Showing papers in "Elektronika Ir Elektrotechnika in 2011"
TL;DR: In this article, the authors proposed general and specific modeling and simulation for Lorentz LA30-12S photovoltaic panel, which is created a special function for this system by Matlab/Simulink programmer.
Abstract: This study proposes general and specific modeling and simulation for Lorentz LA30-12S photovoltaic panel. This panel has monocrystalline cell technology. The panel power parameters are examined under observing different panel temperatures. It is created a special function for this system by Matlab/Simulink programmer. Also, the different solar radiation values are taken into account. The model for the proposed range of irradiance and temperature as model inputs, with the corresponding values of voltages, currents, and power as outputs is presented. Simulation results are compared by doing power calculations. The simulation results show that a photovoltaic panel output power reduces as module temperature increases. This situation is showed with Matlab/Simulink graphics. Ill. 13, bibl. 24, tabl. 1 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.109.3.166
94 citations
TL;DR: In this article, the effects of some factors on the inrush current of transformers were investigated and it was concluded that increasing circuit resistance or switching angle with respect to the remanent flux must be selected.
Abstract: An inrush current is a transient current with high amplitude that may occur when a transformer is energized under no load or lightly loaded conditions. The magnitude of inrush current may be as high as ten times or more times of transformer rated current. This could result in huge mechanical and thermal stresses on transformer in addition to inadvertent operation of the protective relay systems. This paper represents the effects of some factors on the inrush current of transformers. For this purpose, a one-phase transformer is simulated in MATLAB and the effects of switching angle variation, the energizing circuit impedance and the remanent flux on the characteristics of inrush current are investigated. The results show that increasing circuit resistance or switching angle will decrease inrush current amplitude. Also, it is concluded that for reducing inrush current, appropriate switching angle with respect to the remanent flux must be selected. The results can be used for a better understanding of the inrush current characteristics and proper actions of the protective system. Ill. 7, bibl. 13, tabl. 1 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.109.3.162
55 citations
TL;DR: Using the lessons learned in business environment, this work designed two information dashboards for monitoring the key performance indicators of students' performance within Moodle VLE.
Abstract: Besides providing students with different representations of knowledge and enhancing interaction among teachers and students, VLEs store a vast amount of students' data with a great potential value. When adequately analyzed and reported this data can equip educators with a powerful tool to monitor how a class is doing and to react timely. Using the lessons learned in business environment, we designed two information dashboards for monitoring the key performance indicators of students' performance within Moodle VLE. Some implications of this kind of advanced data analysis and reporting are presented also. Ill. 6, bibl. 19 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.114.8.708
50 citations
TL;DR: In this paper, the authors describe a case study that was conducted at the University of Ljubljana with the aim of studying the behavior of development teams using Scrum for the first time.
Abstract: We describe a case study that was conducted at the University of Ljubljana with the aim of studying the behavior of development teams using Scrum for the first time, i.e., a situation typical for software companies trying to introduce Scrum into their development process. 13 student teams were required to develop an almost real project strictly using Scrum. The data on project management activities were collected in order to measure the amount of work completed, compliance with the release and iteration plans, and ability of effort estimation, thus contributing to evidence-based assessment of the typical Scrum processes. It was found that the initial plans and effort estimates were over-optimistic, but the abilities of estimating and planning improved from Sprint to Sprint. Most teams were able to define almost accurate Sprint plans after three Sprints. In the third Sprint the velocity stabilized and the actual achievement almost completely matched the plan. Bibl. 25, tabl. 4 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.111.5.372
48 citations
TL;DR: The goal of the work was to design and realize the wireless body sensor networks for on line vital function monitoring for health maintenance systems based on wireless sensors, information technologies and embedded computer systems.
Abstract: Health Maintenance systems are a special monitoring systems of the basic life functions. The goal of the work was to design and realize the wireless body sensor networks for on line vital function monitoring. The system is based on wireless sensors, information technologies and embedded computer systems. The man uses modified places where the monitoring systems that watch movement, position and chosen life functions are installed. In this case all the information about person's basic life functions and geographical location transmitted by wireless technology. All the measuring devices communicate with embedded microprocessor system wireless by Bluetooth or ZigBee technology. Ill. 3, bibl. 9 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.115.9.762
41 citations
TL;DR: Non-stationarities are modeled as the trends and/or level shifts in Internet traffic data, using MMPP-Based Hierarchical Model simulation data for stationarity tests and integrated into network resource allocation function as a Partially Observable Markov Decision process.
