Abstract
This paper proposes a fast load transient control for a bidirectional dual-active-bridge (DAB) DC/DC converter. It is capable of maintaining voltage–time balance during a step load change process so that no overshoot current and DC offset current exist. The transient control has been applied for all possible transition cases and the calculation of intermediate switching angles referring to the fixed reference points is independent from the converter parameters and the instantaneous current. The results have been validated by extended experimental tests.
Highlights
Interfacing two different DC sources, the DAB converter is a kind of bidirectional DC–DC
Based on SPS control, a transient control named vs vs asymmetric-double-side modulation proposed in [16] distributes the required phase-shift adjustment vp the DC bias current in the transition to both two bridges according to an optimized ratio to depress vp iL extended to extended-phase-shift control (EPS) control in [17,18]. iHowever, process
A fast transient control is proposed for a DAB converter that is able to improve the step-load transient response in terms of response time and overshoot current
Summary
With the increasing concern in environment issue and energy crisis, the power conversion systems (PCSs) have been using widely in renewable generation facilities. Based on SPS control, a transient control named vs vs asymmetric-double-side modulation proposed in [16] distributes the required phase-shift adjustment vp the DC bias current in the transition to both two bridges according to an optimized ratio to depress vp. In [21], a novel approach to keep transient voltage–time balance is to introduce a small zero-voltage duration in one of the two HF voltages It is capable of eliminating DC bias in both inductor current and magnetizing current of the transformer. A load transient modulation for EPS control will be proposed for depressing DC bias current in the load-changing process, which stems from the approach in [21].
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