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A method and device for setting reclosing time of outgoing line of power plant considering multiple factors

A technology of reclosing time and reclosing, which is applied in the direction of circuit devices, emergency protection circuit devices, emergency protection devices with automatic disconnection, etc., to achieve the effect of ensuring power angle stability, avoiding reclosing failure, and ensuring power transmission capability

Active Publication Date: 2019-11-05
STATE GRID NINGXIA ELECTRIC POWER CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a method for setting the reclosing time of power plant outgoing lines considering multiple factors, solve the problem of optimal reclosing time setting of power plant outgoing lines, and improve the power angle stability of power plants when reclosing reclosing and permanent faults

Method used

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  • A method and device for setting reclosing time of outgoing line of power plant considering multiple factors
  • A method and device for setting reclosing time of outgoing line of power plant considering multiple factors
  • A method and device for setting reclosing time of outgoing line of power plant considering multiple factors

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Embodiment 1

[0036] This embodiment is a method for setting the power plant outlet reclosing time considering multiple factors, including:

[0037] Simulation calculation of the maximum latent power supply current when a single-phase fault occurs at the set position of the outgoing line of the power plant;

[0038] Calculate the time t for the submerged current to decay to 0 based on the maximum submerged current and the preset relationship between the magnitude of the submerged current and the attenuation 1 ;Define the optimal reclosing time under transient fault as t c1 = t 1 +Δt 1 , Δt 1 is the preset time safety margin;

[0039] Simulation calculation of the reclosing time t that has the least influence on the power angle of the generator when a single-phase fault occurs at the set position 2 ; Define the optimal reclosing time under permanent fault as t c2 = t 2 ;

[0040] Obtain all protections and their protection action time setting values ​​that cooperate with the fault re...

Embodiment 2

[0054] Based on Embodiment 1, this embodiment describes in detail the method for setting the reclosing time of the outgoing line of the power plant in consideration of multiple factors.

[0055] The specific implementation process of this embodiment refers to figure 1 Shown:

[0056] Taking the outgoing line of a power plant with a capacity of 2*660MW as an example, the length of the outgoing line of the power plant is 7.3 kilometers, and the maximum submerged supply current under a single-phase fault is calculated to be 4.34A. It takes about 0.36s for the supply current to decay to 0, considering the safety margin of 0.2s, and the reclosing time t when considering the sneak supply current c1 is 0.56s;

[0057] t=0.25(0.1I+1) (1)

[0058] refer to figure 2 After a single-phase fault occurs in the outgoing line of the power plant, the power angle curve of the generator after the faulty line is cut off after 0.1s is analyzed by using the equal area rule. Reclosing is the b...

Embodiment 3

[0064] This embodiment is a power plant outlet reclosing time setting device considering multiple factors, including:

[0065] The maximum submerged power supply current calculation module is used to simulate and calculate the maximum submerged power supply current when a single-phase fault occurs at the set position of the outgoing line of the power plant;

[0066] The optimal reclosing time calculation module considering transient faults is used to calculate the time t for the submerged current to decay to 0 based on the maximum submerged current and the preset submerged current size and attenuation relationship 1 ;Define the optimal reclosing time under transient fault as t c1 = t 1 +Δt 1 , Δt 1 is the preset time safety margin;

[0067] The optimal reclosing time calculation module considering permanent faults is used to simulate and calculate the reclosing time t that has the least influence on the power angle of the generator when a single-phase fault occurs at the s...

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Abstract

The invention discloses a method and a device for setting the reclosing time of the outgoing line of a power plant taking multiple factors into account. The optimal reclosing time of the outgoing lineof a power plant is determined by considering the attenuation of secondary arc current under a single-phase fault, the secondary impact of a reclosing action on generators under a permanent fault, the cooperation of reclosing and corresponding protection, and the like. The invention can provide technical support for the setting of the optimal reclosing time of the outgoing line of a power plant.The stability of the system is improved. The delivery capacity of a power plant is ensured.

Description

technical field [0001] The invention relates to the technical field of electric power systems and automation thereof, in particular to a method and device for setting reclosing time of outgoing lines of power plants in consideration of multiple factors. Background technique [0002] Most of the faults in the power system are transient faults, and automatic reclosing can improve the reliability of the system power supply. For permanent faults, the action of the reclosing device will cause a second impact on the power equipment. In order to avoid the harm of reclosing and permanent faults to equipment and systems, scholars have carried out research on adaptive reclosing theory. [0003] At present, the reclosing time setting mainly considers the following factors: the tripping time when the protections on both sides of the line are different, the arc extinguishing time at the fault point after the protection trips, the insulation recovery time at the fault point, the arc extin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/06H02H7/26
CPCH02H3/06H02H7/26
Inventor 摆世彬郜建良张红丽钟海亮项丽刘福锁李兆伟李威薛峰张倩王超罗峰郑梦秋
Owner STATE GRID NINGXIA ELECTRIC POWER CO