Abstract: The statistical analyses indicate that the measured traffic traces from the packet networks often contain non-stationary effects. In these cases several popular tests for long-range dependence and/or stationarity can result in wrong conclusions and unreliable estimate of the Hurst parameter. In this paper non-stationarities are modeled as the trends and/or level shifts in Internet traffic data. MMPP-Based Hierarchical Model simulation data are used for stationarity tests. Application of testing results are integrated into network resource allocation function as a Partially Observable Markov Decision process. Ill. 4, bibl. 7, tabl. 1 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.112.6.439
39 citations
TL;DR: Chromatinė dispersija (CD) turi didele įtaką perduodamo signalo kokybei didelio greicio (daugiau nei 2,5 Gbit/s) perdavimo sistemose as mentioned in this paper.
Abstract: Chromatinė dispersija (CD) turi didele įtaką perduodamo signalo kokybei didelio greicio (daugiau nei 2,5 Gbit/s) perdavimo sistemose. CD riboja perdavimo linijos ilgį. Norint užtikrinti patikimą darbą, darant gana mažai klaidų (BER), būtina kompensuoti dispersiją. Naudojant programą „OptSim“ įdiegti ir istirti nauji kombinuoti dispersijos kompensavimo metodai. Geriausių rezultatų pasiekta naudojant dispersijos kompensavimo schemą FBG-OPC, kuri užtikrina mažiausią BER reiksme verte. Il. 15, bibl. 9 (anglų kalba; santraukos anglų ir lietuvių k.). http://dx.doi.org/10.5755/j01.eee.116.10.875
36 citations
TL;DR: The paper presents the results of the rotor time constant adaptation method with the application of artificial neural network, and the different architectures of RBF network in the field of adaptation of rotor time Constant parameter.
Abstract: The paper presents the results of the rotor time constant adaptation method with the application of artificial neural network. Theestimation of the rotor time constant for adaptive model of MRAS is realized by the help of PI-controller and then is replaced by theRadial Basis Function network. The estimated rotor time constant is then used in the vector control of electrical drive. There werediscussed the different architectures of RBF network in the field of adaptation of rotor time constant parameter. Simulations have beenperformed in the Matlab-Simulink. Ill. 20, bibl. 8 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.113.7.606
29 citations
TL;DR: In this paper, the performance of a 76 W direct current operated household refrigerator powered by a photovoltaic (PV) solar panel and a battery bank was investigated, and it was shown that exergy efficiency of the system is very low due to the low energy conversion and exergy efficiencies of the PVs.
Abstract: This paper presents cool-down, and steady state performance of a 76 W direct current operated household refrigerator powered by a photovoltaic (PV) solar panel and a battery bank. Exergy method has been conducted to investigate of the performance of the PV powered household refrigerator. Experiments are conducted with different cooling loads. In use of this type system, it can be said that over-loaded condition in the refrigerator should be avoided. From the obtained results, it is seen that exergy efficiency of the system is very low due to the low energy conversion and exergy efficiencies of the PVs. This situation is also seen from exergy destruction values. For all cases, exergy is destroyed highly in the PVs. Ill. 1, bibl. 8, tabl. 2 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.114.8.684
28 citations
TL;DR: An efficient ECG modeling algorithm that describes a segmentation of a heartbeat and fitting an appropriate polynomial function to the segments is presented and is applicable to other ECG processing like: heartbeat analysis, compression and filtering.
