Suppression Method of Transient DC Bias in Dual Active Bridge Converter with Three Phase-shift Control
A dual active bridge, DC bias technology, applied in the direction of converting DC power input to DC power output, control/regulation systems, output power conversion devices, etc., can solve the problem that the DC bias of dual active bridges cannot be completely suppressed problem, to prevent oversaturation and switch overcurrent, simple control, and eliminate DC bias.
Active Publication Date: 2022-03-29
BEIJING INSTITUTE OF TECHNOLOGYGY
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[0005] In order to solve the problem that the prior art method cannot completely suppress the DC bias in the dual active bridge (DAB) converter, the purpose of the present invention is to provide a three-phase-shift control dual active bridge converter transient DC bias suppression method, in a global range, can suppress the DC bias generated by sudden load changes, prevent transformer saturation and switch tube current from being too large, and improve converter efficiency
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[0039] The present invention will be further described below in conjunction with accompanying drawing and embodiment, have also described the technical problem and beneficial effect that technical solution of the present invention solves simultaneously, it should be pointed out that described embodiment is only intended to facilitate the understanding of the present invention, and to It does not have any limiting effect.
[0040] Such as figure 1 Shown is a dual active bridge (DAB) converter circuit topology diagram, the converter is composed of eight switching tubes, the primary side and the secondary side are composed of four switching tubes. The primary side full bridge contains 4 switching tubes Q 1 -Q 4 . Switch tube Q 1 and switch Q 2 form a bridge arm, Q 2 The drain connection of Q 1 source. Switch tube Q 3 and switch Q 4 form a bridge arm, Q 4 The drain connection of Q 3 source. Switch tube Q 1 The drain and switch Q 3 The drains of the switches are conn...
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The invention discloses a method for suppressing the transient DC bias of a dual active bridge converter with triple phase shift control, which belongs to the field of bidirectional DC-DC converters for energy storage in the field of power electronics. Dual active bridge DC-DC converter (DAB), which consists of series inductors and transformers, primary side full bridge, and secondary side full bridge, adopts three-phase shift control, by controlling the primary side and secondary side full bridge of the converter The duty cycle and phase shift angle enable control of bidirectional power flow. In the steady state, when the load changes suddenly, the current in the transformer will generate a large DC bias, which may lead to oversaturation of the transformer, overcurrent of the switching tube, shortening the life of the components and reducing the efficiency of the converter. Under the current peak modulation strategy of triple phase-shift control, the present invention analyzes the cause of DC bias, and eliminates the DC bias by controlling the phase shift angle during load shedding, thereby improving the high-efficiency electric energy of the dual active bridge DC-DC converter Transform, realize the stable control of the converter, and improve the efficiency of the converter.
Description
technical field [0001] The invention relates to a method for suppressing the transient DC bias of a dual active bridge converter with triple phase shift control, and belongs to the field of bidirectional DC-DC converters for energy storage in the field of power electronics. Background technique [0002] Energy storage systems have become the main source of energy for devices such as microgrids and uninterruptible power supplies. Dual active bridge DC-DC converters have become the main circuit topology of bidirectional DC-DC converters in energy storage systems. figure 1 Shown is the dual active bridge DC-DC converter circuit topology for which the present invention is directed. The energy storage DC-DC converter not only needs to achieve high-efficiency power conversion, but also needs to avoid excessive DC bias during load shedding. [0003] In order to solve the DC bias generated by the dual active bridge DC-DC converter when the load changes suddenly, "Deadbeat Current ...
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IPC IPC(8): H02M1/32H02M3/335H02J7/00
CPCH02M1/32H02M3/33584H02J7/0068H02J7/0063H02J7/0029H02J7/00304H02J2207/20
Inventor 郭志强骆勇
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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