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Distribution network fault location method and system with high permeability distributed power source

A technology for distributed power and distribution network faults, applied in fault locations, information technology support systems, and fault detection by conductor type, etc. into the distribution network, affecting the reliability of the power system, etc.

Active Publication Date: 2019-10-22
ANHUI ELECTRIC POWER FUYANG POWER SUPPLY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The main purpose of the present invention is to propose a distribution network fault location method and system containing high-permeability distributed power sources, aiming at solving the problem that existing fault location methods cannot be applied to high-permeability distributed power sources connected to distribution networks The situation may cause misjudgment and misjudgment, which seriously affects the reliability of the power system.

Method used

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  • Distribution network fault location method and system with high permeability distributed power source
  • Distribution network fault location method and system with high permeability distributed power source
  • Distribution network fault location method and system with high permeability distributed power source

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Embodiment 1

[0069] In order to achieve the above purpose, in the figure 2 In the distribution network system shown, the Thevenin equivalent of the system power supply and the distributed power supply is the equivalent impedance of the ideal power supply in series, where the total number of power supplies is m, denoted as S1, S2, ... Sm, and the total number of buses is n, Denoted as B(1), B(2),...B(n), busbar to power supply are denoted as BS(1), BS(2),...BS(m); S is the system power supply, DG is the distributed power supply. Suppose the fault occurs between B(6)-B(7), such as image 3 As shown, when a fault occurs, the system power supply and distributed power grid-connected point will detect a sudden change in voltage and current, and the program will start. The overall flow chart is as follows figure 1 Shown:

[0070] It should be noted that, in this embodiment, distributed power sources are normalized, and a model suitable for various types of distributed power sources is establis...

Embodiment 2

[0114] For this purpose, see Figure 8 : The present embodiment also discloses a distribution network fault location system containing a high-penetration distributed power supply, and the system includes the following modules:

[0115] Acquisition current and voltage module: used to collect current and voltage information before and after the fault;

[0116] Build the busbar impedance matrix module: perform the Thevenin equivalent of the distributed power supply, calculate the positive sequence, negative sequence, and zero sequence Thevenin equivalent impedances, and then establish the busbar impedance matrix;

[0117] Identify fault interval module: identify fault intervals by constructing fault indicators;

[0118] Fault location module: locate the fault point by constructing a virtual bus.

[0119] In this embodiment, the distributed power supply is normalized, and a model suitable for various types of distributed power supply is established, which ensures that the establ...

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Abstract

The invention discloses a distribution network fault location method and system with a high permeability distributed power source. The method comprises the following steps that: S1: when a distribution network with a high permeability distributed power grid fails to work, a power grid power detection point and a distributed power supply grid-connected point detect sudden changes and collect A-phase, B-phase and C-phase currents and voltages of a current transformer and a voltage transformer at the power grid power detection point and the distributed power supply grid-connected point; S2, Thevenin equivalent processing is performed on a distributed power supply, positive-sequence, negative-sequence, zero-sequence Thevenin equivalent impedances of the distributed power supply are calculated,and thus a bus impedance matrix is established; S3, a fault indicator is constructed to identify a fault interval; and S4, a virtual bus positioning fault point is constructed. According to the invention, the distributed power supply is normalized and a model adapting to various power supplies is established; and the established bus impedance matrix is independent of the distributed power supplytype.

Description

technical field [0001] The invention relates to the technical field of distribution network fault location, in particular to a method and system for fault location of a distribution network containing distributed power sources with high penetration rate. Background technique [0002] As fossil fuel reserves are depleted and global energy demand continues to grow, the prominence of renewable energy continues to rise. Distributed power generation improves the efficiency of clean energy utilization and solves the problem of power supply in remote rural areas through renewable energy such as wind power and solar energy. It has become one of the important measures for countries around the world to promote energy conservation and emission reduction and address climate change. However, the access of distributed power to the distribution network will change the original single power supply and radial structure characteristics of the power grid, making the distribution network a netw...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088Y04S10/52
Inventor 崔超奇朱杰刘斌程亚航董苏朱新菊郭运泽王化山郭碧翔韦杰杰张振洋何宇鑫徐虎卢家奎张剑东
Owner ANHUI ELECTRIC POWER FUYANG POWER SUPPLY
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