Flexible transformer-substation-system direct current line protection method and apparatus thereof

A technology for DC lines and substations, used in emergency protection circuit devices, electrical components, etc., can solve the problems of lack of rapidity and large amount of calculation, and achieve the effect of improving rapidity, improving reliability, and overcoming the inability to act quickly.

Active Publication Date: 2017-08-25
STATE GRID CORP OF CHINA +3
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of large amount of calculation and lack of rapidity, the purpose of the present invention is to provide a DC line protection method and device for a flexible substation system. The method is not affected by factors such as fault type and line length, and can quickly identify faults and act effectively

Method used

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  • Flexible transformer-substation-system direct current line protection method and apparatus thereof
  • Flexible transformer-substation-system direct current line protection method and apparatus thereof
  • Flexible transformer-substation-system direct current line protection method and apparatus thereof

Examples

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Embodiment

[0058] Example: such as image 3 As shown, for the DC±10kV line between the flexible substation and the centralized photovoltaic, when a metal fault between poles occurs at the end of the line (that is, the centralized photovoltaic side), the fault component of the current flowing through the protection installation position and its rising rate are as follows: Figure 4 , Figure 5 shown.

[0059] According to the system parameters of the actual project at the moment t=0ms when the fault occurs, there are:

[0060]

[0061] from Figure 5 It can be seen from the figure that after a fault occurs, the current rising rate will drop rapidly. Therefore, in order to ensure the reliability and sensitivity of the current mutation protection action, usually, the initial threshold E of the current rising rate is set as the initial current in the case of a fault 0.5 times the growth rate. In order to make the protection operate as soon as possible and minimize the threat of fault ...

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Abstract

The invention relates to a flexible transformer-substation-system direct current line protection method and an apparatus thereof. The method comprises the following steps of 1) based on a fault loop of a direct current fault condition, deriving a fault-current mathematical expression and then acquiring a fault current; and 2) according to electric appliance component stress and protection demands under a direct current line fault condition, determining a high speed current sudden change protection setting principle and completing flexible transformer-substation-system direct current line protection. In the invention, the method and the apparatus are not influenced by a fault type, a line length and other factors, quick-action performance of protection motion after a direct current line fault is increased, and simultaneously operation reliability of a whole system is improved. The method and the apparatus can be widely applied to the direct current power distribution network protection technology field.

Description

technical field [0001] The invention relates to the technical field of DC distribution network protection, in particular to a DC line protection method and device for a flexible substation system. Background technique [0002] With the rapid development of distributed power generation devices and power electronics technology, the future development direction of smart grid is mainly concentrated in distribution network. In particular, the DC distribution network has attracted extensive attention from domestic and foreign projects for its characteristics of effectively accepting distributed power sources, efficient and stable voltage conversion and control, optimized system configuration, high power quality, strong power supply reliability, and good economy. In order to realize the wide and efficient application of the DC distribution network, the fault characteristics and protection configuration of the DC distribution system are the core key technologies to realize the safe ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/268
Inventor 刘颖贾科张祥龙李晨曦肖智宏陈炜
Owner STATE GRID CORP OF CHINA
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