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Industrial Technology, 2006. ICIT 2006. IEEE International Conference on

Date 15-17 Dec. 2006

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Displaying Results 1 - 25 of 540
  • Impact of the Undesired RF-IF Chain Effects on the LS-CMA based Beamformer in CDMA Mobile Communications

    Publication Year: 2006 , Page(s): 596 - 600
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2069 KB) |  | HTML iconHTML  

    In mobile communications, nonideal operation of the RF-IF chain has significant effects on the signal received by the BS. Since most beamforming algorithms use the received signal parameters to steer suitable beam, any error or uncertainty cause significant degradation in beamforming performance. In this paper, effects of some of the most important RF-IF chain errors occurred in down conversion process are investigated theoretically as well as by simulation. Our investigations show that the error caused by the difference between down converters, has a significant effect on the beamformer performance. It is shown that the RF-IF chain phase and amplitude errors have a more significant effect on the beamformer performance than the other errors. Because of the higher sensitivity of the phase of the received signal, phase error has the most significant effect. View full abstract»

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  • A methodology for Automatic Detection and Extraction of Road Edges from High Resolution Remote Sensing Images

    Publication Year: 2006 , Page(s): 69 - 74
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3352 KB) |  | HTML iconHTML  

    Based on analysis of roads features in high resolution remote sensing (RS) images, we improve the traditional algorithm for automatic edge detection and extraction and put forward a new methodology. Mathematical morphology reconstruction and boundary tracing algorithm are introduced to automatically detect and extract edges from high resolution RS images. Three factors, P factor, F factor and C factor, are defined to describe the shape characteristics of edges. K-mean cluster algorithm is then utilized to identify and extract road edges from the huge edge sets. Finally an example gives fine result of this methodology. View full abstract»

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  • Development of New Well Drilling Monitoring System

    Publication Year: 2006 , Page(s): 75 - 79
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2899 KB) |  | HTML iconHTML  

    This paper presents a novel monitoring system for oil and gas well drilling based on field bus and AI technology. The Controller Area Network (CAN) intelligent node was designed to simplify the data acquisition process. As a key part, the traditional Thermo Conductive Detector (TCD) and Flame Ionization Detector (FID) were replaced by the infrared detector which contributed greatly to reduce the size of gas monitoring module. A rule-based logging expert system was also designed to improve the drilling operation. The results of 1635 well logging have proved that this system had the characters of miniaturization, flexible configuration, and powerful function. View full abstract»

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  • Research on Agent Coordination Controller Based On Fuzzy Petri Nets

    Publication Year: 2006 , Page(s): 397 - 401
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (639 KB) |  | HTML iconHTML  

    Agent is one of the representative subjects for research in the field of artificial intelligent. And the architecture of agent is a problem under hot discussion. The classes of agent architecture are introduced in detail and the main approaches to improve the performance of the hybrid agent is discussed in this paper, based on the analysis on the architecture of agent. A coordination controller model of agent based on fuzzy Petri nets is proposed, aim at the problem exist in the coordination controller in the hybrid agent model. And some experiments are given out to illustrate the working process of agent coordination controller based on fuzzy Petri nets. View full abstract»

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  • Comprehensive Analysis and Design for One-Cycle Controlled DC Side APF

    Publication Year: 2006 , Page(s): 750 - 755
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4727 KB) |  | HTML iconHTML  

    Currently one-cycle control (OCC) theory is widely used in the control of APF and other FACTS. In contrast to previously proposed methods, there is no need to generate a current reference for the control of the converter current, thus no need for a multiplier and no need to sense the AC line voltage, the APF current, or the nonlinear load current. Only one current sensor and one voltage sensor are used to sense the AC main current and the DC-link capacitor voltage. The DC side active power filter (APF) is shunted at the DC side of rectifier bridge, which has great technical advantages in harmonic suppressing for rectifier load. The circuit topology and basic principle of DC side APF based on OCC are firstly analyzed, and then the estimated formulas and design to determine the main circuit parameters, such as the inductance L, the DC side capacitor C of APF, are given in this paper. The large signal model for DC side APF is derived out based on energy balance, then the design for PI controller about APF's control system is accomplished, and the control system is corrected to be typical II system which can eliminate the steady error and improve the anti-disturbing ability. All of the above analysis and design give the theory basis for designing a DC side APF. The theoretical analysis and design are verified by prototype experiments. View full abstract»

