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- Leistungsmessung (3)
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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 schemes will be presented, as well as the transition
between those schemes. Finally, the performance of the different schemes will be proved by dynamic and
stationary tests through fully automatized measurement analysis.
This paper reveals that the standard test procedures for the qualification and verification of traction battery systems are not sufficient in certain cases. In fact, realistic and application-oriented tests on the interaction among the complex battery subsystems are inevitable. To achieve these objectives, a high-performance test bench with the unique selling features of a high voltage/- and current range, extremely low ripple currents, and high dynamics is presented. For the operation of the applied multiphase current-sharing inverter for charging/discharging the device under test (DUT), special control algorithms, especially a current balancing control method, is introduced.
Electric drives in road vehicles with a battery as energy storage are about to be introduced to the mass market. In order to guarantee the quality and operational safety of battery-powered vehicles, considerable efforts must be made by car manufacturers and their suppliers. Since the properties of the batteries significantly determine the performance of the vehicles, special test benches with precise measuring systems are required for the accurate determination of the battery properties. The safety devices of the traction batteries must also be tested on high-performance test benches. In this paper the necessary test benches and the corresponding measuring systems are presented. Estimations of the measurement uncertainty and possibilities to increase measurement accuracy are presented.