Abstract: An efficient ECG modeling algorithm is presented in this paper. The model is based on fitting polynomial functions to real ECG. This algorithm describes a segmentation of a heartbeat and fitting an appropriate polynomial function to the segments. The model performances are evaluated in terms of PRD, preserve of ST-T segment clinical information and the execution time. When comparing this model with the existing one, the PRD improvements can be seen, especially in those signals with high morphological diversity heartbeats. Moreover, the computing time is significantly reduced. Using appropriate model features, ST-T analysis achieves an average accuracy of more than 94%. The obtained data shows that this model is applicable to other ECG processing like: heartbeat analysis, compression and filtering. Ill. 2, bibl. 9, tabl. 3 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.110.4.304
26 citations
TL;DR: The experimental results show that Pareto-optimal solutions have equal block and key sizes, and three energy/security profiles for the users of mobile devices are proposed.
Abstract: We analyse energy efficiency vs. cipher strenth of AES/Rijndael crypto algorithms in a mobile device with respect to block and key size. The experimental results show that Pareto-optimal solutions have equal block and key sizes. We also propose three energy/security profiles for the users of mobile devices. As decryption operation requires 14% more energy than encryption, the results of energy consumption measurements when performing data encrypion can be used to predict energy consumption of decryption operation. Ill. 5, bibl. 10, tabl. 2 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.108.2.134
TL;DR: Different ANN models have been developed for the short term wind speed forecasting in Batman, Turkey, using data measurements of 10 year obtained from the Turkish State Meteorological Service as discussed by the authors, and three models were developed, consisting of twenty neurons, thirty neurons and forty neurons in the hidden layers.
Abstract: In this paper, Artificial Neural Network (ANN) technique has been used for the short term estimation of wind speed in the region of Batman, Turkey. The data were collected by the Turkish State Meteorological Service (TSMS) during ten years through a network of measurement stations located in the place of interest. Different ANN models has been developed for the short term wind speed forecasting in Batman, Turkey, using data measurements of 10 year obtained from the Turkish State Meteorological Service. First a model with ten neurons in hidden layer was chosen, the results were not sufficiently satisfactory. Other three models were developed, consisting of twenty neurons, thirty neurons and forty neurons in the hidden layers. The model of forty neurons was the best for the short term wind speed forecasting, with mean squared error and regression values of 0.311136 and 0.978094 for training respectively. The developed model for short term wind speed forecasting showed a very good accuracy to be used by the General Directorate of Electrical Power Resources Survey and Development Administration (EIE) in Batman, Turkey for the energy supply.
TL;DR: In this article, a method of build-up of radiomeasuring transducers of a magnetic field on a basis magneticreactive effect in bipolar and field effect transistors is offered.
Abstract: In the given article the method of build-up of radiomeasuring transducers of a magnetic field on a basis magneticreactive effect in bipolar and field-effect transistors is offered. It is shown, that change of a reactive component of a complete resistance from induction density on electrodes a source - drain of a field-effect transistor makes 0,6 Ohm/mT, and for the bipolar transistor on electrodes the emitter-collector - 12,5 Ohm/mT. Such changes of reactive components of a complete resistance are essential, that confirms an opportu-nity of practical application of these effects for making microelectronic radiomeasuring transducers. The circuit of the transducer of a magnetic field on field-effect transistors which sensitivity makes from 510 up to 3500 Hz/mT is offered. Ill. 3, bibl. 8 (in English; ab-stracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.109.3.185
TL;DR: In this paper, the authors propose a system called Sistema suprojektuota naudojant mikrovaldiklės DsPic.
Abstract: Atliktas įterptinės valdymo sistemos, skirtos autonominiams kvadrorotoriams, tobulinimas. Sistema suprojektuota naudojant mikrovaldiklį DsPic . Bevielis rysys tarp antžeminės stebėjimo stoties ir sistemos užtikrinamas naudojant modulį Xbee . Suprojektuota valdymo sistema buvo įdiegta realioje kvadrorotorinėje sistemoje. Ji užtikrina gerą stabilizaciją, puikų valdymo sistemos kampų islaikymą pasikeitus apkrovai. Il. 15, bibl. 13 (anglų kalba; santraukos anglų ir lietuvių k.). http://dx.doi.org/10.5755/j01.eee.116.10.888
TL;DR: In this paper, a six-phase induction motor with two similar stator three phase windings, shifted by 30 degrees in space and three phase winding in rotor is considered, and differential equations of this motor are presented and transformed to dq synchronous reference frame.
