DC microgrid branch linkage control system and method

A technology of linkage control system and DC microgrid, which is applied to emergency protection circuit devices, fault detection according to conductor type, electrical components, etc. Misjudgment and other problems occur, to achieve the effect of fast and accurate fault judgment

Active Publication Date: 2021-03-30
BEIJING ETECHWIN ELECTRIC
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  • Abstract
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  • Claims
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Problems solved by technology

For example, in the DC protection method, most of the prior art adopts the voltage and current threshold protection method, which cannot be accurately distinguished for different working conditions, and is prone to malfunction; in addition, the existing technology also uses the current and voltage slope method, which is Compared with the threshold method, this method improves the situation and reduces the misjudgment situation, but it is also prone to misjudgment for some high-speed load changes
In addition, these methods only deal with specific fault conditions, without considering the linkage control of the overall microgrid

Method used

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  • DC microgrid branch linkage control system and method
  • DC microgrid branch linkage control system and method
  • DC microgrid branch linkage control system and method

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Embodiment Construction

[0023] In order to enable those skilled in the art to better understand the present invention, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] The embodiments of the present invention propose a new DC fault detection method, control method and corresponding control system based on the actual application of the DC microgrid.

[0025] The advantage of the embodiments of the present invention is that the method of frequency measurement plus threshold method is adopted for a single fault point, thereby speeding up the fault discrimination speed and preparation rate, and at the same time, the central control system is used to carry out multi-branch intelligent control of the microgrid, thereby achieving maintenance The purpose of system stability.

[0026] In the DC microgrid branch linkage protection control system provided by the embodiment of the present invention, the branch linkage protecti...

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Abstract

The invention provides a DC microgrid branch linkage control system and method. The DC micro-grid branch linkage control system comprises a detection unit for performing real-time voltage detection and current detection on each branch connected to a DC micro-grid bus; a controller which is used for carrying out frequency analysis and threshold analysis on the detected voltage and current, judgingfaults occurring in the direct-current microgrid on the basis of the frequency analysis and the threshold analysis, and carrying out linkage control on a plurality of branches on the basis of the faults; and a branch linkage mechanism which is used for executing linkage protection on branches in the system under the control of the controller.

Description

technical field [0001] The present invention relates to the technical field of power electronics, in particular, the present invention relates to a direct current microgrid branch linkage protection control system and method. Background technique [0002] With the increase of photovoltaic power generation projects, a large number of applications of electric vehicle charging stations, and a large number of applications of lithium battery backup power stations, there are more and more applications of DC systems and DC micro-grids. However, DC protection requires faster and more reliable protection than AC protection. In fact, it is more difficult to realize. The DC microgrid has just emerged in recent years, and its protection theory and protection methods are not as complete and mature as the AC protection system. [0003] The DC microgrid has just emerged in recent years, so there are many deficiencies in control theory, specific implementation methods, and equipment. For ...

Claims

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Application Information

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IPC IPC(8): H02H7/26G01R31/08
CPCH02H7/268H02H7/263G01R31/086H02H7/26G01R31/08H02H7/22
Inventor 张广洁宋万广马小虎岳圣鹏
Owner BEIJING ETECHWIN ELECTRIC
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