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Bidirectional full-bridge dc-dc converter control method and device based on phase shift angle slope feedforward

A technology of DC-DC and converter control, which is applied in the direction of output power conversion device, control/regulation system, DC power input conversion to DC power output, etc. It can solve the dynamic characteristics of DAB DC bus voltage fluctuation and shifting control method In order to reduce the fluctuation, improve the stability of the change and reduce the overshoot, etc.

Active Publication Date: 2019-06-21
XUJI GRP +5
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of sudden loading and unloading, due to the poor dynamic characteristics of the shifting control method, the DAB DC bus voltage fluctuates and the current overshoot is large.

Method used

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  • Bidirectional full-bridge dc-dc converter control method and device based on phase shift angle slope feedforward
  • Bidirectional full-bridge dc-dc converter control method and device based on phase shift angle slope feedforward
  • Bidirectional full-bridge dc-dc converter control method and device based on phase shift angle slope feedforward

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] An embodiment of a control method for a bidirectional full-bridge DC-DC converter based on phase-shift angle slope feedforward:

[0030] figure 1 The main circuit topology of the bidirectional full-bridge DC-DC converter (DAB) is given by figure 1 As shown, DAB is composed of H-bridge M1, H-bridge M2 and a high-frequency transformer with a transformation ratio of n, wherein H-bridge M1 is composed of switch tube S 1 , S 2 , S 3 and S 4 Composed of, the H-bridge M2 consists of a switch S' 1 , S' 2 , S' 3 and S' 4 composition, the input voltage of DAB is U i , when the connected load is R L When, the output voltage of DAB is U o , the output current is i o . Neglecting the excitation current of the high-frequency transformer, its equivalent circuit is as figure 2 As shown, among them, u ab is the output voltage of H-bridg...

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Abstract

The invention relates to a phase-shift angle slope feedforward-based bidirectional full-bridge DC-DC converter control method and device. The control method comprises the steps of obtaining a current phase-shift angle phi0 and calculating a phase-shift angle steady-state value phi of a full-bridge DC-DC converter; if the current phase-shift angle phi0 does not reach the phase-shift angle steady-state value phi, determining a phase-shift angle increment deltaphi1 of the full-bridge DC-DC converter within each period by employing the phase-shift angle steady-state value phi as the target; and superposing a phase-shift angle feedforward quantity ideltaphi1 on a phase-shift angle control instruction in the ith period of the N periods. The phase-shift angle feedforward control is added in the control process of the phase-shift angle; active power transmission in the dynamic process is accelerated; fluctuation of DC bus voltage of an output side of the full-bridge DC-DC converter is reduced; overshoot of DC is reduced; and the dynamic characteristics of the full-bridge DC-DC converter are improved.

Description

technical field [0001] The invention relates to a bidirectional full-bridge DC-DC converter control method and device based on phase-shift angle ramp feedforward, and belongs to the technical field of power electronics. Background technique [0002] The bidirectional full-bridge DC-DC converter (DAB) has the advantages of high power density, electrical isolation of the system, and soft switching without additional passive components. It is used in new energy generation, power electronic transformers, energy storage devices, etc. Both have many applications. [0003] At present, the commonly used control strategy of DAB is direction shifting control. By making a difference between the DC bus voltage on the detection output side and the given voltage command, the difference is used as the input of the PI controller, and the phase shift angle is obtained through the adjustment of the PI controller. However, in the process of sudden loading and unloading, due to the poor dynami...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/3353
Inventor 冯宇鹏吴金龙王先为牛化鹏焦国帅刘欣和王少波
Owner XUJI GRP
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