Dual-active bridge DC converter direct power control method based on energy closed loop

A technology of DC converter and dual active bridge, which is applied in the direction of DC power input conversion to DC power output, control/regulation system, output power conversion device, etc. Dynamic performance, speed up DAB dynamic response speed and other issues, to achieve the effect of easy setting of control system parameters, improvement of dynamic response speed, and low cost

Active Publication Date: 2019-06-07
HEFEI UNIV OF TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

The traditional closed-loop single phase-shift control method of output voltage based on PI regulator is difficult to meet the relevant dynamic response performance requirements. Therefore, many scholars at home and abroad have conducted extensive research on the improvement of the dynamic response speed of DAB converters.
[0004] The methods for improving the dynamic response speed of DAB can be roughly divided into three categories: the first category is to speed up the current response speed and improve the dynamic response performance by introducing current feedback or feedforward, such as the literature "Segaran D, Holmes D, Holmes G.Enhanced load step response for a bidirectional DCDC converter[J].IEEETransactions on Power Electronics,2013,28(1):371-379."("Bidirectional DCDC Converter Load Step Fast Response Method"—2013 IEEE Power Electronics Journal) The proposed method of sampling load current and introducing load current feed-forward speeds up the dynamic response speed of DAB, but increases the sampling of load current and increases the cost of the system; the second type is to establish a small signal model and The time-averaged equivalent model, which is brought into relevant parameters to directly calculate the phase shift angle, thereby controlling the output power to quickly reach a given value, speeds up the dynamic response speed of DAB, such as the Chinese inve

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  • Dual-active bridge DC converter direct power control method based on energy closed loop
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  • Dual-active bridge DC converter direct power control method based on energy closed loop

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Embodiment Construction

[0023] The preferred modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0024] figure 1 is a system block diagram of a direct power control method for dual active bridge DC converters based on energy closed-loop in an embodiment of the present invention, consisting of figure 1 It can be seen that the dual active bridge DC converter involved in this control method includes a DC power supply U in , an input capacitor C i , a primary side H bridge, a phase shifting inductor L, a high frequency isolation transformer T, a secondary side H bridge, an output capacitor C o and a load resistor R; the primary side H-bridge includes 4 switch tubes, denoted as switch tube S i (i=1,2,3,4), the secondary side H-bridge includes 4 switch tubes, denoted as switch tube Q i (i=1,2,3,4).

[0025] The primary side H-bridge switch S i (i=1,2,3,4), the switch tube S 1 with switch S 3 Series, switching tube S 2 with switc...

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Abstract

The present invention discloses a dual-active bridge DC converter direct power control method based on energy closed loop, and is suitable for the field of large-power bidirectional direct current conversion. Aiming at the dynamic response problem of a bidirectional full-bridge direct current converter, on the basis of single phase-shifting control, according to an output energy balance equation,an output voltage Uout is sampled and then squared to construct an output capacitance energy closed loop, the size of a phase-shifting angle is obtained through the direct power based on the dual-active bridge direct current converter power transmission model to generate switching control signals so as to achieve rapid regulation of the output voltage of the dual-active bridge DC converter. The method provided by the invention can effectively improve the dynamic response speed of the output voltage when a load is suddenly changed, only needs to sample the output voltage, and is low in cost, not sensitive to model parameters and easy for design and engineering implementation.

Description

technical field [0001] The invention belongs to the technical field of energy transmission of a bidirectional DC converter in electrical engineering, and in particular relates to a direct power control method for a dual active bridge DC converter based on an energy closed loop. Background technique [0002] Since the Dual Active Bridge (DAB) DC converter was proposed as an alternative to the high-power DC-DC converter, it has the advantages of electrical isolation, high power density, bidirectional flow of energy, up-down voltage conversion, and easy module The advantages of cascading are widely used in high-voltage, high-power, bidirectional DC energy conversion systems such as electric vehicles, distributed power generation, power electronic transformers, and locomotive electric traction systems. [0003] In order to adapt to the complex and changeable operating conditions in the above-mentioned industrial applications, the DAB as a DC voltage power conversion unit needs t...

Claims

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Application Information

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IPC IPC(8): H02M3/335
Inventor 张兴赵文广高帅刘芳
Owner HEFEI UNIV OF TECH
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