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Directional pilot protection method for power distribution network containing distributed generation

A technology of distributed power supply and longitudinal protection, applied in emergency protection circuit devices, electrical components and other directions, can solve problems such as complex methods and difficult implementation, and achieve the effect of overcoming complex methods, solving insufficient sensitivity, and being easy to implement.

Inactive Publication Date: 2014-05-21
STATE GRID CORP OF CHINA +3
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  • Abstract
  • Description
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Problems solved by technology

Although the above protection methods can realize the protection of distribution networks with distributed power sources, they generally have defects such as complicated methods and difficult implementation.

Method used

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  • Directional pilot protection method for power distribution network containing distributed generation
  • Directional pilot protection method for power distribution network containing distributed generation
  • Directional pilot protection method for power distribution network containing distributed generation

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Effect test

Embodiment Construction

[0030] The present invention contains the directional longitudinal protection method of distributed power distribution network, such as Figure 12 shown, including the following steps:

[0031] Step 1: Set up voltage transformers at the substation bus and distributed power grid connection points, and adopt directional longitudinal protection based on fault components on the lines between power sources. The lines between the power sources refer to the system power supply and distributed power grid connection points feeder lines between;

[0032] Step 2: Take whether the current mutation of three consecutive points detected by the protection exceeds the limit as the fault starting condition, if the limit is exceeded, the protection starts, and then the fault component voltage and fault component current are extracted;

[0033] Step 3: Use the fault component voltage and fault component current to construct an energy function, and judge the fault direction according to the chara...

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Abstract

The invention relates to the technical field of power distribution network protection, and in particular to a directional pilot protection method for a power distribution network containing a distributed generation (DG). The method comprises the following steps of: installing PTs on a transformer substation bus and a DG grid-connected point, and carrying out fault component-based directional pilot protection on a feeder line between power supplies; accurately judging a fault direction by virtue of the extracted fault component voltage and current construction energy function to realize protection on the upstream area of the DG; setting overcurrent protection on the downstream area of the DG grid-connected point and the adjacent feeder line, and configuring a corresponding forward acceleration or backward acceleration reclosure. The method is capable of protecting the power distribution network containing the distributed generation, simple, easy to realize, and good in use effect.

Description

technical field [0001] The invention relates to the technical field of distribution network protection, in particular to a directional longitudinal protection method for a distribution network containing distributed power sources. Background technique [0002] The high-penetration distributed generation (DG) access to the power distribution system has changed the network structure of the traditional radial distribution network, resulting in the phenomenon of refusal, malfunction or reduced sensitivity of the traditional three-stage current protection, which cannot meet the new requirements. Distribution network protection requirements. The access of distributed power to the power distribution system will change the original single-power radiation network into a double-terminal or multi-terminal active network, making the operation, protection and control of the distribution network more complicated, and the operation control of the original power distribution system And pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/28
Inventor 唐志军邓超平陈金祥林国栋邹贵彬仝冰冰
Owner STATE GRID CORP OF CHINA
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