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Control method of multi-mode bidirectional DC-DC converter of DC microgrid

A DC-DC, DC micro-grid technology, applied in the field of micro-grid, can solve the problems of voltage instability, large ripple, etc., and achieve the effect of fast response

Active Publication Date: 2020-02-07
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above problems, the present invention proposes a DC micro-grid multi-mode bidirectional DC-DC converter control method, which mainly solves the problems of large ripple and unstable voltage caused by using two modes of Boost and Buck to control the current direction

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[0024] In order to make the purpose, technical solution and advantages of the present invention more clear and definite, the content of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only parts related to the present invention are shown in the drawings but not all content.

[0025] according to figure 1 As shown, this embodiment proposes a DC microgrid multi-mode bidirectional DC-DC converter. The main circuit adopts a three-phase interleaved parallel Buck-Boost bidirectional topology. 1 , T 2 , T 3 , T 4 , T 5 , T 6 Composed of A, B, C three-phase, every two IGBT switch tubes are connected in series to form a bridge arm, and the three bridge arms are conne...

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Abstract

The invention discloses a control method of a multi-mode bidirectional DC-DC converter of a DC microgrid. The method comprises the following steps: obtaining the voltage of a DC bus in a three-phase interleaving parallel Buck-Boot main circuit; judging whether the voltage of the DC bus is equal to zero; when the voltage of the DC bus is equal to zero, controlling the converter to work in a voltagesource mode, and boosting a storage battery to establish the voltage of the DC bus; and when the voltage of the DC bus is not equal to zero, detecting a numerical value of the voltage of the DC bus,if the numerical value of the voltage of the DC bus is within a preset range, selecting a switch state according to the mode to work in a dispatching control mode or an automatic control mode: in thedispatching control mode, adjusting the charge and discharge current of an energy storage battery according to a signal output by an upper dispatching system, so that the voltage of the DC bus tends to be stable, and in the automatic control mode, automatically charging and discharging the storage battery according to the voltage of the DC bus. The control method disclosed by the invention has thebeneficial effects of ensuring that a microgrid system can run stably and reliably through the dispatching or automatic charge and discharge control of the storage battery.

Description

technical field [0001] The invention relates to the field of micro-grids, in particular to a control method for a multi-mode bidirectional DC-DC converter of a DC micro-grid. Background technique [0002] The DC microgrid is a microgrid composed of DC. The DC microgrid can be more efficiently connected to DC loads such as photovoltaic and other distributed power generation units, energy storage units, and electric vehicles. The DC microgrid adopts the public DC busbar as a distributed power supply access, and units such as photovoltaics and energy storage can be connected to the busbar only through the DC-DC module. Compared with the AC microgrid, the power generation unit has fewer DC-AC modules, and the power Transformation order reduction efficiency is improved. The DC microgrid is suitable for application in data centers, industrial parks, electric vehicle charging stations, etc., to form a light-storage-charging DC microgrid system. [0003] At present, in the microgr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10H02J1/14H02J7/34H02M3/158
CPCH02J1/102H02J1/14H02J7/34H02M3/1582H02M3/1586
Inventor 吴昌宏舒杰王浩宋香荣
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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