Fiche : [REVUE680]

Titre : EPE Journal, European Power Electronics and Drives, Volume 16, N° 1, 2006.

Cité dans : [DIV322]  Les revues EPE Journal et EPE Newsletter, février 2011.

EPE Journal Volume 16-1
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EPE Journal Volume 16-1 - Editorial

The Word of the President
Nordic Workshops on Power and Industrial Electronics
EPE Journal Volume 16-1 - Papers

Voltage Sag Response of PWM Inverters for Variable-Speed Wind Turbines
Evaluation of Wind Farm Layouts
A Current-Source Active Power Filter with a New d.c. Filter Structure
Diode Recovery Characteristics Considerations for Optimizing Performance & Cost of Continuous Mode Boost PFC Converters
Vector Control of an Induction Motor Fed by a PWM Inverter with Output LC Filter
Fuel Cells for Electric Power Generation: Peculiarities and Dedicated Solutions for Power Electronic Conditioning Systems

EPE Journal Volume 16-1 - Editorial
The Word of the President [Details]
By M. Jufer

The election of a new EPE Association President is the occasion for a reflexion on the future of this association.

Nordic Workshops on Power and Industrial Electronics [Details]
By T. Undeland

The short history of NORPIE....

EPE Journal Volume 16-1 - Papers
Voltage Sag Response of PWM Inverters for Variable-Speed Wind Turbines [Details]
By R. Ottersten; A. Petersson; K. Pietiläinen

The voltage sag response of PWM inverters is analyzed for a candidate dc-link voltage control system. It is shown that the voltage sag response is mainly determined by the dynamics of the dc-link voltage and the control system. PWM inverters are found to be robust against voltage sags, but the remaining grid voltage limits the maximum active power that can be delivered to the utility grid.

Evaluation of Wind Farm Layouts [Details]
By S. Lundberg

In this paper, layouts of various large-scale wind farms, using either AC or DC to transfer the generated power, are investigated. The criterion used to evaluate the different layouts is the energy production cost, which is defined as the total investment divided with the total energy production of the wind farm. To determine the energy production and the total investment, loss and cost models for the components in the wind farm are used and the most important ones are presented in this paper.
The investigation shows that a wind farm with series connected DC wind turbines seems to have the best potential to give the lowest energy production cost, if the transmission distance is longer than 10-20 km.

A Current-Source Active Power Filter with a New d.c. Filter Structure [Details]
By M. Salo

The main drawback of the current-source active power filter is the heavy and bulky d.c. side filter. The large d.c. filter is needed to store the energy of the compensated harmonic components. In this paper a new smaller d.c. filter structure is proposed for the current-source active power filter. In the presented d.c. filter structure the energy of the most important harmonics are stored in resonant circuit which makes it possible to decrease the overall size of the filter. The function of the proposed dc filter structure is examined with both simulations and experimental tests.

Diode Recovery Characteristics Considerations for Optimizing Performance & Cost of Continuous Mode Boost PFC Converters [Details]
By S. Basu; T. Undeland

This paper explores ways, including the use of SiC diodes, to increase the efficiency and switching frequency of continuous mode Boost PFC Converters. The dependence of electrical and thermal performances of these PFC circuits on the characteristics of the power switching devices is studied. By making measurements on a practical 1000 W PFC circuit prototype, this paper shows as to how every specific application would need an unique design solution to optimize the cost and performance of a PFC circuit.

Vector Control of an Induction Motor Fed by a PWM Inverter with Output LC Filter [Details]
By J. Salomäki; J. Luomi

This paper introduces a control method for an induction motor that is supplied by a PWM voltage source inverter through an LC filter. A cascade control structure is employed and a full-order observer is used to estimate the system states. Thus no additional voltage or current measurements are needed for the vector control of the motor. Two alternative methods are presented for the observer gain selection. Simulation and experimental results confirm the functionality of the proposed control method.

Fuel Cells for Electric Power Generation: Peculiarities and Dedicated Solutions for Power Electronic Conditioning Systems [Details]
By F. Profumo; A. Tenconi; M. Cerchio; R. Bojoi; G. Gianolio

The Fuel Cells (FCs) output power is usually generated at low DC voltage. The output voltage is not constant and it depends on the operation conditions. Furthermore, the FC dynamic response is slower than the transients typically requested by loads; hence, in many applications, the FC generators must be interfaced with the loads and the other possible energy/power sources. For these reasons, the FC stack output power and/or the batteries/supercapacitors input/output power must be conditioned by means of an electronic power converter. The purpose of the paper is to present the main issues related to the conditioning of FC power output; in particular, considering the specific requirements of the interface electronic converters in the two most important applications: micro distributed generation (or cogeneration) and the transportation systems. The paper mainly discusses the basic circuit topologies of the DC/DC converters dedicated to the FC power conditioning, in particular considering the Proton Exchange Membrane FC technology.