Abstract: The six-phase induction motor with two similar stator three phase windings, shifted by 30 degrees in space and three phase winding in rotor is considered. Differential equations of this motor are presented and transformed to dq synchronous reference frame. Dynamic equivalent circuits for each component are presented. Transformed equations are expressed in matrix form and are solved by MATLAB software using Dormand-Prince (ode45) method. Transient characteristics of torque, speed and current of six-phase induction motor are calculated and discussed. Ill. 6, bibl. 12, tabl. 1 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.111.5.369
TL;DR: In this article, a notch/all-pass filter with two electronically adjustable three-port current conveyors of the second generation (CCIIs) or one conveyor and one voltage buffer employing only four passive elements is presented.
Abstract: The notch/all-pass filter with two electronically adjustable three-port current conveyors of the second generation (CCIIs) or oneconveyor and one voltage buffer employing only four passive elements is presented in this paper. Used active elements allow the controlof current transfer via DC control voltage. Therefore an adjusting of the attenuation in the stop band of the notch filter is possible. Thetransfer function and major parasitic influences of real active parts are discussed. The verification includes PSpice simulation withprofessional macromodels and measurement with available current conveyors in frequency domain. Ill. 7, bibl. 40 (in English; abstractsin English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.113.7.609
TL;DR: In this article, the possibilities of use of thermovision technique in diagnostics of aerial systems of radio transmitters were discussed, and the relationship between temperature rise amount of connection and feeder line upon power was investigated.
Abstract: The paper deals with possibilities of use of thermovision technique in diagnostics of aerial systems of radio transmitters. Graphically presented: heating characteristic of the junction at the transmitter power of 60 % (slack and polluted junction); relationship between temperature of connection (feeder – line, capacitor frame) spacing collar and power; relationship between temperature rise amount of connection and feeder line upon power; thermogram of the junction feeder line – spacing collar, capacity frame; thermogram of the junction feeder line – spacing collar.
TL;DR: In this paper, an efficient method based on hybrid genetic algorithm-particle swarm optimization (GA-PSO) for economic dispatch (ED) problem is proposed, children created by using similarity measurement between mother and father chromosomes relationship.
Abstract: Economic dispatch problem is an optimization problem where objective function is highly nonlinear. In this paper, an efficient method based on hybrid genetic algorithm- particle swarm optimization (GA-PSO) for economic dispatch (ED) problem is proposed. In the proposed method, children created by using similarity measurement between mother and father chromosomes relationship. The feasibility of the proposed approach is demonstrated for solve various types of economic dispatch (ED) problems in power systems such as, economic dispatch with valve point (EDVP) effects, the ED of generators with prohibited operating zones and ED with only fuel options and it is compared in the recent literature. The study results show that the proposed approach is more efficient in finding higher quality solutions in various type ED problems. Ill. 3, bibl. 20, tabl. 10 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.108.2.155
TL;DR: In this paper, the integrated circuits of transducers of a magnetic field in which magnetic sensitive transistors act in a role of active elements of autogenerating arrangements are presented.
Abstract: In the given article the integrated circuits of transducers of a magnetic field in which magnetic sensitive transistors act in a role of active elements of autogenerating arrangements of transducers that simplifies circuits of sensor controls of a magnetic field are offered. It is shown, that for the complete embodying transducers in an integrated view the passive tuned-circuit inductance of the arrangement is implemented as the reactive transistor. The greatest sensitivity which changes from 7,2 kHz/mT up to 6,3 kHz/mT , the circuit design about a magnet a sensing element has on the basis of two collector bipolar transistors with the active inductive element. Ill. 9, bibl. 7 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.110.4.289
TL;DR: The paper deals with modelling and design of HF 200 kHz (and more) low-power transformers with determinated leakage inductance for both hard- and soft-switching applications and minimized weights and dimensions of the trans-formers.
