Quad-Port AC–DC–DC–AC Operation of Isolated Dual Three-Phase Active Bridge Converter

Duty-Cycle Dependent Phase Shift Modulation of Dual Three-Phase Active Bridge Four-Port AC–DC/DC–AC Converter Eliminating Low Frequency Power Pulsations

“…For reasons of compactness, a description of the operating principle of the D3ABC is omitted here, since this has been described in detail in [21], [29] (for completeness, a summary of this is given in Appendix A of this paper). The following paragraphs summarize the most important aspects.…”

“…A simple approach which fulfills ( 9), (10), and ( 11) is presented in [29]. There, constant and equal power is used in all three phases, ⟨p aA ⟩ = ⟨p bB ⟩ = ⟨p cC ⟩ = const.…”

“…The scaling factor P 0 in (13) was determined in the course of the analysis of the operating modes of the DAB presented in [29] and contains all hardware-specific values,…”

“…Accordingly, the variables p, D 1 , and D 2 are to be replaced by the variables of the DAB converter part to be evaluated, e.g., by p aA , D 1,a , and D 2,A in case of converter phases a-A. As shown in Appendix A, (13) is conceived in such a way that a significant increase of P Σ is achieved (compared to the previous approach presented in [29]) and that the constraints ( 9) and ( 10) are met for sinusoidal duty cycles according to ( 5) and ( 6), regardless of the values of the seven coefficients, a 0 . .…”

“…A previous study [29] describes the four-port operation of the D3ABC under the simplifying condition that the individual DAB converter parts of the D3ABC are operated at constant power in steady state. This leads to a major reduction of the maximum transferrable power.…”