A Lifetime-Aware Control Strategy for Parallel Charging Systems of Energy Storage Light Rail

Recent years have seen growing interest in energy storage light rail where multi-module charging system is used to realize high power fast charging. In existing methods, each module supplies the same current to charge onboard super-capacitors. However, this current sharing method will increase maintenance frequency of the charging system and accelerate the modules aging speed, because it does not consider the different degradation degree among modules. In this paper, a lifetime-aware current control strategy is proposed for addressing the above issues. First, a data-driven remaining useful life (RUL) estimation algorithm based on a linear approximation model is proposed. Second, the currents supplied by all modules are allocated by a proportional current control strategy based on the RUL estimation algorithm. Experimental results show that the proposed method has the advantages of narrowing the degradation differences among modules and reducing the heat dissipation, compared to the current sharing mode.

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