Abstract
Power
electronics interfaces play an increasingly important role in the future clean
vehicle technologies. This paper proposes a novel integrated power electronics interface
(IPEI) for battery electric vehicles (BEVs) in order to optimize the
performance of the power train. The proposed IPEI is responsible for the power-flow
management for each operating mode. In this paper, an IPEI is proposed and
designed to realize the integration of the dc/dc converter, on-board battery
charger, and dc/ac inverter together in the BEV power train with high
performance. The proposed concept can improve the system efficiency and
reliability, can reduce the current and voltage ripples, and can reduce the
size of the passive and active components in the BEV drive trains compared to
other topologies. In addition, low electromagnetic interference and low stress
in the power switching devices are expected. The proposed topology and its control
strategy are designed and analyzed by using MATLAB/Simulink. The simulation
results related to this research are presented and discussed. Finally, the
proposed topology is experimentally validated with results obtained from the prototypes
that have been built and integrated in our laboratory based on TMS320F2808 DSP.
Keywords
1. Battery
electric vehicles (BEVs)
2. interleaved
dc/dc converter
3. on-board battery charger
4. Power
train control strategies
5.
Power train modeling
6.
small-signal model
Software: MATLAB/SIMULINK
Block Diagram:
Fig.
1. Schematic diagram of the battery electric vehicles.
Expected Simulation Results:
Fig2.
Dynamic performance of the battery pack and the proposed IPEI (simulation
result).
Fig3.
Comparative efficiency of the ac drive system (Motor & ESI) in the
proposed
powertrain (simulation result).
Fig4.
Efficiencies of the power electronics interfaces in the proposed power train
(simulation
result).
Fig5.
Power train efficiency without including the battery efficiency (simulation
result).
Conclusion
In
this paper, a novel integrated power electronic interface has been proposed for
BEVs to optimize the performance of the powertrain. The proposed IPEI combines
the features of the BMDIC and the ESI. The proposed IPEI and its performance characteristics
have been analyzed and presented. Different control strategies are designed to
verify the performance of the proposed IPEI during different operating modes.
It should be pointed out that the IFOC based on PWM voltage and PSO is more
efficient than IFOC based on PWM voltage which is used to drive the EM during
traction and braking modes. Moreover, the proposed IPEI can achieve a high
power factor correction, and can achieve a low THD for the input current during
charging mode from the ac grid. As is clear from the simulation results, the
proposed IPEI can reduce the current and voltage ripples, can improve the efficiency
and reliability, and can provide a compact size for the BEV power train.
Furthermore, the battery lifespan can be increased due to the ripple reduction.
Finally, the simulation and experimental results have demonstrated that the
proposed IPEI has been successfully realized and it promises significant savings
in component count with high performance for BEVs compared to other topologies.
Therefore, it can be expected that these topologies can be utilized for
development of high efficiency BEV power trains.
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