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  • A PC-Based Implementation of a Load Resonant Cyclo-Inverter

    Publication Year: 2006 , Page(s): 535 - 539
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4159 KB) |  | HTML iconHTML  

    This paper proposes a novel, power electronics system, a PC based load resonant cyclo-inverter, capable of converting a single phase AC supply of frequency fi into a single phase AC supply of frequency fo that is higher than the input frequency. Use of PC to control the trigger pulses has made it more versatile. It finds its application in induction heating, ballast and so many applications where high frequency reduces the size of equipment. The actual performance of this converter is obtained by simulating it on a software package PSPICE. Peripheral input-output and PC interfacing hardware has been developed using programmable devices. The trigger circuit has been tested qualitatively by observing various waveforms on CRO. The operation of proposed system has been found satisfactory. View full abstract»

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  • Analysis and Design of a Two-Output Forward Converter with an Output Voltage Objective Function

    Publication Year: 2006 , Page(s): 540 - 545
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (529 KB) |  | HTML iconHTML  

    A new method is proposed in this paper to distribute the steady-state errors of the output voltages in a two-output forward converter. The cross regulation among the two output voltages are described in terms of the circuit parameters. An objective function is formed for each of the two dc outputs to track its reference within the specified error. The weighting feedback gains of the two output voltages and the duty cycle range can be determined by the presented control scheme which optimizes the objective function. The proposed method is especially suitable for a two-output system without a dominant load. Experiments on a prototype are performed to show that there exists a duty cycle range and a set of weighted feedback gains satisfying the defined objective function. View full abstract»

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  • A Comparative Evaluation of Three-Phase High Power Factor Boost Converters for Power Quality Improvement

    Publication Year: 2006 , Page(s): 546 - 551
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3623 KB) |  | HTML iconHTML  

    The generation of harmonics and reactive power flow in a power system is greatly influenced by the widespread use of Power Electronic converters in addition to other sources of harmonics and reactive power generation. This paper gives a comparative evaluation of some improved power quality three-phase Boost converters based on their performance, specifically from the point of view of improved power quality produced by them on the line side of converter. The comparative evaluation is performed on the basis of the results obtained from the computer simulations and is of interest to researchers and application engineers working in the field of power quality as it helps them to select an appropriate converter for a specific application and power quality requirements in the system. The paper also gives a brief description of each converter topology with its specified control strategy. View full abstract»

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  • A Simple and Effective Method to Segment Moving Vehicle Cast Shadow

    Publication Year: 2006 , Page(s): 402 - 406
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4791 KB) |  | HTML iconHTML  

    According to light, shadows interfere with moving vehicle extraction and location and recognition. For this reason, shadow segmentation is an important step in real-time vehicle recognition system. In this paper, we propose a simple and effective method to segment moving vehicle cast shadow. The proposed method exploits spectral and geometrical properties of shadows and relationship between the point in shadow region and space position and shape of vehicle. Feature points of occluding function are detected using multi-resolution of wave transform and the boundary between self-shadow and cast shadow is detected. The proposed method does not know in advance the light direction and the color information of vehicle and background information. Our experimental results show that the proposed method is robust and effective in detecting shadows. View full abstract»

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  • Load Current estimation in single-phase inverters using D.C. line current

    Publication Year: 2006 , Page(s): 552 - 556
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3680 KB) |  | HTML iconHTML  

    Single Phase Inverters are commonly used in computer power supply units. To implement the current control loop, Hall sensors at the load terminals are generally used. In this paper, the Load Current Sensor is substituted by a high bandwidth d.c. line current monitor. The actual load current of any waveform is estimated by monitoring the d.c. line current. A current sensing resistor along with an operational amplifier may be used for this purpose. The instantaneous load current estimator is almost at the ground potential and is not subjected to any large voltage swings. For implementing a sinusoidal trajectory tracking current controller, the output from the estimator is used as the feed back signal. The scheme was simulated in PSPICE and MATLAB. The Digital Controller for the Inverter was implemented using the FPGA chip EP1C3T100C7. View full abstract»

