EPE Journal Volume 16-2 
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EPE Journal Volume 16-2 - Editorial
EPE Journal Volume 16-2 - Papers



 EPE Journal Volume 16-2 - Editorial 

Invitation to EPE-PEMC 2006 in Portoroz (Slovenia)  [Details]
By K. Jezernik
The editorial of EPE Journal volume 16-2, April - June 2006, "Invitation to EPE-PEMC 2006 in Portoroz (Slovenia)", written by Prof. Dr. Karel Jezernik, the EPE-PEMC 2006 Conference Chairman


 EPE Journal Volume 16-2 - Papers 

Anti-slip/skid Re-adhesion Control of Electric Motor Coach Based on Disturbance Observer and Sensor-less Vector Control  [Details]
By S. Kadowaki; K. Ohishi; I. Miyashita; S. Yasukawa

When the adhesion coefficient between rail and driving wheel decreases, the electric motor coach has slip phenomena. We have already proposed the anti-slip re-adhesion control system based on disturbance observer. This system has the fine torque response for one driving wheel driven by one inverter-fed induction motor. However, the bogie of electric motor coach has four driving wheels driven two induction motors. These induction motors connected in parallel are often driven by one inverter. In order to realize the anti-slip and anti-skid re-adhesion control system for the bogie of electric motor coach, this paper proposes a new re-adhesion control method based on disturbance observer and speed sensorless vector control.

Study of an Electrolytic Capacitor Model as a function of temperature  [Details]
By F. Perisse; P. Venet; G. Rojat; J. M. Rétif

With to their large capacity and their low price, electrolytic capacitors are used in many fields of power electronics, mainly for the filtering and energy storage functions. Their characteristics move strongly according to frequency, and temperature. Temperature variation is generally not taken into account in electrical simulation software. In many applications such as transport, industry, space one or in military applications, the variations of temperature are significant. A model taking into account these variations seems to be essential. In this study we propose to define a simple model taking into account characteristics variations of the electrolytic capacitors according to the temperature and frequency. A method of identification is proposed based on genetic algorithm. A good compromise between simplicity and precision is one of the objectives of this study.

This identification was carried out for large electrolytic capacitor of rated value 4,7mF/500V. The comparison between measurements and the model for different temperatures gives good results. The model used in this paper has a precision for temperatures lower than 0°C much better than a standard model. Moreover the limited number of elements used in this model, allows an easy integration in simulation software.

A Controller Design Method of Bilateral Control System  [Details]
By T. Tsuji; K. Natori; H. Nishi; K. Ohnishi

Haptic sense is indispensable for skillful operation in a telerobotic system. Bilateral control attracts considerable interest because it transfers the haptic sense to a remote place. Although it is simply composed of two manipulators, its design is complicated. This study proposes an idea that provides a new framework on design of a bilateral control system. The idea is to design the bilateral control system based on a "function", a minimum component of a system role. It enables simple and explicit design for various tasks. The features of the proposed method provide a way to design an adjustable system. Experimental results show the validity of the proposed method.

Hybrid Excitation Synchronous Alternator Connected to a Diode Rectifier with a Resistive Load  [Details]
By Y. Amara; A. H. Ben Ahmed; E. Hoang; L. Vido; M. Gabsi; M. Lécrivain

id excitation synchronous machines are electric machines with two excitation circuits, one with permanent magnets and another wound. The study presented in this paper discusses operation characteristics of a hybrid excitation alternator connected to a diode rectifier with a resistive load. A parametric study is undertaken to evaluate the effect of hybrid excitation alternator parameters on the full load performances. Particular attention is devoted to the influence of hybridization ratio on the generation system’s global efficiency. The hybridization ratio is a particular parameter of hybrid excitation machines. It reflects the ratio between the permanent magnets excitation flux and the wound excitation flux. Measurements on a hybrid excitation alternator allow validating the parametric study and show improvement brought by hybrid excitation.

Non-interacting Control of Web Forces and Cut-Off Register Errors in Rotary Printing Presses with Electronic Line Shafts  [Details]
By G. Brandenburg; S. Geißenberger; A. Klemm

Replacing the mechanical line shaft, which is necessary for the synchronous drive of the printing units of rotary offset printing presses, through an "electronic line shaft" consisting of highly precise speed- and angle-controlled AC motors a multi-variable control system is formed which offers much more degrees of freedom than before to control important process variables. Until now it was not possible to simultaeously control web tensile forces and register errors, especially the cut-off register error, which are coupled with each other. On the basis of an extended mathematical process model which has been derived it was possible to find algorithms for a non-interacting, stable and simultaneous control of these two variables in the same or in different paper sections using the angular velocities of non-printing nips as actuating variables. The new control scheme was implemented on the level of the electronic drive controls and tested with a commercial press for illustration printing. This results in a considerably faster, more accurate and wearless control, compared to the use of register rollers which are state of the art. Due to this the amount of waste paper is significantly reduced. Furthermore, the operation of the press is simplified because the tensile force profile can automatically be preselected dependent on the paper grade and converted to set point values for the machine control. These innovations increase the productivity of the plant.

A Two Stage Power Converter Topology for High Voltage DC Power Supplies Under Pulsed Loads  [Details]
By N. Vishwanathan; V. Ramanarayanan

High voltage power supplies for radar applications are investigated, which are subjected to high frequency pulsed load (above 100 kHz) with stringent specifications (regulation < 0.01%, efficiency >85%, droop < 0.5 V/micro-sec.). As good regulation and stable operation requires the converter to be switched at much higher frequency than the pulse load frequency, transformer poses serious problems of insulation failure and higher losses. The solution to this problem as a single stage converter is very difficult. In converters operating at high voltage and high frequency, the insulation failure of high voltage transformer is very common. Skin and proximity effect result in higher power losses. Because of high turns ratio, the winding capacitance results in delays and current spikes. Hence a two-stage converter has been proposed. It isolates the HV transformer from high frequency requirement of the regulation. Its block diagram is shown in the following figure. One stage of it, namely, Base power supply (BPS), operates at low frequency and produces majority of the output voltage and power. The other one, namely, fast power supply (FPS), operating at high frequency and low output voltage supplies the remaining power and takes care of the transient variations of line and load and provides the required regulation. The final output voltage is obtained as sum of the outputs of BPS & FPS. Each of the BPS & FPS use phase modulated-series resonant converter as the power-processing unit with zero voltage switching (ZVS). This topology also allows load frequency variation over a certain range.

Power Devices - Future Trends, Future Requirements  [Details]
By J. Lutz

The EPE Conference Dresden 2005 included a special session "Trends in power devices" with papers from power device manufacturing companies, followed by a workshop in which 9 leading specialists from the industry discussed under the title "Future Requirements to Power Devices". This discussion, under participation of an audience, consisting mainly from users of power devices, gives the opportunity to show some trends and to give a feeling, what is to be expected from modern power devices in the next years.

International Conference on Power Electronics and Intelligent Control for Energy Conservation - PELINCEC 2005  [Details]
By M. P. Kazmierkowski; W. Koczara; L. M. Grezsiak

The PELINCEC 2005 Conference organized by Institute of Control and Industrial Electronics was held in the historical Main Building of Warsaw University of Technology, Poland, constructed in the second half of 19th century, and has focused on promotion of Power Electronics and Intelligent Control for Energy Conservation. This Conference was co-sponsored by EPE Association.