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This paper will present different modulation schemes for optimizing the efficiency of low-voltage traction drives. The converter of the vehicle automatically has to select the most suitable modulation or control scheme depending on the present operating point in order to maximize the efficiency of the complete drive train. Furthermore, the functional principles and algorithms of the individual modulation...
In this contribution, the switching frequency based active power will be presented as a new power definition. It combines the information of the instantaneous power, as product of voltage and current, and the conventional active power representing the mean value of the instantaneous power over the fundamental period. Under several theoretical conditions the switching frequency based active power is...
In this paper, a highly efficient drive system for constant rotational speed applications, including a doubly fed permanent magnet synchronous machine (DFPMSM), will be presented. Due to loss minimization, most of the stator windings of the DFPMSM are directly fed by the electrical grid, while only some of the stator windings are fed by a low-power inverter to stabilize the complete drive system.
This paper will present a simplified control algorithm for synchronous reluctance machines (SynRM) in low-voltage applications. In this specific case, the entire drive train, including the battery, is considered. The difficulty of the non-linearity of the SynRM is estimated using an adapted model, based on the measured values. The model parameters have been determined through a repeatable method and...
In this paper, a highly efficient drive system for applications with a constant rotational speed will be presented. For this a doubly fed permanent magnet synchronous machine (DFPMSM) will be used as motor/ generator. Since permanent magnet synchronous machines (PMSM) don't work stable at the electrical grid without the usage of additional components such as damper windings or a damping mechanical...
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