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Control method of cascaded dual active bridge converter with soft start function

A converter control, dual active bridge technology, applied in the direction of output power conversion device, conversion of DC power input to DC power output, control/regulation system, etc.

Active Publication Date: 2019-06-25
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Control method of cascaded dual active bridge converter with soft start function
  • Control method of cascaded dual active bridge converter with soft start function
  • Control method of cascaded dual active bridge converter with soft start function

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Embodiment Construction

[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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Abstract

The invention discloses a control method of a cascaded dual active bridge converter with a soft start function, which is suitable for the DC conversion field of high voltage, high power and energy bidirectional transmission. The invention aims at the current impact problem in the start-up process of the cascaded dual active bridge converter, and realizes the primary side H The AC port voltage of the bridge is slowly started, and at the same time, the duty cycle of the secondary H-bridge switch and the output voltage reference value are coordinated to realize the voltage of the AC port of the secondary H-bridge following the voltage of the primary H-bridge AC port, thereby realizing the slow start of the output voltage. Suppress current surge. After the start-up is completed, the DC input terminal voltage is evenly divided through the additional input side voltage feedback control. The invention effectively suppresses the start-up inrush current of the cascaded double active bridge converter through algorithm improvement, stabilizes the output voltage, and evenly divides the DC input terminal voltage. The control logic is simple and reliable, and it is easy for engineering practice and popularization.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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
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