EPE Journal Volume 22-3 
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EPE Journal Volume 22-3 - Editorial
EPE Journal Volume 22-3 - Papers
EPE Journal Volume 22-3: Other



 EPE Journal Volume 22-3 - Editorial 

The EPE Conference: new pace and new name EPE ECCE Europe Energy Conversion Congress and Exhibition  [Details]
By B. Sneyers
The EPE Conference: new pace and new name EPE ECCE Europe Energy Conversion Congress and Exhibition

The place to be every year 2013, Lille France, 2014 Lappeenranta, Finland, 2015 Geneva, Switzerland


 EPE Journal Volume 22-3 - Papers 

Normally-On SiC JFETs: Active Protections  [Details]
By Fabien Dubois, Dominique Bergogne, Cyril Buttay, Hervé Morel, Régis Meuret
Normally-on Silicon Carbide JFETs are powerful power switches that allow improvement of the efficiency and high temperature operation capability of Voltage Source Inverters (VSI). However, some safety considerations have to be taken against short-circuit, voltage breakdown and punch-through conditions. In this paper, it is proposed an overview of the failure mechanisms of the SiC JFET. Fast and reliable solutions to protect SiC JFETs are also presented. Experimental validation of such protections and investigation of gate destruction mode are proposed.

Space Vector Based Hybrid Random Pulse Width Modulation Technique for a 3-Level Inverter  [Details]
By David Solomon George, M.R. Baiju
This paper proposes a Space Vector based Random Pulse Width Modulation technique (RPWM) for a 3-level inverter. Randomization is achieved by random placement of active vectors in fixed switching time period. Flexibility in random placement is limited when the duration of active vectors is comparable with switching time period. In such case, this paper proposes a hybrid operation where, in addition to random placement of active vectors, switching frequency is also varied randomly for every PWM cycle. In hybrid operation, switching frequency is limited in the range 2.5 ± 1 kHz by limiting the bounds of the randomization. The proposed scheme uses a mapping technique, by which, randomization is effected to the vectors of a 2-level inverter. From random vectors of 2-level inverter, random switching vectors for the 3-level inverter are derived. The proposed scheme does not require any external circuitry and it can be implemented for any 3-level inverter topology. The algorithm is implemented in TMS320LF2407 DSP platform for a 2-hp induction motor driven by a 3-level inverter in open-end winding configuration and experimental results are presented.

Classical Model Predictive Control of a Permanent Magnet Synchronous Motor  [Details]
By Jean-François Stumper, Alexander Dötlinger, Ralph Kennel
A model predictive control (MPC) scheme for a permanent-magnet synchronous motor (PMSM) is introduced. The torque controller optimizes a quadratic cost consisting of control error and machine losses repeatedly, accounting for the voltage and current limitations. The scheme extensively relies on online optimization. To meet the runtime limitation, a suboptimal algorithm based on differential flatness, continuous parameterization and linear programming is introduced.
The multivariable controller exploits cross-coupling effects in the long-range constrained predictive control strategy. The optimization results in fast and smooth torque dynamics while inherently using field-weakening to improve the power efficiency and the current dynamics in high speed operation. As distinctive MPC feature, constraint handling is improved, instead of just saturating the control input, field weakening is applied dynamically to bypass the voltage limitation. The performance of the scheme is demonstrated by experimental and numerical results.

Loss Comparison of Different Sub-Module Implementations for Modular Multilevel Converters in HVDC Applications  [Details]
By Tomas Modeer, Hans-Peter Nee, Staffan Norrga
This paper presents a loss calculation and comparison between different submodule topologies and semiconductor choices for a Modular Multilevel Converter in a 1.1 GW, ± 320 kV HVDC application. Accordingly, a detailed analysis of the losses for three different M2C implementations using both insulated gate bipolar transistors (IGBTs) and integrated gate-commutated thyristors (IGCTs) is presented. The losses for six different submodule realizations are shown in a loss breakdown in Fig. 7. It shows that the very low conduction loss of the IGCT is to some degree offset by higher switching losses and extra turn-on snubber losses but that the IGCT implementations provide significantly lower losses than their IGBT counterparts. The loss break-down also shows that clamp-double submodules and full-bridge submodules suffer from approximately 25 % and 50 % additional losses respectively as compared to the half-bridge case. An experimental verification of the loss calculations has been performed using a down-scaled M2C prototype. The results show a very good agreement between calculations and measured losses.


 EPE Journal Volume 22-3: Other 

EPE-PEMC 2012 ECCE Europe: Awards  [Details]
By B. Sneyers
Several awards bestowed on outstanding personalities during EPE-PEMC 2012 ECCE Europe 15th Power Electronics and Motion Control Conference and Exposition