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Three-phase inductors are crucial components for power electronic devices. The most typical measurement process of such inductors bases on three-phase power supply, but it causes many difficulties, especially in industrial or manufacturing tests. The proposed alternative is an implementation of single-phase measurements to three-phase inductors. This approach is discussed in the publication.
Large inrush currents can occur when power transformers are connected to the grid. In the past, a wide range of countermeasures has been developed whereof the application of power electronic converters recently received more attention. With hybrid transformers combining a conventional transformer with a power electronic converter, the elimination of inrush currents can be realized without considerable...
In this paper a novel axial-flux segmented rotor switched reluctance motor (AFSSRM) with a stator sandwiched by two rotors with a particular form of the segments is presented. The machine has magnetic short paths with no flux reversal and the active magnetic parts are made of soft magnetic composites. An in-wheel AFSSRM, specially intended for direct drive of light motorcycles, is designed. Electromagnetic...
In this paper an application of artificial neural controller for compensation of torque ripple in electrical drive with PMSM (Permanent Magnet Synchronous Motor) is presented. Due to cogging torque, electromagnetic torque ripple and also, current measurement error of the motor, are created a ripple of angular velocity, finally. This parasite phenomenon influence on the precision of control, especially...
The paper investigates a thermal behaviour of a DC inductor deployed in a 600 kW power converter for particle accelerators. The inductor is manufactured from electrical steel core and two magnetically coupled windings with integrated air ducts for enhanced air circulation. The thermal analysis of inductor are carried out by means of a Computational Fluid Dynamics (CFD) model and simulations. The paper...
This paper compares the air gap field, magnetic radial force and vibration between SPM and IPM machines having 6-pole/54-slot winding topology together with the identical stator but different rotor topologies. A simplified analytical method is analyzed and its results are validate by Finite element method. It is shown that the vibration of the IPM is much higher than that in SPM when motor is in on-load...
Gallium nitride (GaN) switches have superior switching performance when compared to the traditional Si technology. Therefore, GaN switches are an appealing option for power converters and electrical drives. In this paper, considerations for a high-speed electrical drive with inverter switching frequency of 1 MHz are presented, along with simulation results of the motor control of the drive.
A comprehensive energy balancing concept for the Modular Multilevel Converter (MMC) under unbalanced grid conditions was proposed. Grid supporting converters need to be able to fed unbalanced grid currents; grid failures lead to unbalanced grid voltages. Both unbalanced grid conditions generate energy unbalance inside the MMC. In order to handle these critical operating points, an analytical description...
This paper concerns the application of three-level neutral point clamped (NPC) voltage source inverter (VSI) to electrical energy conversion of the photovoltaic (PV) power plant. The grid-connected 3-phase NPC inverter is powered via the split DC-link composed of the capacitive divider (Fig. 1). It enables the usage of two DC-buses independently which can be supplied by the separated boost-type DC-DC...
In future high-voltage direct current (HVDC) systems, a large number of HVDC breakers will be required. In this paper, the influence of HVDC breakers on the transient performance of point-to-point HVDC links in both asymmetrical and symmetrical monopolar configuration with half-bridge modular multilevel converters is studied with simulations in PSCAD. As HVDC breakers, the active resonant breaker...
Due to the adverse temperature swings which normally occur in the power semiconductor devices during the start-up and deceleration periods of the motor drive system, the thermal design and control, as well as the reliability analysis of the power devices becomes crucial. In order to facilitate testing and access the loading and lifetime performances, a novel stress emulator for power semiconductor...
Constant random and wear-out failures of sub-modules (SM) within a Modular Multi-level Converter (MMC) are examined. Constant random failures are calculated using the binomial distribution formula, using a constant failure rate. Wear-out failures are calculated using discrete Markov chain modelling and Monte Carlo estimation, with the failure rate of a SM increasing with time. The results are compared...
The interaction of power electronic converters in a microgrid can introduce system instability and power quality issues. Existing investigations focus on interactions either in low frequency regions, such as the constant power load, or in very high frequency regions like electro-magnetic interference. However, interactions of power converters around their switching frequency range are not included...
Multichip power modules use parallel connected chips to achieve high current rating. Due to a finite flexibility in a DBC layout, some electrical asymmetries will occur in the module. Parallel connected transistors will exhibit uneven static and dynamic current sharing due to these asymmetries. Especially important are the couplings between gate and power loops of individual transistors. Fast changing...
This study deals with near-field probes integration onto power electronic modules for the magnetic field measurement. In this paper, electromagnetic disturbances characterization is investigated. A loop-antenna-type, its design and its modeling are detailed. The measurement obtained on a buck power converter are presented. An analysis of conducted currents within the power module is developed. Based...
A method for sensorless control of induction machines is proposed to estimate the field angle error using continuous excitation signals. Effects, which are present during a misalignment between the real world and model value, are used to estimate the error and correct it. Main flux oriented machine model equations, which take into account the magnetic anisotropies of the machine, are used to show...
Single and multi-voids position effects will be highlighted from an electrothermal viewpoint. Complementary numerical investigations will show that these effects are strongly dependent on the properties of the backside metallization of the MOSFET chip. The methodology based on a coupled analysis of electrothermal modeling and experiments that led to these conclusions will be detailed.
This paper proposes, as a control scheme of a switched reluctance motor, back electromotive force control (back-EMF control for the abbreviation) in order to reduce the vibration and the acoustic noise of a switched reluctance motor. In back-EMF control, the winding current is kept around the current reference without switching the power devices in a corresponding phase in the drive circuit by utilizing...
This paper presents an improved cascaded DC-DC resonant converter for offshore windfarms. The improvements are reduced losses and the number of components. The topology is based on the Marx principle where charged capacitors are charged in parallel and discharged in series to achieve the voltage transformation. The four inductors of the converter are designed to resonate with the capacitors to create...
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