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Power Electronics and Motion Control Conference (EPE/PEMC), 2010 14th International

Date 6-8 Sept. 2010

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Displaying Results 1 - 25 of 340
  • Speed sensorless asynchronous motor drive with inverter output LC filter

    Page(s): T5-1 - T5-8
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (896 KB) |  | HTML iconHTML  

    In this paper a speed sensorless ac drive with inverter and output LC filter is proposed. A nonlinear, decoupled field oriented control algorithm with a flux and speed close-loop observer is used. In spite of using LC filter on the inverter output, the sensorless system works precisely. That result are obtained as a result of the appropriate estimation and control system use. The theory, simulation, and experimental results are presented. View full abstract»

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  • Characteristics of high voltage cables and motors by impulse transmission

    Page(s): T6-1 - T6-5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (760 KB) |  | HTML iconHTML  

    This contribution presents results of high frequency measurements on low voltage and medium voltage cables and motors. Bode diagrams and Nyquist diagrams are presented and real parameters are determined. The comparison with calculation results and with data sheet parameters is down. View full abstract»

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  • SEPP-ZVS high frequency inverter for induction heating using newly developed SiC-SIT

    Page(s): T2-1 - T2-6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1544 KB) |  | HTML iconHTML  

    SiC-SIT power semiconductor switching devices has an advantage that its switching time is high speed compared to those of other power semiconductor switching devices. We adopt newly developed SiC-SITs which have the maximum ratings 800V/4A and prepare a breadboard of a conventional single-ended push-pull(SEPP) high frequency inverter. This paper describes the characteristics of SiC-SIT on the basis of the experimental results of the breadboard. Its operational frequencies are varied at from 100 kHz to 250 kHz with PWM control technique for output power regulation. Its load is induction fluid heating systems for super-heated-steam production. View full abstract»

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  • Active learning Power Electronics: A new assessment methodology

    Page(s): T14-1 - T14-5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1261 KB) |  | HTML iconHTML  

    A new student assessment methodology in the context of active learning Power Electronics is offered. The study summarizes the benefits and drawbacks of different qualitative and quantitative assessment practices. Throughout the paper, examples of assessments from Tallinn University of Technology are highlighted. View full abstract»

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  • A toolbox to design and study electric drives

    Page(s): T5-142 - T5-148
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1347 KB) |  | HTML iconHTML  

    The paper introduces an effective toolbox for engineers, researchers and students to design and study electric drives. The described package eDrive includes a database of motors, power converters, and gears, an object-oriented simulator, a virtual signal generator, the module of the torque/current, speed, and path controllers, as well as the suitable visual interface. The system provides for the development, tuning, and investigation of electric drives with current, speed, and position adjustment in the open-loop and closed-loop modes of operation. View full abstract»

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  • Six-level single-leg flying capacitor converter voltage balancing dynamics analysis

    Page(s): T2-7 - T2-14
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1115 KB) |  | HTML iconHTML  

    Natural voltage balancing property is an attractive feature of a flying capacitor converter. In this paper, time domain approach based on stitching piece-wise analytical solutions for consecutive switching intervals is applied to a six-level single-leg flying capacitor converter. The small parameter approximation analysis yields physically meaningful, simple, and accurate expressions for average voltage balancing dynamics giving an in-depth insight into parameters and carrier frequency impact for carrier-based phase-shifted DC PWM. View full abstract»

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  • Topology aspects in EtherCAT networks

    Page(s): T1-1 - T1-6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1089 KB) |  | HTML iconHTML  

    Fieldbus networks based on Ethernet become an inevitable part of factory automation systems. The number of installed nodes has increased over the last few years. Therefore, efficient network planning sets new challenges for today's engineers. This paper shows major aspects of topology planning in industrial networks based on EtherCAT protocol. View full abstract»

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  • FPGA hybrid controller for unity power factor

    Page(s): T13-1 - T13-6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (584 KB) |  | HTML iconHTML  

    With introduction of recent standards on limiting harmonic pollution of electrical power distribution system, three-phase PWM converters are being considered as prime candidates for interfacing high-power electronic equipment to power supply lines. In these applications, converters can provide input currents without distortion and with unity power factor. In this paper, a unified discrete event model is given for power electronic circuits based on a hybrid system theory. Based on this model, FPGA switching control strategy for a three phase converter is developed. The functionality of a three phase converter is discussed from a discrete-event point of view. Recently developed hybrid based approach for modeling of discrete event systems is applied for modeling, simulations and implementation of a power factor control, protection and steering functionality three-phase converter. A DSP / FPGA based digital control platform for converter system, built in the laboratory, is presented and discussed. View full abstract»

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  • Grid integration strategy for multifunctional grid front-end based distributed generation

    Page(s): T11-1 - T11-7
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (856 KB) |  | HTML iconHTML  