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  • Diagnosability Analysis of Real Time Hybrid Systems

    Publication Year: 2006 , Page(s): 104 - 109
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (673 KB) |  | HTML iconHTML  

    A method of analyzing fault diagnosability has been proposed for real time hybrid system (RTHS) models. The RTHS modeling formalism is presented and the properties of such models under measurement limitation is discussed. A definition of diagnosability of these models is adopted from the literature on discrete event systems (DES). Based on the measurement limited model, an algorithm for construction of a diagnoser is presented. It is then argued that the diagnosability condition of the diagnoser which has been shown to be necessary and sufficient for DES diagnosability fails to hold for many systems, of which hybrid system is an example. This is because the abstraction employed in formulating the DES models from hybrid systems obliterates an important property of the transitions namely, their fairness. Incorporating this property the diagnosability condition over the diagnoser is suitably modified. View full abstract»

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  • Fault Detection, Isolation and Reconfiguration in Presence of Incipient Sensor Faults in an Electromechanical Flight Control Actuation System

    Publication Year: 2006 , Page(s): 92 - 97
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3425 KB) |  | HTML iconHTML  

    This paper presents a scheme for the detection and isolation of incipient sensor faults in a flight control actuation system. The system considered here is a practical system, which is an electromechanical flight actuator, based on a DC torque motor. The scheme utilizes the analytical redundancy that exists in the system between the linear actuator position, motor shaft velocity and motor current for detection and isolation of the incipient sensor faults. The scheme is based on a single Luenberger observer, which is driven by the motor shaft velocity sensor. Residuals that can indicate various types of faults are generated from the estimate of the sensor output provided by the Luenberger observer. The capability of the residuals, to detect and isolate incipient faults in the sensors, such as bias errors and scale factor errors is demonstrated through simulations. In the event of fault in the position sensor, real time reconfiguration using an estimate of the position from the observer is used for continued operation of the system. The robustness of the fault detection scheme to parameter variations is also examined. View full abstract»

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  • An efficiency improvement study of the full bridge converter at a system load operation

    Publication Year: 2006 , Page(s): 785 - 790
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2880 KB) |  | HTML iconHTML  

    From a DC/DC converter's system load viewpoint, an efficiency improvement study of the phase shift PWM control full bridge converter operated at a wide load range is presented in this paper. Firstly, the relationship among MOSFET ZVS characteristics, circulating current and loss duty cycle due to the effective primary series inductor is investigated. Accordingly, the power losses estimations of the key components are deduced subsequently. In case of the nominal system load is not operated at a full load condition, some efficiency improved schemes are also provided. View full abstract»

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  • Indirect Rotor Flux Oriented Control of A Seven-Phase Induction Motor Drive

    Publication Year: 2006 , Page(s): 440 - 445
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3838 KB) |  | HTML iconHTML  

    Multi-phase ac motor drives are nowadays considered for numerous applications, due to numerous advantages that they offer when compared to their three-phase counterparts. In principle, control methods for multi-phase machines are the same as for three-phase machines. This paper analyses operation of an indirect rotor flux oriented controlled seven-phase induction machine with current control in the stationary reference frame. Performance, obtainable with hysteresis current control, is illustrated for a number of operating conditions on the basis of simulation results. Full decoupling of rotor flux control and torque control is realised. Dynamics, achievable with a seven-phase vector controlled induction machine, are shown to be essentially identical to those obtainable with a three-phase induction machine. View full abstract»

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  • Simultaneous vibration suppression control of PMSM using repetitive control with Fourier series

    Publication Year: 2006 , Page(s): 854 - 859
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5785 KB) |  | HTML iconHTML  

    This paper proposes a suppression control method of the motor frame vibration caused by the torque ripple of PMSM. The method utilizes the feedforward compensation signals by the repetitive control and the Fourier series expansion using a vibration signal obtained by an acceleration sensor which is attached to the motor frame. In order to realize on-line generation of the feedforward compensation signals to reduce the vibration, a novel parameter auto-tuning method for the repetitive control is proposed. The method enables to shorten time to suppress the torque ripple since simultaneous vibration suppression control can be achieved. The effectiveness of the proposed method is illustrated through some experimental results. View full abstract»

