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Industrial Electronics Society, 2003. IECON '03. The 29th Annual Conference of the IEEE

Date 2-6 Nov. 2003

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Displaying Results 1 - 25 of 184
  • Modeling, simulation, and analysis of active filter systems using generalized state space averaging method

    Page(s): 1999 - 2004 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (418 KB) |  | HTML iconHTML  

    In this paper, modeling and analysis of active filter systems based on the generalized state space averaging method is presented. The non-linear equations of the system are converted to a linear state space model. A fast and reliable approximation of the system is achieved in this method. Long execution time, divergence problem, and huge produced files, which are difficulties associated with the conventional modeling techniques of active filter systems, are not present in the proposed method. In addition, the developed models can be used for the purpose of control and stability assessment. The method is applicable to different topologies and control techniques. In this paper, modeling and simulation results are presented for typical single-phase shunt, single-phase series, and three-phase shunt active filter systems. Experimental results are also provided for the verification of the proposed approach. View full abstract»

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  • Dual stage actuator control in hard disk drive - a review

    Page(s): 2132 - 2137 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (447 KB) |  | HTML iconHTML  

    This paper provides a comprehensive review of various methods suggested over the past few years to design controller for dual-actuated servomechanism in hard disk drives. Main challenges in the design are explained, and different methods are compared based on these factors. View full abstract»

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  • An image compressing algorithm based on PCA/SOFM hybrid neural network

    Page(s): 2103 - 2107 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (428 KB) |  | HTML iconHTML  

    Neural network is a very efficient method for image compression. It is suited to the problem of image compression due to its massively parallel and distributed architecture. Principle component analysis (PCA) neural network model and self-organizing feature map (SOFM) neural network model are often adopted for image compression in many references. In this paper, the authors propose an image compressing algorithm based on PCA/SOFM hybrid neural network, which has the advantages of both PCA and SOFM. A new method of selecting initial codebook and distortion criterion is presented to improve the efficiency of SOFM neural network according to the statistical feature of PCA transformational coefficient. Simulation results show that compared to successive PCA and SOFM algorithm or basic SOFM algorithm, PCA/SOFM hybrid algorithm has many advantages: lower memory storage; substantial reduction of computation and better performance of codebook. View full abstract»

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  • A new synchronous frame current reference generation for hybrid active filter and system stability analysis

    Page(s): 2011 - 2016 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (405 KB) |  | HTML iconHTML  

    In this paper, the authors present a new synchronous frame current reference generation method for hybrid active power filter (HAPF), which can extract both harmonic and reactive current contained in the nonlinear load under the condition of unsymmetrical and non-sinusoidal source voltages. Furthermore, this method can extract selective order of harmonics, which enables the active filter to detect and compensate the lower order of harmonics while the passive counterpart compensates the residual harmonics. The stability of the system is also studied. Finally simulation and experimental results are presented to verify the effectiveness of the proposed method. View full abstract»

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  • MOS-controlled diode (MCD) on silicon-on-insulator (SOI)

    Page(s): 2602 - 2606 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (326 KB) |  | HTML iconHTML  

    The performance of the diode is an importance factor in achieving good efficiency for a power integrated circuit. In this paper, a MOS-controlled diode (MCD) for power integrated circuits is presented. The proposed structure utilizes active control to switch the diode between unipolar and bipolar operating modes so that the device can operate at its optimum condition for both static and dynamic performances. The proposed MCD on SOI demonstrated significant advantage over a P-i-N diode or the body diode of an LDMOS. It is found that, with optimum control, it can reduce the diode reverse recovery loss by 10 times and the corresponding switch turn-on loss by a factor of 3, without sacrificing its on-state conduction voltage. The traditional trade-off between on-state voltage and reverse recovery speed can therefore be avoided and significant improvements in overall system efficiency can be achieved. Advantages of an integrated MCD over its discrete version are also discussed. View full abstract»

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  • Role of electronics and controls in steering systems

    Page(s): 2859 - 2864 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (491 KB) |  | HTML iconHTML  

    Automotive steering systems have gone through several changes over the years since its first introduction in early 1900's. The advances in electronics, controls, and electrical machines are enabling the replacement of hydraulically assisted steering to electromechanically assisted steering. These also enabled the introduction of four-wheel steering, which gives the driver much more vehicle maneuverability and safer operation. Integration of steering and other chassis functions provides improved vehicle stability under various driving conditions. This paper discusses the role of electronics in the present and future steering systems. View full abstract»

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  • Electromagnetic noises and efficiency evaluations of three-phase ZVS-PWM inverter with new resonant AC link snubbers

    Page(s): 2911 - 2916 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (486 KB) |  | HTML iconHTML  

