Abstract
Dual active full-bridge (DAB) DC/DC converters are widely used in energy storage systems with bidirectional energy flow, such as fuel cell hybrid vehicles. This paper presents a robustness design method for DAB converter power system stabilizers. Based on the single-phase-shift control model of the DAB converter, the small signal model and the multicell structure of the converter are established and the state equation of the system is obtained. Then, the controller design problem is transformed into a linear quadratic regulator problem, which is solved by linear matrix inequality. The controller designed by this method can make the DC/DC converter run stably even when the parameters are uncertain, which is verified by simulation and experiments.
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