604 / 2022-03-30 18:02:00

Generalized Averaging Model of Dual Active Bridge Converter Considering the Second Harmonic Component for Solid-State Transformer

Dual-active-bridge (DAB) converter,solid-state transformer (SST),generalized average modeling

Solid-state transformers (SSTs) are promising in the flexible DC transmission and DC microgrid. However, the core equipment of SST, dual active bridge (DAB), is only modeled by dc and 1st harmonic components, which is not precise enough for control design and stability estimation.The generalized averaging model considering the second harmonic component (SHC-GAM) for DAB is proposed in the paper. The 2nd harmonic component is considered to improve the switching dynamics of the DAB, and the small-signal model and control-to-output gain are derived.The magnitude for the control-to-output transfer function of the SHC-GAM with detailed switching model is shown in Figure 1. The results are in good agreement.The SHC-GAM of DAB for SST is accurate enough and promising for practical needs.