Power distribution network failure data self-synchronizing method based on instantaneous amplitude change

A technology of distribution network fault and instantaneous amplitude, applied in fault location, information technology support system, etc., can solve the problems of large detection error at fault time, slow start, poor self-synchronization effect, etc., to improve the accuracy and speed of time synchronization Fast, highly sensitive results

Active Publication Date: 2015-03-04
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0006] In order to solve the above problems, the present invention proposes a distribution network fault data self-synchronization method based on instantaneous amplitude changes. Self-synchronization of fault data based on the characteristics of instantaneous c

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  • Power distribution network failure data self-synchronizing method based on instantaneous amplitude change
  • Power distribution network failure data self-synchronizing method based on instantaneous amplitude change
  • Power distribution network failure data self-synchronizing method based on instantaneous amplitude change

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[0063] Example 1

[0064] Such as image 3 As shown, the specific steps for implementing the method for self-synchronization of distribution network fault data based on instantaneous amplitude changes are as follows:

[0065] Step 1: The logic program starts;

[0066] Step 2: Collect current sampling data of current transformer in real time, and extract the sampling data of ABC three-phase current at the same time;

[0067] Step 3: Calculate the instantaneous amplitude of current in real time using the product of sampled values ​​(two-point or three-point product of sampled values);

[0068] Step 4: Calculate the sudden change in current amplitude of one cycle forward;

[0069] Step 5: Determine the fault. If there are three consecutive current instantaneous integrated amplitude mutations that exceed the threshold, determine the existence of the fault;

[0070] Step 6: Fault processing, take the first point above the mutation threshold as the fault moment, and calculate the relevant feat...

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Abstract

The invention discloses a power distribution network failure data self-synchronizing method based on instantaneous amplitude change. According to the power distribution network failure data self-synchronizing method, the instantaneous amplitude of the failure current is calculated by use of the instantaneous sampled values of three-phase currents at the same moment, failure synchronization is realized according to the characteristic that the instantaneous amplitude of the currents after a failure changes suddenly, and whether the failure exists is determined according to whether the magnitude of the sudden change of two cycle current instantaneous amplitudes before and after the failure exceeds a certain threshold; the power distribution network failure data self-synchronizing method has the characteristics of high sensitivity and high speed, and is capable of effectively overcoming the defects of an existing fault detection method, such as slow start, high failure moment detection error and poor self-synchronizing effect in case of failures occurring near a current zero-crossing point; without increasing the construction cost, the clock synchronization accuracy is improved to meet the requirements of the line longitudinal differential protection of the power distribution network.

Description

technical field [0001] The invention belongs to the field of power system automation, and in particular relates to a self-synchronization method for distribution network fault data based on instantaneous amplitude changes. Background technique [0002] The increase in the reliability of power supply for important loads has promoted the application of closed-loop networks in distribution networks. On the other hand, the development of the active distribution network, especially the massive access of distributed power sources, has changed the characteristics of the single-radiation network structure of the traditional distribution network. Uncertainty causes the traditional three-stage current protection to malfunction or refuse to operate. The longitudinal current differential protection can effectively use the information in the fault zone, and is the most effective protection method. [0003] The emergence of the above problems has promoted the application of the longitud...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCY04S10/52
Inventor 牛进苍高厚磊李红梅赵宝光李尚振亓占华朱孟轩王晓军裴秀高许丹
Owner STATE GRID CORP OF CHINA
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