An Instantaneous Current Control Method of Full-Bridge DC Converter Based on Single Phase Shift
A DC converter, instantaneous current technology, applied in the direction of converting DC power input to DC power output, control/regulation system, output power conversion device, etc., can solve the problem of improving modeling complexity, general portability, and portability problems such as poor performance, to achieve the effect of preventing magnetic saturation, high portability, and reducing the amplitude
Active Publication Date: 2021-02-02
XI AN JIAOTONG UNIV +3
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Problems solved by technology
However, a voltage sensor is still needed to detect the input and output voltages, and the portability is average. For different single-phase dual active DC converters, it still needs to be calculated again, but the amount of calculation is small; another method is to optimize the control design and load current The transformation is introduced into the control loop as feed-forward. This control method increases the complexity of modeling. It also needs to be re-modeled for different full-bridge DC converters, and the portability is poor.
In summary, it can be seen that the existing methods require hardware such as voltage and current sensors, and the portability is poor.
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[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, which are explanations rather than limitations of the present invention.
[0029] The topology of the dual active full-bridge DC converter is as follows: figure 1 shown. where, assuming the power is from V 1 Side flow to V 2 side, the V 1 is the input side DC voltage, V 2 is the output DC voltage. L s is the leakage or additional inductance of the transformer; R s is the line resistance, i L is the inductor current of the transformer, and the transformation ratio of the transformer is n:1. In the steady state, based on the phase voltage and inductor current waveforms of the single-phase-shift dual-active DC converter, such as figure 2 shown.
[0030] Table 1 shows a set of basic parameters for setting dual active full-bridge DC converters.
[0031] Table 1
[0032] parameter value parameter value V 1 s...
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The invention discloses an instantaneous current control method of a full-bridge DC converter based on a single phase shift. When the full-bridge DC converter is in a steady state, the control method is when V 1 side and V 2 The shift phase D between the phase voltage waveforms output by the two H-bridge circuits f change, by adjusting V within the transition interval 1 side or V 2 The driving waveform of the switching tube of the side H bridge circuit makes the inductance current of the transformer reach balance only through the transition interval of half a switching cycle, and greatly reduces the magnitude of the DC bias of the inductance current, avoiding the magnetic saturation problem of the transformer, And the algorithm has high portability, thus improving the dynamic characteristics of the converter.
Description
technical field [0001] The invention belongs to the technical field of full-bridge direct-current converters, and in particular relates to an instantaneous current control method of a full-bridge direct-current converter based on a single phase shift. Background technique [0002] The full-bridge DC converter is composed of a high-frequency or intermediate-frequency transformer and two H-bridge circuits, and its topology is as follows: figure 1 shown. It is an isolated bidirectional DC converter with high power density, wide voltage input, low switching stress, easy to realize soft switching and simple control, etc. It is suitable for medium and high power applications and is suitable for hybrid electric vehicles , power electronic transformers, rail traction and smart grid energy storage systems, etc. [0003] For a full-bridge DC converter operating under a single-phase-shift control strategy, in a steady state, adding a disturbance or changing its control variable will ...
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IPC IPC(8): H02M3/335
Inventor 王跃李凯许景慧高国庆李甜徐鹏帆张晓洁盛万兴李蕊刘海涛吴鸣孙丽敬张海李彬彬
Owner XI AN JIAOTONG UNIV