    This paper presents a novel prototype of three-phase voltage source type zero voltage soft-switching (ZVS) inverter using the main and auxiliary IGBT power module packages in order to reduce their switching power losses as well as electro-magnetic conductive and radiative noises. A single inductor-based resonant AC link snubber circuit specified as one of auxiliary resonant commutation snubbers to achieve the ZVS for the three-phase voltage source type inverter operating under a principle of specific instantaneous space voltage vector sinewave modulation is originally demonstrated as compared with the other types of resonant AC link snubber circuit topologies. In addition to this, its operation principle and unique features are described in this paper. The practical basic operating performances of the new conceptual instantaneous space voltage vector modulated three-phase voltage source soft-switching inverter are evaluated and discussed on the basis of waveforms quality evaluations on the output line to line voltage, power loss analysis, power conversion efficiency and electromagnetic conductive and radiative noise from an experimental point of view, comparing with three-phase voltage source hard-switching inverter. View full abstract»

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  • An architecture for wireless extension of PROFIBUS

    Page(s): 2369 - 2375 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (594 KB) |  | HTML iconHTML  

    Industrial communication systems and fieldbus systems can benefit in many ways from wireless LAN technology. However, the large amount of already deployed fieldbus LANs motivates to focus on wireless extensions of existing fieldbus systems, allowing to run wireless and wired stations in the same fieldbus LAN. There exist different architectural options for the coupling of wireless stations to a wired fieldbus LAN. For the PROFIBUS, a well-known and standardized fieldbus system we present and motivate a specific coupling architecture, the virtual ring extension. In this architecture the lower layer protocols of the PROFIBUS (medium access control layer and link layer) are not used on the wireless side. Instead, a set of specifically tailored protocols is used, which allows to take the error behavior of wireless channels into account, which is significantly different from that of wired channels. The key elements of this architecture are presented and some operational aspects are discussed in more detail. View full abstract»

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  • A genetic algorithm based neural-tuned neural network

    Page(s): 2423 - 2428 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (383 KB) |  | HTML iconHTML  

    This paper presents a neural-tuned neural network, which is trained by genetic algorithm (GA). The neural-tuned neural network consists of a neural network and a modified neural network. In the modified neural network, a neuron model with two activation functions is introduced. Some parameters of these activation functions is tuned by neural network. The proposed network structure can increase the search space of the network and gives better performance than traditional feedforward neural networks. Some application examples are given to illustrate the merits of the proposed network. View full abstract»

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  • Power conversion concepts for advanced autonomy and reliability electric scooter

    Page(s): 2883 - 2888 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (490 KB) |  | HTML iconHTML  

    A novel conversion system has been developed for a medium size electric scooter. Particular attention has been paid to batteries size optimization, to minimize drawbacks on scooter weight for given autonomy, analogous to that of a combustion engine competitor. High-performance power conversion structures and management strategies have been adopted according to, and full exploitation of high-energy density Li-Ion cells has been reached. Safety and mobility guarantee against eventual cells collapse have been faced both in terms of mechanical bounding and fault by-pass. Plug-in PFC battery charge make the proposed conversion system a completely standalone solution for light EV traction. View full abstract»

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  • Approaches to analytical analysis of active filter behaviour

    Page(s): 2017 - 2022 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (451 KB)  

    The paper deals with sample structures of active filters. The aim is the evaluation of an analytical model for analysing the influence that filter parameters have on behaviour of the device. The results give also the opportunity to carry out useful guidelines for filter design. By means of well-known mathematical procedures the traditional mathematical model of active filter is arranged to be suitable of an analytical solution of the system of differential equations. Solutions are expressed as a function of the time and by means of inner parameters. Therefore it is possible a simple evaluation of the influence of the parameter values on output filter currents. View full abstract»

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  • Advancement and trends of power electronics for industrial applications

    Page(s): 3021 - 3022 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (275 KB)  

    Power electronics has become an indispensable core technology in supporting modern industry and improving our living standards. This article shows the benefits of the power electronics for the society. Also, advancement and trends of power electronics for industrial applications are shown. View full abstract»

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  • A novel two-stage high-power-factor low-frequency HID electronic ballast

    Page(s): 2607 - 2612 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (382 KB) |  | HTML iconHTML  

    A novel two-stage, high-power-factor electronic ballast used to drive high-intensity discharge lamps is proposed in the paper. The ballast consists of a flyback-type input current shaper to achieve power factor correction and a half-bridge-type inverter to supply the lamp with low-frequency square-wave current. Owing to its low-frequency operation, no acoustic resonance occurs. The features of the ballast are cost-effective, low total-harmonic-distortion (THD), high power factor (PF>0.99). Operational principles, design equations and simulated results of one 70-W HID lamp operating at 400 Hz switching frequency with 110 V-rms line input voltage are presented. View full abstract»

