To address the problem that the output impedance of the bidirectional DC/DC converter is difficult to quantify due to the participation of multiple control links and the coupling of multiple parameters, a sensitivity analysis of the output impedance of the bidirectional DC/DC converter based on the Sobol method is proposed to quantify the influence of each parameter on the output impedance. Firstly, the mathematical model of the bi-directional DC/DC converter of the marine lithium battery energy storage system is established and the analytical expression of the output impedance of the bidirectional DC/DC converter is derived; secondly, the Sobol method is used to carry out the impedance sensitivity analysis and quantify the influence of each parameter. Finally, the output impedance model of the bi-directional DC/DC converter of the marine lithium battery energy storage system is measured by MATLAB/Simulink simulation, and the correctness of the sensitivity analysis is verified by changing the relevant parameters.
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