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Adaptive distance protection method based on virtual voltage drop

A technology of distance protection and virtual voltage, applied to emergency protection circuit devices, electrical components, etc., can solve problems such as protection failure, performance deterioration, and non-setting values, and achieve the effect of high resistance to transition resistance interference

Active Publication Date: 2016-05-18
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this harsh setting condition can ensure the correct operation of the protection, it also has obvious defects: the setting value of the protection is not the best setting value in other operating modes (including the main operating mode of the system); the most unfavorable short-circuit condition protection failure or serious deterioration of performance

Method used

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  • Adaptive distance protection method based on virtual voltage drop
  • Adaptive distance protection method based on virtual voltage drop
  • Adaptive distance protection method based on virtual voltage drop

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] figure 1 It is a system structure diagram of the application of the adaptive distance protection method based on virtual voltage drop in the present invention. Such as figure 1 As shown, the adaptive distance protection system based on virtual voltage drop provided by the present invention includes sequentially connected data reading module, protection calculation module and protection action module.

[0063] The data reading module is used to collect the voltage at the distance protection installation, the current at the distance protection installation, the angle between the measured zero-sequence current and the measurement current at the distance protection installation, the measured negative sequence current and the measurement current at the distance protection installation The included angle between them, the line impedance boundary value within the distance protection setting range and the line impedance angle within the distance protection setting range, and t...

Embodiment 2

[0152] Next, the correctness and rationality of the above-mentioned system and method are verified through the simulation process. Figure 7 It is a 500kV two-machine system, with Figure 7 The system shown serves as a simulated system.

[0153] According to the type of short-circuit fault and the influence of transition resistance, the simulation verification is divided into four parts:

[0154] Part 1: Fault judgment when a three-phase short circuit occurs in the system;

[0155] The second part: the fault judgment of metallic single-phase short circuit in the system and the fault judgment of single-phase short circuit affected by transition resistance in the system;

[0156] The third part: the fault judgment of metallic two-phase short circuit in the system and the fault judgment of two-phase short circuit affected by transition resistance in the system;

[0157] The fourth part: the fault judgment of metallic two-phase short-circuit and grounding in the system and the ...

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Abstract

The invention discloses a self-adaptive distance protection system based on virtual voltage drop and a protection method of the self-adaptive distance protection system in the technical field of relay protection of a power system. The self-adaptive distance protection system based on virtual voltage drop comprises a data reading module, a protection calculation module and a protection motion module which are connected in sequence. The protection method comprises the steps of collecting the voltage in a distance protection installation position, the current in the distance protection installation position, the included angle between the measurement zero sequence current and the measurement current in the distance protection installation position, the included angle between the measurement negative-sequence current and the measurement current in the distance protection installation position, and a circuit impedance boundary value and a circuit impedance angle in the distance protection setting range, calculating the measurement impedance and the self-adaptive distance protection setting impedance in the distance protection installation position according to the collected data, and determining whether a tripping signal or a blocking signal is sent according to the measurement impedance and the self-adaptive distance protection setting impedance in the distance protection installation position. The self-adaptive distance protection system based on virtual voltage drop and the protection method of the self-adaptive distance protection system achieve correct motions of protection and have high capacity of resisting to transition impedance interference.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, in particular to an adaptive distance protection method based on virtual voltage drop. Background technique [0002] The traditional protection uses the maximum operation mode to calculate the protection setting value, and the minimum operation mode to verify the protection sensitivity. Although this harsh setting condition can ensure the correct operation of the protection, it also has obvious defects: the setting value of the protection is not the best setting value in other operating modes (including the main operating mode of the system); the most unfavorable short-circuit condition In this case, the protection fails or the performance deteriorates seriously. In addition, with the access of distributed power sources, the operation mode of the power grid becomes more flexible, and the contradiction between the selectivity, sensitivity and reliability of protecti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 马静王卓朱祥胜丁秀香王增平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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