TRAINING
Change detection is kind of adaptive filtering for non-stationary signals, and is the tool in fault detection and diagnosis. In this paper bank of adaptive filter is used for fault detection in multiple regime process. Bank of filters is trained by proposed unsupervised method.
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M. Špundak (Vipnet usluge d.o.o., Zagreb, Croatia), N. Bogunović, K. Fertalj (Sveučilište u Zagrebu, Fakultet elektrotehnike i računarstva, Zagreb, Croatia)
Web Shop User Error Detection Based on Rule Based Expert System
Rule based systems became popular during the 1980s and since then have been recognized as the best solution for sustainable and maintainable applications. This article provides the overview of the architecture and basic characteristics of the forward chaining and backward chaining rule based systems. It also tries to establish basic steps in development and maintenance of such systems, as well as it discusses major shortcomings of the rule based systems. At the end, example has been given of forward chaining rule based system used for user error detection at the web shop application.
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| G2 |
I. Grudenic (Fakultet elektrotehnike i računarstva, Zagreb, Croatia), I. Bakarcic (In Cubis d.o.o., Rijeka, Croatia), N. Bogunovic (Fakultet elektrotehnike i računarstva, Zagreb, Croatia)
Computer Cluster Workload Analysis
Performance of computers clusters is greatly affected by a nature of the submitted workload. Early characterization of different workload types allows for scheduler fine tuning as well as predictions on the system load. Statistical analysis and visual representation of the workload data provide valuable insight to the overall system utilization and may reveal potential bottlenecks and points for improvement.
In this paper we describe most important cluster job features and introduce a tool for statistical analysis and manipulation of the workload data.
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J. Balen, G. Martinović, S. Rimac-Drlje (Elektrotehnički fakultet Osijek, Osijek, Croatia)
Measuring the Performance Impact of Main Operating Systems on Virtual Machine
Operating systems virtualization enables installation and running of multiple virtual operating systems on the same computer system. Operating system that communicates directly with hardware is known as the main operating system whereas the virtual operating systems have all the features of a real operating system, but run inside the main operating system. Virtual machine is separated from the computer hardware resources and the main operating system simulates the hardware work. Performance of virtual operating systems that run on the same hardware depend on the performance of the main operating system. In this paper we study the impact of the performance of the main operating system on virtual machine performance. Windows XP, Windows Vista and Windows 7 are used as the main operating systems while using Windows Vista as a virtual operating system. Performance measurement of the virtual operating system is done in the same controlled conditions for all three main operating systems using benchmark applications. Performance measurement results show that the virtual operating system has the best performance when Windows 7 is used as the main operating system.
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D. Ivošević (Fakultet elektrotehnike i računarstva, Zagreb, Croatia), D. Ivošević, V. Sruk (FER, Zagreb, Croatia)
Evaluation of Embedded Processor Based BDD Implementations
Today's different strategies for implementation of computationally intensive applications in hardware are avaliable. The spectrum of implementations ranges from usage of standardized microprocessors to specially tailored hardware solutions. Available processors architectures range from general purpose type through processors with instruction sets extensions to application-specific processors. On the other side, recent advances in design automation resulted with development of C-to-hardware compilers as a new strategy for application’s hardware implementation.
In this paper, we present and elaborate characteristics of hardware implementations of Binary Decision Diagrams (BDDs) application, used in many research and development areas, and especially in formal verification and Computer-Aided Design (CAD) tools. For this application, processor architecture using C-to-hardware NISC toolset is manually tailored and compared with implementation approaches based on standard soft and hard processors. All these approaches are implemented and verified using FPGA Virtex-5 development board. Our results show that, besides code and compiler side optimizations, more significant improvements in total execution cycles count can be achieved when processor architecture side optimizations are included.
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V. Zadrija (Sveučilište u Zagrebu, Fakultet elektrotehnike i računarstva, Zagreb, Croatia), V. Sruk (Faculty of Electrical Engineering and Computing, University of Zagreb, Zagreb, Croatia)
Mapping algorithms for MPSoC synthesis
With ever increasing complexity of modern embedded systems, Multiprocessor Systems on Chip have emerged as a tradeoff solution between traditional general purpose processor or DSP design, and implementation in custom hardware. Such systems are usually comprised out of various processing elements and their synthesis includes various partitioning, mapping and scheduling strategies with goal to optimize multiple constraints. Moreover, shorten time to market and rising software complexity calls for synthesis automation. Transaction Level Model (TLM) has arisen as the next level of abstraction for MPSoC synthesis because it enables high-speed synthesis and adequate accuracy. In this paper, we give an overview of mapping algorithms for MPSoC synthesis. As a case study, we evaluated described algorithms on a MPSoC platform using applications described as task graphs. As a quality measure, system performance is employed and results are discussed accordingly.
