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Single-phase disconnection protection method based on current change rate of distributed power supply

A technology of distributed power supply and current change rate, which is applied in the direction of change rate measurement, power supply test, emergency protection circuit device, etc. problems, ease of implementation, effect of improving applicability

Active Publication Date: 2020-06-19
GUIZHOU POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art that cannot accurately identify single-phase disconnection faults in distribution networks containing distributed power sources, thereby providing a single-phase disconnection fault based on the current change rate of distributed power sources line protection method

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  • Single-phase disconnection protection method based on current change rate of distributed power supply
  • Single-phase disconnection protection method based on current change rate of distributed power supply
  • Single-phase disconnection protection method based on current change rate of distributed power supply

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Embodiment 1

[0041] This embodiment provides a single-phase disconnection protection method based on the current change rate of the distributed power supply, and the method flow chart is as follows figure 1 As shown, including collecting the power value and current value of the distributed power supply on the feeder at a certain moment; comparing the power value and current value of the distributed power supply at different moments, when the power value does not change and the current value is not equal, Calculate the critical power and current change rate of the distributed power supply; compare the current change rate and the disconnection protection action value to judge whether there is a fault between the distributed power supply and the bus on the feeder; determine the location of the fault point according to the location of the distributed power supply.

[0042] In this embodiment, the current change rate of the distributed power supply is used to determine the protection action valu...

Embodiment 2

[0064] This embodiment provides a single-phase disconnection protection method based on the current change rate of the distributed power supply, and its step flow chart is as follows figure 2 shown, including the following steps:

[0065] S101. Collect the power of the k-th distributed power supply on the i-th feeder at time t and its current Collect the load impedance Z on the i-th feeder i,L , where i=1,2...m, k=1,2...n i , m is the number of feeders, n i is the number of distributed power generation on the i-th feeder;

[0066] S102, comparing the power of the distributed power supply at time t-1 and time t and , compare the current of distributed power generation at time t-1 and time t and the size of and , execute S103, otherwise, execute S101;

[0067] S103. Calculate the critical power of the kth distributed power supply on the i-th feeder Execute step S104;

[0068] S104, compare Critical Power with Distributed Power the size of , execute S...

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Abstract

The invention provides a single-phase disconnection protection method based on the current change rate of a distributed power supply. The method comprises the steps: collecting the power value and current value of the distributed power supply on a feeder line at a certain moment; comparing the power values and the current values of the distributed power supply at different moments, and calculatingthe critical power and the current change rate of the distributed power supply when the power values are not changed and the current values are not equal; comparing the current change rate with a disconnection protection action value, and judging whether a fault occurs between the distributed power supply on the feeder line and a bus or not; and determining a fault point position according to theposition of the distributed power supply. The method is simple in principle, convenient in setting calculation, easy to realize, capable of accurately determining the single-phase disconnection fault, free from the influence of the length and the number of the feeder lines, and relatively high in selectivity, sensitivity and reliability.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a single-phase disconnection protection method based on the current change rate of a distributed power supply. Background technique [0002] In recent years, the research on single-phase short-circuit in medium-voltage distribution network has gradually increased, and the research on single-phase short-circuit fault characteristics and protection methods under different neutral point connection methods has attracted extensive attention. However, due to its inconspicuous characteristics of single-phase disconnection and non-ground fault, there are few researches on fault characteristics and protection. However, a single-phase disconnection will cause the load to operate without a phase, resulting in overvoltage and burning of the rotating motor. Especially if the single-phase disconnection takes too long to deal with, it will easily lead to the occur...

Claims

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Application Information

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IPC IPC(8): H02H7/26G01R19/12G01R31/54G01R31/08G01R31/40
CPCG01R19/12G01R31/086G01R31/40H02H7/262H02H7/263
Inventor 杜雪龙晓轩刘兵欧阳金鑫张盛安李华鹏杨忠付滨刘俊鑫王承政黄明王钟玉黄杰东廖燕盛兴隆龙航肖扬
Owner GUIZHOU POWER GRID CO LTD
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