MATHEMATICAL MODEL FOR BIDIRECTIONAL DC–DC CONVERTER WITHIN BATTERY ELECTRIC VEHICLE SYSTEM USING GENERALIZED STATE SPACE AVERAGING APPROACH
DOI:
https://doi.org/10.55766/sujst11838Keywords:
Battery electric vehicle, Bidirectional buck–boost converter, Generalized state space averaging method, Mathematical modelAbstract
This paper presents the derivation of a mathematical model for a battery electric vehicle (BEV) system in which a bidirectional buck-boost converter is used to regulate the high-voltage DC bus. This converter operates in two modes-step-up (boost) and step-down (buck). The proposed model was developed using the generalized state-space averaging approach, which eliminates time-dependent variables, to obtain a time-invariant model that would accurately represent the averaged dynamic behavior of the system. In addition, a simplified battery model was integrated into the overall dynamic model of the BEV system to enhance accuracy. The proposed model was validated by comparing its responses with those provided by SimPowerSystem simulations in MATLAB/Simulink. The results confirm that the proposed model accurately reproduces both transient and steady-state responses, indicating its effectiveness and suitability for future applications, such as stability analysis, controller design, and performance evaluation under various operating conditions.
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