In recent years, more and more components in vehicles have been electrified in order to improve the safety and comfort of the passengers as well as the driving performance. Owing to these developments, it has become increasingly difficult to guarantee the voltage stability within the 12 V as well as the high voltage power bus. However, a new degree of freedom arises, as the two power nets are connected in order to exchange energy. As a consequence, they are able to stabilize their voltage reciprocally. This paper deals with the analysis of how two voltage levels can be coupled actively in order to stabilize their voltages in power demanding situations. In this paper, the coupling of two voltage levels in automotive power buses is analyzed. First of all, a test bench with a multilevel voltage power net is described that enables researching into the active coupling of the voltage levels by a DC chopper converter in order to stabilize their voltages. In general, there are two possible control modes: In the current/power control mode, the power flow is increased preventively when the prediction model detects a critical situation probably occurring in the near future. In the voltage control mode, the voltage controller of the DC chopper converter is used to stabilize the power net voltage in real-time. In the experimental section, this stabilization method is analyzed. It is shown that the minimum voltage in very power consuming driving situations is increased about 1.5 V per 1000 W applied power supplied by the DC chopper converter. Thus, there can be an appreciable stabilizing effect by the coupling of two voltage levels.


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    Title :

    Experimental investigations on voltage stability in multilevel power nets


    Contributors:

    Published in:

    Publication date :

    2012


    Size :

    11 Seiten, 8 Bilder, 24 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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