Five-Level Inverter Topology for Induction Motor Drives With Common-Mode Voltage Elimination in Complete Modulation Range [Details]
By P. N. Tekwani, R. S. Kanchan, K. Gopakumar, A. Vezzini

Common-mode voltage (CMV) generated by different topologies of the pulse width modulated (PWM) inverters causes shaft voltage, bearing current and ground leakage current in the induction motor (IM) drive system. Consequently the premature mechanical failure (fluting) of machine bearings and conducted electromagnetic interference (EMI) are observed in the multilevel PWM inverter fed IM drive systems. A five-level inverter topology with switching state combination selection strategy for PWM control is proposed for an IM drive for complete elimination of CMV in the entire operating range of the drive, including over-modulation. The proposed scheme is based on a dual five-level inverter fed open-end winding IM drive structure. Each individual five-level inverter of the proposed drive is formed by cascading a three-level neutral point clamped (NPC) inverter with two conventional two-level inverters. Hence, the proposed individual five-level inverter offers simple power-bus structure with less number of power diodes as compared to the conventional NPC five-level inverter. The proposed open-end winding IM drive structure requires nearly half the dc-link voltage and provides increased number of redundant switching state combinations as compared to a single five-level NPC inverter fed conventional IM drive. The proposed CMV elimination scheme is experimentally verified on a 1.5 kW openend winding IM drive.

A Space Vector PWM Technique for Symmetrical Six-Phase Voltage Source Inverters [Details]
By D. Dujic; A. Iqbal; E. Levi

Six-phase a.c. motor drives are usually supplied from two-level six-phase voltage source inverters (VSIs), which are controlled using appropriate PWM techniques. Most of the existing work applies to the asymmetrical six-phase VSI, supplying an asymmetrical a.c. machine (two three-phase windings shifted in space by 30° degrees) with two isolated neutral points. However, it has been shown recently that a symmetrical six-phase induction machine (equidistant spacing of all six-phases, with 60° spatial displacement between any two consecutive phases) offers the same quality of performance as the asymmetrical machine, provided that good quality current control and an adequate PWM technique are utilised for the symmetrical six-phase VSI (Fig. 1) control. Since this requires sinusoidal VSI output voltages (neglecting the PWM ripple), a space vector PWM technique (SVPWM) is described in this paper, such that sinusoidal or at least nearsinusoidal output voltages are generated across the whole range of the available output voltage fundamental for the sixphase load with a single neutral point. Operation of the SVPWM scheme is investigated by extensive experimentation and time-domain waveforms and spectra are given for inverter leg, phase-to-neutral, line-to-line and common mode voltages, as well as for the load current, for a variety of operating conditions. Total voltage harmonic distortion (THD) is also calculated using experimental results and is used as a figure of merit in evaluation of the quality of performance of the SVPWM schemes.

Hybrid circuit breaker test bench [Details]
By G. Bats; P. Ladoux; J.M. Blaquière; M. Francis

The target application of the Hybrid Circuit Breaker presented in this paper is a 6.6 kV/60 Hz network for an electric ship. This Hybrid Circuit Breaker is based on a series association of IGCTs (Integrated Gate Commutated Thyristors) and a fast mechanical switch. In this new topology, thanks to the IGCT turn off control, the fault current is strongly limited and the mechanical switch, turned off at zero current, provides the voltage sustaining. To validate the principle of this Hybrid Circuit Breaker, the authors propose a test bench that can provide a 50 Hz sinusoidal short circuit current with a 18 kA-peak value and a maximum di/dt of 20kA/ms. This test bench displays interesting results and validates many key points of the new topology.

Simple Control of Photovoltaic Generator Systems with High-Speed Maximum Power Point Tracking Operation [Details]
By Y. Toshiya; O. Katsumi; M. Osamu

A simple control method for photovoltaic power generation systems is proposed. This achieves very-high-speed maximum- power-point tracking (MPPT): the controller finds out the optimal operating point within 2 milliseconds. Although this control method is based on the so-called “perturb-and-observe method”, the perturbing signal generator for MPPT operation is not necessary; switching ripples by the DC/DC converter are used as the perturbing signal. This controller measures the photovoltaic array power and tracks the optimal point with consideration of dynamic characteristics of the arrays. The proposed controller is cost effective because it can be implemented by a simple analog circuit; the controller is simplified in comparison with the conventional methods. The high performance of the proposed method is verified by experiment.

Comparison of the Induction Motors Stator Fault Monitoring Methods Based on Current Negative Symmetrical Component [Details]
By A. Lebaroud; A. Khezzar; A. Bentounsi; G. Clerc

This paper presents a survey of the diagnosis methods detecting the stator faults of the induction machines without modeling. The fault signature is based on the analysis of the negative sequence symmetrical component of the current. Two approaches are described and compared: the spectral analysis of the signature using the Discrete Fourier Transforms (DFT), the Short-time Discrete Fourier Transform (SDFT), the Gortzel algorithm and the synchronous demodulation of the current space vector. The theoretical principles of these methods are presented and their performances compared. The main purpose of this study lies in the investigation of the computational tools dedicated to the diagnosis and minimization of computing time. These methods are applied to an induction machine of 1.1 kW.

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