Power plateau and anti-power phenomenon of dual active bridge converter with phase-shift modulation

Abstract

Abstract-In this paper, an improved power flow model for dual active bridge (DAB) converters with phase-shift modulation is introduced. Based on the analysis and the accordingly derived equations, a power plateau phenomenon, in which the phase shift loses its power-regulating capability, is investigated. Moreover, it is found that this power plateau phenomenon leads to an inversed power flow characteristic in some specific regions compared to the models reported in previous literature. The characteristics of the power plateau and its occurring conditions are derived and analyzed in depth. The calculations, simulations and analyses have been verified by experiments.

Model of DC/DC Dual-Bridge Series Resonant Converter in Buck and Boost Modes for Output Current and Commutation Timing Control

“…the control inputs ω , s , β can be passed through integrators, making the system differentially controllable by corrective actions rather than using absolute values. Thus, the function h is vector-valued given by (20), (16), (15), and dynamical part of the plant given by f = 0, g i = 1 are describing individual integrators only. Worth noting that another option to introduce dynamics to the model is consider simple first order delays for control inputs ω , s , β , which could model slew rate limiters as filters or simply a command propagation delay through the software chain and PWM modulator.…”

“…Piece-wise time-domain modeling. This technique is originally applied to the dual-bridge converters [17,18,19,20] without a resonant tank, where transformer current is a straight line between switching events. Thus each time interval between switching of bridges can be analyzed separately, and then final waveform is obtained by gluing together transient responses for consequential time intervals.…”

A Universal Power Flow Model for Dual Active Bridge-Based Converters With Phase Shift Modulation

“…The basic modulation strategy is the phase-shift modulation (PSM), where both full-bridges are modulated to generate square waves, while the power flow is controlled by adjusting the phase shift between these two square waves [14] [15]. A few researches have been done to explore the power flow characteristics of the DAB converter with PSM [16]- [20]. In [16], the short-time-scale transient processes in DAB converters with SPSM were discussed.…”

“…In [19], a lossless power flow model was derived considering dead times. With the model, some power flow characteristics were given, including the power plateau phenomenon which are further investigated in [20]. In [20], a power flow model considering the dead Fig.…”

“…With the model, some power flow characteristics were given, including the power plateau phenomenon which are further investigated in [20]. In [20], a power flow model considering the dead Fig. 2: Topology of the P 2 DAB converter time and the lossy elements, i.e.…”