Fiche : [REVUE558]

Titre : EPE Journal, European Power Electronics and Drives, Volume 14, N° 4, 2004.

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

AECCTECH_NET, a network of University Laboratories and Industry R&D Laboratories to face the challenges of the European Commission’s 6 th Framework Programme

EPE Journal Volume 14-4 - 1 - Editorial
See you in 2005 in Dresden! [Details]
By B. Sneyers
The Editorial of EPE Journal Volume 14-4.

EPE Journal Volume 14-4 - 2 - Applications
Electrical energy - a normal trading commodity? [Details]
By W. Leonhard
For more than a hundred years our private and public life has been
advanced by two electrotechnical achievements: the instantaneous
availability of practically unlimited energy and the free flow of
information. They have immensely widened the range and scope of our
activities: one is informed (or believes to be) allowing almost global
omnipresence, at the same time they lend us forces millionfold exceeding
our own.

EPE Journal Volume 14-4 - 3 - Papers
A New Single Phase AC/AC-Multilevel Converter for Traction Vehicles
Operating on AC Line Voltage [Details]
By M. Glinka; R. Marquardt
A new converter concept for direct connection to the power line of AC-fed
traction vehicles will be introduced. This concept contains a new single
phase AC / AC - modular-multilevel-converter (M2LC) and a concentrated
medium-frequency transformer. A design for multi-system operation will be
investigated that can operate on an AC 15 kV/162/3Hz as well as an AC 25
kV/50 Hz power line. The new single phase M2LC, enabling four quadrant
operation, forms the core of this converter concept. The basic
characteristics of this new converter will be introduced. Simulations and
analytical investigations underline the attractiveness of this new M2LC
converter. This versatile traction converter concept stands out due to its
modularity, its superior control characteristics as well as its good
adaptability to various traction drives. Therefore, the single phase M2LC
has the potential to replace the conventional transformer of future AC-fed
traction vehicles.

Current Control of Utility-Connected Two-Level and Three-Level PWM
Inverters [Details]
By S. M. Abu Sharkh; M. A. Abu-Sara
This paper discusses the design of a digital current controller for
three-phase utility-connected 2-level and 3-level PWM inverters with
output LCL filters in which the filter capacitors are connected to the dc
link rails. The controller has a two-loop feedback structure, with an
additional feedforward loop to compensate for utility voltage harmonic
disturbance. A detailed analysis of the effect of the controller
microprocessor time delay on the stability and transient response of the
controller is presented. Analytical and simulation results are presented
for both the 2-level and the 3-level inverter systems, demonstrating the
effectiveness of the proposed controller in producing good quality current
with low THD. The results confirm that using a 3-level inverter has the
advantage of halving the current ripple in the filter’s main inductors, at
the expense of extra inverter power devices and electronic hardware and
software complexity. Experimental results for a 2-level inverter system
are also presented.

Reduction of Bearing Currents in inverter fed drive applications by using
Sequentially Positioned Pulse Modulation [Details]
By J. Zitzelsberger; W. Hofmann
The phenomenon of bearing currents is known for a long period. Especially
those which are caused by magnetic asymmetries have been investigated
since the beginning of the 20th century. Nowadays new kinds of bearing
currents can be observed in inverter fed induction drives. Investigations
done on these effects show that the switched operational mode – especially
of voltage source inverters – causes a high frequency common mode voltage
(CMV). This voltage supplies the common mode circuit of an electrical
machine in which the bearings are a part of. Therefore, to reduce the
occurrence of bearing currents it is necessary to avoid or - at least - to
minimise the common mode voltage in drive applications fed by voltage
source inverters. A novel principle for such a purpose is the space vector
based modulation with sequentially positioned pulses (SPP). With this
modulation it is possible to reduce both the number of edges within the
CMV and its amplitude to a great extent without influencing the modulation
index. The present paper summarises the ideas which stand behind the
principle of SPP and gives an overview over the major dependences from
characteristics of the drive system. Moreover, the functionality and the
compatibility to standard inverter fed drives is shown by means of
simulations and measurements.

Parameter Independant Phase Tracking Method for Sensorless Control of PWM
Rectifiers [Details]
By P. Szczupak; M. Linke; R. Kennel
In this paper a new parameter independent sensorless control strategy for
a voltage oriented controlled (VOC) threephase pulsewidth modulated (PWM)
power supply rectifier is presented. This control method requires neither
the measured AC-line voltages nor any accurate circuit parameters for
estimation purposes. Furthermore there is no need for additional test
signals. There are no additional hardware requirements with respect to the
standard drive invertersavailable in the market which usually are not
equipped with AC-side voltage sensors. It will be seen that the
calculation demand for the sensorless approach is negligible in comparison
to the requirements for the control itself. This approach makes use of the
slow varying AC-line voltage - the sample frequency of the inverter is at
least ten times higher. The principle of the proposed method is explained,
and its effectiveness is proven experimentally.

Thermal Analysis of Squirrel-Cage Induction Machine [Details]
By O. I. Okoro
Undesirable effects such as loss of dielectrical property of the
insulating material and thermal bending of the rotor and consequent loss
of eccentricity among others result when the thermal limit of an
electrical machine is exceeded. Due to these problems, the temperature in
electrical machine must be properly monitored and specified within certain
limits to reflect the mechanical, electrical and environmental conditions
in which the machine will operate. This paper shows how thermal network
model can be used to predict the temperatures of squirrel-cage induction
machine parts at no-load and rated load. The thermal measurements carried
out show that the proposed thermal model is capable of calculating the
temperatures in the test machine with good accuracy during no-load and
rated load operations.

Control Strategy for a Novel Combined Operation of Long Stator and Short
Stator Linear Drive System [Details]
By B. Yang; H. Grotstollen
To realize a highly flexible propulsion system, a combined drive of long
stator and short stator linear motors is applied to operate vehicles of
the NBP railway system (Neue Bahntechnik Paderborn, i.e. New Rail
Technology of Paderborn in English) (Fig. 1). The control strategy of this
combination is described in detail in this paper. The presented
experimental results, which show the control performance, are based on
extensive theoretical investigations.

Power-Electronic Interface for a Supercapacitor-Based Energy-Storage
Substation in DC-Transportation Networks [Details]
By A. Rufer; Ph. Barrade; D. Hotellier
A Power-electronic interface for supercapacitive-storage based substation
in DC-transportation networks is proposed, which allows to feed as a
current-source in any voltage conditions of the line. The system has been
designed as a compensation-substation to be placed at weak points like
end-of-line stations, and can replace supplementary feeding substations. A
dedicated power-electronic converter with associated control system is
proposed, for the stabilization of the voltage level at the point of
coupling. Practical results are also presented, which have been recorded
from a reduced scale prototype.

EPE Journal Volume 14-4 - 4 - AECCTECH_NET
AECCTECH_NET, a network of University Laboratories and Industry R&D
Laboratories [Details]
By B. Sneyers
AECCTECH_NET, a network of University Laboratories and Industry R&D
Laboratories to face the challenges of the European Commission's 6th and
future 7th Framework Programmes

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