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A method and device for identifying vulnerable areas of distribution network voltage

An identification method and technology of distribution network, applied in the direction of measuring current/voltage, measuring device, measuring resistance/reactance/impedance, etc., can solve the problems of large workload and low applicability in the load voltage sag domain, and avoid blindness. The effect of repetitive calculation work and good practicality

Active Publication Date: 2021-08-03
国网电力科学研究院武汉能效测评有限公司 +3
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AI Technical Summary

Problems solved by technology

The fault point method can be applied to radial distribution network and mesh distribution network at the same time, but this method needs to simulate a large number of fault points to ensure the accuracy of the load voltage sag domain solution, so the disadvantage of this method is that the load voltage sag The solution of the domain brings a huge workload, especially when the number of distribution network nodes increases, the applicability of this method is lower

Method used

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  • A method and device for identifying vulnerable areas of distribution network voltage
  • A method and device for identifying vulnerable areas of distribution network voltage
  • A method and device for identifying vulnerable areas of distribution network voltage

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Embodiment Construction

[0048] In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0049] The present invention provides a method for calculating a distribution network load voltage sag domain and a method for identifying a voltage vulnerable area. The method includes the following steps:

[0050] Step 1): Use the structure and parameters of the target distribution network to calculate the power flow, obtain the voltage information of each bus before the fault, and calculate the positive-sequence, negative-sequence and zero-sequence impedances of the target distribution network;

[0051] Step 2): Set short-circuit faults sequentially on the target distribution network bus, thereby obtaining the residual voltage on the sensitive load bus, and based on this, obtain the bus sag identification vector BSI and the line sag correlation vector LSI;

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Abstract

The invention relates to a method and device for identifying vulnerable areas of distribution network voltage, and proposes a busbar sag identification vector and a line voltage sag correlation vector to quickly determine which lines of the distribution network have critical points, and based on this, proposes a method for determining which lines have critical points. The number of critical points is used to obtain higher calculation efficiency; on the basis of accurately obtaining the sensitive load voltage sag domain, the concept of bus voltage sag influence degree and line voltage sag influence degree is proposed, and the distribution network fault is considered The vulnerable areas of the distribution network are identified based on multiple factors such as type distribution probability, line and bus failure probability, and sensitive load tolerance characteristics.

Description

technical field [0001] The present invention relates to the technical field of distribution network protection and control, and more specifically, to a method and device for identifying voltage vulnerable regions of a distribution network. Background technique [0002] As the most important power quality problem, voltage sag is the main factor that seriously affects the reliability of distribution network power supply, especially causing huge economic losses and waste of resources to modern park manufacturing enterprises. Statistics from the Lawrence Berkeley National Laboratory in the United States show that the economic losses caused by power interruptions to American power users are close to 80 billion U.S. dollars every year. The survey results of the EU Leonardo Power Quality Working Group show that the annual economic losses caused by voltage sags and power interruptions in the 25 EU member states are as high as 93 billion euros. Voltage sag has brought serious econom...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01R31/08G01R19/28G01R27/04
CPCG01R19/28G01R27/04G01R31/00G01R31/086G01R31/088
Inventor 郭松张明敏李勇胡文博颜毅余梦丁凯李伟胡畔
Owner 国网电力科学研究院武汉能效测评有限公司
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