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A large-capacity DC energy storage device with a DC dvr

A DC energy storage and large-capacity technology, applied in the field of power energy storage and DC conversion, can solve the problems of difficult selection of switching devices, difficulty in taking into account the performance and volume of converters, etc., and achieve the effect of reducing power, reducing power, and ensuring power density

Inactive Publication Date: 2021-01-05
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the method of installing a DC converter in the front stage is generally used for busbar voltage stabilization control, but large-capacity applications make it very difficult to select key components in the DC converter, such as inductors and switching devices, and it is difficult to take into account the converter. The contradiction between performance and volume and weight

Method used

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  • A large-capacity DC energy storage device with a DC dvr
  • A large-capacity DC energy storage device with a DC dvr
  • A large-capacity DC energy storage device with a DC dvr

Examples

Experimental program
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Effect test

Embodiment 1

[0038] This embodiment proposes a large-capacity DC energy storage device with a DC DVR, such as figure 1 As shown, the device includes a main energy storage module 1, a DVR compensator 2, a compensation energy storage module 3, a freewheeling diode 4, a filter capacitor 5, an energy storage management system 1 6, an energy storage management system 2 7, a charging Device one 8, charging device two 9, control unit 10, DC voltage sampling unit 11, DC current sampling unit 12 and isolation drive unit 13; the main energy storage module 1 is connected in series with the DVR compensator 2; the DVR compensator 2 is connected in parallel with the freewheeling diode 4; the charging terminals of the main energy storage module 1 and the compensation energy storage module 3 are respectively connected to the power supply terminals of the first charging device 8 and the second charging device 9; the main energy storage module 1 and the operation index control terminal of the compensating e...

Embodiment 2

[0041] This embodiment proposes a large-capacity DC energy storage device with a DC DVR. The device includes a main energy storage module 1, a DVR compensator 2, a compensation energy storage module 3, a freewheeling diode 4, a filter capacitor 5, a Energy management system one 6, energy storage management system two 7, charging device one 8, charging device two 9, control unit 10, DC voltage sampling unit 11, DC current sampling unit 12 and isolation drive unit 13. The DVR compensator 2 is implemented by a DCDC converter, including common forms such as Buck, Boost, and Buck-Boost. In this embodiment, the main circuit of the large-capacity DC energy storage device with a DC DVR has four forms, such as figure 2 shown.

[0042] The Buck circuit is composed of a switch tube, a freewheeling diode, a filter inductor, and a filter capacitor. Common switching devices include IGBTs and power MOSFETs. Although the MOSFET conduction voltage drop is low and the switching frequency is h...

Embodiment 3

[0044] This embodiment proposes a large-capacity DC energy storage device with a DC DVR. The device includes a main energy storage module 1, a DVR compensator 2, a compensation energy storage module 3, a freewheeling diode 4, a filter capacitor 5, a Energy management system one 6, energy storage management system two 7, charging device one 8, charging device two 9, control unit 10, DC voltage sampling unit 11, DC current sampling unit 12 and isolation drive unit 13. The main energy storage module and the compensation energy storage module 3 use lithium battery cells or supercapacitor modules as basic energy storage units; the lithium battery cells or supercapacitor modules are connected in series or in parallel to form the main For the energy storage module and the compensation energy storage module 3, if the energy storage unit is a lithium battery, the energy storage management system is a battery management system, and if the energy storage unit is a super capacitor, then th...

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Abstract

The invention provides a large-capacity DC energy storage device with a DC DVR, belonging to the technical field of electric power energy storage and direct current conversion. A lithium battery or asupercapacitor is used as an energy storage unit; by combining a main energy storage module and a compensating energy storage module, when DC bus voltage drop below the reference value, through the function of the DC DVR, the energy stored in the compensated energy storage module is output as the DC voltage to meet the system requirements, which is used to compensate the internal resistance of themain energy storage module, the line impedance and the voltage sag caused by the energy release to the load side, maintain the bus voltage stable at the reference value, and continuously supply powerto the load side.

Description

technical field [0001] The invention relates to a large-capacity DC energy storage device with a DC DVR, belonging to the technical fields of electric energy storage and DC conversion. Background technique [0002] Lithium-ion batteries generally use lithium metal oxides, such as lithium iron oxide, lithium manganate, ternary, etc., as the positive electrode material, and graphite as the negative electrode material. Lithium batteries are currently widely used in hydraulic, thermal, wind and solar energy storage systems, uninterruptible power supplies for communication equipment, electric tools, electric vehicles, military equipment, aerospace and many other military and civilian fields. It has the following advantages: small size, light weight, high energy density, which can reach 460 to 600Wh / Kg; long service life, generally can reach more than 6 years; high rated voltage, single voltage 3.2V or 3.7V, equivalent to 3 Only Ni-MH batteries are connected in series; with high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/14H02J3/32
CPCH02J1/14H02J3/32
Inventor 赵克段建东孙力国海峰安群涛吴凤江段明航陈晔
Owner HARBIN INST OF TECH
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