Correct Power Flow and Losses in Real-Time Simulation of HEV Powertrains

Hybrid electric powertrains are developed for reducing the fuel consumption and consequently the emission of carbon dioxide. The fuel consumption of those systems depends significantly on the topology of the powertrain and the applied control strategy. Hardware-in-the-Loop simulation can be used for improving the control strategy, where a real-time model of the powertrain with accurate consideration of the power losses is required. Developing those models is a time-consuming task due to the high dynamics and switching frequencies of the electrical subsystem and the various configurations of the mechanical subsystem. In this contribution methods for an efficient modeling of transmission systems and electric drives are presented. Real-Time capability as well as the correct power flows and losses are considered. Finally, simulation results are shown.