Optimal Control Strategy for Hybrid Electric System Based on Lithium Battery Degradation Model

WANG Qiu-ting, QI Wei

Control Engineering of China ›› 2021, Vol. 28 ›› Issue (9) : 1725-1730.

Control Engineering of China ›› 2021, Vol. 28 ›› Issue (9) : 1725-1730.

Optimal Control Strategy for Hybrid Electric System Based on Lithium Battery Degradation Model

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Abstract

A optimal control strategy for hybrid electric system which concurrently accounts for fuel consumption as well as fuel cell and lithium battery degradation model is introduced. The model is based on the factors of transient power load, start/stop cycle, idle and performance loss caused by high power. An analytical solution is provided for the decay of electrochemical surface area (ECSA) of fuel cells. The degradation mechanism of fuel cells is quantified by using simplified electrochemical model. A validated empirical model is used to correlate capacity attenuationand discharge rate of lithium battery. The experimental results demonstrate that the power load curve of fuel cell stack based on different weight parameter α changes significantly, which affects its life performance.The smaller the value of α is, the steeper the load following curve of fuel cell stack is. The greater the value of α is, the smoother the power load following curve is.

Key words

Fuel cell, lithium battery, degradation mechanism, ECSA, optimal control strategy

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WANG Qiu-ting, QI Wei. Optimal Control Strategy for Hybrid Electric System Based on Lithium Battery Degradation Model[J]. Control Engineering of China, 2021, 28(9): 1725-1730

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