http://www.ifac-papersonline.net/ en Copyright 09:05 AM Wednesday 08, 2012 IFAC-PapersOnline http://www.ifacpapersonline.com 09:05 AM Wednesday 08, 2012 09:05 AM Wednesday 08, 2012 ET webmaster@ifac-papersonline.net webmaster@ifac-papersonline.net http://www.ifac-papersonline.net/Detailed/39501.html 04:00 PM Wednesday 31, 1969 This paper presents the principles of a Home Automation System dedicated to power management that adapts power consumption to available power ressources according to inhabitant comfort and cost criteria. The system relies on a multiagent paradigm. Each agent supports a service achieved by several devices, it cooperates and coordinates its action with others in order to find an acceptable near-optimal solution. The control algorithm is decomposed into two complementary mechanisms: a reactive mechanism, which protects from constraint violations, and an anticipation mechanism, which computes a plan for global consumption according to predicted productions and consumptions and to inhabitant criteria. The paper shows how to compute a global consumption plan relying on Bellman-Ford's algorithm and how to reduce the problem complexity by dividing the whole problem into independent sub-problems. http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif http://www.ifac-papersonline.net/Detailed/39536.html 04:00 PM Wednesday 31, 1969 In this paper a possible extension and the use of Taylor series for the numerical modelling and simulation of some processes which can be described in terms of second order partial derivative equations which depend on four independent variable is developed (Bellomo, and Preziosi, 1995; Farlow, 1982). One of these processes may be experienced in the field of pollutants dispersion. In power plants, stacks are usually not instrumented to measure pollutants emision, thus the available emission data is always very limited and often uncertain and imprecise. The mathematical models are developed to describe the air pollution dispersion from a power plant stack. http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif http://www.ifac-papersonline.net/Detailed/39504.html 04:00 PM Wednesday 31, 1969 The paper presents an adaptive system identification application using a Digital Signal Processor from Texas Instruments. The system to be identified is an automotive alternator. Experimental application illustrates the effectiveness and the simplicity of the proposed method. The application runs on a TMS320F2812 DSP. Once the desired functionality has been captured and simulated, using MATLAB/Simulink/Embedded Target for TI C2000 DSP environment can be generated code for the DSP. All task assignments to processor are automatically made by the software. Once the coefficients of a digital filter are calculated the mathematical model of the unknown system is determined. http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif http://www.ifac-papersonline.net/Detailed/39490.html 04:00 PM Wednesday 31, 1969 In this paper are presented some new concepts of control applied in Power Systems. Are given the architectures and methodologies based on the agents theory. The complexity of Power Systems is included into a new paradigm - Complex Adaptive Systems - and the modelling and Control of Power Systems based on intelligent agents are considered. Some concepts on hierarchical and heterarchical architectures which include different intelligent techniques are also presented in this paper. http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif http://www.ifac-papersonline.net/Detailed/39530.html 04:00 PM Wednesday 31, 1969 Early detection of a fault or damage at power plants is crucial for their control and maneuvering. In this paper, the author proposes a practical design method useful in the supervising of the system in presence of process faults. The fault detection and isolation (FDI) problem is an inherently complex one. The immediate goals is to preserve the stability of process and, if is possible, to control the process in a slightly degraded manner. http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif http://www.ifac-papersonline.net/Detailed/39523.html 04:00 PM Wednesday 31, 1969 In the SCADA system monitoring, control and over-limit alarm processes from the hydroelectric power plants cascade (on the Cris river) have been obtained a large amounts of historical data stored in a database. But in their preliminary form these data don't mean a performance management. Data mining techniques applied over historical acquired data are used to extract hidden management information directly from the SCADA system's database records. This paper presents a data mining framework for the historical data of an industrial measurement and control system and establishes a data mining flow. http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif http://www.ifac-papersonline.net/Detailed/39538.html 04:00 PM Wednesday 31, 1969 Our aim is to present the necessity and the objectives taken into account in the development of an ON LINE expert system, with free access, for the eolian sites designing process. The expert system is based on a set of rules and metric relations, and also on a Romanian patent. By eolian site design, we assume: 1. approximation of average and annual eolian potential, using terrain data, and 2. offering a blueprint for eolian plant project. This blueprint contains: potential technical solution, recommended installed power, optimal pillar height, approximation of capital costs, data about the providers for eolian plants, etc. http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif http://www.ifac-papersonline.net/Detailed/39524.html 04:00 PM Wednesday 31, 1969 In each hydroelectric power station, one of the outstanding systems is the power channel, which provides water flow to the hydroelectric power generators. On this power channel, there are two or more special valves that can interrupt the flow in specials conditions. In this specific application, there are two butterfly valves and the two command systems, placed together into a special underground room, called "valve house". The function of the each system is to allow the water flow reach the generators by keeping the valves opened (0 - 5 degrees) and to avoid the overflow of the underground power station in some cases. These