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B. Mrazovac, N. Teslic (Faculty of technical sciences, Novi Sad, Serbia)
An optimized software solution for parallel video decoding in Digital TV sets
This paper presents one approach in software realization of Picture-in-Picture decoder (PIP decoder). Advantage of introduced PIP decoder is that it can be easily integrated into systems which do not have hardware support for Picture-in-Picture functionality. Those systems are usually based only on one low processing power hardware decoder, which is in charge of decoding and displaying current video stream. If it is required to simultaneously decode two different video streams, one such decoder is not enough. Cheap and simple solution is to use presented PIP decoder which separately decodes and displays another video stream, allowing in that way parallel visualization of two video streams. PIP decoder utilizes modified MPEG-2 decoding algorithm, which decodes and displays only certain frames (I-frames) and their elements (DC components per each block of pixels). DC components of each I-frame are collected to create picture. Described approach to PIP decoder realization follows the inability of the target system to use the conventional MPEG-2 decoding algorithm, according the restrictions of the system resources to work in real time.
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| G3 |
E. Skejić (University of Tuzla, TUZLA, Bosnia and Herzegovina), O. Džindo (Comnet d.o.o. Tuzla, Tuzla, Bosnia and Herzegovina), D. Demirović (Faculty of Electrical Engineering, University of Tuzla, Tuzla, Bosnia and Herzegovina)
Virtualization of Hardware Resources as a Method of Power Savings in Data Center
An excessive power consumption characterizes all industries, even IT.
Today, different methods of energy savings are in use, due to the
pollution of the environment and the greenhouse effect. One of the
newest methods in the IT is green IT that is directly connected with
the virtualization of hardware resources. This study illustrates the
procedure of hardware virtualization using real-world example and the
analyses of the results in power consumption before and after the
virtualization.
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S. Nikolovski (Elektrotehnički fakultet u Osijeku, Zagreb, Croatia), Z. Klaic, Z. Kraus (Faculty of electrical engineering, Osijek, Croatia), M. Stojkov (Faculty of Mechanical engineering, Slavonski Brod, Croatia)
Computation and measurement of electromagnetic fields in high voltage transformer stations
This paper presents computations and measurements of the electric and magnetic fields insid eand outside the transformer stations produced by busbars, transformers and transmission line structures at different HV transmission stations TS 400/110 kV, TS 110/10 kV and TS 35/10 kV The fundamental sources of low frequency electromagnetic fields in the transformer stations are the primary elements of the 400, 110 and 35 kV open substations as well as connected 400, 110 and 35 kV overhead lines and cables. Due to the complexity of the geometry of the substation elements, it was necessary to apply a three-dimensional approach to the computation and analysis of the electromagnetic field. Computations of electromagnetic fields were conducted for quasi-static states of electrical values at a power frequency of 50 Hz. EMF were compared for these three HV substations, 2D and 3D spatial distribution of EMF were presented and compared with permissible standard levels according to HRN norm.
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G. Knežević (ELEKTROTEHNIČKI FAKULTET OSIJEK, OSIJEK, Croatia), K. Fekete, S. Nikolovski (ETF Osijek, Osijek, Croatia)
Applying Agent-based Modeling to Electricity Market Simulation
The traditional electric companies that operated as a regulated monopoly that controlled all aspects of electricity service are changed. They are separated in those for generation, transmission and distribution. Demanding companies, ISO (Independent system operator), regulator are new companies which enable function of restructured electricity market. That form of market where multiple companies are competing to provide the different services is called deregulated electricity market.
In terms of understanding electricity market function, relations among market participants and problems that can occur in deregulated markets, it is necessary to model and simulate electricity market. One of the modeling and simulation methods is agent-based method. EMCAS (Electricity Market Complex Adaptive System) is computer program that enables agent-based modeling and simulation. Agent-based means that every market participant is represented as independent agent with its own strategy and decision-making. Agents also have abilities of learning and adapting.
