Cascaded type dual-active-bridge converter control method with soft start function
A converter control, dual active bridge technology, used in output power conversion devices, conversion of DC power input to DC power output, control/regulation systems, etc.
Active Publication Date: 2018-11-23
HEFEI UNIV OF TECH
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Problems solved by technology
[0006] Aiming at the inrush current problem in the start-up process of the existing cascaded dual active bridge converters, the present invention proposes a software with no additional external auxiliary circuit, compatible with normal phase-shifting and voltage equalization control, and no mode switching. Control method of cascaded dual active bridge converter with start-up function
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[0040] The preferred modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0041] Depend on figure 1 It can be seen that the cascaded dual active bridge converter involved in the present invention includes: DC voltage source U IN , n dual active bridge converters with the same topology and load resistance R; any one of the n dual active bridge converters with the same topology is denoted as a dual active bridge converter DAB i (i=1, 2...,n), each dual active bridge converter contains an input capacitor C IN_i (i=1, 2...,n), a primary side H bridge H IN_i (i=1, 2...,n), a phase-shifting inductor L i (i=1, 2...,n), a high-frequency isolation transformer T i (i=1, 2...,n), a secondary side H bridge H OUT_i (i=1, 2...,n) and an output capacitor C OUT_i (i=1, 2...,n); the primary side H bridge H IN_i (i=1, 2...,n) contains 4 switching tubes, which are the switching tubes S i_1 (i=1,2...,n), S i_2 (i=1,2......
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The invention discloses a cascaded type dual-active-bridge converter control method with a soft start function, and is suitable for the field of direct current conversion of high-voltage high-power and energy bidirectional transmission. The method aims at the problem of current impact occurring in the starting process of the cascaded type dual-active-bridge converter; the voltage of an H-bridge alternating-current port of the primary side is slowly started by controlling the duty ratio of an H-bridge switching tube at the primary side of the cascaded type dual-active-bridge converter in the starting process; and meanwhile, the voltage of the H-bridge alternating-current port of the secondary side is controlled to follow the voltage of the H-bridge alternating-current port of the primary side by cooperatively controlling the duty ratio and the output voltage reference value of the H-bridge switching tube of the secondary side, so that the slow start of the output voltage is further realized, and the current impact is inhibited. After the starting is completed, additional input side voltage feedback control is carried out, so that the direct current input end voltage is equally divided. According to the method, an algorithm is improved, so that the start impact current of the cascaded type dual-active-bridge converter is effectively inhibited and the output voltage is stabilized,and the direct current input end voltage is equally divided; and the control logic is simple and reliable, and engineering practice and popularization can be carried out easily.
Description
technical field [0001] The invention belongs to the energy transmission technology of a bidirectional DC converter in the field of electrical engineering, and in particular relates to a control method of a cascaded dual active bridge converter with a soft start function. Background technique [0002] In recent years, the energy problem has become increasingly serious, which has promoted the development of renewable energy represented by wind energy and solar energy. In the application of new energy, DC converters have many applications. Therefore, it is necessary to find a high-efficiency DC converter. Transformers are of great importance. Dual Active Bridge (DAB) converter has the characteristics of bidirectional flow of power, high power density, low cost, and easy implementation of soft switching. It is widely used in new energy power generation and electric vehicles, and has become a research hotspot in recent years. [0003] DAB converters usually adopt control methods...
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IPC IPC(8): H02M3/335H02M1/36
CPCH02M1/36H02M3/3353H02M3/33576H02M1/007
Inventor 张兴赵文广高帅郭华越王付胜刘芳
Owner HEFEI UNIV OF TECH