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Power Electronics Specialists Conference, 2008. PESC 2008. IEEE

Date 15-19 June 2008

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Displaying Results 1 - 25 of 860
  • 39th IEEE annual power electronics specialists conference

    Page(s): I
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  • Welcome message

    Page(s): II
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  • IEEE PELS administrative Committee 2008

    Page(s): III
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  • [Breaker page]

    Page(s): IV
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  • Contact information

    Page(s): V - VII
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  • 39th IEEE PESC 2008 digest reviewers

    Page(s): VIII - XXIII
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  • Conference registration

    Page(s): XXIV - XLVII
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  • [Blank page]

    Page(s): XLVIII
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  • Table of contents

    Page(s): XLIX - XCII
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  • Session MO1: Matrix converter cechnologies I

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  • Hybrid matrix converter topologies: An exploration of benefits

    Page(s): 2 - 8
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (788 KB) |  | HTML iconHTML  

    Matrix converters are direct AC/AC power converters that can operate with sinusoidal output/input voltage/currents without the need of passive components to store energy, which means that they are grid friendly and have a great weight/volume reduction potential. Hybrid power converters are arrangements of two different type of converters, a main one, processing the bulk of the power interconnected with an auxiliary one, more versatile, processing only a fraction of the power, with the purpose of improving the main converter performance and/or mitigate some of its drawbacks. This paper will review a few hybrid matrix converter solutions developed to address the main drawbacks of the matrix converter technology: the limited (les0.866) voltage transfer ratio and the sensitivity to power supply disturbances. View full abstract»

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  • Predictive torque control with input PF correction applied to an induction machine fed by a matrix converter

    Page(s): 9 - 14
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (778 KB) |  | HTML iconHTML  

    A new modulation and control strategy for a matrix converter induction motor drive is presented in this paper. A discrete model of the converter, motor and input filter is used to predict the behaviour of torque, flux and input power of the system. The switching state that optimizes the value of a quality function is selected. The predictive control method, referred to as predictive torque control for matrix converters is introduced in this paper, including a strategy to control the input power factor. One of the fundamental differences that the proposed approach presents is that it considers all valid voltage vectors generated by a matrix converter, including rotating vectors that are neglected by most control strategies. View full abstract»

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  • A predictive control for a matrix converter-fed permanent magnet synchronous machine

    Page(s): 15 - 21
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (284 KB) |  | HTML iconHTML  

    Many research efforts have been dedicated to matrix converters for several years. As major technological issues are now solved, this structure will widespread in industrial applications, in particular with AC motors. Current control is a key issue for AC motor drives, so many control schemes have been proposed. Some of them proposed at first for inverters, were applied to matrix converters. Among algorithms used with inverters, predictive control shows very good performances. In this paper a new control scheme is proposed for a matrix converter- fed permanent magnet synchronous machine. Literature about matrix converter technology and control and about predictive control for inverter-fed AC machines is reviewed. The proposed predictive control principle, the model of the whole machine - converter and the cost-function are detailed. The method offers a trade-off between the quality of motor currents and input power factor. Finally experimental results are reported. The feasibility and the effectiveness of the proposed method is assessed. View full abstract»

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  • Investigation of two-step commutated resonant matrix converter supplying a contactless energy transmission system

    Page(s): 22 - 28
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1098 KB) |  | HTML iconHTML  

    This paper investigates a novel matrix converter technology, the two-step commutated resonant matrix converter loaded with a contactless energy transmission system. Based upon a basic description of the converter, the built prototype and measurements are presented. While the main benefit of the used commutation strategy - the minimization of commutation steps and independence from the sign of the load current - could be proved, several parasitic elements influence the commutation and surprisingly lead to some soft-turn off of the semiconductors. Detailed investigations make the individual parasitics and their special influence visible. View full abstract»

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  • Session MO2: Sensorless motor control I

    Page(s): 29
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  • Sensorless observer system for induction motor control

    Page(s): 30 - 36
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (426 KB) |  | HTML iconHTML  

    Controlled ac drives without speed sensors of the motor shaft are in increasing demand. Eliminating the speed sensor increases the reliability of the overall system and reduces its cost. The proposed method employs electrical quantities, the stator current and stator voltage space vectors, as input signals in a closed-loop observer to estimate the rotor speed. The sensorless observer is built around the fundamental model of the ac machine; the redundancy of different structures is exploited to endorse the system robustness. Issues of concern are drift in the signals of the input channels of the observer, deviation of machine parameters from their nominal values, and operation at very low stator frequency. The performance of the overall control system is evaluated at steady-state and dynamic operating conditions. Both simulation and experimental results are provided to support the reliability of the proposed sensorless observer. View full abstract»

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  • Sensorless stator flux oriented control of IMS using a new Delayed-State KF-based algorithm

    Page(s): 37 - 42
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (673 KB) |  | HTML iconHTML  

    This paper proposes a new reduced delayed-state Kalman filter (DSKF) based algorithm to realize the speed-sensorless vector control of induction motor. This algorithm estimates the stator flux components in the stationary reference frame, using the derivatives of the stator flux components as mathematical model and the stator voltage equations as observation model. The DSKF-based algorithm accurately estimates the stator flux components in transient operations because the derivative of the absolute stator flux value is taken into account as a forcing term in the mathematical model, so that applications both in flux rising operations and in field weakening region are possible. The estimated stator flux components are used for stator field orientation control (SFOC) without rotor speed sensor. Experiments show that the sensorless control scheme using the new DSKF-based algorithm requires a low computational effort, is stable and effective also at low speeds. View full abstract»