    In the future, distributed generation (DG) needs to be enabled to actively participate in control of grid voltage and frequency. An efficient grid integration strategy is required to interconnect the DG to conventional power systems and to improve the power quality and reliability (PQR) as well. The main task of the interconnected system is to control and maintain frequency and voltage of the power system in an acceptable range. This task has been currently operated using synchronous generators in many interconnected power systems. The power dispatch, frequency control and voltage control, power exchange and power optimization are already managed in conventional power supply systems. Therefore, the control strategy of the conventional power systems can be adapted to DG technologies through their interface unit to the grid, namely the inverter. The inverter is the primary interface unit between the energy source and the grid. This paper presents an adaptable and flexible control strategy for inverters as grid front-end based DG. The proposed control strategy can be a basic strategy to implement the DG system into existing conventional power systems. View full abstract»

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  • Coupled feedback and feedforward control of hybrid power filter

    Page(s): T13-7 - T13-10
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (516 KB) |  | HTML iconHTML  

    A coupled feedback and feedforward control strategy of the parallel hybrid power filter (HPF) is presented in the paper. It features a small sensitivity against a disturbed supply voltage system and enables us to set grid phase currents in the phase with respective voltages. The experimental data agree with theoretical expectations. View full abstract»

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  • The calculation of eddy current losses in tube wound high current transformer windings

    Page(s): T12-1 - T12-5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1888 KB) |  | HTML iconHTML  

    In this paper an efficient water cooled power transformer with an application to high frequency induction heating is presented. The secondary side of the transformer is realized by a water cooled copper tube with rectangular cross section. The main advantage of the construction is the combination of copper band and copper tube windings. This winding configuration allows the interleaving of the windings with the direct consequence of considerably reduced copper losses due to the well known proximity effect. Furthermore a very low leakage inductance of the transformer is obtained. Finite element simulations are conducted to investigate the copper losses and the leakage inductance with respect to different winding arrangements. The model is finally verified by means of experimental data drawn from a realized prototype. View full abstract»

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  • Model based predictive speed control of a drive system with torsional loads — A practical approach

    Page(s): T5-149 - T5-156
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1319 KB) |  | HTML iconHTML  

    This paper presents the selection and the implementation of a model based predictive speed control - the Generalized Predictive Control - for a drive system with torsional loads. In drive applications where long or thin drive shafts are used torsional oscillations can occur due to the finite torsional stiffness of the shafts material. These unwanted oscillations can stress both mechanical and electrical drive components. Further, when shaft torsion is neglected during the control synthesis, the achievable bandwidth of the speed control is dramatically reduced. To avoid these problems a model based predictive speed control is designed that takes the torsional shaft behavior into account. To ensure a practical and realizable speed control, an aposteriori actuating value limitation in addition to the classical GPC approach is presented. The predictive speed control is verified in simulations and measurements. Additionally to that a comparative study to a PI based speed control is carried out. View full abstract»

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  • System on Chip cores for protection and commutation of a matrix converter

    Page(s): T2-15 - T2-21
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1993 KB) |  | HTML iconHTML  

    This article deals with the implementation of the commutation and protection of the matrix converter (MC) via some hardware blocks (cores) implemented in an FPGA. Thanks to the computational capacity of the cores, processing time is reduced. This allows a response in real time improving the safety of the MC. View full abstract»

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  • A new control scheme of the three-phase four-wire PWM converter under unbalanced and distorted input conditions

    Page(s): T12-6 - T12-12
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (499 KB) |  | HTML iconHTML  

    This paper presents circuit model and mathematical model of power for three-phase four-wire PWM converter under unbalanced and distorted input voltages. Based on the system model, a new positive-negative-zero sequence current reference control method is proposed to eliminate of harmonics of DC link voltage to alleviate the stress of the DC-link capacitor and to reduce the harmonics of input AC currents. The results show that the proposed control method has better performances than the conventional single positive sequence control under unbalanced and distorted input voltages. View full abstract»

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  • Adaptive PDF speed control for motion control

    Page(s): T5-9 - T5-14
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1273 KB) |  | HTML iconHTML  

    This paper proposes two model reference adaptive PDF speed control methods. Following from the structure of model reference parameter adaptive control it makes it easier to reach overshootless. The approaching block diagram of the model reference signal adaptive control can be seen as an extended version of the PDF controller. View full abstract»

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  • Extreme dynamics on eCAM linear drive

    Page(s): T5-114 - T5-119
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (700 KB) |  | HTML iconHTML  

    The aim of this paper is a description of using linear drive for cyclic traversal motion. The maximum acceleration is up to 22G, the frequency of motion is 3.2 Hz. Therefore the linear motor is controlled by electronic CAM. The electronic CAM optimization is discussed in this paper. View full abstract»

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  • Boost converter efficiency optimization in wind turbine

    Page(s): T3-1 - T3-5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (893 KB) |  | HTML iconHTML  

    A method for efficiency optimization of boost converter applied in wind turbine with permanent magnet generator (PMG) is proposed in this paper. This method gives the best results when output power of generator is less than rated value. Its validation is verified through simulation and experimental results. View full abstract»

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  • An investigation of the natural balancing mechanisms of cascaded active-rectifiers

