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A potentially efficient topology for electric vehicle powertrains consists of a two-level inverter with a DC-DC converter, operated with variable DC voltage control. Previous studies show that variable DC voltage control can lower the amount of motor torque ripple and increase the efficiency of a drive system as a whole. In literature, the target Modulation Index (MI) is assumed to be kept at a high...
Different powertrain topologies have various advantages and disadvantages when used in electric vehicles. In this paper, the efficiencies of two different powertrains are compared. Both designs use a 2 level inverter and a surface mounted Permanent Magnet Synchronous Motor (PMSM). In the first design the inverter is directly powered by a high voltage battery and is operated using traditional pulse-width...
The small-signal stability of an interconnected source and load can be analyzed using the frequency-response methods of stability analysis. Existing frequency-response methods of stability analysis introduce artificial conservativeness and do not explicitly address stability robustness against load perturbations, that is, by how much the load can change such that the system will remain stable in the...
The efficiency of electric powertrains is of great importance for the electrification of transport. In this paper, the efficiencies of two different powertrains are compared. The first design uses a traditional pulse-width modulation (PWM) battery-powered inverter with a high voltage battery pack. In the second case, the battery is connected to a bidirectional DC-DC converter and a variable DC voltage...
This paper presents a new approach for neutral point balancing in dual three-level, T-type, neutral-point-clamped (T-NPC) inverters feeding a dual 3-phase permanent magnet synchronous machine (PMSM). Three-level Space Vector PWM (SVPWM) modulation scheme, without any separate capacitor balancing capability has been employed. However, by synchronously interleaving the switching pulses of both inverters,...
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