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Power Electronics Specialists Conference, 2001. PESC. 2001 IEEE 32nd Annual

Date 17-21 June 2001

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  • 2001 IEEE 32nd Annual Power Electronics Specialists Conference [front matter]

    Publication Year: 2001 , Page(s): i - xxxiv
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    Freely Available from IEEE
  • Author index

    Publication Year: 2001 , Page(s): 2229 - 2234
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  • A novel maximum power point tracking technique for PV panels

    Publication Year: 2001 , Page(s): 1970 - 1975 vol. 4
    Cited by:  Papers (4)  |  Patents (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (336 KB) |  | HTML iconHTML  

    A novel technique for efficiently extracting maximum power from photovoltaic (PV) panels is presented. The power conversion stage, which is connected between a PV panel and a load or bus, is a SEPIC or Cuk DC/DC converter operating in discontinuous inductor-current or capacitor-voltage mode. The method of locating the maximum power point (MPP) is based on injecting a small-signal sinusoidal perturbation into the switching frequency and comparing the AC component and the average value of the panel terminal voltage. Apart from not requiring any sophisticated digital computation of the panel power, the proposed technique does not approximate the panel characteristics and can globally locate the MPP under wide insolation conditions. The tracking capability has been verified experimentally with a 10 W solar panel under a controlled experimental setup. Performances under different insolation levels and a large insolation level change will be studied View full abstract»

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  • Auto protected ZVS-ZCS half bridge with parallel power regulation

    Publication Year: 2001 , Page(s): 1988 - 1993 vol. 4
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (584 KB) |  | HTML iconHTML  

    ESTEC has developed and patented in 1988 a ZVS-ZCS topology which is essentially a current fed resonant push-pull or half-bridge. This topology provides only voltage adaptation. When voltage regulation is needed, a buck converter is usually put up-front. The disadvantage of this combined concept is to handle the full power through two stages and to request an input filter, while its advantage is to offer a protection feature. The concept presented in the paper tries to combine, in the ZVS-ZCS topology alone, the protection aspects and the regulation capability in a defined input voltage range and does not request an additional input filter due to the current fed nature of the topology. Test results of breadboarding activities are presented View full abstract»

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  • Construction and modeling of integrated LCT structure for PFC resonant converter

    Publication Year: 2001 , Page(s): 1949 - 1954 vol. 4
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (768 KB) |  | HTML iconHTML  

    This work presents the application of a new methodology to obtain a geometric and frequency dependent model of integrated LCT magnetic structure. The modeling procedure is based on the use of 3D axisymetric finite element analysis (FEA) solver to obtain the value of the magnetic and electric fields, as well as the power losses. The main advantages of this procedure is that both of electric, magnetic and coupled effects are considered. Also all geometrical and frequency effects are taken in to account. This simulation takes also in to account displacement current and is coupled with an external circuit. This procedure, named "a magneto-dynamic formulation" was applied to toroidal structure. Measured impedance response of the realized LCT prototype is compared with that obtained by simulation. Two 300 watt experimental converters using conventional discrete and integrated LCT structures were constructed, evaluated and compared View full abstract»

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  • Online rotor bar breakage detection of three phase induction motors by wavelet packet decomposition and artificial neural network

    Publication Year: 2001 , Page(s): 2209 - 2216 vol. 4
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (800 KB) |  | HTML iconHTML  

    Online detection algorithm for induction motor rotor bar breakage is presented using a multi-layer perception network (MLP) and wavelet packet decomposition (WPD). New features of rotor bar faults are obtained by wavelet packet decomposition of the stator current. These features are of multiple frequency resolutions and obviously differentiate the healthy and faulty conditions. Features with different frequency resolutions are used together with the speed slip as the input sets of a 4-layer perceptron network. The algorithm is evaluated on a small three-phase induction motor with experiments. The laboratory results show that the proposed method is able to detect the faulty conditions with high accuracy. This algorithm is also applicable to the detection of other electrical faults of induction motors View full abstract»

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  • Dynamic optimization of bidirectional topologies for battery charge/discharge in satellites

    Publication Year: 2001 , Page(s): 1994 - 1999 vol. 4
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (336 KB) |  | HTML iconHTML  

    In this paper bidirectional topologies of DC-DC PWM switching converters for battery charge/discharge regulation in satellites are analyzed. The aim of the investigation is to find parameter conditions to obtain a minimum phase behavior of the injected/absorbed current in the bus which guarantees the stability of the current control View full abstract»

