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Two-way buck-boost direct current (DC) converter applied to energy storage system

A DC converter and energy storage system technology, applied in the field of electrical devices, can solve the problems of limited voltage and capacity of battery packs, and unrestricted series and parallel connection of single batteries, so as to achieve wide application range, reduce impact and improve flexibility sexual effect

Inactive Publication Date: 2013-03-13
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, due to the limitation of battery cell grouping technology, single cells cannot be connected in series and parallel without limit, and the voltage and capacity of the battery pack are limited.

Method used

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  • Two-way buck-boost direct current (DC) converter applied to energy storage system
  • Two-way buck-boost direct current (DC) converter applied to energy storage system

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Embodiment Construction

[0026] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] The schematic diagram of the energy storage battery provided by the present invention is as follows: figure 1 As shown, the energy storage system includes a battery pack, a DC converter, an energy storage grid-connected inverter, and a power grid; the battery pack is composed of at least one battery; the battery is stored in a battery cabinet; multiple DC converters are used in parallel , each DC converter is connected to a battery cabinet, and then the output ends of the DC converters are connected in parallel to the DC bus inputted by the energy storage grid-connected inverter; the energy storage grid-connected inverter is connected to the grid.

[0028] The circuit topology of the bidirectional buck-boost DC converter applied to the energy storage system provided by the present invention is as follows: figure...

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Abstract

The invention relates to a two-way buck-boost DC converter applied to an energy storage system. The DC converter is characterized by being included in the energy storage system and comprising an input capacitor Ci, a filter inductor Lm, a transistor S1, a transistor S2 and an output capacitor C0, wherein the battery positive pole of the energy storage system is connected with the positive pole of the input capacitor Ci and one end of the filter inductor Lm, the other end of the filter inductor Lm is connected with the common point of the drain of the transistor S1 and the source of the transistor S2, the drain of the transistor S2 is connected with the positive pole of the output capacitor C0 and the input side positive pole of an energy storage grid-connected inverter, and the input side negative pole of the energy storage grid-connected inverter is connected with the negative pole of the output capacitor C0, the source of the transistor S1, the negative pole of the input capacitor Ci and the battery negative pole. The two-way buck-boost DC converter is provided with a power two-way function and a plurality of DC converters with the same model are connected in series for use during high capacity to satisfy the requirement of various grid systems for the power.

Description

technical field [0001] The invention relates to an electrical device of an energy storage system, in particular to a bidirectional buck-boost DC converter applied to the energy storage system. Background technique [0002] As an important distributed power source, the energy storage system plays an active role in power grid peak shaving and valley filling, new energy access, power quality improvement and emergency power supply. The converter realizes bidirectional energy transmission between the energy storage battery system and the back-stage inverter, and boosts the DC battery to provide a normal working and stable input voltage for the back-stage inverter. [0003] At present, due to the limitation of battery cell grouping technology, single cells cannot be connected in series and parallel without limit, and the voltage and capacity of the battery pack are limited. When the energy storage battery is used in the power grid system, the voltage of the battery pack needs to ...

Claims

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Application Information

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IPC IPC(8): H02M7/48H02J3/38H02J3/32
Inventor 周晨刘欢曹远志吴福保杨波陶以彬
Owner CHINA ELECTRIC POWER RES INST
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