This paper point up possibility of appliance agent-based modeling and simulation to future Croatian electricity market. The created computer model is being used to simulate two scenarios: cross-border energy transactions and price-probing strategy of Generation company. Influence of cross-border transaction and price probing strategies on electricity price in possible Croatian electricity market model is shown.
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F. Vrbancic (Franc Vrbančič, Ptuj, Slovenia)
The ubiquitous RFID technology used for livestock breeding
The article focuses on integrating RFID technology into the process of livestock breeding. Our proposition comprises two distinctive constitutional blocks, the first takes case of identifying RFID tags and is implemented primarily in hardware, whereas the second one runs in software on a personal computer and consists of SQL database for data manipulation as well as associated user interface. A complete implementation of the system is described together with rationales for parts selection and schematics. Potential customers satisfaction and costs savings more than justify integration of our proposition into the process of livestock breeding.
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| Lunch break |
| Invited Lecture |
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Alojz Slutej (ABB, Västerås, Sweden)
Advances in Sensors and Control Automation Technology...
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| G4 |
Ž. Hocenski (Elektrotehnički fakultet Sveučilišta u Osijeku, Osijek, Croatia), I. Aleksi, Ž. Hocenski, P. Horvat (Elektrotehnički fakultet osijek, Osijek, Croatia)
Acoustic Localization based on FPGA
Acoustic localization device based on FPGA is presented in this paper. It is based on a FPGA multichannel signal processing module that is connected to a sound detector array. Sound detector is made by microphones and cascade analog amplifiers. Detector also includes Schmitt trigger that generates a true/false logic signal in correspondence to availability of sound waves in surrounding area. Each microphone was assigned predetermined sound wave direction detecting area. Finite state machine is implemented in FPGA in order to detect a direction of a sound wave. One drawback to this method is that the analog circuits should be set equally among channels. Discussion is done on how to equalize multi-channel analog components that are used for sound localization device. Applicability of such devices may be in tracking some sound-active object (animals, wounded peoples) in an environment with reduced visibility (fog, forest, muddy water).
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T. Petrinić (HEP - ODS d.o.o., Elektroprimorje Rijeka, Pogon Cres-Lošinj, Mali Lošinj, Croatia), I. Petrović (Fakultet elektrotehnike i računarstva, Zagreb, Croatia)
Upravljanje neholonomskim mobilnim robotima s diferencijalnim pogonom
U radu su razvijeni kinematički i dinamički modeli neholonomskih mobilnih robota s diferencijalnim pogonom i predložen je algoritam upravljanja kretanjem koji osigurava slijeđenje zadane trajektorije mobilnog robota s minimalnim utroškom energije. Razvijeni modeli i algoritam upravljanja provjereni su simulacijma na primjeru mobilnog robota Pioneer 3DX tvrtke MobileRobotics Inc.
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M. Baotić (Fakultet elektrotehnike i računarstva, Zagreb, Croatia), V. Petrović, N. Hure, M. Baotić (FER, Zagreb, Croatia)
Primjena LabVIEW programskog alata za razvoj HIL strukture upravljanja brzinom vrtnje vjetroagregata
U radu je opisana primjena LabVIEW programskog alata za razvoj Hardware-In-the-Loop strukture upravljanja brzinom vrtnje vjetroagregata. Klasični algoritmi upravljanja vjetroagregatom zasnivaju se na upravljanju brzinom vrtnje vjetroagregata. Pritom se razlikuju dva različita radna područja u kojima se vjetroagregat može nalaziti: 1) područje slabih vjetrova u kojem je važno maksimalno iskoristiti raspoloživu energiju vjetra; u ovom području rada lopatice vjetroagregata miruju i postavljene su na kut koji osigurava optimalnu pretvorbu energije, dok se elektromehanički moment generatora može postavljati prema preglednoj tablici u ovisnosti o brzini vrtnje; i 2) područje jakih vjetrova u kojem je snaga vjetra prevelika i potrebno je ograničiti energiju koja se preuzima iz vjetra. Razvijena struktura upravljanja je provjerena na vjetroagregatu koji je dio Laboratorija za obnovljive izvore energije na Fakultetu elektrotehnike i računarstva Sveučilišta u Zagrebu.