Abstract: The paper deals with modelling and design of HF 200 kHz (and more) low-power transformers with determinated leakage induct-ances for both hard- and soft-switching applications. The first group features by small value of the leakage inductance contrary to sec-ond one demanding that value substantially higher. The further aims of the design are minimized weights and dimensions of the trans-formers. Results of numerical simulations and experimental verifications of designed transformers operated in converter circuits are given at the end of the paper. Ill. 13, bibl. 5, tabl. 2 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.110.4.276
TL;DR: In this paper, a model based on the clear sky standard, which allows calculation of solar insolation values at each location in Lithuania, is presented, which is associated with geographical coordinates of Lithuania and local time of every day of the year.
Abstract: Presented the model based on the clear sky standard, which allows calculation of solar insolation values at each location in Lithuania. Model is associated with geographical coordinates of Lithuania and local time of every day of the year. It is made for modeling electronic systems for management of solar panels and solar thermal collectors. Model was tested by calculating solar insolation at 313 369 locations of Lithuania. It is shown that the lowest insolation in territory of Lithuania on noon of June 21 is 375 m 2 and the highest is – 439 W/m 2 . Deviation of solar insolation values from average is ±8%. In addition, it is shown that the changes in solar insolation are caused by zenith or altitude angle variations. Model is suitable for calculation of optimal angles of solar panels and solar thermal collectors in any location of Lithuania. Ill. 4, bibl. 8 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.108.2.132
TL;DR: The goal of this work is design and implementation of medical non-invasive blood pressure measurement chain with distance data transmission and visualization and the wire and the wireless communication interface used for highly efficient data.
Abstract: The goal of this work is design and implementation of medical non-invasive blood pressure measurement chain with distance data transmission and visualization. The main contribution is the wire and the wireless communication interface used for highly efficient data. The complete presented solution was realized and tested with the reference Fluke BP Pum 2. Results of this work can be used as modern biotelemetry equipment in medical doctor’s offices with mobile and flexible features. Ill. 7, bibl. 3, tabl. 2 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.116.10.880
TL;DR: The presented research authors concentrate on the development of a mobility device for the paralyzed people, trying to develop an effective multimodal HCI algorithm by combining the traditional input with speech and video recognition technologies into one associative "package".
Abstract: Most serious accidents and injuries often end with various motoric disabilities usually resulting in a limited control of the muscles of various body parts and in some worst case scenario even the whole body. The associated governmental support programs of today are targeted at providing the technological means enabling the handicapped persons to have as independent life as possible. In the presented research authors concentrate on the development of a mobility device for the paralyzed people, trying to develop an effective multimodal HCI algorithm by combining the traditional input with speech and video recognition technologies into one associative "package". Paper reviews some of the associated research on the topic, a proposed algorithm for the multimodal wheelchair control and a scheme of implementation. Ill. 2, bibl. 17 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.111.5.362
TL;DR: In this paper, the electrical power quality of an induction motor of 75 kW was analyzed using spectral analysis methods and the dominant harmonics were obtained as 5th, 7th, 11th, 13th and 17th harmonics as well as fundamental frequency at 50 Hz.
Abstract: This paper analyses the electrical power quality for the induction motor of 75 kWusing the spectral analysis methods. Measurements are carried out by collecting the current and voltage variations in a ceramic factory. Spectral analyzing techniques are applied to the collected data to get the spectral properties. Hence, induction motor operation regions are categorized under three zones. These are no-load condition; transient case from no-load to load and full-load, respectively. Consequently, the variations of the harmonics are compared with each other under these different operation conditions and then the most important characteristics of the harmonics are determined. In this manner, dominant harmonics are obtained as 5th, 7th, 11th, 13th and 17th harmonics as well as fundamental frequency at 50 Hz. Ill. 9, bibl. 18, tabl. 1 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.108.2.149
TL;DR: In this paper four new extended boost qZSIs with continuous input current were presented, analyzed and compared, and some problematic issues of these converters were pointed out and discussed.
Abstract: In this paper four new extended boost qZSIs with continuous input current were presented, analyzed and compared. Moreover, some problematic issues of these converters were pointed out and discussed. Theoretical background was verified by the simulations and experiments. Ill. 14, bibl. 9, tabl. 1 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.112.6.444
TL;DR: In this article, the strengths of computer-generated electric and magnetic fields in the frequency ranges 5 Hz - 2 kHz and 2 kHz - 400 kHz in a computer classroom were modeled with the help of the software VIZIMAG.
