Abstract
The manipulation of the bidirectional power in a dual-active-bridge converter relies on the adjustment of several phase-shift angles. Improper implementation of those adjustments during the transient process of a step load change may induce transient DC bias current in the transformer and accompanied high peak current, which may result in excess loss and safety issues potentially. The paper proposes a load transient modulation to execute the adjustments of the two phase-shift angles for extended-phase-shift (EPS) control in a predictive manner. An unknown phase-shift is introduced to the gating signals of one bridge arm, and the gating signals of other bridge arms would be modified accordingly to realize the required adjustment of the two phase-shift angles together. With the proper selection of the introduced phase-shift, the power adjustment can be done in less than one high-frequency cycle without resulting in DC bias and overshoot current. Although there are four different operation modes existing in EPS, a universal solution of the unknown phase-shift can be obtained for all possible power transition cases between different modes. Validation of the proposed method is performed by means of both simulation and experimental tests.
Highlights
Isolated bidirectional DC/DC converters (IBDCs) are the key components in energy storage systems in applications of renewable generation and electrical transportation [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18]
A transient modulation is proposed to realize fast and smooth transition at load changing in a DAB converter with extended phase-shift (EPS) control
The required adjustments of involved gating signals are completed in less than one HF period in a specialized manner so that no overshoot current and DC bias will arise during the process
Summary
Isolated bidirectional DC/DC converters (IBDCs) are the key components in energy storage systems in applications of renewable generation and electrical transportation [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18]. When a step load change is requested in a DAB converter, one or more phase-shift angles are to be adjusted. A similar solution was given for a single-phase DAB under SPS control in [28] by changing the gating signals of two arms in one bridge twice continuously, which could be applied to reverse the power flow instantly. It may induce a peak current under some specific conditions. A predictive load transient modulation for EPS control will be proposed to execute the adjustment of gating signals during the load-changing process.
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