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Load feedforward control method of dual active bridge DC/DC converter

A control method and feedforward control technology, applied in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve problems such as increasing circuit cost and complexity, reducing dynamic response speed, and limitations

Active Publication Date: 2018-04-20
STATE GRID SHANDONG ELECTRIC POWER COMPANY WEIFANG POWER SUPPLY
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Problems solved by technology

However, a high-speed AD sampling circuit and a high-performance sensor are required to actually sample the output current, which increases the cost and complexity of the circuit, and the low-pass filter in the dual-loop control also limits the bandwidth of the current inner loop, reducing the dynamic response speed
[0003] In order to solve the above problems, the prior art proposes feedforward control based on load current, feedforward control based on output power, and feedforward control of power command, but none of these methods can effectively overcome the above two problems at the same time

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  • Load feedforward control method of dual active bridge DC/DC converter
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  • Load feedforward control method of dual active bridge DC/DC converter

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Embodiment Construction

[0031] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

[0032] It should be understood that the ordinal words first, second, etc. described in the specification are only for clarity of description, and are not intended to limit the order of elements, components or components, that is, described as the first element, component and component, and the second element , component or component may also be expressed as a second element, component and component as well as a first element, component or component.

[0033] figure 1 It is a topological structure diagram of a DAB converte...

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Abstract

The invention discloses a load feedforward control method of a dual active bridge DC / DC converter. The control method comprises the steps of controlling the dual active bridge DC / DC converter by a voltage controller in a phase shifting control mode after the dual active bridge DC / DC converter is started; starting a non-linear disturbance observer to estimate the load current of the dual active bridge DC / DC converter; enabling the estimated load current to be summed with the output of the voltage controller to obtain an output current reference value of the dual active bridge DC / DC converter; and calculating the output of a current controller based on the output current reference value of the dual active bridge DC / DC converter, and converting the output current reference value of the dual active bridge DC / DC converter into a phase shifting angle to be used as a control switch of a switch in the dual active bridge DC / DC converter.

Description

technical field [0001] The invention relates to a control method of a double full bridge DC / DC converter. More specifically, it relates to a load feed-forward control method of a double full-bridge DC / DC converter. Background technique [0002] In recent years, more and more studies have focused on the dual full bridge DC / DC (Dual Active Bridge, DAB) converter, and its two typical control strategies are single-loop control strategy and dual-loop control strategy. The double-loop control strategy can simultaneously adjust the DC bus voltage and the output current of the converter, and has better dynamic performance. However, a high-speed AD sampling circuit and a high-performance sensor are required to actually sample the output current, which increases the cost and complexity of the circuit, and the low-pass filter in the dual-loop control also limits the bandwidth of the current inner loop, reducing the dynamic response speed . [0003] In order to solve the above proble...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/33523H02M3/33576H02M1/0019
Inventor 吴俊勇郝亮亮刘自程熊飞
Owner STATE GRID SHANDONG ELECTRIC POWER COMPANY WEIFANG POWER SUPPLY
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