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  • A hybrid optical current sensor for power system metering and protection

    Page(s): 2517 - 2521 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (405 KB) |  | HTML iconHTML  

    This paper proposes a novel design of hybrid optical current sensor (HOCS). A bulk-optic glass sensing head is simplified, which combines with a conventional sampling current transformer (CT) to form the HOCS. In this design, a technique of coefficient adjustment is adopted. Using the stationary outputs of sampling CT to adjust the outputs of bulk-optic sensing head, the transient and stationary performance and long-term stability of the HOCS have been improved effectively. The output interface of HOCS is suggested and introduced for new and existing substations. The test results are given, especially the optical sensing parts. A prototype of HOCS has been designed and constructed. Initial tests show that it meets requirements for power system metering and protection. View full abstract»

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  • Non-linear control of a paralleled half-bridge complementary-control converter system with a single-wire current sharing

    Page(s): 2586 - 2590 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (317 KB) |  | HTML iconHTML  

    This paper proposes the design of a non-linear control of paralleled half-bridge with complementary-control (HBCC) converters. A large-signal model of the paralleled system is presented in order to deduce the non-linear control structure that is applied to the converters. Current sharing among converters is achieved by using a single-wire current-share scheme. The control behavior of the system has been tested with proper simulations for the paralleled system. View full abstract»

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  • WISENET - TinyOS based wireless network of sensors

    Page(s): 2363 - 2368 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (490 KB) |  | HTML iconHTML  

    WISENET is a wireless sensor network that monitors the environmental conditions (such as light, temperature, and humidity) of labs and offices in ECE department at Bradley University. This network is comprised of nodes called "motes" that form an ad-hoc network to transmit this data to a computer that functions as a server. The server stores the data in a database where it can later be retrieved and analyzed via a Web-based interface. Firmware used in motes is based on TinyOS that was developed in the University of California, Berkeley. View full abstract»

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  • Shared radio system for reclosers control

    Page(s): 2376 - 2380 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (414 KB) |  | HTML iconHTML  

    Reclosers are typically used in the power electric plants to protect the system against temporary faults caused by natural effects (e.g., lightning, wind, trees) or permanent faults. Monitoring and controlling reclosers could be an expensive task depending on the type of reclosers that are employed. A simple way to perform these tasks is by using radio communication capabilities. This paper describes a system to control a net of reclosers over a shared radio based system. A main computer allows monitoring all system status by a GIS (geographical information system) based software that facilitates the user operation. View full abstract»

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  • Stable sufficient conditions of a class of fuzzy dynamic systems

    Page(s): 2405 - 2409 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (302 KB)  

    The stability of a class of fuzzy dynamic systems is analyzed. The stable sufficient conditions are proved for the continuous-time case and discrete-time case respectively. And the efficiency of the theorem is shown by the stability analysis of the inverted pendulum. View full abstract»

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  • Maximum-power-point tracking method of photovoltaic power system using single transducer

    Page(s): 2350 - 2355 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (375 KB) |  | HTML iconHTML  

    This paper proposes a maximum-power-point tracking (MPPT) method of a photovoltaic power system with less transducer count. A unique feature of this method is capability to seek the maximum power point, using only a single transducer implemented in a switched dc-dc power converter, i.e., a current transducer or a voltage transducer. Output power of the converter can be estimated with an average value and ripple amplitude of the reactor current or the capacitor voltage detected in the converter. The output power obtained from only the current or the voltage information allows seeking the maximum power point on the basis of a common hill-climbing method. In this paper, not only a theoretical aspect of the proposed method is described, but also several experimental results are presented to prove feasibility of the method. View full abstract»

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  • Design, construction and performance of a buck-boost converter for an ultracapacitor-based auxiliary energy system for electric vehicles

    Page(s): 2889 - 2894 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (470 KB) |  | HTML iconHTML  

    This paper describes step by step the process of designing, constructing and testing a bidirectional buck-boost converter. This converter is conceiving to be used as a controlled energy-transfer-equipment between the main energy source of an electric vehicle (a battery pack in this case) and an auxiliary energy system based on ultracapacitors. The converter is able to transfer energy in both directions, at rates of more than 40 kW. The battery pack's nominal voltage is 330 V, while the ultracapacitor's voltage depends on their state of charge (SOC), ranging from 100 V to 300 V. Equations governing current transfer and current ripple are analyzed. These equations will be used as guidelines for the control system design and smoothing inductor size requirement. The topology used is a buck-boost configuration. Special care had to be taken in designing the smoothing inductor and managing thermal loses, for these are critical to the overall performance. The inductor constructed, rating l.5 mH, is capable of transferring 200 A for several minutes with low loses and no core saturation (air core was used). A special water-cooled heatsink was designed and constructed, with a very low volume of less than 900 cc and a thermal resistance of less than 0.011°C/W. The control system was implemented on a TMS320F241 DSP from Texas Instruments, which consists in two control loops. The first one controls the converter's current, using as a reference the value obtained from the second loop, which controls the ultracapacitors state of charge (SOC). Criteria ruling this second loop are not discussed in this paper. Finally, some experimental results of the overall system are displayed. View full abstract»

