Abstract
A quasi-precise modeling method based on the accurate source-load coupling model and the average model of battery energy storage system with pulsed load (BESS-PL), which retained its unique pulse characteristics and reasonably simplified the difficulty of theoretical analysis, was proposed to achieve the stability analysis of the source-load coupling and pulse characteristics of BESS-PL. Based on the quasi-precise model exchange work of the BESS-PL framework was calculated, and the influence of pulse frequency and duty cycle ratio on system stability was examined using the Bode diagram. The strength of the key parameters of the BESS-PL system, as well as the instantaneous power of source and load, were analyzed and discussed based on the waveform analysis and eigenvalue calculation of the actual test platform. This analysis and discussion further validate the stability analysis based on the quasi-precise model. The findings demonstrate that the BESS-PL system exhibits substantial coupling between the source and the pulse load, with stability being lowest at a particular frequency point in the intermediate frequency mode and the pulse duty ratio showed 50%.
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