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| Break |
| G5 |
M. Baotić (Fakultet elektrotehnike i računarstva, Zagreb, Croatia), V. Spudić, M. Jelavić, M. Baotić (FER, Zagreb, Croatia)
Simulator vjetroelektrane u Matlab programskom okruženju
Vjetroelektranu čini skupina vjetroagregata raspoređenih na određenoj lokaciji. Svaki vjetroagregat kinetičku energiju vjetra pretvara prvo u mehaničku energiju vrtnje rotora a potom, posredstvom električnog generatora, u električnu energiju. Za modeliranje rada cjelokupne vjetroelektrane potrebno je simulirati promjene brzina vjetra na pojedinim vjetroagregatima koji predstavljaju vjernu sliku fizikalnih pojava. Vjetar je stoga modeliran kao skup stohastičkih signala - brzina vjetra na pojedinim vjetroturbinama - za koje su poznate: spektralna razdioba snage vremenskog signala u pojedinim točkama prostora i prostorna korelacije između signala u različitim točkama prostora. Dodatno je uzeto u obzir da je zakretni moment rotora vjetroturbine, općenito, uzrokovan (nejednakim) vertikalnim profilom brzina vjetra. Simulator vjetroelektrane je realiziran u Matlab programskom okruženju. Pritom je pretpostavljeno da su vjetroagregati upravljani zakretom lopatica i promjenjivim momentom generatora, kao što je slučaj sa postojećim vjetroagregatom koji je dio Laboratorija za obnovljive izvore energije na Fakultetu elektrotehnike i računarstva Sveučilišta u Zagrebu.
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S. Kezić (Grad d.o.o., Pula, Croatia), M. Žagar (Faculty of electrical engineering and computing, University of Zagreb, Zagreb, Croatia)
Interpolation Method for Spatial Determination and „on Board“ Time Values Visualization of Recurring Events in Moving Systems
Most current on board systems for determination of repetitive event of bypassing moving system through physical space line are usually including tatical and event sensoring subsystem, attached to the moving assessable system. With the GPS technology and processing of multidimensional data, it is possible to determine „drive through“ event by using numerical analysis, interpolation methods. This approach calculates the observable time value result of the event. Information is collected with serial protocol, and stored on the system processing in real time, which further allows future use in analyzing and comparing of the obtained values. The processing system is based on a soft real-time platform, and also allows visualization of the actual values of interest, directly on the mobile system in the working environment during runtime. In order to improve the accuracy of the system it is possible to use the multiple sampling sensors in combination with improved method of interpolation.
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J. Matusko (, , ), M. Boras, V. Lešić, J. Matuško (FER, Zagreb, Croatia), F. Kolonić (Fakultet elektrotehnike i računarstva, Zagreb, Croatia)
B-spline neuronski kompenzator nelinearnosti sustava
U ovom radu je pokazana realizacija on-line postupka učenja neuronskog kompenzatora projektiranog u svrhu kompenzacije utjecaja trenja u mehatroničkom sustavu krana s ovješenjim njihalom. Regulator se sastoji od dvije komponente 1) konvencionalnog linearnog regulatora po varijablama stanja sustava i 2) samoučećeg kompenzatora u unaprijednoj grani. Regulator po varijablama stanja projektiran je na temelju lineariziranog matematičkog modela sustava. Samoučeći kompenzator trenja u unaprijednoj grani zasniva se na B-spline neuronskoj mreži koja se sastoji od jednog skrivenog sloja B-spline funkcija drugog reda. Eksperimentalne provjere na laboratorijskom postavu pokazuju da korištenje B-spline neuronskog kompenzatora eliminira pogrešku u stacionarnom stanju uzrokovanu efektom trenja u sustavu.
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D. Žigman, D. Sabljić (Tehničko veleučilište u Zagrebu, Zagreb, Croatia)
Modularno integrirani web sustav sljedeće generacije
Rad se bavi problematikom web sustava kakvi postoje danas, navodeći njihove prednosti i mane. Definiraju se zahtjevi kojima bi trebao udovoljavati web sustav sljedeće generacije kako bi najviše služio što širem broju korisnika i poduzeća koja ne mogu uložiti u potpuna "in-house" rješenja. Jedno od mogućih rješenja je prezentirano na konceptualnoj i tehničkoj razini. Za takav koncept je dan primjer razvoja komponente koristeći ASP.Net, C# i Javascript/jQuery tehnologije, uvažavajući prioritet da takva komponenta bude djeljiva između svih aplikacija sustava. Da bude optimizirana pri dohvatu, obradi i transportu podataka i da pruža interakciju usporedivu s desktop aplikacijama.