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  • Design of Optimum PID Controller by Bacterial Foraging Strategy

    Publication Year: 2006 , Page(s): 601 - 605
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (372 KB) |  | HTML iconHTML  

    In this paper, a method for determining the optimal PID parameters using the bacterial foraging (BF) algorithm is presented. The paper demonstrates how to apply BF method to search efficiently the PID parameters by minimizing integral of time error squared (ISTE) criterion. Simulation of various process plant models shows better control performance, thereby, indicating the effectiveness of the proposed method. View full abstract»

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  • A study of the interleaved buck derived converters

    Publication Year: 2006 , Page(s): 557 - 562
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3170 KB) |  | HTML iconHTML  

    Interleaved method is a trend to design high power density DC/DC converter. In this paper, detailed evaluation four interleaved buck derived converters in the aspects of output circuit topologies, component counts and power losses, then a suitable topology can be determined based on a specified power requirement. Furthermore, some simulation and experimental results are provided. View full abstract»

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  • Modeling for IGBT

    Publication Year: 2006 , Page(s): 563 - 567
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1263 KB) |  | HTML iconHTML  

    A mathematical model has been developed for an insulated gate bipolar transistor (IGBT) by compartmenting it into two diodes which are connected in series with reverse configuration. One diode is an ordinary diode while other is a controlled diode. The performance of the controlled diode depends upon the magnitude of gate emitter, GE voltage and collector emitter (CE) voltage. A GE voltage Vg > Gate Emitter Threshold Voltage (VGET), modulates the conductivity of controlled diode together with hole injection from the p+ base near the collector terminal. Parameters of these diodes are estimated by applying curve fitting tool and power invariance method. The validity of the model has been checked by a simulation example. The results of simulation show appreciable closeness with actual one. View full abstract»

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  • Speed Sensorless Nonlinear Control for PM Synchronous Motor Fed by Three-Level Inverter

    Publication Year: 2006 , Page(s): 446 - 451
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3479 KB) |  | HTML iconHTML  

    To improve the performance of the conventional sliding mode speed observer at low-speed, a speed observer based on the techniques of modified exponent-approaching sliding mode control and extended Kalman filter is proposed. To simplify the algorithm of the voltage space vector modulation for three-level inverter, a simple modulation method with a minimum amount of harmonic distortion is studied in detail. Aimed at the nonlinear characteristics of a PMSM, a feasible nonlinear control scheme based on the fuzzy neural network technique is presented and the stability of the speed control system is proved. The simulation results confirm that the proposed cascade speed observer is a favorable state observer and can achieve the desired speed tracking objective under a wide-speed range. The output waveforms of the inverter voltages illustrate that the proposed modulation algorithm is effective and the neutral-point voltage is balanced. In contrast with the conventional backstepping controller, the developed nonlinear speed controller is robust to the uncertainties, which consists of a RFNN controller and an adaptation law controller. View full abstract»

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  • Independent Control of Inductance and Resistance of Active Reactor

    Publication Year: 2006 , Page(s): 1682 - 1686
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3612 KB) |  | HTML iconHTML  

    A new control method for independently regulating the equivalent inductance and resistance of an active reactor based on magnetic flux control was presented, and the generating condition of negative inductance and negative resistance is also proposed. The active reactor is composed of a primary winding and a coupled compensation winding. When the current injected into the compensation winding is in phase or out of phase with the primary current, the inductance of the primary winding can be adjusted independently. When the compensation current is of orthogonal phase with the primary current, the resistance of the primary winding can be changed independently. Simulation and experiment results verify the feasibility of the independent control method. View full abstract»

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  • Analysis and Control of Commutation Torque Ripple in Four-Switch, Three-Phase Brushless DC Motor Drive

    Publication Year: 2006 , Page(s): 239 - 246
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1743 KB) |  | HTML iconHTML  

    Torque ripple generated in the commutation interval is one of the main drawbacks of BLDC motor. This paper presents an original study on the generated torque ripples due to phase commutation in the four-switch, three-phase inverter (FSTPI) brushless dc motor drive which are suitable for low cost applications. Torque ripple and commutation duration values are obtained for different operation conditions and problem in high speed region of FSTPI-BLDC is shown. Then a novel current control technique is developed to minimize the commutation torque ripple for entire of speed range. The technique proposed here is based on a strategy that the current slopes of the rising and the decaying phases during the commutation intervals can be equalized by proper duty-ratios in each operation mode. View full abstract»

