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A three-phase solid state transformer (SST) based on serial H-bridge multilevel converter, with advantages as expandable modular structure, controlled power quality and low dependence on copper/steel, is applied to replace the traditional line frequency step-up transformer on PV generation. Because of the input-parallel output-serial dual active bridge (DAB) based submodules with inner dc links, the...
The paper derives a technique to develop large and small signal state-space models of a single-phase dual active bridge (DAB) based DC-DC converter operated in phase-shift mode. An improved first harmonic approximation (I-FHA) method is proposed by introducing a correction factor to the conventional first harmonic approximation (FHA) technique. The output DC voltage and the two orthogonal components...
This paper presents a hybrid control strategy for a dual active bridge (DAB) based dc-dc converter which combines the benefits of traditional phase shift and burst mode modulation schemes. The advantage of using such a control strategy stems from the fact that it can extend the zero voltage switching (ZVS) range of all power switches in both the primary and secondary bridges when there is a wide variation...
In this paper, a double integral sliding mode control (DSMC) of bidirectional isolated dual active bridge (DAB) DC/DC converters is proposed for battery energy storage systems (BESS). A mathematical model for nonlinear control design is derived, which is based on the harmonic model of the DAB converter with the single phase-shift modulation (SPSM). The proposed control method can provide the zero...
This paper presents the design and implementation of a large-step-down soft-switched dc-dc converter based on the active bridge technique which overcomes some of the limitations of the conventional Dual Active Bridge (DAB) converter. The topology comprises a double stacked-bridge inverter coupled to a reconfigurable rectifier through a special three-winding leakage transformer. This particular combination...
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