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D. Maršić (Tehničko veleučilište u Zagrebu, Zagreb, Croatia), G. Malčić (Tehničko veleučilište u Zagrebu-Elektrotehnički odjel, Zagreb, Croatia), D. Pažameta (PA-EL d.o.o., Dubrovčan, Veliko Trgovišće, Croatia)
Prikupljanje i integracija podataka SCADA sustava pomoću programske podrške FactoryTalk
Današnja industrijska proizvodnja temelji se na složenim automatiziranim postrojenjima gdje se u mnogim poduzećima često susrećemo s različitim upravljačkim i informatičkim sustavima, a informacije se zbog nepovezanosti tih sustava ne objedinjuju.
U postrojenjima koja su ishod ovakvog pristupa ipak se s vremenom nameće zahtjev za objedinjavanje svih tehnoloških komponenti u jedinstven informacijski sustav poduzeća uz mogućnost rada sa svim podacima iz sustava.
Kao odgovor na ove zahtjeve predstavljen je koncept upravljačkog i informacijskog sustava koji objedinjenje komponente od pogonske do poslovne razine uz mogućnost praćenja i spremanja svih relevantnih podataka. U ovom radu je predstavljen jedan takav koncept tvrtke Rockwell Automation čiji je rad testiran u laboratorijskim uvjetima.
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D. Maršić (Tehničko veleučilište u Zagrebu, Zagreb, Croatia), M. Fruk, G. Malčić (Tehničko veleučilište u Zagrebu - Elektrotehnički odjel, Zagreb, Croatia)
Upotreba PLC uređaja za mjerenje brzine vrtnje
Nužan uvjet za funkcioniranje modernih industrijskih pogona je kvalitetno mjerenje brzine vrtnje elektromotornih i ostalih rotacionih pogona. Zahtjevi za povećanim brojem proizvoda u jedinici vremena indirektno su dovele do razvoja senzorske i računalne opreme koja može odgovoriti takovim zadacima.
Upotrebom inkrementalnih enkodera kao osnovnih elemenata za zahtjevnije mjerenje brzine rotacionog gibanja, logično je bilo povećanje broja izlaznih impulsa takvog mjernog uređaja.
Računala koja primaju impulsnu mjernu informaciju moraju je prikazati i obraditi u okviru vremena koje postavlja brzina procesa. U ovom radu obrađeno je mjerenje brzine rotacionog gibanja pomoću PLC računala serije S7 300 opremljenog s potrebnim sklopovljem u laboratorijskim uvjetima rada.
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B. Brestovec (KONČAR - KET d.d., 10 000 Zagreb, Croatia), D. Pažameta (PA-EL d.o.o., 49214 Veliko Trgovišće, Croatia), D. Roketinec (PLINACRO d.o.o., 10000 Zagreb, Croatia)
Sustav daljinskog nadzora i upravljanja katodnom zaštitom na plinovodima
Korozija metalnih objekata uronjenih u tlo spori je i dugotrajan proces, koji ipak ima velike posljedice na trošenje materijala plinovoda te na kraju puknuća te neželjenog i nekontroliranog curenja plina. Kako bi se efikasnije nadzirao rad sustava katodne zaštite koji štiti plinovod sve veća je tendencija ugradnje uređaja za daljinski nadzor i upravljanje.
Sustav daljinskog nadzora i upravljanja uređajima katodne zaštite omogućuju trenutni uvid u stanje cjelokupnog sustava katodne zaštite te omogućuje upravljanje i promjenu radnih parametara kako bi se optimirao sustav zaštite plinovoda. Uređaji za daljinsku dojavu šalju podatke o uređajima na udaljenim lokacijama u centralni poslužitelj koji obrađuje i pohranjuje podatke u arhivu. Svi podaci u arhivi dostupni su za detaljnu analizu i obradu operatera putem klijenata koji se definiraju i specificiraju ovisno o posebnim zahtjevima projekta, u ovom slučaju katodne zaštite. Operater, specijalist katodne zaštite, može iz centralnog radnog mjesta mijenjati parametre rada pojedinih uređaja katodne zaštite ovisno o novonastalim uvjetima na terenu.
