Contact line backup protection method suitable for double-petal-structured power distribution network
A backup protection and tie line technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of high protection configuration cost, high configuration cost, and large calculation amount, achieve good adaptability and economy, and reduce collection equipment Quantity, fast fault isolation effect
Pending Publication Date: 2022-01-04
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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[0004] The traditional directional current protection is generally installed in the tie line, and there is a time difference in the petal-shaped power grid, so that when the tie line close to the substation fails, it takes a long time to completely isolate the fault, and the current protection usually needs to be in the contact Install transformers and other measuring elements and power direction elements on both sides of the line, and the configuration cost is relatively high; in addition, the traditional distribution network protection methods are mostly based on the information of the protection itself, and the information utilization is limited, which has great limitations It is difficult to meet the requirements of complex distribution network protection and control
[0005] In the prior art, for example, CN112595930A patent of regional backup protection method of petal-type urban power grid with distributed power supply discloses a petal-type urban power grid based on the analysis of fault characteristics, and proposes a petal-type distributed power grid based on multi-source information. The regional backup protection method of the traditional urban power grid has problems such as complex protection logic and large amount of calculation.
Another example is CN201811054717.9, a petal-type power grid protection method suitable for distributed power access, which discloses a microcomputer protection method. This method can effectively locate the fault location of the grid node, but it needs to be installed at both ends of the tie line. Collection equipment, high cost of protection configuration
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[0046] The present invention will be described in further detail below in conjunction with the examples, but the scope of the present invention is not limited thereto, and the scope of protection is described in the claims.
[0047] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as any limitation of the application, its application or uses. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.
[0048]It should be noted that the terminology used here is only for describing sp...
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The invention relates to a tie line backup protection method suitable for a double-petal-structured power distribution network, and the method comprises the following steps: 1, obtaining line parameters of the double-petal-structured power distribution network; 2, judging a petal ring network where a fault is located; 3, determining a fault tie line; and 4, handling special conditions. Compared with traditional backup protection, the protection method has the advantages that the fault isolation speed is higher, the number of tie line acquisition equipment is reduced, and the protection method has good adaptability and economical efficiency and is suitable for popularization and application in the complex petal-shaped power distribution network.
Description
technical field [0001] The invention belongs to the field of relay protection in the field of electric power engineering, and in particular relates to a tie line backup protection method suitable for a double-petal structure distribution network. Background technique [0002] With the rapid increase of power load density in large and medium-sized cities, the pressure on power supply in cities is becoming increasingly prominent. The distribution network is directly connected to users, and its failure is the main factor affecting the quality and reliability of urban power grid power supply. In order to meet the requirements of users in urban high-density load areas for power supply reliability, various parts of my country are actively promoting the construction of high-reliability smart distribution networks, and construct double-loop operation in urban areas with high load density and high power supply reliability requirements. For the petal-shaped distribution network, its t...
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CPCH02H7/28
Inventor王献志李铁成郭少飞陈天英刘清泉张卫明李泽刘世岩王心蕊
OwnerSTATE GRID HEBEI ELECTRIC POWER RES INST