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  • Dissipativity-based adaptive and robust control of UPS in unbalanced operation

    Publication Year: 2001 , Page(s): 1862 - 1867 vol. 4
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (496 KB) |  | HTML iconHTML  

    In this paper we investigate the output voltage control for three phase uninterruptible power supply (UPS) using controllers based on ideas of dissipativity. To provide balanced sinusoidal output voltages even in the presence of nonlinear and unbalanced loads, we first derive a dissipativity-based controller using a conventional αβ (fixed frame) representation of system dynamics and a frequency-domain representation of system disturbances. Adaptive refinements have been added to the controller to cope with parametric uncertainties. Second, based on the structure of the first adaptive controller and avoiding estimation of one of the parameters, we propose a controller, which leads to an LTI closed loop system and which is directly connected to synchronous frame harmonic voltage control. For the proposed solution, a sufficient condition in terms of the design parameters is presented to guarantee stability of the desired equilibrium and robustness against some parameter uncertainties. Finally, simulation and experimental results on a three-phase prototype show the effectiveness and advantages of the proposed approach View full abstract»

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  • Common-mode noise reduction in DC-DC converters by common-source type active-clamp technique

    Publication Year: 2001 , Page(s): 1773 - 1778 vol. 4
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (504 KB) |  | HTML iconHTML  

    Several topologies of active-clamped DC-DC power converters have been proposed previously. This paper compares the common-mode-noise properties of the conventional type using a pulse transformer for a gate driver and the common-source type proposed recently. Using a noise measuring system composed of LISN (line impedance stabilization network) and EMSCAN (electromagnetic scanning system), it has been clarified that the common-source type has the superiority on noise reduction View full abstract»

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  • A very simple DC/DC converter using piezoelectric transformer

    Publication Year: 2001 , Page(s): 1755 - 1760 vol. 4
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (600 KB) |  | HTML iconHTML  

    Piezoelectric transformers (PTs) have lately been looked upon as an attractive solution to reduce size and weight in AC/DC converters. This paper presents a topology that includes such a device while minimizing the number of additional components required for an adequate performance. An 8-watt AC/DC adapter (110 VAC, 12 VDC ) operating at frequencies around 500 kHz is obtained using this topology View full abstract»

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  • Spacecraft electrical power subsystem design utilising the ESA-ESTEC concurrent design facility (CDF)

    Publication Year: 2001 , Page(s): 2000 - 2005 vol. 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (464 KB) |  | HTML iconHTML  

    ESA's general definition for the term 'concurrent engineering' is as follows: development of an engineering design team covering all relevant disciplines as from the initiation of a project; with the team working and communicating in a single environment, to establish a system design within a short period of time and in a more consistent way with respect to other approaches. This design approach offers distinctive gains due to greater consistency over a shorter time period. This article describes the above-mentioned approach applied in the area of the spacecraft electrical power systems design View full abstract»

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  • A novel time ratio controlled high frequency soft switching inverter using 4th generation IGBTs

    Publication Year: 2001 , Page(s): 1868 - 1873 vol. 4
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (528 KB) |  | HTML iconHTML  

    This paper presents a novel prototype of active voltage-clamping capacitor-assisted soft switching PWM inverter operating at a constant frequency variable power (VPCF) regulation scheme, which is suitable for consumer high-power induction-heating cooking appliances. New generation IGBT with a trench gate is particularly improved in order to reduce conduction loss due to its lower saturation voltage characteristics. The soft switching load resonant and quasiresonant inverter using the latest IGBTs designed specially, is evaluated from an experimental point of view View full abstract»

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  • PDP sustainers with reduced current stress and sensitivity to parasitic and distributed components

    Publication Year: 2001 , Page(s): 1779 - 1784 vol. 4
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (480 KB) |  | HTML iconHTML  

    This paper presents three improved plasma display panel (PDP) sustainers with reduced current stress and sensitivity to parasitic and distributed components. In the paper, a useful cell equivalent circuit model is first introduced, and a widely used sustainer is then reviewed, on which three improved ones are proposed. The proposed sustainers can reduce currents through switches and sensitivity to parasitic and distributed components along its conduction paths. Derivation and operating principle of the proposed sustainers are addressed in detail. In addition, their related gaseous discharge mechanism in PDP cells is also presented. Hardware measurements have verified the feasibility of the proposed sustainers View full abstract»

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  • Sensorless drive of permanent magnet linear motors using modified Kalman filter

