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Power grid distance protection method and device based on power supply composition proportion on-line identification

A technology for distance protection and protection installation, which is used in emergency protection circuit devices, emergency protection data processing devices, circuit devices, etc., and can solve the problems of inability to accurately remove faults, threats to safe operation of power grids, and reduction of fault currents.

Active Publication Date: 2022-04-26
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in order to ensure that the internal power electronic devices are not damaged, the inverter power supply will limit the output, which will greatly reduce the fault current in the line, and the fault information will not be obvious. It is difficult for existing protection devices to directly obtain fault location information. , so that it is impossible to act accurately to remove the fault
It can be seen that as the proportion of inverter power in hybrid power continues to increase, and it has greater volatility, traditional distance protection cannot continue to be applicable, posing a great threat to the safe operation of the power grid

Method used

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  • Power grid distance protection method and device based on power supply composition proportion on-line identification
  • Power grid distance protection method and device based on power supply composition proportion on-line identification
  • Power grid distance protection method and device based on power supply composition proportion on-line identification

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Effect test

Embodiment 1

[0072] This embodiment provides a power grid distance protection method based on online identification of power source composition ratio. This method is aimed at the power system with mixed power supply (including inverter power supply and traditional rotating electrical machine), and can obtain the corresponding power source composition ratio information (that is, the capacity ratio of inverter power supply and traditional rotating electrical machine) before the fault occurs. When the power line fails, the ratio will not change, so the protection device can calculate the distance from the fault point to the protection installation according to the ratio information and the measured current / voltage information, so that the improved distance protection can operate accurately. In essence, this method is also an adaptive protection method (tracking the change of the proportion of the power supply).

[0073] A power grid distance protection method based on online pre-identified po...

Embodiment 2

[0145] This embodiment provides a power grid distance protection device based on online identification of power supply composition ratio, including:

[0146] Identification module: used to identify and obtain the proportion of the power supply, the proportion of the power supply is the respective proportion of the traditional rotating motor and the inverter power supply at the end side of the grid power supply;

[0147] Monitoring module: used for real-time monitoring and obtaining circuit information;

[0148] The first judging module: used to judge whether there is a fault point according to the circuit information obtained by monitoring, if there is a fault point, start the protection, jump to the distance module, otherwise, jump to the identification module;

[0149] Distance module: used to process circuit information according to the proportion of the power supply, and obtain the distance from the corresponding fault point to the generator bus;

[0150] The second judgm...

Embodiment 3

[0154] This embodiment provides a power grid distance protection device based on online identification of the proportion of power supply, including a processor and a storage medium;

[0155] The storage medium is used to store instructions;

[0156] The processor is configured to operate according to the instructions to execute the steps of the method in the first embodiment.

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Abstract

The invention discloses a power grid distance protection method and device based on power supply composition proportion on-line identification. The method comprises two specific schemes including a removal method and a replacement method. According to the method, the line short-circuit fault occurring in the power grid containing a high-proportion inverter power supply can be effectively handled, so that after the fault occurs, the distance between the fault point and the protection installation position can be measured, the existing distance protection can be improved, the fault part can be selectively cut off, and the normal operation of the non-fault part can be ensured. Meanwhile, the protection method does not need to additionally install equipment, a traditional distance protection device can be completely utilized, certain self-adaptive capacity is achieved, and the construction and operation cost of an electric power system can be effectively reduced.

Description

technical field [0001] The invention relates to a power grid distance protection method and device based on on-line identification of power source composition ratio, belonging to the field of power system relay protection. Background technique [0002] At present, human society is more and more dependent on electric energy, and the demand for electric energy on a global scale is constantly growing rapidly. At the same time, the pollution caused by the massive consumption of fossil energy and the damage to the ecological environment have become increasingly serious. Against this background, the promotion and use of renewable energy power generation has received widespread attention, and clean energy power generation such as wind energy, solar energy, and tidal energy has ushered in new opportunities for development. [0003] With the development of new energy and the proposal of "dual carbon" goals, the power sources in the existing power grid tend to be mixed with tradition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/28H02H1/00H02J3/00
CPCH02H7/28H02H1/0092H02J3/0012
Inventor 陈谦张政伟鞠平陈嘉雯王苏颖钱倍奇牛应灏李宗源
Owner HOHAI UNIV