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  • Parameter sensitivity analysis of two low-cost sensorless induction motor drives

    Page(s): 43 - 49
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (268 KB) |  | HTML iconHTML  

    The paper presents a detailed sensitivity analysis comparison between two existing low-cost sensorless solutions for induction motor drives. The first solution is a V-type approach, in which the inverter voltage references are calculated from the machine equations instead of obtained as the output of PI current regulators. The scheme is obtained from a standard field oriented control drive by successive approximations. The second solution is an open- loop speed estimator, based on the machine equations only, used in conjunction with a field oriented control drive with speed and current closed loops. An analytical sensitivity analysis has been carried out first, looking for the behaviour of the two schemes in presence of single motor parameter mismatch. Both schemes have been implemented in laboratory prototypes, and their performances have been tested in different conditions. The results of the comparison are discussed in details. A side value is the generality of the proposed analysis method, which can be applied as a standard comparison tool for control schemes evaluation. View full abstract»

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  • A novel speed sensorless direct torque and flux controlled interior permanent magnet synchronous motor drive

    Page(s): 50 - 56
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (300 KB) |  | HTML iconHTML  

    This paper investigates a modified direct torque control (DTC) scheme based on space vector modulation (SVM) for interior permanent magnet synchronous motor (IPMSM) drives. Closed-loop control of both the torque and stator flux linkage are achieved by using two proportional-integral (PI) controllers. The reference voltage vectors are generated by a SVM unit, which replaces the switching table in the conventional DTC scheme. Whilst retaining its main advantages, the new DTC method features reduced torque and flux ripples as compared to the classical DTC. A speed estimator based on the stator flux linkage and torque angle is incorporated into the proposed DTC scheme. Simulation and experimental results confirm the effectiveness of the proposed method. View full abstract»

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  • Session MO3: Photovoltaic energy systems I

    Page(s): 57
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  • Novel grid-connected non-isolated converters for photovoltaic systems with grounded generator

    Page(s): 58 - 65
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (295 KB) |  | HTML iconHTML  

    In the photovoltaic branch, transformerless inverters are nowadays the majority of the systems installed in Europe, mainly because of the higher level of efficiency and reduced cost and weight when compared with their counterparts with transformer, whether this concerns low- frequency or high-frequency models. Nevertheless, some limitations arise for the operation of such systems, mainly regarding the fact that normally the panel output cannot be grounded, what is, for example not allowed in USA. Non- grounded operation of panels composed of some new cells technologies can bring undesired effects like cell aging and efficiency reduction. In addition, security matters regarding leakage current due to the panel parasitic capacitance are also a common problem in such systems. In order to address such matters, this paper proposes a novel DC-DC converter for the application in transformerless photovoltaic systems. As main characteristic, it allows the grounding of the negative output of the photovoltaic array and provides a bipolar output voltage. Following the proposition of the circuit, the analysis and evaluation will be performed. A prototype was built and the experimental results are presented in the end. View full abstract»

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  • A robust power decoupler and maximum power point tracker topology for a grid-connected photovoltaic system

    Page(s): 66 - 69
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (633 KB) |  | HTML iconHTML  

    The exponential growth in the number of photovoltaic (PV) system installations verifies that solar power technology has become one of the promising energy resources. This paper introduces new control scheme and converter topology for low to medium power PV applications. Proposed topology provides independent MPPT and power decoupling without the use of bulky electrolytic capacitors. The grid-connected output stage is a current source inverter with a modified modulation strategy to inject a low harmonic current into the grid at unity power factor. Simulation results are presented to show the effectiveness of the proposed method in terms of MPPT, power decoupling and power injection into the grid at a high quality. View full abstract»

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  • Improved photovoltaic conversion chain with interleaved method

    Page(s): 70 - 75
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (900 KB) |  | HTML iconHTML  

    This paper presents a parallel connection of three-cell interleaved boost converters used as an adaptation stage dedicated to photovoltaic applications. Indeed, this structure associated to a MPPT control improves the efficiency and reliability of a photovoltaic power conversion chain. An additional current sharing control has been incorporated to assure a uniform distribution of power between each DC-DC converter. Every voltage and current ripples present on the load and photovoltaic (PV) source implying the switch stresses are reduced with this technique compared to a classical structure. Finally; experimental results show that the proposed technique can be used for impedance matching of a PV array. View full abstract»

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  • Photovoltaic-battery powered DC Bus system for common portable electronic devices

    Page(s): 76 - 80
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (268 KB) |  | HTML iconHTML  

    Renewable energy sources based on photovoltaic along with battery-based energy storage necessitate power conditioning to meet load requirements and/or be connected to the electrical grid. The power conditioning is achieved via a DC-DC converter and a DC-AC inverter stages to produce the desired AC source. This is also the case even when the load is of DC type such as the typical electronic devices which require AC adaptors to be powered from the AC mains. The paper presents a hybrid photovoltaic-battery powered DC bus system that eliminates the DC-AC conversion stage resulting in lower cost and improved efficiency. It is also shown experimentally that the AC adaptors associated with the various commonly used electronic devices can be reused with the proposed system and in some cases offer higher operating efficiencies when powered from a DC bus instead. A novel high-gain modified boost converter is also introduced with several times higher voltage conversion ratio than the conventional boost converter topology. This arrangement results in higher DC bus levels and lower cable conduction losses. Moreover, the voltage stress on the modified boost converter power switch is within half the output voltage. Experimental results taken from a laboratory prototype are presented to confirm the effectiveness of the proposed approach. View full abstract»

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  • Session MO4: Semiconductor device technologies I

    Page(s): 81
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