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This work investigates the possibility to reduce the thermal stressing of high power IGBT modules in a DC-current application. Using four load current profiles as examples, two mitigation strategies are presented and their benefit to the power stack in terms of lifetime prolongation is evaluated. In the final part of the work, the investigation focuses on the relation between the shape of the load...
This article presents the efficiency analysis of a 5 MW wind turbine generating system in an all-DC wind park comprising of a permanent magnet assisted synchronous reluctance generator (PMaSynRG) system as well as an IGBT equipped forced-commutated inverter. In this article, the focus is on the NPC converter and DC-DC converter with an optimized high-frequency transformer. The total efficiency through...
This work investigates the current sharing effect of a high power Soft Punch Through IGBT module in the Negative Temperature Coefficient region. The unbalanced current sharing between two of the substrates is demonstrated for different current and temperature levels and its impact on the thermal stressing of the device is evaluated. The results indicate that the current asymmetry does not lead to...
In this paper the effect of the magnet placement on the torque generaton of an internal permanent magnet (IPM) machine used as a WEC generator is investigated. Firstly, a v-shaped IPM machine is used as an initial WEC generator and the generator operation is established for a selected wave climate, through simulations. In order to evaluate the effect of the magnet placement and configuration, four...
This paper investigates a time efficient method for estimating the iron losses in a permanent magnet motor using FEM modeling. The methodology comprises of using iteration between FEM electromagnetic simulations and Analytical state space modeling. Results show that by using fast field calculations as input to the state space model accurate mean torque calculations can be made, even during high saturation,...
This paper investigates the impact on power density of a BLDC motor using different control strategies. The simulations are carried out using 2D electromechanical FEM calculations, including the frequency converter supply. The maximum steady state output power is determined using thermal FEM calculations. The obtained results shows that an increase of 5.9% in output power can be obtained by running...
High power isolated DC-DC converters are likely to provide solutions for many technical challenges associated with power density, efficiency and reliability in potential applications such as offshore wind farms, inter-connection of DC grids, MVDC in data centers and in future solid state transformer applications. The high power medium frequency transformer (HPMFT) is one of the key elements of such...
In a modern hybrid vehicle where several switched converters are connected to a common high voltage DC-bus, current and voltage harmonics will arise due to the switching events in the inverter. In order to determine the behavior of the complete system, models that include switching characteristics, control parameters of each device and high frequency behavior of the cabling and the battery must be...
The high power medium frequency transformer (HPMFT) is one of the key elements of an isolated, bi-directional DC-DC converters in applications such as future all-DC offshore wind farms, traction and solid state transformers. This paper describes a design methodology taking into account the loss calculation, isolation requirements and thermal management. Incorporating this design methodology, an optimization...
Characterization of the conductive current associated with XLPE, found in power cables requires HVDC power supplies with very stable voltage output. The very low conductivity has led to an increased need of a more accurate measurement technique to characterize the conductive parts of dielectric materials. Commercial HVDC power supplies used for such measurements do not provide a pure DC due to the...
This article presents the result of an VSI-losses minimization technique based on multi-objective convex optimization for a salient-pole PMSM with a two-level VSI for an automotive application. The optimization, using the switching frequency as control variable, is based on a multi-objective cost function defined by the combination of VSI-losses and electromagnetic torque peak-peak ripple, analytically...
This paper proposes the combination of two sensorless control algorithms for the secure start-up and the efficient operation of a remotely-controlled PMSM. V / f control is applied during the start-up of the motor and vector control is used for operation at higher speeds. The investigated system consists of a long step-out configuration with a cable and two transformers between the PMSM and its VSD...
This article presents the result of an inverter switching loss minimization technique based on discontinuous PWM patterns for a salient-pole PMSM with a two-level voltage source inverter for an automotive application. The suggested PWM patterns are evaluated using the resulting electromagnetic torque considering peak-to-peak ripple as well as the DC-current harmonic spectra. The study focuses on high...
When operating higher up in frequency, the copper losses in transformer windings will significantly rise due to enhanced skin and proximity effect. This leads to a high need to propose and develop new methods to accurately evaluate winding losses at higher frequencies. This paper investigates the effect of different geometrical parameters at a wide range of frequencies in order to propose a pseudo-empirical...
In this paper, a hard switched and zero-voltage switching full bridge converter for high power applications are compared in terms of their losses. The important issue in designing these kinds of converters is to manage the converter parasitics. Moreover, evaluating the losses at the high frequency transformer with square wave input is another critical point in designing such a high power density converter...
In this paper, two different power diodes were modeled in SPICE and implemented in a 100kW inverter. The reverse and forward recovery characteristics of the diodes were simulated and compared with hardware measurement to verify the validity of the SPICE diode models. The diodes showed different dynamic and static performance and simulations were performed to investigate which parameters that influence...
With the Plug in Hybrid Electric Vehicle (PHEV) the introduction of a charger has to be done. A standalone onboard charger will increase both weight and cost of the vehicle. A better option is the integration of the charging function into the already existing propulsion converter. The aim of this paper is to assess the multilevel converter as an integrated vehicle charge and propulsion converter....
The main objective of this paper is to present to design of an on-board charger with the aim of charging a plug-in vehicle battery. This charger is able to control the values of the load voltage and current and then, maintain them at a desirable value. A first converter is used to convert the grid 50 Hz electrical quantities into dc quantities. A second converter adjusts the levels to the values required...
With the fast development of silicon carbide (SiC) technology, SiC-based power semiconductor devices have started to complete Si components in transportation applications. In this paper, two dc/dc converters for hybrid electric vehicles (HEVs) application are designed and analyzed. The losses, efficiency, junction temperature, and the volume and weight of heat sinks of two converters are calculated...
This paper presents simulation and measurement loss determination results for different switching schemes in a frequency converter using CoolMOS transistors. Different Space Vector Modulation (SVM) schemes has been investigated. The simulation and measurement results show a close correlation. The losses in the MOSFETs have been determined with temperature measurement resulting in high accuracy. It...
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