A hybrid power system, which is comprised of Ultracapacitors, power battery pack and DC/DC converter, is researched to meet the dual requirements of high-energy density and high-power density for the applications in plug-in hybrid electric vehicles (PHEVs). The working principles are analyzed and its reasonable topology is determined based on comparisons. A logical threshold control is built and its thresholds are optimized. An HIL platform is built which is based on the xPC Target real-time simulation and uses the hybrid power system as the in-loop hardware. The simulation results show the idea of the hybrid power system and its control method is feasible. From the results of the simulation we can see that the control strategy for the hybrid power system ensure comprehensive the advantage of ultracapacitor and battery, it makes the power system with high power and energy density. The required power of the motor is shared by battery and ultracapacitor. The main power is still afforded by battery while ultracapacitor takes as the auxiliary power or load. Figure 7(a) shows the battery and ultracapacitor current curve of the simulation. We can see that the battery current is controlled under 1C while the ultracapacitor may have high current. The ultracapacitor is connected to the bus in serial with DC/DC converter, it can reduce the big currents impact on the battery and dramatically improve the dynamics of the energy system property during 200∼300 seconds with high power output. Also it may absorb the energy quickly and efficiency with high current during 300∼400 seconds at breaking time, it saves energy and protect the battery from damage for high current. The state curve of the battery and ultracapacitor in figure 7(b) show energy of the ultracapacitor keeps steady during the whole driving cycles, acting like a reservoir to balance the input and output. So the battery energy consumes at a steady level and the ultracapacitor realize the effect in the hybrid power system.


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    Titel :

    Hardware-in-the-loop simulation on a hybrid power system in plug-in hybrid electric vehicles


    Beteiligte:
    He, Hongwen (Autor:in) / Sun, Fengchun (Autor:in) / Xiong, Rui (Autor:in) / He, Yin (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2012


    Format / Umfang :

    5 Seiten, 7 Bilder, 1 Tabelle, 6 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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