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This paper presents a main flux oriented model of an induction machine which considers the saturation in both magnetizing and leakage inductances. The model is based on a virtual air gap. With this model it is possible to simulate the saturation characteristic and the cross-saturation effect. The validity of these results is proved with measurements on a test bench. A procedure is presented that shows...
The life time of the solder joint between base plate and ceramic substrate is usually tested by passively heating and cooling the power module (thermal cycling). This provokes delamination in the solder layer. But, the silicon dies in the power module are actively heated in the application. The accelerated life time test simulating this load is power cycling. The modules commonly fail at the end of...
In this paper, a method to improve efficiency in half-bridge series resonant inverter applied to domestic induction heating is presented. Low and medium output powers required for this application implies the use of higher switching frequencies, which leads to an efficiency decrease. Asymmetrical duty cycle (ADC) modulation scheme is proposed to improve efficiency due to its switching frequency reduction...
This paper evaluates the features of a new highly modular multilevel converter topology (M2C) for medium voltage applications. Furthermore this paper will compare the M2C converter topology with existing converter topologies regarding the basic principle of operation, measurements as well as the harmonic content of the electrical output values.
In recent two decades the application of high voltage test systems using the concept of very low frequency is more and more accepted by industries. This contribution deals with the control design for a novel high voltage test system generating a true sinus test voltage of 85 kV (RMS) at 0.1 Hz based on a zero-voltage switched LCC-resonant converter and a 3-stage Cockcroft Walton voltage multiplier...
Integration of energy storage (ES) into a static synchronous compensator (StatCom) makes it possible for the StatCom to provide a certain amount of active power as well as reactive power support. The possible benefit of the additional active power support of a StatCom can be power oscillation damping capability, mitigation of phase-jump related disturbances, etc. Direct connection of an ES device...
Due to limited space availability in vehicular applications, machines with high torque density are required. One of the ways to maximize space is by reducing machine end winding length and increasing its effective stack length. This paper illustrates a general design process used for implementing non-overlapping concentrated windings an interior permanent magnet (IPM) machine for field weakening applications...
Accurate measurement of distorted, noisy and pulsed currents is still a challenge. Current transformers introduce unacceptable errors in magnitude and/or phase shift. Rogowski coils are useful for clamp-on field measurements, but can be cumbersome to use. This paper presents a transducer consisting of coreless transformer and a non-integrating electronic amplifier. Calibration of two prototype transducers,...
The usual approach to design the two current controllers for a grid-connected voltage source converter is to design the two compensation controllers for the direct path and use a feed forward component to compensate the coupling. However, this term can lead to significant errors since the associated parameters can change in time. A controller that can directly handle this coupling term is the best...
Sliding mode control of boost converter is studied. In order to improve dynamical performances with static and dynamic specifications, we propose a systematic procedure to compute the gains of the controller based on an optimization scheme. This method is applied to the control of an energy storage system based on supercapacitors technology in order to regulate the output voltage. Given a system with...
High power density power electronics converters are increasingly demanded. Generally speaking, raised switching frequency improves the power density. However, dramatically increasing frequency on the present level still depends on the advance of power electronic components in material property, packaging technique, thermal management technique and etc. This paper surveys the recent material development...
Dynamical phenomena like oscillations and instability in railway power systems have come into concern in the experts' community the recent years. In several occasions, modern advanced electrical rail vehicles have been a source for low-frequency power oscillations leading to an unstable power system due to lack of damping, and as a consequence operational problems. Traditionally the dynamical behaviour...
This paper describes design of a new control and PWM algorithms for a main drive of a multisystem locomotive with special focus on investigation into the trolley-wire current which could disturb railway safety systems. Designed control is based on rotor flux oriented vector control in Cartesian coordinates which is unusually operated due to specific PWM in whole speed range. We employ a synchronous...
This paper presents a laboratory setup for teaching basics of power electronics. The setup consists of a 3 phase transformer, a rectifier and four half-bridges. The latter can be configured as DC-DC converters (buck and full-bridge converter) or as AC-DC converters (one and three phase voltage-source inverters). Different PWM control schemes as well as on-off current control are implemented. It allows...
Skin-pass 3 of ArcelorMittal Gent has 2 tensioning devices with 5 S-rolls each that are driven with a common planetary gear system. The DC-drive and the planetary gear system will be replaced by induction machines for each individual S-roll during the future renovation. In this paper, different control strategies for load balancing are evaluated.
A new 5-level non-differential PFC topology with fault tolerant capability is presented and compared to known structures. It is derived from a 3-level double-boost PFC. The series-connection of the two low-voltage switching-cells decoupled by a single flying capacitor provides a fault-tolerant capability and a post failure operation increasing the availability of converter. The most important features...
The paper investigates the dynamic effects the coupled-inductor technique creates in a superbuck converter. The results are compared to the corresponding discrete-inductor converter. It is well known that the ripple current in an inductor can be significantly reduced by using coupled inductors. The investigations show that the transient dynamics of the converter is substantially reduced by the application...
Investigation of conducted electromagnetic interference (EMI) in AC motor drives fed by a pulse width modulated (PWM) voltage converters requires that converters', motor windings' and feeding cables' parasitic capacitances have to be taken into account. Motor voltage transients and related EMI emission are substantially correlated with resonance effects occurring in load circuits. Frequency impedance...
Nowadays the majority of electric drives work at variable speeds. In this kind of drives the electrical machines are supplied by inverters which generate modulated voltages. It is widely known that these non sinusoidal voltages cause additional current harmonics dealing to higher iron losses than with sinusoidal voltages. The iron losses affect to several design constraints as the efficiency and the...
Today, energy saving is one of the main objectives for engineers. In the case of mobile applications, energy can be saved by two different ways. First, decreasing the total masse of the system, and second, increasing the efficiency of the overall system. This paper presents an optimization strategy to design an interleaved DC/DC converter in order to find the best compromise between efficiency, weight...
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