two systems are conected by electrical signals, in order to increase safety in use by detecting malfunctions and to close at least one valve. http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif http://www.ifac-papersonline.net/Detailed/39514.html 04:00 PM Wednesday 31, 1969 Evolution and large scale spreading of the computational techniques allowed the design and realization of some acquisition, processing, storing and sending data taken from the process equipments to a superior level - dispatcher. In this way, it is presented a data acquisition equipment for energetic measures which is incorporated in a dispatching system aiming the monitoring and storing of electrical measures which are taken from electrical cells which compose the supervised electrical station. There is shown the system architecture underlining the taken signals, transducers used and the component elements of the system: Local data acquisition equipments (LDAqE), Local data acquisition equipments synchronization subsystem, Data communication subsystem and Processing, storing and data displaying subsystem. http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif http://www.ifac-papersonline.net/Detailed/39521.html 04:00 PM Wednesday 31, 1969 The papers presents a high performance speed and position control system for separately-excited D.C. motor, which was designed and performed with a dedicated integrated circuits (L290, L291, L292), made by SGS-THOMSON Microelectronics Company. The L290, L291 and L292 together form a complete microprocessor-controlled (microcomputer chips) DC motor servo positioning system that is both fast and accurate with an adequate software. The papers presents a description of the system, detailed function descriptions of each device and application information. http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif http://www.ifac-papersonline.net/Detailed/39528.html 04:00 PM Wednesday 31, 1969 A new distributed approach for monitoring the voltage events (sags and overvoltage) in electric power system is proposed. The distributed monitoring system is implemented on a set of microcontrollers connected to personal computers that are linked through Internet. The microcontrollers endowed with voltage transducers implement information agents that communicate to a software multiagent-agent system when voltage events occur. The users of the power system can get information about events occurred during a period of time. http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif http://www.ifac-papersonline.net/Detailed/39529.html 04:00 PM Wednesday 31, 1969 The classical Thermal Loop Test up to national standards of prophylactic measurement for high voltage rotating machinery was improved by the intermediate of thermo-graphic inspection with a last generation of INFRARED THERMOVISION CAMERA. The method generates thermo-graphic maps by intermediate of a dedicated software of the internal cylindrical surface of the magnetic core of the rotating machinery. The thermo-graphic maps are generated in strictly identical condition at the start of the generator, as well as at the major planned outages after 5, 10, 15, 20 years of functioning. The proposed method of testing allowed the users to compare the thermo-graphic maps and to put in evidence the "thermal hot spots" (respectively the magnetically failures) and their evolution in time and gives the users the possibility to establish the moment of partial or complete replacement of the iron core. http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif http://www.ifac-papersonline.net/Detailed/39497.html 04:00 PM Wednesday 31, 1969 The paper deals with the simulation and implementation of AC-drives with synchronous and induction motors fed by a local distribution DC-line, which is supplied from an autonomous vector controlled synchronous generator. The main AC-grid is connected to DC-line the via ecological power electronic converters with bi-directional power flow, like the AC-drives and the generator. Solutions are proposed for sine-wave rectifying and inverting of the energy accomplishing grid-side unity power-factor with active power-filtering of the AC-grid- and motor-side currents for different transferred energy levels. The energy-efficiency of the drives is achieved by means of vector control structures. http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif http://www.ifac-papersonline.net/Detailed/39509.html 04:00 PM Wednesday 31, 1969 Economic feasibility of a power plant requires smooth and uninterrupted plant operation in the face of varying electrical power demand. The feed-water system in a power plant is a major contributor to plant unavailability. The investigations about operation experiences of a power plant show that one of frequent causes of shutdowns is by violation of safety limits on the water level and is common at low operating power where the plant exhibits strong non-minimum phase characteristics. This paper presents a framework for addressing this problem based on a method of evolved control based on fuzzy model predictive control. Fuzzy model based fault detection methods are elaborated envisaging fault tolerant control. Results from validation of the evolved control system are presented. A new concept of modular evolved control system designed for a seamless and gradual integration into the existing distributed control system is proposed. http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif http://www.ifac-papersonline.net/Detailed/39533.html 04:00 PM Wednesday 31, 1969 For existed plants with minimum equipments to automatic control it is necessary to increase the safety control by using digital equipments for distributed control using modern methods for monitoring and control. It is necessary to improve the methods for early detection of process and equipment faults. This study reports the implementation test details and methods for fault detection in terms of benefits for the power plant. http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif http://www.ifac-papersonline.net/Detailed/39532.html 04:00 PM Wednesday 31, 1969 This paper developing two inputs and two outputs control systems a structure for fault detection and localization using actuators fault detection that can inform the operator about the faults following