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In hybrid and electrical vehicles the electric components have to be optimized to their limits. The voltage which is delivered by a high-voltage battery should be used fully by the machine. This paper describes the influence of the dc-link voltage on the efficiency and the operating limits of the electric system. For the optimal usage of the dc-link voltage, the converter control has to be extended...
PWM current source converters (CSCs) can directly replace traditional thyristor rectifiers in many industrial applications to improve power quality significantly. In this work, a design process for PWM current source rectifiers in the range of 1-10 MVA is developed. Different PWM techniques for CSCs are reviewed in the light of semiconductor losses and harmonic distortion of the modulated current...
This paper presents a high-efficient three-phase DC- AC grid-connected converter rated at 150 W. Two fundamental aspects led to the high efficiency, e.g. 96.2% at nominal power which corresponds to only 5.9 W losses. First, over the whole operation range, the converter operates as a resonant pole inverter (RPI), thus zero voltage switching at turn on is achieved. Second, the variable-frequency pulse-width...
This paper presents a dynamic boost converter as input stage for a high efficient double 120deg flattop modulation based three-phase inverter. The boost converter can be regulated with hysteresis control or predictive PWM. The objective of the input stage is to provide a dynamic and accurate current into a pulsating DC-link. The algorithms are verified with simulations and experiments using a prototype...
This paper describes the design of a digital control for a 3.3 kV, 1 MVA three-level PWM converter operating as test generator for disturbances in medium-voltage grids according to standards like IEC 61000, EN 50160, and IEEE 1547. The proposed control combines state-feedback with additional dynamic output feedback. It is designed fully in the stationary reference frame to avoid processing of complex...
Instantaneous torque control for switched-reluctance-machines (SRMs) with an arbitrary number of phases is introduced in this paper. Direct portability of this control to machines with any number of phases is achieved by the developed multiphase-torque-sharing concept. This concept is also necessary for SRMs where maximum torque can only be achieved by phase overlap of more than two phases. Furthermore,...
A method of direct instantaneous torque control for switched reluctance motor drives using pulse width modulation based on flux linkage prediction is presented in this paper. The torque characteristic of the machine allows a prediction of reference flux linkage for the next sampling time-step. By estimating this flux linkage, the necessary average phase voltage for the next PWM-period can be calculated...
In the future, automobiles will be powered by a 42 V PowerNet. To supply conventional loads, such as incandescent lamps, PWM solutions and solutions using power modules are proposed. Compared to the PWM solutions, solutions using decentralised power modules can be more advantageous. This paper describes two power module prototypes using planar magnetic cores for such an application. The circuit topology...
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