Impedance-Based Stability Analysis of DAB Converters With Single-, Double-, or Cooperative Triple-Phase-Shift Modulations and Input LC Filter

The impedance-based criterion has turned out to be a very effective tool for the stability analysis of dual active bridge (DAB) converter with its input LC filter. While impedance DAB is highly dependent on modulation methods, influences methods impedances converters are still not clear. To close this gap, three typical converters, traditional single-phase-shift (SPS), dual-phase-shift (DPS) and emerging cooperative triple-phase-shift (CTPS) modulation, studied in paper. First, full-order models these derived first time. Second, based developed models, impacts schemes revealed. An interesting phenomenon found that open-loop SPS-DAB DPS-DAB present characteristics parallel-connected inductor capacitor, while CTPS-DAB presents resistor characteristics. Third, optimal scheme system investigated. Finally, theoretical been validated by experimental results.