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Method for determining fault direction of distribution network through utilizing polarities of current and voltage break variables

A technology of voltage mutation and distribution network failure, which is applied in the field of distribution network and can solve problems such as unsuitable components

Active Publication Date: 2019-06-18
郭润生
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for judging the fault direction of the distribution network by using the polarity of the current and voltage mutations, so as to solve the problem that the traditional directional elements in the current distribution network lines are not applicable

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  • Method for determining fault direction of distribution network through utilizing polarities of current and voltage break variables
  • Method for determining fault direction of distribution network through utilizing polarities of current and voltage break variables
  • Method for determining fault direction of distribution network through utilizing polarities of current and voltage break variables

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Embodiment Construction

[0018] Attached below Figure 1-2 The method of judging the fault direction of distribution network by using the polarity of current and voltage mutation is further explained:

[0019] The invention provides a method for judging the fault direction of a distribution network by using the polarity of the sudden change of current and voltage, so as to solve the problem that the traditional directional element is not applicable in the current distribution network line containing distributed new energy.

[0020] The present invention only uses single-end current and voltage fault data; calculates the current and voltage mutations before and after the fault, and judges the fault direction by comparing the polarities of the two. This method can identify the fault direction conveniently, comprehensively and reliably by analyzing the polarity of the current and voltage mutations before and after the fault, which is of great significance to the line protection of the distributed new ene...

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Abstract

The invention discloses a method for determining the fault direction of the distribution network through utilizing polarities of current and voltage break variables, belongs to the technical field ofthe power distribution network and aims to solve a problem that traditional directional components in the current distribution network line are not applicable. The method is characterized in that single-ended current and voltage fault data are obtained; the current and voltage break variables before and after a fault are calculated, and the fault direction is determined by comparing polarities ofthe two. The current and voltage break variables before and after the fault are utilized to construct a directional component utilizing the polarities of the current and voltage break variables, the directional component criterion is obtained by multiplying the voltage and current break variables measured at the directional component mounting position, the method can be applied to different faultpositions and different fault types, a large number of simulation calculations show that the fault direction can be reliably determined, effective support is provided for line protection action of thedistribution network, and the method is applicable to the technical field of the distribution network.

Description

technical field [0001] The invention belongs to the technical field of distribution network, in particular to a method for judging the fault direction of distribution network by using the polarity of current and voltage mutations Background technique [0002] With the rapid development of energy generation technology, more and more new energy sources are integrated into the grid in a centralized or distributed manner. Compared with wind farms that mostly adopt centralized grid-connection, photovoltaic power sources are more distributed into the grid. For distribution network lines with distributed photovoltaic power sources, traditional protection and directional elements are not adaptable. For example, the system impedance of photovoltaic power plants is unstable and fluctuates greatly, resulting in large fluctuations in the discrimination results of directional elements based on power frequency changes, and reliable discrimination cannot be achieved. Therefore, it is of ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 何彩红温盛元郭润生
Owner 郭润生