    Publication Year: 2001 , Page(s): 2009 - 2013 vol. 4
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (432 KB) |  | HTML iconHTML  

    This paper presents a novel method to eliminate the need for a position sensor in permanent magnet linear motor (PMLM) drives, by using modified Kalman filter estimation algorithm. Due to end effects, the PMLM must operate at high speed dynamics, and its lowest speed can go down to zero velocity. This problem is overcome by using sinusoidal open loop current control for speeds below 0.1 m/s. The Kalman filter is engaged when the speed goes above 0.1 m/s. In the investigation, the control and estimation algorithm, together with the PMLM are simulated in MATLAB and SIMULINK. After that, the drive system is implemented in hardware with a DSP controller board. Results show that the Kalman filter is capable of estimating system states accurately and reliability without mechanical sensors. Together with the low-speed open-loop control, the PMLM can be operated under trajectory tracking mode without any position sensors View full abstract»

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  • Current-feedback magnetic multivibrator with feedback-controlled frequency compensation circuit

    Publication Year: 2001 , Page(s): 1851 - 1856 vol. 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (328 KB) |  | HTML iconHTML  

    An improved current-feedback magnetic multivibrator having a constant frequency of oscillation is proposed. Current-feedback magnetic multivibrators are noise-proof, reliable, and highly efficient. However, the frequency of oscillation varies with the load. The proposed multivibrator can compensate the oscillation frequency by feedback control. This circuit succeeds to advantages of self-excited multivibrators View full abstract»

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  • Bearing current path and pulse rate in PWM-inverter-fed induction

    Publication Year: 2001 , Page(s): 2025 - 2030 vol. 4
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (576 KB) |  | HTML iconHTML  

    In this paper, the authors present quantitative experimental results of the amplitude and rate of bearing current pulses emerging in common use PWM drives configurations. Based on measurement data and a simulation model, it has been shown that a whole path of bearing currents is closed inside of the motor and that these currents do not flow to a grounding arrangement as had been suggested in previous works View full abstract»

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  • Analysis and modeling of a Rosen type piezoelectric transformer

    Publication Year: 2001 , Page(s): 1761 - 1766 vol. 4
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (376 KB) |  | HTML iconHTML  

    This paper presents an equivalent circuit model for a Rosen type piezoelectric transformer. Transmission line equations for both the thickness and longitudinal modes with a clamped boundary condition on one end of each section are developed. The partial expansion theorem is used to convert the transmission line model into an equivalent circuit model. Losses are introduced in a post-processing step using the experimental value of mechanical quality factor. L'Hospital's rule is used to simplify the circuit near a resonance frequency. Experimental results confirm the existence of multimode resonance and anti-resonance behavior View full abstract»

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  • An advanced induction machine model for predicting inverter-machine interaction

    Publication Year: 2001 , Page(s): 2043 - 2052 vol. 4
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (752 KB) |  | HTML iconHTML  

    The classical qd induction motor model typically used in drive simulations is very inaccurate in predicting machine performance, except perhaps for the fundamental component of the current and average torque near rated operating conditions. Predictions of current and torque ripple are often in error by a factor of two to five. This work sets forth an induction machine model specifically designed for use with inverter models to study machine-inverter interaction. Key features include stator and rotor leakage saturation as a function of magnetizing flux, distributed effects in the rotor circuits, and a highly computationally efficient implementation. The model is considerably more accurate than the traditional qd model, particularly in its ability to predict switching frequency phenomena such as current and torque ripple. The predictions of the proposed model are compared to those of a standard qd induction motor model and to experimental measurements for a 50 hp induction motor drive View full abstract»

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  • Continual on-line training of neural networks with applications to electric machine fault diagnostics

    Publication Year: 2001 , Page(s): 2224 - 2228 vol. 4
    Cited by:  Papers (15)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (384 KB) |  | HTML iconHTML  

    An online training algorithm is proposed for neural network (NN) based electric machine fault detection schemes. The algorithm obviates the need for large data memory and long training time, a limitation of most AI-based diagnostic methods for commercial applications, and in addition, does not require training prior to commissioning. Experimental results are provided for an induction machine stator winding turn-fault detection scheme that uses a feedforward NN to compensate for machine and instrumentation nonidealities, to illustrate the feasibility of the new training algorithm for real-time implementation View full abstract»

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  • Energy control of multi-switch power supplies; an application to the three-phase buck type rectifier with input filter

    Publication Year: 2001 , Page(s): 1831 - 1836 vol. 4
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (488 KB) |  | HTML iconHTML  

