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A Dynamic Voltage Restorer for DC System Based on Energy Storage

A dynamic voltage recovery, DC system technology, applied in the field of DC distribution network and energy storage, can solve the problem that the DC system cannot solve the voltage sag and other problems, and achieve the effect of voltage recovery to normal, fast charging and discharging speed, and ensuring stability

Active Publication Date: 2021-06-04
XJ ELECTRIC +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a DC system dynamic voltage restorer based on energy storage, which is used to solve the problem that the voltage sag cannot be solved in the existing DC system

Method used

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  • A Dynamic Voltage Restorer for DC System Based on Energy Storage
  • A Dynamic Voltage Restorer for DC System Based on Energy Storage
  • A Dynamic Voltage Restorer for DC System Based on Energy Storage

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Embodiment Construction

[0031] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0032] Aiming at the actual demand of the DC distribution network and the voltage drop problem existing in the DC distribution network, the present invention proposes a dynamic voltage restorer for the DC system based on energy storage, including a voltage compensation circuit, a charging circuit and an energy storage module, and also includes Control circuit. Among them, the voltage compensation circuit and the charging circuit are respectively provided with a high-voltage port and a low-voltage port. The high-voltage port of the voltage compensation circuit is used to connect to the DC bus in series, and the low-voltage port of the voltage compensation circuit is connected to the energy storage module; the high-voltage port of the charging circuit is used for parallel connection. To the DC bus, the low-voltage port of the charging circuit ...

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Abstract

The invention relates to a dynamic voltage restorer for a DC system based on energy storage, which is suitable for a DC distribution network system, and realizes the DC system through a charging circuit connected in parallel on the DC bus and a voltage compensation circuit connected in series on the DC bus. voltage compensation. That is, when there is no voltage drop on the DC bus, the charging circuit is used to charge the energy storage module. When the voltage drops on the DC bus, the energy storage module compensates the dropped voltage on the DC bus through the voltage compensation circuit, and quickly compensates the voltage to ensure the load Continuous and stable operation.

Description

technical field [0001] The invention belongs to the technical field of DC distribution network and energy storage, and in particular relates to a dynamic voltage restorer for a DC system based on energy storage. Background technique [0002] The DC distribution network is being used more and more. The reason is that the DC distribution network has the following advantages: 1) The DC distribution network has no reactive power compensation, harmonics and low-frequency oscillation problems, and the system operation is more stable; 2) The DC distribution network system has no phase difference, and it is easier to realize the interconnection of the two systems; 3) The DC distribution network is easier for the grid-connected operation of distributed generation. When most distributed power sources are connected to the AC distribution network, they need to go through the inverter link, but when they are connected to the DC distribution network, this link can be omitted to further im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/10
CPCH02J1/10
Inventor 徐军郭宝甫徐斌张妮张新坡
Owner XJ ELECTRIC
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