Adaptive Dual Active Bridge Converter With LCL Filter Using Switch‐Controlled Capacitor for Inductance Variation Compensation

ABSTRACT LCL‐type dual‐active‐bridge (DAB) converters offer high power density but are analytically sensitive to deviations in resonant parameters. Variations in inductance, often reaching 25% due to thermal factors and magnetic characteristics, disrupt the resonance condition, leading to a loss of zero‐voltage switching (ZVS). To address this vulnerability, this paper presents an adaptive LCL‐DAB architecture that utilizes a switch‐controlled capacitor (SCC). In this strategy, dual‐phase‐shift (DPS) modulation is used to maintain ZVS and regulate the output voltage. Concurrently, the SCC compensates for inductive‐reactance drift to lock the ideal resonant frequency and maintain ZVS. This allocation of control functions ensures the converter sustains the ideal analytical resonant state across the entire operating range and prevents control‐loop interference during load transitions. Results demonstrate that the proposed system successfully compensates for a 25% variation in inductance while achieving a peak efficiency of 98%. By providing continuous reactance compensation, this architecture ensures superior performance compared with static or discretely tuned configurations.