Abstract: Operation of office, video and audio equipment generates electromagnetic fields. Many employees who use computers for a long time complain of headaches and other health troubles. This has become a serious problem as electromagnetic fields are invisible and intangible and an employee, therefore, is unaware of how to protect oneself from them. This work involves modelling of the strengths of computer-generated electric and magnetic fields in the frequency ranges 5 Hz - 2 kHz and 2 kHz - 400 kHz in a computer classroom. After measuring the initial parameters of an electric and a magnetic field, electromagnetic fields propagating in the classroom were modelled with the help of the software VIZIMAG. Propagation and directions of electromagnetic field isolines are also presented. The modelling software VIZIMAG allows us to identify the strength of electric field or the frequency of magnetic field as well as the area of a room where they are present. Separate models are designed for both electric strength and magnetic flux density. Ill. 9, bibl. 11, tabl. 1 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.109.3.175
TL;DR: In this article, a standard bidirectional DWDM solution is taken for further research, based on ITU standards and available resources, and a real-working DMM system with 40 Gbit/s total capacity is taken.
Abstract: In this paper a standard bidirectional DWDM solution is taken for further research. Basing on ITU standards and available resources we have taken a real-working bidirectional 72.8 km reach DWDM system with 40 Gbit/s total capacity for further research. The system terminates four 10 Gbit/s channels and transports them through optical fiber to the total distance of 72.8 km. According to investigated DWDM system we have created a simulation scheme in OptSim software with the real parameters of all modules. In order to prove the accuracy of simulation, its results are compared with the real ones. The goal of this paper is to modify the simulation scheme and to gain results for further optimization of bidirectional DWDM solution. Ill. 8, bibl. 6 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.115.9.745
TL;DR: In this article, a new BJT-based configuration for providing first-order current mode high-pass, low-pass and all-pass filter responses from the same configuration is suggested.
Abstract: In this paper, a new BJT based configuration for providing first order current mode high-pass, low-pass and all-pass filter responses from the same configuration is suggested. The proposed circuit called as a universal filter possesses some important advantages such as consisting of low component count BJT and a grounded capacitor, having electronic tunability property of its pole frequency and having electronic controllability feature of filter types. The suggested circuit does not suffer from disadvantages of use of the resistors. Moreover, as an application, second order band-pass filter is also obtained by cascading two proposed filter structure. Simulations by means of PSpice program are accomplished to demonstrate the performance and effectiveness of the developed first-order universal filter. Approximately more than 1 decade tunability range is achieved. Ill. 7, bibl. 14, tabl. 3 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.112.6.448
TL;DR: In this article, the second type of method is considered: successive model linearization along predicted state and input trajectories, where the nonlinear behavior is represented by recurrent set of linear time-varying models.
Abstract: Model predictive control techniques for nonlinear systems very often take advantage of nonlinear model linearization. The modelcan be linearized once or repeatedly. In the paper the second type of method is considered: successive model linearization alongpredicted state and input trajectories. The nonlinear behaviour is represented by recurrent set of linear time-varying models. Solution ofsuch optimal non-linear model predictive control problem is mostly obtained in an iterative way where the most important step is thesuccessive system linearization along predicted trajectory. The main aim of the paper is to analyse convergence of the consideredNMPC method, discuss problems concerning necessary condition for the convergence and prove proposed solutions. Ill. 1, bibl. 11 (inEnglish; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.113.7.607
TL;DR: In this article, the authors present a fault location system for the smart electric power distribution network, discusses the challenges of smart grid fault location, and describes the method for one phase to ground fault location which is based on fast transient analysis.
Abstract: The smart grid is the vision of the electric power network which integrates the electrotechnical, communication and informatics technologies. This integration allows developing new fault location technologies which are based on methods of fast transients analysis. The usage of these methods allows to locate the fault faster and more reliably or to prevent possible faults. The topic explains the structure of the fault location system for the smart electric power distribution network, discusses the challenges of smart grid fault location system and describes the method for one phase to ground fault location which is based on fast transient analysis. Ill. 2, bibl. 13 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.112.6.461