U referatu je opisan sustav isporučen za Operatora plinskog transportnog sustava PLINACRO. Sustav daljinskog nadzora i upravljanja katodnom zaštitom temelji se na SCADA sustavu PROZANET koji je u potpunosti razvijen i integriran u KONČAR Inženjeringu za energetiku i transport d.d.
Sustav se sastoji od centralnog poslužitelja podataka na kojem je instalirana jedinstvena baza podataka bazirana na Microsoft SQL Server 2008 SE bazi podataka, a sve bazirano na operacionom sustavu Windows Server 2008. Komunikacijsko sučelje, FEP, omogućuju komunikaciju sa uređajima daljinske dojave po standardnim protokolima IEC 60870-5-104 i MODBUS TCP. Komunikacija sa uređajima za daljinsku dojavu odvija se preko optičkog LAN-a ukoliko se uređaji nalaze na novo izgrađenim objektima na kojima postoji optika, ili preko bežičnog prijenosa putem GPRS-a na starim objektima na kojima nema optičke infrastrukture.
Ovakav Sustav daljinskog nadzora i upravljanja omogućuje praćenje rada sustava zaštite plinovoda od korozije u stvarnom vremenu i sa jednog centralnog mjesta gdje se pohranjuju podaci sa svih objekata katodne zaštite. Na taj način se brzo i učinkovito mogu otkriti promjene u okolini koje mogu utjecati na pojačano korozijsko trošenje plinovoda. Putem sustava moguće je daljinski izdavati komande koje će omogućiti daljinskim uređajima postavljanje novih vrijednosti po kojima se upravlja sustavom katodne zaštite plinovoda.
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V. Tasić (Institut za rudarstvo i metalurgiju Bor, Bor, Serbia), D. Milivojević, M. Pavlov (Institut za rudarstvo i metalrugiju Bor, Bor, Serbia), V. Despotović (Tehnički fakultet Bor, Bor, Serbia)
Reducing the costs of electricity in the Copper Mining and Smelting Complex RTB Bor (Serbia) by using of the distributed control system
Abstract - Monitoring and managing consumption of electricity for large consumers, such as Copper Mining and Smelting Complex RTB Bor, requires synchronized and timely action in all production units. First of all, it is necessary to achieve an effective exchange of information between the production units and control centers. In order to implement timely impact on the reduction of peak power at the consumer substation is necessary response time of several minutes. Such as control systems can be classified in the class of soft real time systems. The fact is that for large customers reduce of peak power on a monthly basis from only 1% is reflected in savings in the amount of several thousand euros. This data describes the sufficient justification of the need for existence and proper functioning of these control systems. The paper presents results of development and implementation of our own solutions for distributed systems management of electricity consumption, both at the plant level and in each of the individual production units. Particular attention was paid to presentation of the software solutions, as well as on achievements in practical implementation.
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P. Crnošija (, , ), T. Nagy (Faculty of Transport and Traffic Science, Zagreb, Croatia), T. Bjažić (Faculty of Electrical Engineering and Computing, Zagreb, Croatia), M. Fruk, D. Maršić (Polytechnic of Zagreb, Zagreb, Croatia)
Design of Thermal Process Controller by Using Bode Plots of Open Loop Frequency Characteristics
The literature, dealing with automatic control systems, describes the application of Bode plots of open loop frequency characteristics to the controller parameter synthesis as the trial and error method. The procedure suggested is the one for controller parameter determining according to the given phase margin of the open system frequency characteristics. The procedure is repeated until the required closed loop response overshoot determined by means of the computer simulation is achieved.
This paper describes the application of Bode plots of open loop frequency characteristics to the controller parameter synthesis with respect to the given closed loop system response overshoot where controller parameters are determined by one iteration procedure only. In order to make the synthesis of PI controller parameters, approximate relationships for determination phase margin from the given closed loop response overshoot are used while compensating the biggest time constant and symmetric frequency characteristics.
Bode plots of open loop frequency characteristics is applied to the controller parameter synthesis of thermal process controller by compensating the biggest time constant and symmetric frequency characteristics as well as different values of the given closed system response overshoot. A smaller correction of controller gain coefficient in order to achieve given closed system response overshoot was carried out by computer simulation.
This paper gives closed loop system responses with regard to reference and disturbance value obtained by means of the computer simulation.