    The first part of the paper presents a systematic method for the modeling of power electronic networks with multiple switches using the classical Lagrangian framework. The main advantage of this method is its structured and general character compared to other methods. The power of working with Lagrangian dynamics, especially when very large networks have to be analyzed, is that Kirchhoff's voltage law is given in advance, while the interconnection structure is based on Kirchhoff's current laws only. The physical nonlinear structure of these systems is revealed and can be used for feedback controller design and stability analysis. The second part concentrates on the proposed passivity-based controller design technique based on the Lagrangian structure. Besides its physical significance, this approach appears to be an interesting alternative when dealing with the problem of input filter influences in power electronic systems. With this technique, artificial damping is injected such that the impedances of the in- and output filters can be matched. In this way power is not reflected and resonance problems, especially during the start-up and transient conditions, are minimized. A unity power factor passivity-based control algorithm for the three-phase buck type rectifier with an input filter is proposed that does not require current sensors but only measurements of the capacitor voltages View full abstract»

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  • 1D analytical procedure to calculate magnetic components parameters

    Publication Year: 2001 , Page(s): 2131 - 2136 vol. 4
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (592 KB) |  | HTML iconHTML  

    This work presents a procedure valid to solve small signal tests of magnetic components (inductors and multiwinding transformers) by means of analytical expressions. The method is based on the use of the transmission line 1D model of the magnetic component. Since the test can be analytically solved, the procedure allows skipping the use of electrical simulators in order to solve the small signal analysis. The procedure is valid for general cases, and therefore it can be implemented using mathematical packages (Mathcad, Madab, Mathematica, etc.) or using programming languages. The method has been validated by means of comparisons with actual measurements as well as FEA solvers results View full abstract»

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  • Nonlinear control strategy applied to a shunt active power filter

    Publication Year: 2001 , Page(s): 1877 - 1882 vol. 4
    Cited by:  Papers (13)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (408 KB) |  | HTML iconHTML  

    This paper presents a new nonlinear decoupling control method of a three-phase three-wire voltage source shunt active filter. The currents injected by the active filter are controlled in the synchronous orthogonal dq frame using a decoupled feedback linearization control method. The reference currents are extracted from the sensed nonlinear load currents by applying the synchronous reference frame method. The voltage level of the DC side is regulated using an output feedback linearization control. Integral compensators are added in both current and voltage loops in order to eliminate the steady state errors due to system parameters uncertainty. Simulation results confirm the performance considered theoretically for the shunt active filter View full abstract»

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  • Quasi-active power factor correction: the role of variable inductance

    Publication Year: 2001 , Page(s): 2078 - 2083 vol. 4
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (360 KB) |  | HTML iconHTML  

    Three variable inductors have been evaluated to provide power factor correction in a 150 W AC/DC power supply. The constant air-gap inductor meets the harmonic limits, but is larger, bulky and more costly. The swinging inductor is the least suitable because these is a very sharp drop in the effective inductance characteristic over a small current range, this has the effect of introducing large spikes of current which in turn degrade the power factor. It has been shown that the sloped air-gap (SAG) inductor has the most suitable inductance versus current characteristics to provide power factor correction to meet harmonic limits over a wide power range View full abstract»

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  • High efficiency 3-phase input quasi-single-stage PFC-DC/DC converter

    Publication Year: 2001 , Page(s): 1785 - 1789 vol. 4
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (360 KB) |  | HTML iconHTML  

    This paper presents a novel quasi-single-stage topology for a 3-phase input AC/DC power converter with power factor correction (PFC). There are soft-switching conditions of all switches, low voltage stresses on the output diodes, and smaller input and output filters in this topology. A quasi-wave prototype with 380 VAC+/-30% input, 40-60 VDC output was built and its efficiency was about 93%. The input harmonic current meets IEC61000-3-2 Class A standards, and the total harmonic distortion level is about 10% at rated input voltage. Experimental results show that the novel AC/DC converter with PFC has the advantage of low cost, small size, light weight and high efficiency View full abstract»

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  • Circuit simulator models for the diode and IGBT with full temperature dependent features

    Publication Year: 2001 , Page(s): 2171 - 2177 vol. 4
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (456 KB) |  | HTML iconHTML  

    The problems faced in generating analytical models for the IGBT and power diode are devising correct equations and determining realistic boundary conditions, especially for 2D features, while ensuring convergence of the models. These issues are addressed in this paper in relation to the temperature dependent modelling of IGBTs and diodes View full abstract»

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