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  • Voltage recovery of grid-connected wind turbines after a short-circuit fault

    Page(s): 2723 - 2728 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (474 KB) |  | HTML iconHTML  

    A simulation model of a MW-level wind turbine with dynamic slip control and pitch control is developed in the simulation tool of PSCAD/EMTDC and stability investigations are carried out with respect to a short circuit fault in the external power system. After the fault has been cleared, the voltage at the wind turbine terminal has to be re-established, and the wind turbine should restore its normal operating condition. Controlling the generator slip and pitch angle can adjust the electromagnetic torque and the aerodynamic torque of wind turbine, which helps to rebuild the voltage at the wind turbine terminal. Simulation results prove that dynamic slip control and pitch control are effective methods to improve the voltage and maintain power system stability. View full abstract»

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  • Modeling and synthesis of human growth hormone secretion mechanism using CAD tools

    Page(s): 2429 - 2434 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (463 KB) |  | HTML iconHTML  

    In this paper we present a hardware realization of a simplified human growth hormone (HGH) secretion mechanism. The mechanism is developed into a flowchart and then modeled using hardware descriptive language (HDL). HDL behavioral modeling is implemented to simulate the behavior of the mechanism on the computer's screen. After verifying the simulation results, computer aided design (CAD) tools are used to synthesize the mechanism onto Xilinx FPGAs chip. The chip is tested by inputting signals with values corresponding to the concentration of GHRH and the concentration of SRIF. A user-selected output pins on the chip show the concentration of HGH and the concentration of IGF-I. The outputs are compared with those generated by the simulation. Both the simulation and the chip generate identical patterns. We conclude that the chip mimics the HGH mechanism. The chip after synthesize is a stand-alone system that does not need a computer for operation. The chip operates on a real time basis. View full abstract»

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  • Developing an IEEE 1451.2 compliant sensor for real-time distributed measurement and control in an autonomous log skidder

    Page(s): 2482 - 2487 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (489 KB) |  | HTML iconHTML  

    The IEEE 1451 family of standards was created to resolve the issues and problems associated with the proliferation and the heterogeneity of sensor networks. This paper will discuss the approach taken in the implementation of an IEEE 1451.2 microcontroller-based STIM in developing a suite of smart sensors for use in an autonomous vehicle. The autonomous vehicle sensor network environment was initially developed outside of the IEEE 1451 standard hence it would provide a very good benchmark system for a comparative analysis of the use of a standardized approach to sensor network development and conventional non-standardized approach. This paper also lends its voice to the importance and usefulness of the IEEE 1451 standards, which even though has been well applauded, has not enjoyed a very wide use. View full abstract»

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  • PID control incorporating RBF-neural network for servo mechanical systems

    Page(s): 2789 - 2793 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (376 KB) |  | HTML iconHTML  

    This paper presents a combined control scheme, comprising of the well-known PID controller augmented with a radial basis function neural network (RBFNN) for the control of servo mechanical systems. A second-order linear dominant model is considered with an unmodeled part of dynamics that is possibly nonlinear and time-varying. The PID part of the controller is designed to stabilize the dominant model. The RBFNN is used to compensate for the deviation of the system characteristics from the dominant linear model to achieve performance enhancement. The advantage of this combined control scheme is that it can cope with strong nonlinearities in the system while still using the PID control structure which is well-known to many control engineers. View full abstract»

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  • Evaluation of the low-frequency neutral-point voltage oscillations in the three-level inverter

    Page(s): 2179 - 2184 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (448 KB) |  | HTML iconHTML  

    The nearest vectors to the reference vector are commonly used in space-vector modulation strategies. The main advantages of these modulation strategies are the low switching frequencies of the devices, the good output voltage spectra and the low EMI. However, when these techniques are applied to the three-level neutral-point-clamped inverter, low-frequency oscillations appear in the neutral-point voltage for some operating conditions. As a result, the value of the DC-link capacitors must be increased in order to attenuate such oscillations. In this paper, these amplitudes are quantified for two modulation strategies that use nearest vectors to the reference vector. Owing to the nondimensional variables used in the analysis, the information provided will help for the calculation of the DC-link capacitors in a given specific application. Simulated and experimental examples are presented. View full abstract»

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