    Page(s): T2-22 - T2-28
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (897 KB) |  | HTML iconHTML  

    The natural balancing processes of a 2-cell cascaded active rectifier converter is investigated in the frequency domain. Two balancing mechanisms are identified, weak and strong. Expressions for the time constant of both mechanisms are derived. The limitations and applicability of both mechanisms are discussed. The results are compared to time domain simulation results for the constant duty cycle case. Finally the measured results of a practical system operating as power factor correcting rectifier are presented. View full abstract»

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  • Cutting out the voltage oscillation influence on the control quality of a three-level inverter drive by using sliding mode

    Page(s): T3-6 - T3-12
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (560 KB) |  | HTML iconHTML  

    The paper explains basic ideas related to using sliding mode technique for elimination of the influence of the lower-frequency voltage oscillations on the control quality of a three-level inverter drive. A cutting out above-mentioned influences is based on the condition for the input dc-line voltage selection. This condition has been received by taking into account both voltage oscillations limitations. View full abstract»

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  • Analysis and design aspects of a desaturation detection circuit for low voltage power MOSFETs

    Page(s): T1-7 - T1-12
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2304 KB) |  | HTML iconHTML  

    An analysis of a desaturation detection circuit specially designed for low voltage power MOSFETs is presented and design aspects are carried out. The characteristics are a low detection threshold hysteresis, a fast shutdown reaction and a junction temperature compensation. The proposed desaturation detection circuit is described in detail and experimental results are given. The influence of the junction temperature and stray inductances of the package leads on the short circuit detection threshold are pointed out. View full abstract»

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  • Observer based identification of unbalanced magnetic pull in asynchronous motors

    Page(s): T4-1 - T4-6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1825 KB) |  | HTML iconHTML  

    This paper presents an iterative approach to identification of sources and characteristics of rotor and airgap eccentricity and, consequently, unbalanced magnetic pull (UMP) in asynchronous motors. The presented method is based on the number of mathematical modeling techniques, namely: finite elements method (FEM), Lagrangian dynamics and optimal estimation in combination with experimental measurements. View full abstract»

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  • Electric power splitter pulse rectifier control in a hybrid propulsion system

    Page(s): T4-7 - T4-11
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1106 KB) |  | HTML iconHTML  

    This paper presents a control structure proposal for output voltage control of a pulse rectifier powered from an electric power splitter with permanent magnets. This system is intended to be used in hybrid vehicles. Specific problems in this area are primarily the necessity to work in a broad range of output voltage frequencies, to provide power splitter output power limitations and to provide a significant DC output voltage increase. The control structure covers up both the full magnetic flux mode and the magnetic flux weakening mode as well. The experimental setup and experimental results obtained on a system with electric power splitter - pulse rectified - load are presented. View full abstract»

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  • Adaptive Neuro-Fuzzy Extended Kaiman Filtering for robot localization

    Page(s): T5-130 - T5-135
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (519 KB) |  | HTML iconHTML  

    Extended Kalman Filter (EKF) has been a popular approach in localization of a mobile robot. However, the performance of the EKF and the quality of the estimation depends on the correct a priori knowledge of process and measurement noise covariance matrices (Qk and RK, respectively). Imprecise knowledge of these statistics can cause significant degradation in performance. In this paper, the Adaptive Neuro-Fuzzy Inference System (ANFIS) supervises the performance of the EKF with adjusting the matrix Qk and RK. The ANFIS is trained using the steepest gradient descent (SD) to minimize the differences between the outputs of ANFIS and desired outputs. The simulation results show the effectiveness of the proposed algorithm. View full abstract»

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  • Power management approach for hybrid multi-input/multi-output converter

    Page(s): T6-6 - T6-13
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1129 KB) |  | HTML iconHTML  

    Power management scheme for a converter system with multiple inputs and outputs is presented in the paper. The hybrid control approach was applied due to the required operation in various regimes. System collects the energy from multiple sources. The operation is supported by the battery. View full abstract»

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  • Efficiency improvement of an IPMSM using Maximum Efficiency operating strategy

    Page(s): T5-15 - T5-19
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (795 KB) |  | HTML iconHTML  

    Interior permanent magnet synchronous machines (IPMSM) are preferably used for traction drives in electric vehicles. These are characterized by high efficiency and high torque as well as power density. The generation of reference currents for the field-oriented control is realized by look up tables (LUT). In these LUT the entire machine characteristic is described. The reference currents are selected on the basis of different operating strategies. The Maximum Torque Per Current (MTPC) method, which minimizes the magnitude of the current at a given torque, is the most common strategy in the constant torque range. It can be proven by measurements on a real motor that the MTPC method deviates considerably from the best efficiency under certain boundary conditions. The use of the Maximum Efficiency (ME) method increases the drive efficiency in comparison to the MTPC up to 0.3% at the same torque level. The ME characteristic however, has to be changed with the machine speed. Using the ME method, the gain of efficiency is small but it can be achieved with minor adaptions of a LUT in the machine control. View full abstract»

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