Dynamic Power Smoothing Technology for Hybrid Energy Storage in More Electric Aircraft Power Supply System

To address bus voltage fluctuations during load transients in more electric aircraft (MEA) power systems, this paper investigates a 270 V high-voltage DC hybrid energy storage system (HESS). It proposes a three-stage power allocation technology based on a second-order filter, which enhances bus voltage quality during load transients and enables efficient power allocation between the generator system and energy storage units. Additionally, a dynamic pulsating power allocation strategy based on the supercapacitor (SC) state of charge (SOC) is proposed. When the SOC is at different levels, the cut-off frequency of the filter is dynamically and adaptively adjusted to control charge/discharge durations during a pulsed power event, thereby maintaining the SOC within a safe and stable range. Experimental results show that the proposed HESS power allocation method can effectively mitigate bus voltage fluctuations caused by load transients and adjust charge/discharge durations to stabilize the SOC across various levels.