actuators blocking or changes in the burning process and heat transfer conditions and developing a simplified lumped parameters model that approximates the distributed parameters structure of steam superheaters. http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif http://www.ifac-papersonline.net/Detailed/39487.html 04:00 PM Wednesday 31, 1969 http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif http://www.ifac-papersonline.net/Detailed/39498.html 04:00 PM Wednesday 31, 1969 To improve the control quality of conventional PID controller used in complex control system, a new design strategy of fuzzy-PID controller is proposed. The tuning method based on the specified phase and gain margin is proposed to determine the parameters of the new fuzzy PID controller. Using fuzzy inference methods, the Fuzzy PID parameters can be adaptively adjusted on line for varying state of the system and changing operating condition. The strategy, which is implemented based on the Function Code on many typical Distributed Control System (DCS). The industrial application results show that many complex control system that uses this design strategy can effectively reduce the debugging time and has better control performance. http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif http://www.ifac-papersonline.net/Detailed/39527.html 04:00 PM Wednesday 31, 1969 Hydro dams are very important economical and social structures that have a great impact on the population living in surrounding area. Surveillance of dam status consists of a complex process which involves data acquisition and analysis techniques, implying measurements from sensors and transducers and visual inspection. To enhance the visual inspection process made by experts, we propose a computer vision technique that will allow assessment and quantification of water infiltrations inside the dam wall, based on infrared and visible spectrum image analysis and data fusion techniques. http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif http://www.ifac-papersonline.net/Detailed/39537.html 04:00 PM Wednesday 31, 1969 Considering both wind power drawbacks and the well known benefits and advantages of hydropower, and taking into account a general rule that stated that the power of wind plant is a fraction (30%) of wind power turbine, we proposed a hybrid eolian-hydro system for large utility system as a fine solution that has an overall integrated capacity factor better than those on we could trust before (30%). We had introduced a new efficiency factor for a better dimensioning expression of losses on dump loads in alone standing wind power plant. Finally we look for the solution on national scale, where hydro power represents a small part, fewer than 10%, as in Romania. http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif http://www.ifac-papersonline.net/Detailed/39508.html 04:00 PM Wednesday 31, 1969 Classic control systems based on continuous dimming present some difficulties to adjust their performances to the rapid changes in daylight. Therefore, fuzzy control could be a better solution. The paper analyzes the possibility to implement this new technique in daylighting control and presents the structure of a fuzzy controller proposed by authors; its operation rules and the influence on the imposed value of the illuminance level are also studied. http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif http://www.ifac-papersonline.net/Detailed/39518.html 04:00 PM Wednesday 31, 1969 e-Networks represent now an important and modern educational tools and solutions that bring together geographically distant research groups, allowing them to share data, documents, video and audio presentations, while integrating their computational and laboratory resources. The recent created EIFN Network, are implemented as a new generation communication service, not as a simply Worldwide Web application. So, they employ a sophisticated access framework, a communication infrastructure able to support multimedia flows and a component-based software construction. As the Internet is turning into a really multiservice network with a steady increase in bandwidth and decrease in response time, the environment becomes more suitable for implementations such as e-Network. http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif http://www.ifac-papersonline.net/Detailed/39519.html 04:00 PM Wednesday 31, 1969 Inverters with capacitive loads or with additional series capacity and which assure a capacitive current through series circuit usually determine observance of return time, and reactive power delivered by load is adequate for commutation of thyristors, not be necessary auxiliary turn-off circuit. These types of inverters are known below name inverters with load commutation. http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif http://www.ifac-papersonline.net/Detailed/39491.html 04:00 PM Wednesday 31, 1969 The paper presents aspects concerning two iterative methods in control design: the Iterative Feedback Tuning (IFT) and the Iterative Learning Control (ILC) approaches. The IFT is focused on a new generalized formulation that minimizes an objective function resulting in both controller and reference model tuning. The ILC is expressed as several structures including the original simplified norm-optimal ILC. The theoretical results are validated in case of PI controllers for servo systems with second-order integral type controlled plants and real-time experiments are included. The combination between IFT or ILC and fuzzy control is successful in applications leading to performance enhancement. http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif http://www.ifac-papersonline.net/Detailed/39534.html 04:00 PM Wednesday 31, 1969 A low cost solution is proposed for measuring the vibrations induced by rotating parts. Attaching very sensitive acceleration sensors allows measuring these vibrations. The signal acquired from the sensors will present a periodic behaviour which is correlated to the rotational speed of the axle. Beside the indication of the RPM of the axle, more detailed information can be extracted using signal processing techniques in order to determine the signatures associated with specific faults. http://www.ifac-papersonline.net/static/luna/images/ifac/icon-download.gif