A New Hybrid White Shark and Whale Optimization Approach for Estimating the Li-Ion Battery Model Parameters

Constructing a reliable equivalent circuit of Li-Ion batteries using real operating conditions by estimating optimal parameters is mandatory for many engineering applications, as it controls the energy management of the battery in a hybrid system. However, model parameters can vary according to the electrochemical nature of the battery, so improving the accuracy of the battery model parameters is essential to obtain reliable and accurate equivalent circuits. Therefore, this paper proposes a new efficient hybrid optimization approach for determining the proper parameters of Li-ion battery Shepherd model equivalent circuits. The proposed algorithm comprises a white shark optimizer (WSO) and the whale optimization approach (WOA) for modifying the stochastic behavior of the WSO while searching for food sources. Minimizing the root mean square error between the estimated and measured battery voltages is the objective function considered in this work. The hybrid variant of the WSO (HWSO) was examined with two different types of batteries. Moreover, the proposed HWSO was validated versus a set of recent meta-heuristic approaches including the sea horse optimizer (SHO), artificial gorilla troops optimizer (GTO), coyote optimization algorithm (COA), and the basic version of the WSO. Furthermore, statistical analyses, mean convergence, and fitting curves were conducted for the comparisons. The proposed HWSO succeeded in achieving the least fitness values of 2.6172 x 10(-4) and 5.6118 x 10(-5) with standard deviations of 9.3861 x 10(-5) and 3.2854 x 10(-4) for battery 1 and battery 2, respectively. On the other hand, the worst fitness values were 6.5230 x 10(-2) and 6.6197 x 10(-5) via SHO and WSO for both considered batteries. The proposed HWSO results prove the efficiency of the proposed approach in providing highly accurate battery model parameters with high consistency and a unique convergence curve compared to the other methods.

Automated summary

Constructing a reliable equivalent circuit for Li-Ion batteries is crucial in energy management of hybrid systems. This paper proposes a new hybrid optimization approach, combining white shark optimizer and whale optimization approach, to determine the optimal parameters of the battery model. The proposed approach outperforms other meta-heuristic methods, achieving high accuracy and consistency in estimating battery model parameters.