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  • Optimal Location of Thyristor Controlled Phase Shifter in Restructured Power Systems By Congestion Management

    Publication Year: 2006 , Page(s): 294 - 298
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1119 KB) |  | HTML iconHTML  

    Restructuring in power systems requires expanding capacity of transmission systems to avoid some problems such as cost, right-of-way, and expansion needs. Nowadays flexible AC transmission system (FACTS) devices are known as important equipments for reducing the flows in loaded lines by increasing loadability, decreasing system loss, improving stability of the network and reducing the cost of production. In this article, by using congestion management in normal and contingency conditions, best location of a phase shifter will be determined to reduce production cost and increase loadability in power markets. The proposed method is used to demonstrate its effect on IEEE 30-bus standard system and to fulfill optimization by quadratic programming. View full abstract»

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  • Differential Evolution Made Faster And More Robust

    Publication Year: 2006 , Page(s): 606 - 611
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (532 KB) |  | HTML iconHTML  

    In this paper, an improved version of the differential evolution (DE) based on the orthogonal design (ODE) is presented to make the DE faster and more robust. The ODE combines the conventional DE (CDE), which is simple and efficient, with the orthogonal design, which can exploit the optimum offspring. The ODE has some new features. (1) It uses a robust crossover based on orthogonal design and an optimal offspring is generated with the statistical optimal method. (2) Decision variable fraction strategy is applied to decrease the number of the orthogonal design combinations and make the algorithm converge faster. (3) The ODE simplifies the scaling factor F of the CDE, which can reduce the parameters of the algorithm and make it easy to use for engineers. We execute the proposed algorithm to solve twelve benchmark functions with low or high dimensions and a large number of local minima. Simulations indicate that the ODE is able to find the near-optimal solution in all cases. Compared with some state-of-the-art evolutionary algorithms, the performance of the ODE outperforms other evolutionary algorithms in terms of the quality of the final solution and the stability; and its computational cost (measured by the average number of fitness function evaluations) is lower than the cost required by the other techniques compared. View full abstract»

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  • Research on Tractive Characteristics of the Single Linear Induction Motor

    Publication Year: 2006 , Page(s): 35 - 38
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2962 KB) |  | HTML iconHTML  

    The SLIM has been widely applied in transportation for its simple-firm structure and its directly forward electromagnetic thrust. The motor has transverse and longitudinal end-effects because of its discontinuous magnetic circuit. There are eddy currents, which become greater as motor speed increases, occurring in both entrance and exit of its secondary sheet. End effects and eddy currents bring ill impact to air gap magnetic flux, which reduce its available magnetic flux and pull coefficient. This paper works out the d-q axis equivalent circuits of SLIM considering end effects. The changes of mutual inductance and resistance in d-axis indicate both the second longitudinal end effect and the eddy current influences. Then the article establishes SLIM math equations connected with the rotor-flux oriented (RFO) vector control theory. This paper brings forward uds, uqs, iqs online decouple compensation basing on the rotor magnetic flux, speed, current regulators, which adjust and accommodate tractive force, d-q axis voltages, d-q magnetic fluxes, d-axis mutual inductance. The simulation and experimental results indicate that this method is reasonable, which provides theory guidance to the SLIM application analysis and achieves some active effects. View full abstract»

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  • Detection of Inter-turn Short-circuit Fault in Induction Motor Using Theory of Instantaneous Symmetrical Components

    Publication Year: 2006 , Page(s): 460 - 464
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2714 KB) |  | HTML iconHTML  

    The use of electric motors in industry is extensive. These motors are exposed to a wide variety of environments and conditions, which age the motor and make it subject to inter-turn incipient faults. Stator winding is the heart of machine. Therefore, it is always essential to check winding performance from time to time. This can be done by various conventional methods are discussed here, and noninvasive approach, using the theory of instantaneous symmetrical component is introduced. The simulation and experimental results are reported to demonstrate the effectiveness of the proposed technique. View full abstract»

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