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Basic information:
Chairs:
Nikola Bogunović (Croatia), Jadranko F. Novak (Croatia), Ivan Petrović (Croatia), Joško Radej (Croatia)
Steering Committee:
Matjaž Colnarič (Slovenia), Željko Hocenski (Croatia), Niko Guid (Slovenia)
International Program Committee Chairman:
Petar Biljanović (Croatia)
International Program Committe:
Alberto Abello Gamazo (Spain), Slavko Amon (Slovenia), Michael E. Auer (Austria), Mirta Baranović (Croatia), Ladjel Bellatreche (France), Nikola Bogunović (Croatia), Peter Brezany (Austria), Željko Butković (Croatia), Željka Car (Croatia), Matjaž Colnarič (Slovenia), Alfredo Cuzzocrea (Italy), Marina Čičin-Šain (Croatia), Dragan Čišić (Croatia), Todd Eavis (Canada), Maurizio Ferrari (Italy), Jasna Glavaš (Croatia), Matteo Golfarelli (Italy), Stjepan Golubić (Croatia), Francesco Gregoretti (Italy), Niko Guid (Slovenia), Yike Guo (United Kingdom), Ladislav Hluchy (Slovakia), Vlasta Hudek (Croatia), Željko Hutinski (Croatia), Mile Ivanda (Croatia), Robert Jones (Switzerland), Peter Kacsuk (Hungary), Aneta Karaivanova (Bulgaria), Miroslav Karasek (Czech Republic), Bernhard Katzy (Germany), Christian Kittl (Austria), Miljenko Krvišek (Croatia), Mladen Mauher (Croatia), Branko Mikac (Croatia), A. Min Tjoa (Austria), Jadranko F. Novak (Croatia), Jesus Pardillo (Spain), Nikola Pavešić (Slovenia), Ivan Petrović (Croatia), Radivoje S. Popović (Switzerland), Ognjen Prnjat (Greece), Slobodan Ribarić (Croatia), Karolj Skala (Croatia), Ivanka Sluganović (Croatia), Vanja Smokvina (Croatia), Ninoslav Stojadinović (Serbia), Aleksandar Szabo (Croatia), Laszlo Szirmay-Kalos (Hungary), Jadranka Šunde (Australia), Antonio Teixeira (Portugal), Roman Trobec (Slovenia), Ivana Turčić Prstačić (Croatia), Walter Ukovich (Italy), Mirko Varga (Croatia), Boris Vrdoljak (Croatia), Dalibor Vrsalović (Croatia), Robert Wrembel (Poland), Baldomir Zajc (Slovenia)
Scope:
The scope of the conference includes, but is not limited to:
- Information Technology in Industrial and Factory Automation
- Industrial and Factory Communication Systems
- Real -Time Systems
- Distributed Embedded Systems
- Web Based Systems
- Automated Manufacturing Systems and Development Methodology
- Industrial Robots and Manipulators
- Manufacturing Optimization
- Visualization in Scientific and Engineering Computing
- Automation Systems and Control
- Information Security
- Information Technology in Enterprise Resource Planing (ERP)
Official languages are English and Croatian.
Location:
Opatija, often called the Nice of the Adriatic, is one of the most popular tourist resorts in Croatia and a place with the longest tourist tradition on the eastern part of Adriatic coast. Opatija is so attractive that at the end of the 19th and beginning of the 20th centuries it was visited by the most prominent personalities: Giacomo Puccini, Pietro Mascagni, A. P. Čehov, James Joyce, Isidora Duncan, Beniamino Gigli, Primo Carnera, Emperor Franz Joseph, German Emperor Wilhelm II, Swedish Royal Couple Oscar and Sophia, King George of Greece.
The offer includes 20-odd hotels, a large number of catering establishments, sports and recreational facilities.
For more details please look at www.opatija.hr/ and www.opatija-tourism.hr/.
Registration / Fees:
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REGISTRATION / FEES
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Price in EUR
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Before May 09, 2011
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After May 09, 2011
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| Members of MIPRO and IEEE |
180
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200
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| Students (undergraduate), primary and secondary school teachers |
100
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110
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| Others |
200
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220
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Contact:
Nikola Bogunović
Faculty of Electrical Engineering and Computing
Unska 3
HR-10000 Zagreb, Croatia
Phone: +385 1 612 95 02
Fax: +385 1 612 96 53
E-mail: nikola.bogunović@fer.hr
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